mBAF complex

A muscle cell-specific SWI/SNF-type complex that contains eight to fourteen proteins, including both conserved (core) and nonconserved components; contains the ATPase product of either the SMARCA4/BAF190A/BRG1 gene, the mammalian ortholog of the yeast SNF2 gene, or the SMARCA2/BAF190B/BRM gene, the mammalian ortholog of the Drosophila brm (brahma) gene, or an ortholog of either of these genes, and the muscle-specific product of the DPF3/BAF45C gene or an ortholog thereof.


Isw1 complex

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A protein complex that contains an Isw1 subunit from the ISWI-family of ATPases and acts to modify chromatin structure.


Ino80 complex

A multisubunit protein complex that contains the Ino80p ATPase; exhibits chromatin remodeling activity.


proton-transporting two-sector ATPase complex

A large protein complex that catalyzes the synthesis or hydrolysis of ATP by a rotational mechanism, coupled to the transport of protons across a membrane. The complex comprises a membrane sector (F0, V0, or A0) that carries out proton transport and a cytoplasmic compartment sector (F1, V1, or A1) that catalyzes ATP synthesis or hydrolysis. Two major types have been characterized: V-type ATPases couple ATP hydrolysis to the transport of protons across a concentration gradient, whereas F-type ATPases, also known as ATP synthases, normally run in the reverse direction to utilize energy from a proton concentration or electrochemical gradient to synthesize ATP. A third type, A-type ATPases have been found in archaea, and are closely related to eukaryotic V-type ATPases but are reversible.


Isw1b complex

An Isw1 complex that binds DNA and has nucleosome-stimulated ATPase activity. In S. cerevisiae, contains an Isw1p ATPase subunit in complex with Ioc2p and Ioc4p.


proton-transporting ATP synthase complex

A proton-transporting two-sector ATPase complex that catalyzes the phosphorylation of ADP to ATP during oxidative phosphorylation. The complex comprises a membrane sector (F0) that carries out proton transport and a cytoplasmic compartment sector (F1) that catalyzes ATP synthesis by a rotational mechanism; the extramembrane sector (containing 3 a and 3 b subunits) is connected via the d-subunit to the membrane sector by several smaller subunits. Within this complex, the g and e subunits and the 9-12 c subunits rotate by consecutive 120 degree angles and perform parts of ATP synthesis. This movement is driven by the hydrogen ion electrochemical potential gradient.


SHREC complex

A histone deacetylase complex that contains a core of four proteins -- Clr1, Clr2, Clr3, and Mit1 in fission yeast -- and localizes to all heterochromatic regions in the genome as well as some euchromatic sites. The complex is involved in regulating nucleosome positioning to assemble higher-order chromatin structures.


ACF complex

An ISWI complex that contains an ATPase subunit of the ISWI family (SNF2H in mammals, Isw2 in S. cerevisiae), an ACF1 homolog, and generally no other subunits, though Xenopus is an exception with a third non-conserved subunit. ACF plays roles in regulation of RNA polymerase II transcription and in DNA replication and repair.


mitochondrial proton-transporting ATP synthase complex

A proton-transporting ATP synthase complex found in the mitochondrial membrane.


archaeal proton-transporting A-type ATPase complex

A large proton-transporting two-sector ATPase protein complex that catalyzes the synthesis or hydrolysis of ATP by a rotational mechanism, coupled to the transport of protons across a membrane and is found in Archaea.


RSC-type complex

A SWI/SNF-type complex that contains a bromodomain containing-protein, such as yeast Rsc1 or Rsc4 or mammalian PB1/BAF180. The RSC complex is generally recruited to RNA polymerase III promoters and is specifically recruited to RNA polymerase II promoters by transcriptional activators and repressors; it is also involved in non-homologous end joining.


nBAF complex

A SWI/SNF-type complex that is found in post-mitotic neurons, and in human contains actin and proteins encoded by the ARID1A/BAF250A or ARID1B/BAF250B, SMARCD1/BAF60A, SMARCD3/BAF60C, SMARCA2/BRM/BAF190B, SMARCA4/BRG1/BAF190A, SMARCB1/BAF47, SMARCC1/BAF155, SMARCE1/BAF57, SMARCC2/BAF170, DPF1/BAF45B, DPF3/BAF45C, ACTL6B/BAF53B genes. The nBAF complex along with CREST plays a role regulating the activity of genes essential for dendrite growth.


Swr1 complex

A multisubunit protein complex that is involved in chromatin remodeling. It is required for the incorporation of the histone variant H2AZ into chromatin. In S. cerevisiae, the complex contains Swr1p, a Swi2/Snf2-related ATPase, and 12 additional subunits.


CERF complex

An ISWI complex that contains an ATPase subunit of the ISWI family (specifically SNF2L in mammals, which contain two ISWI homologs) and a CECR2 homolog. In mammals, CERF is involved in regulation of transcription from RNA polymerase II promoters.


proton-transporting V-type ATPase complex

A proton-transporting two-sector ATPase complex that couples ATP hydrolysis to the transport of protons across a concentration gradient. The resulting transmembrane electrochemical potential of H+ is used to drive a variety of (i) secondary active transport systems via H+-dependent symporters and antiporters and (ii) channel-mediated transport systems. The complex comprises a membrane sector (V0) that carries out proton transport and a cytoplasmic compartment sector (V1) that catalyzes ATP hydrolysis. V-type ATPases are found in the membranes of organelles such as vacuoles, endosomes, and lysosomes, and in the plasma membrane.


npBAF complex

A SWI/SNF-type complex that is found in neural stem or progenitor cells, and in human contains actin and proteins encoded by the ARID1A/BAF250A or ARID1B/BAF250B, SMARCD1/BAF60A, SMARCD3/BAF60C, SMARCA2/BRM/BAF190B, SMARCA4/BRG1/BAF190A, SMARCB1/BAF47, SMARCC1/BAF155, SMARCE1/BAF57, SMARCC2/BAF170, PHF10/BAF45A, ACTL6A/BAF53A genes. The npBAF complex is essential for the self-renewal/proliferative capacity of the multipotent neural stem cells.


plasma membrane proton-transporting V-type ATPase complex

A proton-transporting two-sector ATPase complex found in the plasma membrane.


esBAF complex

An embryonic stem cell-specific SWI/SNF-type complex that contains eight or nine proteins, including both conserved (core) and nonconserved components; contains the ATPase product of either the SMARCA4/BAF190A/BRG1 gene, the mammalian ortholog of the yeast SNF2 gene, or an ortholog thereof. Compared to many other BAF complexes never contains ACTL6B/BAF53B, ARID1B/BAF250B, SMARCA2/BRM, SMARCC2/BAF170 or SMARCD3/BAF60C but contains PHF10/BAF45A, DPF2/BAF45D and possibly one of BCL7A/B/C.


WICH complex

An ISWI complex that contains an ATPase subunit of the ISWI family (specifically SNF2H in mammals, which contain two ISWI homologs) and WSTF (Williams Syndrome Transcription Factor). WICH plays roles in regulation of RNAP I and III transcription and in DNA replication and repair.


plasma membrane proton-transporting ATP synthase complex

A proton-transporting ATP synthase complex found in the plasma membrane. Examples of this component are found in Bacterial species.


ESCRT IV complex

An ESCRT complex that has AAA-ATPase activity and is involved in ESCRT-mediated intralumenal vesicle formation and the final stages of cytokinesis. The complex catalyzes disassembly of the ESCRT III filament around the neck of the budding vesicle in an ATP-driven reaction, resulting in membrane scission and recycling of the ESCRT III components back to the cytosol. In yeast, it is formed by the AAA ATPase Vps4 and its cofactor Vta1.


ISWI-type complex

Any nuclear protein complex that contains an ATPase subunit of the imitation switch (ISWI) family. ISWI ATPases are involved in assembling chromatin and in sliding and spacing nucleosomes to regulate transcription of nuclear RNA polymerases I, II, and III and also DNA replication, recombination and repair.


GBAF complex

A SWI/SNF subcomplex that incorporates two mutually exclusive paralogs, GLTSCR1 (glioma tumor suppressor candidate region gene 1) or GLTSCR1L (GLTSCR1-like), BRD9 (bromodomain-containing 9) and the BAF subunits BAF155, BAF60, SS18, BAF53a, and BRG1/BRM.


chloroplast proton-transporting ATP synthase complex

A proton-transporting ATP synthase complex found in the chloroplast thylakoid membrane; it catalyzes the phosphorylation of ADP to ATP during photo-phosphorylation.


NURF complex

An ISWI complex that contains an ATPase subunit of the ISWI family (SNF2L in mammals), a NURF301 homolog (BPTF in humans), and additional subunits, though the composition of these additional subunits varies slightly with species. NURF is involved in regulation of transcription from TRNA polymerase II promoters.


CHD-type complex

A SWI/SNF-type complex that contains a subunit from the CHD(Chromodomain helicase DNA-binding) family. The CHD family is characterized by two signature sequence motifs: tandem chromodomains located in the N-terminal region, and the SNF2-like ATPase domain located in the central region of the protein structure.


NuRD complex

An approximately 2 MDa multi-subunit complex that exhibits ATP-dependent chromatin remodeling activity in addition to histone deacetylase (HDAC) activity, and has been shown to establish transcriptional repression of a number of target genes in vertebrates, invertebrates and fungi. Amongst its subunits, the NuRD complex contains histone deacetylases, histone binding proteins and Mi-2-like proteins.


CHRAC

An ISWI complex that contains an ATPase subunit of the ISWI family (SNF2H in mammals, Isw2 in S. cerevisiae), an ACF1 homolog, and additional small histone fold subunits (generally two of these, but Xenopus has only one and some additional non-conserved subunits). CHRAC plays roles in the regulation of RNA polymerase II transcription and in DNA replication and repair.


INO80-type complex

A chromatin remodeling protein complex initially purified from S. cerevisiae and containing more than 10 subunits, including the SWR1-related complexes. INO80 (inositol requiring 80)-type complexes have diverse functions, including promoting transcriptional activation and DNA repair.


enhanceosome

A protein-DNA complex formed by the association of a distinct set of general and specific transcription factors with a region of enhancer DNA. The cooperative assembly of an enhanceosome confers specificity of transcriptional regulation.


Cdc42 GTPase complex

A protein complex formed by the association of the small GTPase Cdc42 with additional proteins. In Schizosaccharomyces the complex contains the Cdc42, Ras1, Scd1, Scd2, andShk1 proteins, and functions in the Ras1-Scd GTPase signaling pathway.


Derlin-1 retrotranslocation complex

A protein complex that functions in the retrotranslocation step of ERAD (ER-associated protein degradation), and includes at its core Derlin-1 oligomers forming a retrotranslocation channel.


virus tail, sheath

The external contractile envelope of the tail of some viruses. Its contraction ensures ejection of the virus DNA into the host cytoplasm.


lateral wall of outer hair cell

The lateral wall of an outer hair cell (OHC) is a unique trilaminate composite consisting of the plasma membrane, an underlying cytoskeletal network containing an actin-spectrin cortical lattice, and an adjacent system of circumferential lamellar organelles known as the subsurface cisternae.


pathogen-containing vacuole

A membrane-bound intracellular compartment that is formed upon internalization of a pathogen into a host cell, and in which the pathogen resides.


IRE1-RACK1-PP2A complex

A protein complex consisting of IRE1 (Inositol-requiring enzyme-1), RACK1 (Receptor of activated protein kinase C 1, GNB2L1) and PP2A (protein phosphatase 2A). RACK1 acts as an adaptor to bridge an interaction between IRE1 and PP2A.


non-canonical inflammasome complex

An inflammasome complex containing CASP4, known as caspase-11 (Casp11) in mouse, which assembles upon cytosolic lipopolysaccharide-binding and directly activates Gasdermin-D (GSDMD).


type III site-specific deoxyribonuclease complex

A heterodimeric enzyme complex composed of two subunits, Res and Mod, that functions as an endonuclease and cleaves DNA. Cleavage will only occur when there are two un-methylated copies of a specific recognition site in an inverse orientation on the DNA. Cleavage occurs at a specific distance away from one of the recognition sites. The Mod subunit can act alone as a methyltansferase. DNA restriction systems such as this are used by bacteria to defend against phage and other foreign DNA that may enter a cell.


A heterodimeric complex between the tyrosine kinase receptor ERBB2 and a ligand-activated epidermal growth factor receptor (EGFR/ERBB1). ERBB2, which does not bind any known ligand, is activated through formation of a heterodimer with another ligand-activated ERBB family member such as EGFR.


glial cell projection

A prolongation or process extending from a glial cell.


astrocyte end-foot

Terminal process of astrocyte abutting non-neuronal surfaces in the brain.


spiny bracelet of Nageotte

Paranodal terminations of Schwann cells that do not directly contact the paranodal axon membrane. Usually found in thicker myelin.


astrocyte projection

A prolongation or process extending from the soma of an astrocyte and wrapping around neurons.


glial limiting end-foot

Terminal process of astrocyte that extends to the surface of the central nervous system. Together, glial limiting end-feet form the glial limiting membrane or glia limitans.


terminal loop

Portion of myelin-forming Schwann cell consisting of terminal cytoplasmic extensions adhered to the axon at the beginning and end of the myelin sheath.


capitate projection

Simple or compound process of epithelial glial cells with a spherical head that inserts into photoreceptor axons. Capitate projections have only been observed in Brachycera (flies).


ankyrin-1 complex

A complex composed of ANK1, RHCE, RHAG, SLC4A1, EPB42, GYPA, GYPB and AQP1, that functions in the stability and shape of the erythrocyte membrane in human.


cerebellar granule cell to Purkinje cell synapse

A synapse of a granule cell fiber onto the dendrites of a Purkinje cell in cerebellum.


pre-T cell receptor complex

A receptor complex found on immature T cells consisting of a T cell receptor beta chain and the pre-TCR-alpha chain, along with additional signaling components including CD3 family members and additional signaling proteins.


dense nuclear body

A location in the host cell nucleus where viral proteins colocalize late in infection prior to the onset of viral DNA synthesis. More than one site can be present simultaneously.


HSP90-CDC37 chaperone complex

A protein kinase chaperone complex required for the proper folding, maturation and stabilization of target proteins (mostly signaling protein kinases, some steroid hormone receptors), usually during or immediately after completion of translation. The highly conserved, phosphorylated CDC37-Ser13 (vertebrates) or cdc37-Ser14 (yeast) is essential for complex assembly and target protein binding. CDC37-Ser13 (Ser14) is phosphorylated by Casein kinase II (CK2), which in turn is a target of CDC37 creating a positive feedback loop. Complex binding also prevents rapid ubiquitin-dependent proteosomal degradation of target proteins.


NuA3 histone acetyltransferase complex

A Gcn5-independent multisubunit complex that catalyzes the acetylation of histone H3. The budding yeast complex includes Sas3p, Taf30p, and Yng1p.


acetyltransferase complex

A protein complex which is capable of acetyltransferase activity.


Mst2 histone acetyltransferase complex

A protein complex that can catalyze the acetylation of lysine at position 14 in histone H3, and contains Mst2 as the catalytic subunit. In fission yeast, contains at least Mst2, Nto1, Ptf2, Ptf1 and Eaf6.


transcription factor TFTC complex

A protein complex that does not contain either a TATA-binding protein (TBP) or a TBP-like factor, but is composed of several TAFIIs and other proteins, including a histone acetyltransferase. This complex is able to nucleate transcription initiation by RNA polymerase II, can mediate transcriptional activation, and has histone acetyltransferase activity.


histone H3-K14 acetyltransferase complex

A protein complex that can catalyze the acetylation of lysine at position 14 in histone H3.


Hpa2 acetyltransferase complex

A tetrameric protein complex capable of acetyltransferase activity. It can catalyze the transfer of an acetyl group from acetyl-CoA to an acceptor residue on histone H-3, histone H-4, or on polyamines. The complex is also capable of acetylating certain small basic proteins. The two Hpa2 dimers that make up the tetramer are held together by interactions between the bound acetyl-CoA molecules.


NuA3a histone acetyltransferase complex

A NuA3 complex that catalyzes the acetylation of Histone H3. In S. cerevisiae, this complex consists of Eaf6p, Nto1p, Sas3p, Taf14p, Yng1p and associates with H3K4me3 using Yng1p.


NatC complex

A conserved complex that catalyzes the transfer of an acetyl group to the N-terminal residue of a protein acceptor molecule that has a Met-Ile, Met-Leu, Met-Trp, or Met-Phe N-terminus. In Saccharomyces the complex includes Mak3p, Mak10p, and Mak31p.


MOZ/MORF histone acetyltransferase complex

A histone acetyltransferase complex that has histone H3 acetyltransferase and coactivator activities. Subunits of the human complex include MYST3/MOZ, MYST4/MORF, ING5, EAF6 and one of BRPF1, BRD1/BRPF2 and BRPF3.


NSL complex

A histone acetyltransferase complex that catalyzes the acetylation of a histone H4 lysine residues at several positions. In human, it contains the catalytic subunit MOF, NSL1/KIAA1267, NSL2/KANSL2, NSL3/KANSL3, MCRS1, PHF20, OGT1, WDR5 and HCF1.


ATAC complex

A chromatin remodeling complex that regulates transcription via acetylation primarily of nucleosomal histones H3 and possibly H4. Shares the histone acetylation (HAT) module of GCN5/PCAF-ADA2-ADA3-SGF29 (or orthologs) with the related SAGA complex (GO:0000124). Contains HAT subunits GCN5 or PCAF in a mutually exclusive manner. In addition to the HAT module contains DR1/NC2B, KAT14, MBIP, WDR5, YEATS2 and ZZZ3 or orthologs. Also regulates the activity of non-histone targets and orchestrates mitotic progression by regulating Cyclin A degradation through acetylation.


H3 histone acetyltransferase complex

A multisubunit complex that catalyzes the acetylation of histone H3.


diamine N-acetyltransferase complex

A protein complex which is capable of diamine N-acetyltransferase activity.


N-terminal protein acetyltransferase complex

A complex that catalyzes the transfer of an acetyl group to the N-terminal residue of a protein acceptor molecule.


MSL complex

A histone acetyltransferase complex that catalyzes the acetylation of a histone H4 lysine residue at position 16. In human, it contains the catalytic subunit MOF, and MSL1, MSL2 and MSL3.


SAGA-type complex

A histone acetyltransferase complex that acetylates nucleosomal histones H2B, H3, or H4 and is required for the expression of a subset of Pol II-transcribed genes. This complex includes the acetyltransferases GCN5/KAT2A or PCAF/KAT2B, several proteins of the ADA, SGF and SPT families, and several TBP-associate proteins (TAFs).


ADA complex

A chromatin remodeling complex that regulates transcription via acetylation primarily of nucleosomal histones H3 and H2B. In budding yeast shares the histone acetylation (HAT) module of ADA2-GCN5-NGG1-SGF29 with the related SAGA complex.


H4 histone acetyltransferase complex

A protein complex which is capable of H4 histone acetyltransferase activity.


NAGS/NAGK complex

A protein complex that acts both as N-acetylglutamate synthase (NAGS) catalysing the production of N-Acetylglutamate from glutamate and acetyl-CoA, and as N-acetylglutamate kinase (NAGK) catalysing the reaction ATP + N-acetyl-L-glutamate = ADP + N-acetyl-L-glutamyl 5-phosphate.


H4/H2A histone acetyltransferase complex

A multisubunit complex that catalyzes the acetylation of histones H4 and H2A.


histone acetyltransferase complex

A protein complex that possesses histone acetyltransferase activity.


protein acetyltransferase complex

A complex that catalyzes the transfer of an acetyl group to a protein acceptor molecule.


SLIK (SAGA-like) complex

A SAGA-type histone acetyltransferase complex that contains a smaller form of Spt7 (lacking the SPT8 binding region) than the fungal SAGA complex, and consequently lacks Spt8. The complex is involved in the yeast retrograde response pathway, which is important for gene expression changes during mitochondrial dysfunction.


NuA3b histone acetyltransferase complex

A NuA3 complex that catalyzes the acetylation of Histone H3. In S. cerevisiae, this complex consists of Eaf6p, Nto1p, Sas3p, Taf14p, Pdp3 and associates with H3K4me3 via Pdp3p.


EGFR-Grb2-Sos complex

A protein complex that contains the epidermal growth factor receptor (EGFR), Grb2 and the guanine nucleotide exchange factor Sos (or an ortholog thereof, such as mSos1), and is involved in linking EGFR activation to the p21-Ras pathway.


dystroglycan complex

A protein complex that includes alpha- and beta-dystroglycan, which are alternative products of the same gene; the laminin-binding component of the dystrophin-associated glycoprotein complex, providing a link between the subsarcolemmal cytoskeleton (in muscle cells) and the extracellular matrix. Alpha-dystroglycan is an extracellular protein binding to alpha-laminin and to beta-dystroglycan; beta-dystroglycan is a transmembrane protein which binds alpha-dystroglycan and dystrophin.


ventral disc microtubule array

A part of the ventral disc of Giardia species (trophozoite stage) consisting of a spiral array of microtubules linked to the ventral membrane. These microtubules form the base of the ventral disc dorsal microribbons that extend nearly perpendicular from the membrane.


chloroplast intermembrane space

The region between the inner and outer lipid bilayers of a chloroplast envelope.


GATA2-TAL1-TCF3-Lmo2 complex

A protein complex that contains the zinc finger transcription factor GATA2, the LIM domain protein Lmo2 (RBTN2), the basic helix-loop-helix protein TAL1 and its binding partner TCF3. The complex is involved transcriptional regulation in hematopoiesis.


Flemming body

A cell part that is the central region of the midbody characterized by a gap in alpha-tubulin staining. It is a dense structure of antiparallel microtubules from the central spindle in the middle of the intercellular bridge.


viral scaffold

A complex of proteins that form a scaffold around which the viral capsid is constructed.


unencapsulated part of cell

The part of a cell encompassing the intracellular environment and the plasma membrane; it excludes any external encapsulating structures.


glyoxysomal lumen

The volume enclosed by the membranes of a glyoxysome.


glycosome lumen

The volume enclosed by the membrane of a glycosome.


cytosolic proteasome core complex, alpha-subunit complex

The proteasome core subcomplex that constitutes the two outer rings of the cytosolic proteasome core complex.


lateral part of cell

The region of a polarized cell other than its tips or ends (in some cell types, one end may be called the apex and the other the base). For example, in a polarized epithelial cell, the lateral part includes the cell sides which interface adjacent cells.


lateral part of motile cell

The area of a motile cell perpendicular to the direction of movement.


incipient cellular bud site

The portion of the budding yeast plasma membrane where a daughter cell will emerge. The yeast marks this spot with bud-site selection proteins before bud emergence occurs. Actin is polarized to this spot just prior to and during bud emergence.


meiotic cohesin complex

A cohesin complex that mediates sister chromatid cohesion during meiosis; has a subunit composition distinct from that of the mitotic cohesin complex.


cohesin complex

A protein complex that is required for sister chromatid cohesion in eukaryotes. The cohesin complex forms a molecular ring complex, and is composed of structural maintenance of chromosomes (SMC) and kleisin proteins. For example, in yeast, the complex is composed of the SMC proteins Smc1p and Smc3p, and the kleisin protein Scc1p. In vertebrates, the complex is composed of the SMC1 (SMC1A or SMC1B) and SMC3 heterodimer attached via their hinge domains to a kleisin (RAD21, REC8 or RAD21L) which links them, and one STAG protein (STAG1, STAG2 or STAG3).


mitotic cohesin complex

A cohesin complex that mediates sister chromatid cohesion during mitosis; has a subunit composition distinct from that of the meiotic cohesin complex.


ethanolamine degradation polyhedral organelle

An organelle found in bacteria consisting of a proteinaceous coat containing enzymes for the degradation of ethanolamine whose purpose is the protection of the rest of the cell from the toxic acetaldehyde product of the enzyme ethanolamine ammonia lyase.


Derlin-1-VIMP complex

A protein complex containing, in mammals, Derlin-1 and VCP-interacting membrane protein (VIMP). The complex links the p97/VCP-containing ATPase complex with Derlin-1 during translocation of protein substrates from the endoplasmic reticulum to the cytosol for degradation by the cytosolic proteasome.


ESCRT II complex

An endosomal sorting complex required for transport and functions downstream of ESCRT I complex. It consists of the class E vacuolar protein sorting (Vps) proteins and is required for the membrane recruitment of ESCRT III complex and binds to ubiquitinated cargoes.


Ubisch body

A small, granular structure that is found in the extracellular matrix of cell of the secretory tapetal layer that surrounds developing pollen grains. Ubisch bodies have a sporopollenin coat, are attached to the peritapetal wall, and may play a role in pollen development.


SCF-Saf1/Pof9 ubiquitin ligase complex

An SCF ubiquitin ligase complex in which the F-box protein is Saf1 in S. cerevisiae (Pof9 in S. pombe).


cytoplasmic microtubule plus-end

Any microtubule plus-end that is part of a cytoplasmic microtubule.


cortical microtubule plus-end

The plus-end of a cortical microtubule.


neutrophil extracellular trap

Extracellular microbicidal structure composed of nuclear chromatin, histones and granular antimicrobial proteins. Histones and several neutrophil granule proteins associated with the DNA framework damage entrapped microorganisms.


alphaIIb-beta3 integrin-talin complex

A protein complex that consists of an alphaIIb-beta3 integrin complex bound to talin.


U4/U6 snRNP

A ribonucleoprotein complex that contains the extensively base paired small nuclear RNAs U4 and U6, a heptameric ring of Sm proteins associated with U4, the Lsm2-8 heptameric ring complex associated with U6, as well as several proteins that are unique to the U4 snRNP or U6 snRNPs, some of which remain associated with the U4/U6 snRNA both while the U4 snRNP is free or assembled into a series of spliceosomal complexes.


host cell chloroplast

A chlorophyll-containing plastid as found within host cells with thylakoids organized into grana and frets, or stroma thylakoids, and embedded in a stroma. The host is defined as the larger of the organisms involved in a symbiotic interaction.


host cell chloroplast thylakoid membrane

Any sac-like membranous structures (cisternae) in a chloroplast found in host cells, combined into stacks (grana) and present singly in the stroma (stroma thylakoids or frets) as interconnections between grana. The host is defined as the larger of the organisms involved in a symbiotic interaction.


host cell chloroplast part

Any constituent part of a chloroplast as it is found in host cells and which are a chlorophyll-containing plastid with thylakoids organized into grana and frets, or stroma thylakoids, and embedded in a stroma. The host is defined as the larger of the organisms involved in a symbiotic interaction.


neuromuscular junction

The junction between the axon of a motor neuron and a muscle fiber. In response to the arrival of action potentials, the presynaptic button releases molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane of the muscle fiber, leading to a change in post-synaptic potential.


excitatory neuromuscular junction of somatic myotube

A neuromuscular junction that functions in the excitation of somatic muscle myotubes, such as an arthropod somatic muscle cells.


inhibitory neuromuscular junction

The junction between the axon of a motor neuron and a muscle fiber. In response to the arrival of action potentials, the presynaptic button releases molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane of the muscle fiber, leading to a change in post-synaptic potential that inhibits muscle contraction.


inhibitory neuromuscular junction of somatic myotube

A neuromuscular junction that functions in the inhibition of somatic muscle myotube contraction. Examples of somatic muscle myotubes include the somatic muscle cells of arthropods.


neuromuscular junction of myotube

A neuromuscular junction in which the target muscle cell is a myotube.


neuromuscular junction of somatic muscle

A neuromuscular junction in which the target muscle cell is a somatic muscle cell, such as those found in nematodes and arthropods.


neuromuscular junction of somatic muscle myotube

A neuromuscular junction in which the target muscle cell is a somatic muscle myotube, such as an arthropod somatic muscle cell.


excitatory neuromuscular junction

The junction between the axon of a motor neuron and a muscle fiber. In response to the arrival of action potentials, the presynaptic button releases molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane of the muscle fiber, leading to a post-synaptic potential responsible for muscle contraction.


smooth endoplasmic reticulum membrane

The lipid bilayer surrounding the smooth endoplasmic reticulum.


excitatory synapse

A synapse in which an action potential in the presynaptic cell increases the probability of an action potential occurring in the postsynaptic cell.


parallel fiber to Purkinje cell synapse

An excitatory synapse formed by the parallel fibers of granule cells synapsing onto the dendrites of Purkinje cells.


cerebellar climbing fiber to Purkinje cell synapse

A synapse of a climbing fiber onto the dendrites of a Purkinje cell in cerebellum. The climbing fiber originates from the inferior olivary nucleus of the medulla oblongata.


asymmetric, glutamatergic, excitatory synapse

A neuron to neuron synapse with a postsynaptic density, that uses glutamate as a neurotransmitter and whose activity results in excitatory postsynaptic potentials.


P1 peroxisome

A subform of peroxisome that corresponds to an intermediate in a peroxisome assembly pathway, which operates by conversion of peroxisomal subforms in the direction P1, P2 -> P3 -> P4 -> P5 -> P6. P1 peroxisomes are distinguished from the other subforms on the bases of buoyant density and protein content; they contain fewer peroxisomal proteins than the other subforms.


bursicon neuropeptide hormone complex

A neuropeptide hormone secreted by the central nervous system of insects that stimulates the tanning and sclerotization of the adult cuticle following eclosion. The active hormone consists of an obligate heterodimer of the alpha and beta subunits.


nucleotide-excision repair factor 1 complex

One of several protein complexes involved in nucleotide-excision repair; possesses DNA damage recognition and endodeoxynuclease activities. In S. cerevisiae, it is composed of Rad1p, Rad10p, and Rad14p; in human the subunits are ERCC4/XPF, ERCC1 and XPA, respectively.


phosphatidylinositol 3-kinase complex, class IA

A class I phosphatidylinositol 3-kinase complex that possesses 1-phosphatidylinositol-4-phosphate 3-kinase activity; comprises a catalytic class IA phosphoinositide 3-kinase (PI3K) subunit and an associated SH2 domain-containing regulatory subunit that is a member of a family of related proteins often called p85 proteins. Through the interaction with the SH2-containing adaptor subunits, Class IA PI3K catalytic subunits are linked to tyrosine kinase signaling pathways.


extracellular isoamylase complex

A protein complex whose composition varies amongst species; in rice it probably exists in a homo-tetramer to homo-hexamer form and in Gram negative bacteria as a dimer. Functions in the hydrolysis of alpha-(1,6)-D-glucosidic branch linkages. Isoamylases in animals are localized in the extracellular space.


isoamylase complex

A protein complex whose composition varies amongst species; in rice it probably exists in a homo-tetramer to homo-hexamer form and in Gram-negative bacteria as a dimer. Functions in the hydrolysis of alpha-(1,6)-D-glucosidic branch linkages.


chloroplast isoamylase complex

A protein complex whose composition varies amongst species; in rice it probably exists in a homo-tetramer to homo-hexamer form and in Gram negative bacteria as a dimer. Functions in the hydrolysis of alpha-(1,6)-D-glucosidic branch linkages. Isoamylases in plants are intracellular and probably chloroplast localized.


rhoptry membrane

The lipid bilayer surrounding a rhoptry.


lytic vacuole membrane

The lipid bilayer surrounding a lytic vacuole and separating its contents from the cytoplasm of the cell.


lysosomal membrane

The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm.


cytolytic granule membrane

The lipid bilayer surrounding the cytolytic granule.


fungal-type vacuole membrane

The lipid bilayer surrounding a vacuole, the shape of which correlates with cell cycle phase. The membrane separates its contents from the cytoplasm of the cell. An example of this structure is found in Saccharomyces cerevisiae.


autolysosome membrane

A lipid bilayer that surrounds an autolysosome, a single-membrane-bounded vesicle in which endogenous cellular material is degraded.


PeBoW complex

A protein complex that is involved in coordinating ribosome biogenesis with cell cycle progression. In human, it is composed of Pes1, Bop1, and WDR12; in Saccharomyces the proteins are known as Nop7p, Erb1 and Ytm1 respectively.


eukaryotic translation initiation factor 3 complex, eIF3m

An eukaryotic translation initiation factor 3 complex that contains the PCI-domain protein eIF3m.


laminin-12 complex

A laminin complex composed of alpha2, beta1 and gamma3 polypeptide chains.


bacterial-type flagellum basal body, distal rod

The portion of the central rod of the bacterial-type flagellar basal body that is distal to the cell membrane; spans most of the distance between the inner and outer membranes.


outer endospore membrane

The outer membrane around a bacterial endospore, located between the endospore cortex and endospore coat.


chloroplast outer membrane

The outer, i.e. cytoplasm-facing, lipid bilayer of the chloroplast envelope.


cell outer membrane

A lipid bilayer that forms the outermost membrane of the cell envelope; enriched in polysaccharide and protein; the outer leaflet of the membrane contains specific lipopolysaccharide structures.


mycolate outer membrane

A mycolic acid-rich cell outer membrane containing a lipid bilayer and long-chain mycolic acids (hydroxylated branched-chain fatty acids) that are covalently linked to the cell wall peptidoglycan via an arabinogalactan network. Found in mycobacteria and related genera (e.g. corynebacteria).


organelle outer membrane

The outer, i.e. cytoplasm-facing in a cellular organelle, lipid bilayer of an organelle envelope.


plastid outer membrane

The outer, i.e. cytoplasm-facing, lipid bilayer of the plastid envelope.


interleukin-7 receptor complex

A protein complex that binds interleukin-7 (IL-7) and that consists of, at a minimum, an interleukin, an alpha and a gamma chain as well as optional additional kinase subunits. The alpha chain binds IL-7 with high affinity and subsequently binds the cytokine receptor common gamma chain that forms part of multiple interleukin receptors.


Cdr2 medial cortical node complex

A megadalton-sized complex at the medial cortex organized as an oligomeric core of SAD family protein kinases involved in cell size-dependent localization and phosphorylation of Wee1 during interphase.


nuclear exosome targeting complex

A protein-containing complex that functions with the RNA exosome and contributes to the degradation of abberant transcripts.


methanophenazine reducing hydrogenase complex

A protein complex which catalyzes the conversion of methanophenazine and hydrogen to form dihydromethanophenazine. This typically consists of three polypeptides.


MTREC complex

Protein complex formed by an RNA binding protein Red1, an RNA helicase Mtl1, Red5, Rmn1, Iss10/Pir1, and Ars2/Pir2. This complex is required for the recruitment of the nuclear exosome to Mmi1 nuclear focus. It is likely related to the human CBCN complex. This complex is also known as RNA silencing (NURS) complex.


raps-insc complex

Protein complex required for the asymmetric division of neuroblasts in Drosophila. Coordinates asymmetric localization of cell fate determinants with orientation of the mitotic spindle resulting in different daughter cells upon division. Localizes at the apical cortex of the neuroblast: Raps maintains, but does not initiate, Insc apically, while Insc segregates Raps asymmetrically. Complex appears to be conserved in mammals (composed of INSC and GPSM1 or GPSM2).


type I site-specific deoxyribonuclease complex

A multisubunit complex composed of two copies of a restriction (R) subunit, two copies of a methylation (M) subunit, and one copy of a specificity (S) subunit. This complex recognizes specific short DNA sequences (through the S subunit), and binds to them. If the recognition site is hemimethylated, the complex acts as a methyltransferase which modifies the recognition site, using S-adenosylmethionine as the methyl donor. Only the M and S subunits are required for this reaction. If the complex binds to an unmethylated recognition site, then the complex translocates the DNA bidirectionally in an ATP-dependent manner. When the translocation is stalled by impact with another complex or unusual DNA structure, the enzyme functions as an endonuclease and cleavage of the DNA will occur, hundreds or thousands of base pairs away from the recognition site. These DNA restriction systems are used by bacteria to defend against phage and other foreign DNA that may enter a cell.


nucleolus

A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome.


high-density lipoprotein particle

A lipoprotein particle with a high density (typically 1.063-1.21 g/ml) and a diameter of 5-10 nm that contains APOAs and may contain APOCs and APOE; found in blood and carries lipids from body tissues to the liver as part of the reverse cholesterol transport process.


spherical high-density lipoprotein particle

A mature high-density lipoprotein (HDL) particle, converted from discoidal HDL particles following the esterification of cholesterol in the particle by phosphatidylcholine-sterol O-acyltransferase (lecithin cholesterol acyltransferase; LCAT).


discoidal high-density lipoprotein particle

A newly formed high-density lipoprotein particle; consists of a phospholipid bilayer surrounded by two or more APOA1 molecules. The discoidal HDL particle is formed when lipid-free or lipid-poor APOA1 acquires phospholipids and unesterified cholesterol from either cell membranes or triglyceride-rich lipoproteins (undergoing lipolysis by lipoprotein lipase).


lysosomal matrix

A matrix composed of supramolecular assemblies of lysosomal enzymes and lipids which forms at a pH of 5.0 within the lysosome.


intermediate layer of mitotic spindle pole body

Structure between the central and outer plaques of the mitotic spindle pole body.


A protein-lipid-RNA complex containing separate high-density lipoprotein (HDL), lipid and RNA molecules. Separate in this context means not covalently bound to each other.


lateral element

A proteinaceous core found between sister chromatids during meiotic prophase.


Hrd1p ubiquitin ligase complex

A multiprotein complex that recognizes and ubiquitinates proteins with misfolded luminal and membrane domains during ER-associated protein degradation (ERAD). In S. cerevisiae, this complex contains the ubiquitin ligase Hrd1p. In mammals, this complex contains the ubiquitin ligase HRD1 (Synoviolin) or AMFR (gp78).


Hrd1p ubiquitin ligase ERAD-M complex

A multiprotein complex that recognizes and ubiquitinates proteins with misfolded membrane domains during ER-associated protein degradation (ERAD). In S. cerevisiae, this complex contains the ubiquitin ligase Hrd1p.


mitochondrial cloud

A prominent mass in the cytoplasm of previtellogenic oocytes. The cloud contains both mitochondria and electron-dense granulofibrillar material (GFM) and is the source of germinal granule material.


Bunina body

Small granular inclusions (about 1-3 microns in diameter) found in the anterior horn cells, and appearing either singly or in a group. Sometimes they are arranged in small beaded chains. Bunina bodies express cystatin C and consist of electron-dense amorphous material that contains tubules or vesicular structures. The amorphous material frequently includes a cytoplasmic island containing neurofilaments and other micro-organelles.


MHC protein complex

A transmembrane protein complex composed of an MHC alpha chain and, in most cases, either an MHC class II beta chain or an invariant beta2-microglobin chain, and with or without a bound peptide, lipid, or polysaccharide antigen.


MHC class II protein complex

A transmembrane protein complex composed of an MHC class II alpha and MHC class II beta chain, and with or without a bound peptide or polysaccharide antigen.


Syp1 complex

A protein complex that contributes to the endocytic process and bud growth in yeast. It is involved in the precise timing of actin assembly during endocytosis.


integrin alphav-beta8 complex

An integrin complex that comprises one alphav subunit and one beta8 subunit.


other organism part

Any constituent part of a secondary organism with which the first organism is interacting.


other organism cell membrane

The cell membrane of a secondary organism with which the first organism is interacting.


symbiont cell surface

The cell surface of a secondary, endosymbiont organism with which the first organism is interacting. The symbiont is defined as the smaller of the organisms involved in a symbiotic interaction.


trichocyst

A crystalline exocytotic organelle composed of small, acidic proteins existing primarily as disulphide-linked dimers. The trichocyst is an organelle that releases long filamentous proteins that capture predators in net-like structures, to slow them down when the cell is disturbed. The protein is nontoxic and shaped like a long, striated, fibrous shaft.


alpha9-beta1 integrin-ADAM15 complex

A protein complex that consists of an alpha9-beta1 integrin complex bound to the transmembrane metallopeptidase ADAM15.


syndecan-syntenin-ALIX complex

An exosome complex that is assembled in the multivesicular body (MVB) membrane and chaperoned to the exosome by the ESCRT-III machinery.


MKS complex

A protein complex that is located at the ciliary transition zone and consists of several proteins some of which are membrane bound. Acts as an organiser of transition zone inner structure, specifically the Y-shaped links, in conjunction with the NPHP complex. The MKS complex also acts as part of the selective barrier that prevents diffusion of proteins between the ciliary cytoplasm and cellular cytoplasm as well as between the ciliary membrane and plasma membrane.


postsynaptic cytosol

The region of the cytosol consisting of all cytosol that is part of the postsynapse.


cytosolic region

Any (proper) part of the cytosol of a single cell of sufficient size to still be considered cytosol.


presynaptic cytosol

The region of the cytosol consisting of all cytosol that is part of the presynapse.


meiotic septin complex

A heterooligomeric septin complex that acts during meiotic cell division.


collagen type XXVIII trimer

A collagen homotrimer of alpha1(XXVIII) chains.


unicellular trichome tip

A cell projection part that is the apical most portion of a unicellular trichome apex.


ISGF3 complex

A transcription factor complex that consists of a Stat1-Stat2 heterodimer and the IRF9 protein.


secondary cell wall cellulose synthase complex

A large, multimeric protein complex which catalyzes the biosynthesis of cellulose for the plant secondary cell wall. In Arabidopsis, contains the essential component proteins CESA8, CESA7, and CESA4.


cellulose synthase complex

A large, multimeric protein complex, organized in a rosette, which catalyzes the biosynthesis of cellulose for the plant cell wall.


primary cell wall cellulose synthase complex

A large, multimeric protein complex which catalyzes the biosynthesis of cellulose for the plant primary cell wall. In Arabidopsis, contains the essential component proteins CESA1 and -3, and a CESA6-related protein.


A protein complex that is formed by the association of a heterodimeric interleukin-4 receptor complex with an interleukin-4 molecule.


2-micrometer circle DNA

A plasmid commonly found in Saccharomyces, inherited in a non-Mendelian manner and often present in 100-400 copies.


transcription ternary complex

A protein-DNA-RNA complex composed of RNA polymerase, template DNA, and an RNA transcript.


apoptosome

A multisubunit protein complex involved in the signaling phase of the apoptotic process. In mammals it is typically composed of seven Apaf-1 subunits bound to cytochrome c and caspase-9. A similar complex to promote apoptosis is formed from homologous gene products in other eukaryotic organisms.


Cvt complex

A protein complex that is involved in the Cvt pathway. In budding yeast, the Cvt complex consists of multimers of preApe1p.


G-protein alpha(o)-synembrin complex

A protein complex formed by the association of the guanine nucleotide exchange factor synembrin with the alpha(o) subunit of a heterotrimeric G protein.


Lewy body corona

The periphery of a Lewy body. In Parkinson's disease, it contains spherical accumulations of filaments arranged in a loose, radiating array.


phospholamban complex

A protein complex found as a homopentamer of the phospholamban (PLN) protein in the sarcoplasmic reticulum (SR) membrane of cardiomyocytes. Cardiac PLN is a main determinant of muscle contraction and relaxation, by regulating intracellular calcium levels.


cleavage furrow rim

The part of the cleavage furrow closest to the cell surface.


right caudal basal body

Any ciliary basal body that is part of a right caudal flagellum found in Giardia species (trophozoite stage).


PAS complex

A class III phosphatidylinositol 3-kinase complex that contains a phosphatidylinositol-3-phosphate 5-kinase subunit (Fab1p in yeast; PIKfyve in mammals), a kinase activator, and a phosphatase, and may also contain additional proteins; it is involved in regulating the synthesis and turnover of phosphatidylinositol 3,5-bisphosphate. In mammals the complex is composed of PIKFYVE, FIG4 and VAC14. In yeast it is composed of Atg18p, Fig4p, Fab1p, Vac14p and Vac7p.


Golgi cis cisterna

The Golgi cisterna closest to the endoplasmic reticulum; the first processing compartment through which proteins pass after export from the ER.


CENP-A containing nucleosome

A form of nucleosome located only at the centromere, in which the histone H3 is replaced by the variant form CENP-A (sometimes known as CenH3).


anthranilate synthase complex

A heterotetrameric enzyme complex made up of two components I and two components II. Catalyzes the formation of anthranilate, pyruvate and L-glutamate from chorismate and L-glutamine.


molybdenum-iron nitrogenase complex

An enzyme complex containing a molybdenum-iron cluster found in many species. It is composed of two proteins, dinitrogenase and nitrogenase reductase; dinitrogenase, the molybdenum-iron protein, is tetrameric with an alpha2-beta2 structure, and nitrogenase reductase is a homodimer.


alphav-beta3 integrin-HMGB1 complex

A protein complex that consists of an alphav-beta3 integrin complex bound to high mobility group box 1 protein.


Set3 complex

A histone deacetylase complex that is involved in transcriptional regulation. In S. cerevisiae, this complex consists of Set3p, Snt1p, Hos4p, Sif2p, Cpr1p, Hos2p, and Hst1p.


transmembrane actin-associated (TAN) line

A linear array of nuclear envelope membrane proteins composed of nesprin-2G and SUN2, which couple the nucleus to moving actin cables, resulting in rearward nuclear transport (away from the leading edge).


growth cone leading edge

That part of the growth cone which represents the distal part of the structure.


leading edge of axonal growth cone

That part of the axonal growth cone which represents the distal part of the structure.


gerontoplast

A plastid found in senescing, formerly green tissues that is derived from a chloroplast that undergoes an organized developmental program of senescence.


cholinergic synapse

A synapse that uses acetylcholine as a neurotransmitter.


chloroplast ribosome

A ribosome contained within a chloroplast.


protein storage vacuole membrane

The lipid bilayer surrounding a protein storage vacuole.


enterobactin synthetase complex

A multienzyme complex usually composed of four proteins, EntB, EntD, EntE and EntF. Plays a role in the enterobactin biosynthesis pathway.


polyhydroxyalkanoate granule

An inclusion body located in the cytoplasm of prokaryotes that consists of polyhydroxyalkanoate (PHA) molecules and associated proteins, surrounded by a phospholipid monolayer; the proteins include PHA synthase, PHA depolymerase and 3HB-oligomer hydroxylase, phasins (PhaPs), which are thought to be the major structural proteins of the membrane surrounding the inclusion, and the regulator of phasin expression PhaR.


megasome

Large, cysteine proteinase rich lysosomes, often found in the amastigote (an intracytoplasmic, nonflagellated form of the parasite) stage of Leishmania species belonging to the mexicana complex.


cyanelle inner membrane

The inner, i.e. lumen-facing, lipid bilayer of the cyanelle envelope; also faces the cyanelle stroma.


SsuD-SsuE complex

A protein complex containing an alkanesulfonate monooxygenase subunit (SsuD tetramer in E.coli) and a flavin oxidoreductase subunit (SsuE dimer in E.coli). Involved in the utilization of alkanesulfonates as sulfur sources under conditions of sulfate or cysteine starvation.


A multilamellar subcellular structure formed in the cytoplasm of developing neuron, composed of Tmem240 and Emd proteins.


dolichyl-phosphate-mannose-protein mannosyltransferase Pmt5p-Pmt3p dimer complex

A protein dimer complex that possesses dolichyl-phosphate-mannose-protein mannosyltransferase activity and, in S. cerevisiae, is composed of Pmt5p-Pmt3p.


gamma DNA polymerase complex

A DNA polymerase complex consisting of a large subunit, responsible for the catalytic activities, and a small accessory subunit. Functions in the replication and repair of mitochondrial DNA.


early endosome lumen

The volume enclosed by the membrane of an early endosome.


late recombination nodule

An electron dense structure that is associated with meiotic chromosomes in pachytene during meiosis I.


bacterial-type flagellum basal body, rod

The central portion of the bacterial-type flagellar basal body, which spans the periplasm and threads through the rings.


enzyme activator complex

A protein complex capable of activating an enzyme. Activating subunits may dissociate from the catalytic unit before the enzyme is active.


DNA recombinase auxiliary factor complex

A protein complex that binds to a recombinase and incrseases its activity.


DNA polymerase processivity factor complex

A protein complex which is capable of increasing the processivity of nucleotide polymerization by DNA polymerase as a part of DNA replication.


PCNA complex

A protein complex composed of three identical PCNA monomers, each comprising two similar domains, which are joined in a head-to-tail arrangement to form a homotrimer. Forms a ring-like structure in solution, with a central hole sufficiently large to accommodate the double helix of DNA. Originally characterized as a DNA sliding clamp for replicative DNA polymerases and as an essential component of the replisome, and has also been shown to be involved in other processes including Okazaki fragment processing, DNA repair, translesion DNA synthesis, DNA methylation, chromatin remodeling and cell cycle regulation.


urease activator complex

A protein complex required for the activation of urease. Activator subunits dissociate before urease has catalytic function.


collagen type IV trimer

A collagen heterotrimer containing type IV alpha chains; [alpha1(IV)]2alpha2(IV) trimers are commonly observed, although more type IV alpha chains exist and may be present in type IV trimers; type IV collagen triple helices associate to form 3 dimensional nets within basement membranes.


contractile vacuole complex

A non-membrane-bounded organelle of eukaryotic cells, especially Protozoa, that fills with water from the cytoplasm and then discharges this externally. One of its functions is osmoregulatory.


kinetoplast

A sub-structure within the large single mitochondrion of kinetoplastid parasites and which is closely associated with the flagellar pocket and basal body of the flagellum.


antipodal site

The pole of the kinetoplast associated with kinetoplast DNA replication. The antipodal sites flank the kinetoplast DNA disk and are positioned approximately 180 degrees apart. In Trypanosoma brucei and Crithidia fasciculata, minicircles are attached at antipodal sites and they contain enzymes that catalyse some of the later reactions in minicircle replication.


RCAF complex

A protein complex that facilitates the assembly of nucleosomes on to newly synthesized DNA. In Drosophila, the complex comprises ASF1 and histones H3 and H4.


BRCA2-MAGE-D1 complex

A heterodimeric protein complex formed of BRCA2 and MAGE-D1; may mediate the synergistic activities of the two proteins in regulating cell growth.


actin capping protein of dynactin complex

A heterodimer consisting of alpha and beta subunits that binds to and caps the barbed ends of actin filaments, nucleates the polymerization of actin monomers but does not sever actin filaments, and which is a part of the dynactin complex.


SCF-YLR352W ubiquitin ligase complex

An SCF ubiquitin ligase complex in which the F-box protein is YLR352W in S. cerevisiae.


NOXA-BCL-xl complex

A heterodimeric protein complex consisting of NOXA and BCL-xl, members of the Bcl-2 family of anti- and proapoptotic regulators.


Ndc80 complex

An essential outer kinetochore complex involved in the attachment of microtubule ends to the chromosomes during mitosis.


ER membrane insertion complex

A protein complex that is involved in the post-translational delivery of tail-anchored (TA) membrane proteins to the endoplasmic reticulum. TA membrane proteins, also called type II transmembrane proteins, contain a single C-terminal transmembrane region. Some ER membrane insertion complex subunits are conserved between different species such as mammals and budding yeast.


integrin alpha9-beta1 complex

An integrin complex that comprises one alpha9 subunit and one beta1 subunit.


Cus cation efflux complex

Transmembrane complex that mediates resistance to copper and silver by cation efflux directly from the cell using the proton-motive force. Spans the inner membrane, periplasm, and outer membrane. Primarily activated under anaerobic conditions by CusR and CusS but also expressed under extreme copper stress, in aerobic growth.


CSF1-CSF1R complex

A protein complex consisting of a macrophage colony-stimulating factor (CSF1, also called M-CSF) dimer bound to a dimerized receptor (CSF1R, also called FMS). Receptor dimerization requires the presence of the ligand.


eif4e-cup complex

A protein complex that causes translational repression in Drosophila. Prevents assembly of ribosomes at the mRNA by interfacing with a sequence-specific RNA-binding protein leading to recruitment of the CCR4 complex and consequently, reduction of the mRNA's poly(A) tail length. The complex is also required for dorso-ventral pattern formation in the embryo.


plasma membrane respiratory chain complex IV

A part of the respiratory chain located in the plasma membrane, containing the 13 polypeptide subunits of cytochrome c oxidase, including cytochrome a and cytochrome a3. Catalyzes the oxidation of reduced cytochrome c by dioxygen (O2). Examples of this component are found in bacterial species.


cytoplasmic SCF ubiquitin ligase complex

A ubiquitin ligase complex, located in the cytoplasm, in which a cullin from the Cul1 subfamily and a RING domain protein form the catalytic core; substrate specificity is conferred by a Skp1 adaptor and an F-box protein. SCF complexes are involved in targeting proteins for degradation by the proteasome. The best characterized complexes are those from yeast and mammals (with core subunits named Cdc53/Cul1, Rbx1/Hrt1/Roc1).


inaD signaling complex

A complex of proteins that are involved in phototransduction and attached to the transient receptor potential (TRP) channel. The protein connections are mediated through inaD.


bacterial degradosome

The degradosome is a protein complex playing a key role in mRNA degradation and RNA processing. It includes a RNA helicase, a 3'-5' phosphate-dependent PNPase and a RNase E bound-enolase.


nuclear telomere cap complex

A complex of DNA and protein located at the end of a linear chromosome in the nucleus that protects and stabilizes a linear chromosome.


integrator complex

A protein complex that stably associates with the C-terminus of RNA polymerase II and mediates 3'-end processing of small nuclear RNAs generated by RNA polymerase II.


core TFIIH complex portion of holo TFIIH complex

The core TFIIH complex when it is part of the general transcription factor TFIIH.


glomerular endothelium fenestra

A large plasma membrane-lined circular pore that perforates the flattened glomerular endothelium and, unlike those of other fenestrated capillaries, is not spanned by diaphragms; the density and size of glomerular fenestrae account, at least in part, for the high permeability of the glomerular capillary wall to water and small solutes.


collagen type XXVI trimer

A collagen homotrimer of alpha1(XXVI) chains.


myosin XIII complex

A myosin complex containing one or more class XIII myosin heavy chains and associated light chains.


alpha4-beta1 integrin-CD81 complex

A protein complex that consists of an alpha4-beta1 integrin complex bound to membrane protein CD81, a member of the tetraspan family.


An enzyme complex that catalyzes the formation of hydroxypyruvate and alanine from serine and pyruvate.


chloroplast ADPG pyrophosphorylase complex

An ADPG pyrophosphorylase complex found in the chloroplast.


Ig heavy chain-bound endoplasmic reticulum chaperone complex

A protein complex that is located in the endoplasmic reticulum (ER) and is formed by the association of an immunoglobulin heavy chain with the proteins of the ER chaperone complex; the latter include BiP, GRP94; CaBP1, protein disulfide isomerase (PDI), ERdj3, cyclophilin B, ERp72, GRP170, UDP-glucosyltransferase, and SDF2-L1.


succinate-CoA ligase complex (ADP-forming)

A heterodimeric enzyme complex, composed of an alpha and beta chain, most usually found in (but not limited to) bacteria. Functions in the TCA cycle, hydrolyzing succinyl-CoA into succinate and CoA, thereby forming ATP.


titin-telethonin complex

A protein complex formed between the N-terminus of the giant sarcomeric filament protein titin and the Z-disk ligand, telethonin. The complex is part of the Z-disk of the skeletal and cardiac sarcomere. Telethonin binding to titin might be essential for the initial assembly, stabilization and functional integrity of the titin filament, and hence important for muscle contraction relaxation in mature myofibrils.


sarcoglycan complex

A protein complex formed of four sarcoglycans plus sarcospan; there are six known sarcoglycans: alpha-, beta-, gamma-, delta-, epsilon- and zeta-sarcoglycan; all are N-glycosylated single-pass transmembrane proteins. The sarcoglycan-sarcospan complex is a subcomplex of the dystrophin glycoprotein complex, and is fixed to the dystrophin axis by a lateral association with the dystroglycan complex.


alphaV-beta3 integrin-tumstatin complex

A protein complex that consists of an alphaV-beta3 integrin complex bound to tumstatin, the NC1 domain of the alpha3 chain of type IV collagen.


Scc2-Scc4 cohesin loading complex

A eukaryotically conserved heterodimeric protein complex (comprising adherin and the chromatid cohesion factor MAU2/Scc4/Ssl3) required for the loading of a cohesin, complex onto DNA.


Myc-Max complex

A transcription factor complex that consists of a heterodimer of the bHLH-ZIP proteins Myc and Max.


myosin complex

A protein complex, formed of one or more myosin heavy chains plus associated light chains and other proteins, that functions as a molecular motor; uses the energy of ATP hydrolysis to move actin filaments or to move vesicles or other cargo on fixed actin filaments; has magnesium-ATPase activity and binds actin. Myosin classes are distinguished based on sequence features of the motor, or head, domain, but also have distinct tail regions that are believed to bind specific cargoes.


DNA replication preinitiation complex

A protein-DNA complex assembled at eukaryotic DNA replication origins immediately prior to the initiation of DNA replication. The preinitiation complex is formed by the assembly of additional proteins onto an existing prereplicative complex. In budding yeast, the additional proteins might include Cdc45p, Sld2p, Sld3p, Dpb11p, DNA polymerases, and others; in fission yeast the GINS complex is present.


viral portal complex

A multimeric ring of proteins through which the DNA enters and exits the viral capsid.


type I interferon receptor complex

A heterodimeric protein complex that binds a type I interferon and transmits the signal across the membrane into the cell. Consists of an alpha subunit (IFNAR1) and a beta subunit (IFNAR2).


decoy receptor complex

A receptor complex that recognizes, binds and sequesters a specific receptor ligand to prevent it from binding to its regular receptor. May be soluble or membrane bound.


nucleotide-excision repair, DNA damage recognition complex

A protein complex that is capable of identifying lesions in DNA, such as pyrimidine-dimers, intrastrand cross-links, and bulky adducts. The wide range of substrate specificity suggests that the repair complex recognizes distortions in the DNA helix. It subsequently recruits a nucleotide-excision repair, preincision complex.


U4atac snRNP

A ribonucleoprotein complex that contains small nuclear RNA U4atac, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U4atac snRNP, most of which remain associated with the U4atac snRNA both while the U4atac snRNP is free or assembled into the U4atac/U6atac complex or into a series of spliceosomal complexes.


alpha9-beta1 integrin-ADAM9 complex

A protein complex that consists of an alpha9-beta1 integrin complex bound to the transmembrane metallopeptidase ADAM9.


TRAPPIII protein complex

A complex that functions in anterograde transport at the Golgi and also regulates autophagy. In yeast it includes at least the following subunits: Bet3 (as homodimer), Bet5, Trs20, Trs23, Trs31, Trs33, Trs85. TRAPPIII may include further, as yet undescribed, proteins.


sigma factor antagonist complex

A protein complex which is capable of sigma factor antagonist activity.


A protein complex that functions as a phospholipid-translocating P-Type ATPase.


inner kinetochore

The region of a kinetochore closest to centromeric DNA which contains many CENP proteins organized in various subcomplexes including CENP-C, CENP-LN, CENP-HIKM, CENP-OPQUR and CENP-TWSX, but excluding the CENP-A containing heterochromatin.


laminin-5B complex

A laminin complex composed of alpha3B, beta3 and gamma2 polypeptide chains.


TSC1-TSC2 complex

A protein complex consisting of at least tumerin and hamartin; its formation may regulate hamartin homomultimer formation. The complex acts as a GTPase activating protein (GAP) for the small GTPase (Rheb), and inhibits the TOR signaling pathway.


Fc-gamma receptor III complex

A protein complex composed of an Fc-gamma RIII alpha chain and an Fc-epsilon RI gamma chain dimer with or without an Fc-epsilon RI beta chain and additional signaling components. The complex functions primarily as an activating receptor for IgG.


sweet taste receptor complex

A protein complex which is capable of sweet taste receptor activity.


alpha6-beta4 integrin-Fyn complex

A protein complex that consists of an alpha6-beta4 integrin complex bound to the Src family tyrosine kinase Fyn.


nucleoplasmic THO complex

The THO complex when it is acting as a nuclear complex that is required for transcription elongation through genes containing tandemly repeated DNA sequences. In S. cerevisiae, it is composed of four subunits: Hpr1, Tho2, Thp2, and Mft1, while the human complex is composed of 7 subunits.


larval serum protein complex

A multisubunit protein complex which, in Drosophila, is a heterohexamer of three subunits, alpha, beta and gamma. The complex is thought to store amino acids for synthesis of adult proteins.


cytoplasmic ubiquitin ligase complex

A ubiquitin ligase complex found in the cytoplasm.


homodimeric decaprenyl diphosphate synthase complex

A homodimeric complex that possesses di-trans,poly-cis-decaprenylcistransferase activity; involved in ubiquinone biosynthesis.


egasyn-beta-glucuronidase complex

A protein complex that contains beta-glucuronidase and the carboxyl esterase egasyn; formation of the complex causes beta-glucuronidase to be retained in the endoplasmic reticulum.


alpha9-beta1 integrin-tenascin complex

A protein complex that consists of an alpha9-beta1 integrin complex bound to the extracellular matrix protein tenascin.


SRF-myogenin-E12 complex

A transcription factor complex that contains the serum response factor (SRF) and the basic helix-loop-helix proteins myogenin and E12, and is involved in activating transcription of muscle-specific genes.


TAM protein secretion complex

A heterooligomeric protein complex that spans the bacterial periplasm and enables the secretion of adhesin proteins in Gram-negative bacteria. In Citrobacter rodentium, Salmonella enterica and Escherichia coli, the TAM complex consists of an Omp85-family protein, TamA, in the outer membrane and TamB in the inner membrane.


spitzenkorper

Structure within the hyphal tip of filamentous fungi that acts as an organizing center for hyphal tip growth; may function to supply vesicles to the elongating tip and/or to organize cytoskeletal microfilaments.


plasma membrane succinate dehydrogenase complex (ubiquinone)

The enzyme, located in the plasma membrane, that catalyzes the oxidation of succinate and ubiquinone to fumarate and ubiquinol; involved in aerobic respiration, repressed in anaerobic respiration.


DnaA-oriC complex

A protein-DNA complex containing the initiator protein DnaA bound to high-affinity recognition sites in the unique origin of replication, oriC. DnaA-oriC binding is the first step in assembly of a bacterial pre-replicative complex (pre-RC) and is responsible for the timely initiation of replication once per cell cycle.


maltose transport complex

Protein complex facilitating ATP-dependent maltose transport through inner cell membrane (periplasm to cytoplasm) in Gram-negative bacteria. In E. coli the system is composed of a periplasmic maltose-binding protein (MBP), two integral membrane proteins, MalF and MalG, and two copies of the cytoplasmic ATP-binding cassette MalK.


box H/ACA telomerase RNP complex

A box H/ACA ribonucleoprotein complex that contains the RNA component of vertebrate telomerase, the enzyme essential for the replication of chromosome termini in most eukaryotes. This ribonucleoprotein complex is a structural box H/ACA RNP, which does not have the catalytic pseudouridylation function shared by the majority of H/ACA RNPs present in the cell.


protein kinase complex

A protein complex which is capable of protein kinase activity.


TIM22 mitochondrial import inner membrane insertion complex

A multi-subunit complex embedded in the mitochondrial inner membrane that mediates the inner membrane insertion of multi-transmembrane spanning proteins that contain internal targeting elements. In yeast cells, TIM22 is a 300-kDa complex, consisting of four membrane integral subunits, Tim22, Tim54, Tim18 and Sdh3, and a peripheral chaperone complex consisting of the small TIM proteins, Tim9-Tim10-Tim12.


interferon regulatory factor complex

A protein complex that consists of two interferon regulatory proteins (IRFs); may be homodimeric or heterodimeric. The activation of a latent closed conformation of IRF in the cytoplasm is triggered by phosphorylation of Ser/Thr residues in a C-terminal region. Phosphorylation stimulates the C-terminal autoinhibitory domain to attain a highly extended conformation triggering dimerization through extensive contacts to a second subunit.


A protein complex that consists of an alphav-beta3 integrin complex bound to osteopontin.


respiratory chain complex

Any protein complex that is part of a respiratory chain.


plastid mRNA editing complex

An mRNA editing complex found in a plastid.


RZZ complex

A kinetochore component required for both meiotic and mitotic spindle assembly checkpoints.


TFIIIC-TOP1-SUB1 complex

A protein complex that contains TFIIIC, topoisomerase 1, and Sub1/PC4. Characterized in human, the complex is involved in regulating transcription from RNA polymerase III (Pol III) promoters. Topoisomerase 1 and Sub1 enhance the accuracy of transcription termination, and promote reinitiation by Pol III.


transcription factor TFIID complex

A complex composed of TATA binding protein (TBP) and TBP associated factors (TAFs); the total mass is typically about 800 kDa. Most of the TAFs are conserved across species. In TATA-containing promoters for RNA polymerase II (Pol II), TFIID is believed to recognize at least two distinct elements, the TATA element and a downstream promoter element. TFIID is also involved in recognition of TATA-less Pol II promoters. Binding of TFIID to DNA is necessary but not sufficient for transcription initiation from most RNA polymerase II promoters.


SCF-Cdc4 ubiquitin ligase complex

An SCF ubiquitin ligase complex in which the F-box protein is Cdc4 in S. cerevisiae.


plasma membrane signaling receptor complex

Any protein complex that is part of the plasma membrane and which functions as a signaling receptor.


HOPS complex

A multimeric protein complex that associates with the vacuolar membrane, late endosomal (multivesicular body) and lysosomal membranes. HOPS is a tethering complex involved in vesicle fusion.


anaerobic ribonucleoside-triphosphate reductase complex

An enzyme complex composed of 4 subunits, 2 copies of the large protein (nrdD in E. coli) and 2 copies of the small protein (nrdG in E. coli). It catalyzes the generation of 2'deoxyribonucleotides under anaerobic growth conditions. The larger subunit is the catalytic unit that is activated by the smaller iron-binding subunit.


RAD52-ERCC4-ERCC1 complex

A nucleotide-excision repair complex formed by the association of the heterodimeric endonuclease XPF/ERCC4-ERCC1 (Rad1p and Rad10p in S. cerevisiae) with the RAD52 protein.


A protein complex that consists of an alpha4-beta1 integrin complex bound to thrombospondin-2.


nucleolar preribosome

Any complex of pre-rRNAs, ribosomal proteins, and associated proteins formed in the nucleolus during ribosome biogenesis.


palmitoyltransferase complex

A protein complex with palmitoyltransferase activity.


histone methyltransferase complex

A multimeric complex that is able to catalyze the addition of methyl groups to histone proteins.


collagen type VIII trimer

A collagen heterotrimer containing type VIII alpha chains; [alpha1(VIII)2]alpha2(VIII) and alpha1(VIII)[alpha2(VIII)]2 trimers have been observed; type VIII collagen triple helices associate to form regular hexagonal nets.


inner mitochondrial membrane protein complex

Any protein complex that is part of the inner mitochondrial membrane.


laminin-11 complex

A laminin complex composed of alpha5, beta2 and gamma1 polypeptide chains.


1,3-beta-D-glucan synthase complex

A protein complex that catalyzes the transfer of a glucose group from UDP-glucose to a (1->3)-beta-D-glucan chain.


protein-DNA ISRE complex

A protein-DNA complex formed through interaction of the protein(s) with an interferon-stimulated response element (ISRE) in the DNA.


Scrib-APC complex

A protein complex that contains the Scribble protein (a cell polarity determinant) and the tumor suppressor protein adenomatous polyposis coli (APC); may be involved in the control of cell proliferation.


BCOR complex

A protein-containing complex that monoubiquitinates histone H2A on K119, thus it facilitates the maintenance of the transcriptionally repressive state of some genes, such as BCL6. It consists of the corepressor BCOR or BCORL1, a Polycomb group (PcG) and a SCF ubiquitin ligase subcomplexes. In mammals, the core subunits of the complex include the PcG and PcG-associated proteins NSPC1, RING1, RNF2, and RYBP and the components of the SCF ubiquitin ligase, SKP1, and FBXL10.


cytochrome o ubiquinol oxidase complex

A protein complex that possesses cytochrome o ubiquinol oxidase activity; consists of four polypeptide subunits and associated prosthetic groups.


pre-replicative complex

A protein-DNA complex that forms at the origin of replication during the initial step of DNA replication and allows the origin to become competent, or 'licensed', for replication.


radial spoke 3

Radial spoke 3 (RS3), when present, is the most distal of each group of radial spokes, whether grouped as triplets or doublets. RS3 has significantly different morphology and protein composition than RS1 and RS2 and also extends at a slant from the microtubule doublet, rather than perpendicularly like RS1 and RS2. In some organisms (e.g. Chlamydomonas and Sarcophaga bullata), RS3 is represented only as a stump attached to the A-microtubule lacking the rest of the stalk structure and entirely lacking the head structure.


G-protein alpha(i)1-synembrin complex

A protein complex formed by the association of the guanine nucleotide exchange factor synembrin with the alpha(i)1 subunit of a heterotrimeric G protein.


exocyst

A protein complex peripherally associated with the plasma membrane that determines where vesicles dock and fuse. At least eight complex components are conserved between yeast and mammals.


NHE3/E3KARP/ACTN4 complex

A heterotrimeric protein complex formed by the association of NHE3, E3KARP and alpha-actinin upon an increase in calcium ion concentration; found in clusters localized on plasma membrane and in intracellular compartments.


methionine-importing complex

A protein complex which is capable of methionine-importing activity.


contractile vacuole pore

Stable structure that regulates the flow of liquid between the contractile vacuole and the surrounding medium.


Aim21-Tda2 complex

A complex that localizes to actin cortical patches at sites of endocytosis and negatively regulates barbed end F-actin assembly, resulting in the generation of free actin pools. The Aim21-Tda2 complex is necessary for efficient endocytosis and balancing the distribution of actin between patches and cables.


DnaB-DnaC-DnaT-PriA-PriC complex

A protein-DNA complex consisting of the helicase loading complex DnaB-DnaC, replication restart proteins DnaT, PriA and PriC, and associated DNA. Involved in the restart of DNA replication after a stalled replication fork has been repaired.


nuclear pore cytoplasmic filaments

Filamentous extensions on cytoplasmic face of the nuclear pore complex (NPC). In S. cerevisiae, Nup159p, Nup82p, and Nup42p contribute to the cytoplasmic filaments. In vertebrates, Nup358 is a major component.


interleukin-27 complex

A protein complex that is composed of an interleukin-27p28 subunit (product of the IL27 gene) and an EBI3 subunit and is secreted into the extracellular space.


FAR/SIN/STRIPAK complex

A conserved protein phosphatase type 2A complex which contains a protein phosphatase type 2A, a protein phosphatase regulatory subunit, a striatin, an FHA domain protein and other subunits (at least six proteins). In fission yeast this complex negatively regulate the septation initiation network at the spindle pole body.


carbon phosphorus lyase complex

A protein complex which is capable of carbon phosphorus lyase activity.


clathrin coat of trans-Golgi network vesicle

A clathrin coat found on a vesicle of the trans-Golgi network.


RNA decapping complex

A protein complex consisting of a Dcp1 regulatory subunit and a Dcp2 catalytic subunit that has mRNA cap binding activity and is involved in decapping of nuclear-transcribed mRNA.


CD20-Lck-Fyn complex

A protein complex that contains the cell-surface protein CD20 and the Src family tyrosine kinases Lck and Fyn.


Cbf1-Met4-Met28 complex

A heteromeric complex consisting of Cbf1 and basic leucine zipper (bZIP) containing transcriptional activators, Met4 and Met28, that forms over the sequence TCACGTG in the upstream activating sequence (UAS) of genes involved in sulfur amino acid metabolism, resulting in their transcriptional activation.


homomeric SMAD protein complex

A protein complex composed of a single type of SMAD family proteins. In the absence of Smad4, phosphorylation of R-SMADs results in their homotrimerization. However, these complexes do not appear to import into the nucleus and are assumed to be transcriptionally inactive.


glutamate dehydrogenase complex

A homomeric protein complex that possesses glutamate dehydrogenase activity. This complex is evolutionarily conserved except that the number of homoprotomers per complex varies.


chloroplast ribulose bisphosphate carboxylase complex

A complex, located in the chloroplast, containing either both large and small subunits or just small subunits which carries out the activity of producing 3-phosphoglycerate from carbon dioxide and ribulose-1,5-bisphosphate. An example of this component is found in Arabidopsis thaliana.


alpha3-beta1 integrin-CD151 complex

A protein complex that consists of an alpha3-beta1 integrin complex bound to the tetraspanin CD151.


light-harvesting complex

A protein-pigment complex that may be closely or peripherally associated to photosynthetic reaction centers that participate in harvesting and transferring radiant energy to the reaction center.


radial spoke base 3

The short portion of the radial spoke 3 (RS3 )that is directly anchored to the A microtubule of an axonemal microtubule doublet.


potassium:proton exchanging ATPase complex

A protein complex that possesses hydrogen:potassium-exchanging ATPase activity; characterized in animal cells, where it maintains ionic gradients of K+ at the expense of ATP hydrolysis; The complex contains two obligatory subunits, the catalytic alpha subunit and a glycosylated beta subunit; two additional subunits, gamma and channel-inducing factor (CHIF), may also be present.


calcineurin complex

A heterodimeric calcium ion and calmodulin dependent protein phosphatase composed of catalytic and regulatory subunits; the regulatory subunit is very similar in sequence to calmodulin.


adenylyltransferase complex

A protein complex which is capable of adenylyltransferase activity.


retromer complex

A conserved hetero-pentameric membrane-associated complex involved in retrograde transport from endosomes to the Golgi apparatus. The budding yeast retromer comprises Vps35p, Vps29p, Vps26p, Vps5p, and Vps17p. The mammalian complex shows slight variation in composition compared to yeast, and comprises SNX1 or SNX2, SNX5 or SNX6, VPS26A or VPS26B, VPS29, and VPS35.


A protein complex that consists of an alpha1-beta1 integrin complex bound to a type VI collagen triple helix containing an alpha3(VI) chain.


meiotic recombination initiation complex

A protein complex that initiates the formation of double-strand breaks (DSBs) required for meiotic recombination. Consists of a protein that catalyses formation of the double-strand breaks (Spo11 in S. cerevisiae and Rec12 in S. pombe), and a number of accessory proteins.


cargo receptor complex

Any protein complex that is part of a membrane and which functions as a cargo receptor.


mitochondrial proton-transporting ATP synthase, catalytic core

The hexamer, comprising three alpha and three beta subunits, that possesses the catalytic activity of the mitochondrial hydrogen-transporting ATP synthase.


molybdopterin cofactor (Moco) biosynthesis adenylyltransferase complex

A heterodimeric protein complex which adenylates two molecules of the sulfur carrier subunit of the molybdopterin (MPT) cofactor synthase using ATP as part of molybdopterin cofactor (Moco) biosynthesis. In E. coli the subunits are MoeB and MoaD; Moco biosynthesis and its constituent molecules are evolutionarily conserved.


A protein complex which is capable of glycerol-3-phosphate-transporting ATPase activity.


interleukin-18 receptor complex

A protein complex that binds interleukin-18; comprises an alpha and a beta subunit.


zona pellucida receptor complex

A multisubunit complex comprising the chaperonin-containing T-complex and several other components involved in mediating sperm-oocyte Interaction.


MCM8-MCM9 complex

A hexameric protein complex composed of MCM8 and MCM9 and involved in homologous recombination repair following DNA interstrand cross-links.


lipopolysaccharide transport system

A protein-containing complex that functions to transport lipopolysaccharide from its site of synthesis at the cytoplasmic membrane across the periplasm to the outer membrane in an ATP-dependent manner.


RNA polymerase I core factor complex

A RNA polymerase I-specific transcription factor complex that is required for the transcription of rDNA by RNA polymerase I. In yeast the complex consists of Rrn6p, Rrn7p, and Rrn11p.


insulin receptor complex

A disulfide-bonded, heterotetrameric receptor complex. The alpha chains are entirely extracellular, while each beta chain has one transmembrane domain. The ligand binds to the alpha subunit extracellular domain and the kinase is associated with the beta subunit intracellular domain.


clathrin complex

A protein complex that consists of three clathrin heavy chains and three clathrin light chains, organized into a symmetrical three-legged structure called a triskelion. In clathrin-coated vesicles clathrin is the main component of the coat and forms a polymeric mechanical scaffold on the vesicle surface.


CNTFR-CLCF1 complex

A protein complex that is composed of two soluble ciliary neurotrophic factor receptor alpha subunits (product of the CNTFR gene) and two molecules of cardiotrophin-like cytokine factor 1 (product of the CLCF1 gene). The complex is secreted into the extracellular space.


proton-transporting ATP synthase, central stalk

One of two stalks that connect the catalytic core of the hydrogen-transporting ATP synthase to the membrane-associated Fo proteins; rotates within the catalytic core during catalysis.


integrin alphav-beta1 complex

An integrin complex that comprises one alphav subunit and one beta1 subunit.


alpha6-beta4 integrin-Shc-Grb2 complex

A protein complex that consists of an alpha6-beta4 integrin complex bound to the adaptor proteins Shc and Grb2.


dolichyl-phosphate-mannose-protein mannosyltransferase Pmt1p-Pmt3p dimer complex

A protein dimer complex that possesses dolichyl-phosphate-mannose-protein mannosyltransferase activity and, in S. cerevisiae, is composed of Pmt1p-Pmt3p.


ESCRT I complex

An endosomal sorting complex required for transport. It consists of the class E vacuolar protein sorting (Vps) proteins and interacts with ubiquitinated cargoes.


ribonuclease P complex

A ribonucleoprotein complex that catalyzes cleavage of the leader sequence of precursor tRNAs (pre-tRNAs), generating the mature 5' end of tRNAs.


alpha9-beta1 integrin-VEGF-D complex

A protein complex that consists of an alpha9-beta1 integrin complex bound to vascular endothelial growth factor D.


A protein complex that consists of an alphav-beta3 integrin complex bound to thrombospondin.


PSII associated light-harvesting complex II, core complex

The pigment-protein complex primarily associated to PSII in higher plants, green algae and cyanobacteria that directly transfers electrons to the reaction center.


alphav-beta3 integrin-CD47 complex

A protein complex that consists of an alphav-beta3 integrin complex bound to CD47 (also known as IAP).


Noc2p-Noc3p complex

A heterodimer associated with 66S preribosomes; predominantly nucleoplasmic, but also locates to the nucleolus; involved in ribosomal large subunit biogenesis.


chromatin lock complex

A chromatin silencing complex that binds and bridges separate nucleosomal histones resulting in heterochromatin assembly and chromatin looping.


COPII vesicles tethering complex

A protein complex that resides in the cis-golgi membrane and plays a role in the tethering of COPII vesicles, through an interaction with vesicle tethering proteins (p115 in H. Sapiens and Uso1 S. cerevisiae), granting the cis-Golgi and endoplasmic reticulum to Golgi vesicle-mediated transport. It is composed by GRASP65 and GM130 protein in H. sapiens and by Bug1 and Grh1 proteins in S. cerevisiae.


MCM core complex

A protein complex that contains Mcm4, Mcm6, and Mcm7 proteins, and possesses DNA helicase activity. In the heterohexameric MCM complex, the Mcm4/6/7 proteins form a stable core, and Mcm2, Mcm3, and Mcm5 are more peripherally associated.


Grb2-Sos complex

A protein complex that contains Grb2 and the guanine nucleotide exchange factor Sos (or an ortholog thereof, such as mSos1), and is involved in linking EGFR activation to the p21-Ras pathway.


curli secretion complex

A protein-containing complex that serves as a channel for the secretion of curli. Curli are a fibers that serve as a major component of the extracellular matrix of pellicle biofilms.


homotetrameric ADPG pyrophosphorylase complex

A protein complex composed of four identical subunits that possesses ADPG pyrophosphorylase activity. Examples of this component are found in Bacterial species.


nucleolar ribonuclease P complex

A ribonuclease P complex located in the nucleolus of a eukaryotic cell, where it catalyzes the 5' endonucleolytic cleavage of precursor tRNAs to yield mature tRNAs. Eukaryotic nucleolar ribonuclease P complexes generally contain a single RNA molecule that is necessary but not sufficient for catalysis, and several protein molecules.


interferon regulatory factor 3-interferon regulatory factor 5 complex

An interferon regulatory factor complex that consists of a heterodimer of interferon regulatory factor 3 and interferon regulatory factor 5.


ARC complex

A ribonucleoprotein complex that contains members of the Argonaute family of proteins, additional protein subunits, and duplex siRNA; required for heterochromatin assembly and siRNA generation. Possibly involved in the conversion of ds siRNA to ss siRNA.


SCF-YDR131C ubiquitin ligase complex

An SCF ubiquitin ligase complex in which the F-box protein is YDR131C in S. cerevisiae.


BMP receptor complex

A protein complex that acts as a receptor for bone morphogenetic proteins (BMPs); a homo- or heterodimer of type I and/or type II BMP receptor subunits.


cardiac Troponin complex

A complex of accessory proteins (cardiac troponin T, cardiac troponin I and cardiac troponin C) found associated with actin in cardiac muscle thin filaments; involved in calcium regulation important for muscle contraction.


eukaryotic 43S preinitiation complex

A protein complex composed of the 40S ribosomal subunit plus eIF1, eIF1A, eIF3, eIF5, and eIF2-GTP-bound methionyl-initiator methionine tRNA.


chloroplast proton-transporting ATP synthase complex, catalytic core CF(1)

The catalytic sector of the mitochondrial hydrogen-transporting ATP synthase; it comprises the catalytic core and central stalk, and is peripherally associated with the chloroplast thylakoid membrane when the entire ATP synthase is assembled. The chloroplast F0 domain contains three alpha, three beta, one gamma, one delta, and one epsilon subunits.


acid phosphatase complex

A protein complex which is capable of acid phosphatase activity.


caveolar macromolecular signaling complex

A complex composed of proteins required for beta adrenergic receptor activation of protein kinase A. It includes the Cav 12. subunit of L-type calcium channel, protein kinase A regulatory subunit 2(PKAR2), adenyl cyclase, beta-adrenergic receptor, G-alpha-S, protein phosphatase 2A (PP2A) and caveolin 3 (CAV3).


phosphatidylinositol phosphate phosphatase complex

A protein complex which is capable of phosphatidylinositol phosphate phosphatase activity.


succinate dehydrogenase complex (ubiquinone)

The enzyme that catalyzes the oxidation of succinate and ubiquinone to fumarate and ubiquinol; involved in aerobic respiration, repressed in anaerobic respiration.


high-affinity iron exporter complex

A protein complex which transports ferrous iron (Fe(III) or Fe3+) ions from the vacuole, the main storage component of intracellular free iron, into the cytoplasm in a low iron environment.


SLAC complex

A protein complex that regulates Arp2/3 complex-mediated actin nucleation.


complement component C1q complex

A protein-containing complex composed of six subunits of each of the three homologous polypeptide chains C1QA, C1QB, and C1QB. It is a subunit of the complement C1 complex. In addition to complement activation, C1q appears to have roles in homeostasis and cellular development, superoxide (O2-) production by neutrophils, blood coagulation and neurological synapse pruning.


endobrevin-SNAP-25-syntaxin-2 complex

A SNARE complex that contains endobrevin (VAMP8), SNAP-25, and syntaxin 2 (or orthologs thereof).


transcription factor TFIIIC complex

A heterotrimeric transcription factor complex that is involved in regulating transcription from RNA polymerase III (Pol III) promoters. TFIIIC contains three conserved subunits that associate with the proximal Pol III promoter element, and additional subunits that associate with sequence elements downstream of the promoter and are more diverged among species. It also functions as a boundary element to partition genome content into distinct domains outside Pol III promoter regions.


dihydrolipoyl dehydrogenase complex

A protein complex that possesses alpha-ketoglutarate dehydrogenase activity.


Vma12-Vma22 assembly complex

A protein complex that is involved in the assembly of the V-ATPase complex. In the budding yeast Saccharomyces cerevisiae, this complex consists of Vma12p and Vma22p.


gamma-secretase complex

A protein complex that has aspartic-type endopeptidase activity and contains a presenilin catalytic subunit (either PSEN1 or PSEN2), an APH1 subunit (multiple genes and splice variants exist), nicastrin (NCT), and presenilin enhancer (aka PEN-2 or Psenen), as the core complex. Variants of the complex with different subunit compositions differ in localization and specific substrates. Additionally, variants of the complex exist that contain a additional regulatory subunit as well as the four core subunits; known regulatory subunits include gamma-secretase-activating protein (aka gSAP), TMP1 (aka TMED10), and CD147 antigen (aka basigin). Gamma-secretase cleaves type I transmembrane protein substrates, including the cell surface receptor Notch and the amyloid-beta precursor protein.


ATPase dependent transmembrane transport complex

A transmembrane protein complex that functions in ATPase dependent active transport across a membrane.


potassium ion-transporting ATPase complex

Protein complex that carries out the reaction: ATP + H2O + K+(out) = ADP + phosphate + K+(in). It is a high affinity potassium uptake system. The E. coli complex consists of 4 proteins: KdpA is the potassium ion translocase, KdpB is the ATPase, and KdpC and KdpF seem to be involved in assembly and stabilization of the complex.


multi-eIF complex

A multifactor complex composed of multiple translation initiation factors and the initiatior tRNAiMet, which is ready to bind to the small (40S) ribosome to form the 43S preinitiation complex. In S. cerevisiae, this complex is composed of eIF1, eIF2, eIF3, and eIF5.


laminin-14 complex

A laminin complex composed of alpha4, beta2 and gamma3 polypeptide chains.


U4atac/U6atac snRNP

A ribonucleoprotein complex that contains the extensively base paired small nuclear RNAs U4atac and U6atac, a heptameric ring of Sm proteins associated with U4atac, the Lsm2-8 heptameric ring complex associated with U6atac, as well as several proteins that are unique to the U4atac snRNP or U6atac snRNPs, some of which remain associated with the U4atac/U6atac snRNA both while the U4atac snRNP is free or assembled into a series of spliceosomal complexes.


endobrevin-SNAP-25-syntaxin-1a complex

A SNARE complex that contains endobrevin (VAMP8), SNAP-25, and syntaxin 1a (or orthologs thereof).


A protein complex that possesses UDP-N-acetylglucosamine-lysosomal-enzyme N-acetylglucosaminephosphotransferase activity; the bovine complex contains disulfide-linked homodimers of 166- and 51-kDa subunits and two identical, noncovalently associated 56-kDa subunits.


endoplasmic reticulum Sec complex

An endoplasmic reticulum membrane-associated complex involved in the translocation of proteins that are targeted to the ER. In yeast, this complex consists of two subcomplexes, namely, the Sec61 complex and the Sec62/Sec63 complex.


CARD8 inflammasome complex

An inflammasome complex that consists of CARD8 and CASP1.


A protein complex that contains the cell adhesion molecules protocadherin-alpha-v4 and protocadherin-gamma-a3, and is involved in the regulation of protein localization to the plasma membrane.


GET complex

An endoplasmic reticulum protein-containing complex that is conserved in eukaryotics and that mediates the insertion of tail-anchored proteins into the ER membrane. In yeast, includes Get1p, Get2p and Get3p proteins.


nitrogenase complex

An enzyme complex composed of two proteins, dinitrogenase and nitrogenase reductase; dinitrogenase is tetrameric with an alpha2-beta2 structure and nitrogenase reductase is a homodimer, and both are associated with metal ions, which differ between species. Both proteins are required for the enzyme activity of the complex, the formation of oxidized ferredoxin and ammonia from reduced ferredoxin and nitrogen.


ferroxidase complex

A protein complex which is capable of ferroxidase activity.


respiratory chain complex III

A protein complex that transfers electrons from ubiquinol to cytochrome c and translocates two protons across a membrane. The complex contains a core structure of three catalytic subunits: cytochrome b, the Rieske iron sulfur protein (ISP), and cytochrome c1, which are arranged in an integral membrane-bound dimeric complex; additional subunits are present, and vary among different species.


dimeric ribonuclease P complex

A ribonuclease P complex that contains a single RNA molecule that is necessary and usually sufficient for catalysis, and a single protein molecule. Examples of this complex are found in Bacterial species.


type III polyketide synthase complex

A polyketide synthase complex that consists of two identical ketosynthase polypeptides.


syntaxin-6-syntaxin-16-Vti1a complex

A SNARE complex that contains syntaxin 6, syntaxin 16, and Vti1a (or orthologs thereof).


mitochondrial ribonuclease P complex

A ribonuclease P complex located in the mitochondrion of a eukaryotic cell, where it catalyzes the 5' endonucleolytic cleavage of precursor tRNAs to yield mature tRNAs. The subunit composition of mitochondrial ribonuclease P complexes varies between species. The complex contains a single RNA molecule and a single protein molecule in yeast (PMID:12045094), but comprises three proteins and lacks an RNA component in humans.


TRAIL death-inducing signaling complex

A protein complex formed upon binding of TRAIL to its ligand. The complex includes FADD/Mort1 and procaspase-8 addition to the ligand-bound receptor.


cytochrome complex

A protein complex in which at least one of the proteins is a cytochrome, i.e. a heme-containing protein involved in catalysis of redox reactions.


short-chain collagen trimer

Any collagen trimer that does not form fibrils and that is relatively short compared to the collagen trimers that do form fibrils.


procollagen-proline 4-dioxygenase complex, alpha(II) type

A procollagen-proline 4-dioxygenase complex that contains alpha subunits of the type II isoform; its activity is inhibited by poly(L-proline) only at high concentrations.


TACC/TOG complex

A protein complex that contains the transforming acidic coiled coil (TACC) protein and the TOG protein (Mia1p/Alp7p and Alp14, respectively, in fission yeast), and is involved in microtubule array remodeling as cells progress through the cell cycle. The TACC/TOG complex is conserved in eukaryotes, associates with microtubules, and shuttles between the nucleus and the cytoplasm during interphase.


DNA ligase IV complex

A eukaryotically conserved protein complex that contains DNA ligase IV and is involved in DNA repair by non-homologous end joining; in addition to the ligase, the complex also contains XRCC4 or a homolog, e.g. Saccharomyces Lif1p.