Holliday junction helicase complex

A DNA helicase complex found at Holliday junctions where the helicase activity is involved in the migration of the junction branch point. The best-characterized example is the E. coli RuvAB complex, in which a hexamer of RuvB subunits possesses helicase activity that is modulated by association with RuvA.


methylthiol:coenzyme M methyltransferase complex

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A protein complex of two polypeptides which catalyzes the transfer of methyl group from methylthiol to coenzyme M during methanogenesis.


U2AF complex

A heterodimeric protein complex consisting of conserved large and small U2AF subunits that contributes to spliceosomal RNA splicing by binding to consensus sequences at the 3' splice site. U2AF is required to stabilize the association of the U2 snRNP with the branch point.


laminin-9 complex

A laminin complex composed of alpha4, beta2 and gamma1 polypeptide chains.


ionotropic glutamate receptor complex

A multimeric assembly of four or five subunits which form a structure with an extracellular N-terminus and a large loop that together form the ligand binding domain. The C-terminus is intracellular. The ionotropic glutamate receptor complex itself acts as a ligand-gated ion channel; on binding glutamate, charged ions pass through a channel in the center of the receptor complex.


sucrase-isomaltase complex

A protein complex that possesses oligo-1,6-glucosidase activity; the complex is a heterodimer located in the cell membrane, and is formed by proteolytic cleavage of a single precursor polypeptide. The two subunits have different substrate specificities.


NOXA-BCL-2 complex

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


H-NS-Cnu complex

A trimeric protein complex containing a H-NS homodimer and a Cnu monomer. In bacteria, this complex negatively regulates transcription of a range of genes.


Cbp3p-Cbp6 complex

A protein complex located at the mitochondrial ribosome tunnel exit that is involved in efficient translation and protein complex assembly.


glutamate decarboxylase complex

A protein complex which is capable of glutamate decarboxylase activity.


interleukin-5 receptor complex

A protein complex that binds interleukin-3; comprises an alpha and a beta subunit. The alpha chain is specific to the interleukin-5 receptor, whereas the beta chain is shared with the receptors for granulocyte-macrophage colony-stimulating factor and interleukin-3.


mitochondrial intermembrane space protein transporter complex

Soluble complex of the mitochondrial intermembrane space composed of various combinations of small Tim proteins; acts as a protein transporter to guide proteins to the Tim22 complex for insertion into the mitochondrial inner membrane.


sulfate adenylyltransferase complex (ATP)

An enzyme complex that catalyzes the formation adenylylsulfate from sulfate and ATP.


molybdopterin synthase complex

A protein complex that possesses molybdopterin synthase activity. In E. coli, the complex is a heterotetramer consisting of two MoaD and two MoaE subunits.


S100A8 complex

A protein complex composed of a S100A8 dimer and capable of binding to toll-like receptor 4 (TLR4).


RNA polymerase V transcription repressor complex

A protein complex, located in the nucleus, that possesses activity that prevents or downregulates transcription from a RNA polymerase V promoter.


COPI vesicle coat

One of two multimeric complexes that forms a membrane vesicle coat. The mammalian COPI subunits are called alpha-, beta-, beta'-, gamma-, delta-, epsilon- and zeta-COP. Vesicles with COPI coats are found associated with Golgi membranes at steady state.


A protein complex capable of protein N-acetylglucosaminyltransferase activity, the addition of nucleotide-activated sugars onto the polypeptide according to reaction: UDP-N-acetyl-D-glucosamine + protein = UDP + 4-N-(N-acetyl-D-glucosaminyl)-protein. The complex has different compositions in different species: In mammals it is often a homotrimer, in bacteria a heterotetramer of 2 different subunits.


retroviral intasome

A tetramer of retroviral integrase subunits tightly associated with a pair of viral DNA ends. Functions to insert viral DNA into a host cell chromosome.


PKM2 pyruvate kinase complex

A protein complex capable of pyruvate kinase activity. PKM2 only exists as homotetramer when bound to beta-d-fructofuranose 1,6-bisphosphate (CHEBI:28013).


Noc4p-Nop14p complex

A heterodimer associated with precursors of the eukaryotic small ribosomal subunit, including the 90S preribosome; involved in small subunit biogenesis.


glucosidase complex

A protein complex which is capable of glucosidase activity.


cytosolic tRNA wobble base thiouridylase complex

A complex of two proteins involved in the thiolation of uridine 34 (U34) of tRNAs decoding two-family box triplets.


ecdysone receptor holocomplex

A heterodimeric complex containing the products of the insect genes Ecdysone receptor (EcR) and ultraspiracle (usp). Binding of ecdysone promotes association between the two subunits, and the receptor complex then initiates molting and metamorphosis by binding DNA and regulating the transcription of target genes.


alpha6-beta4 integrin-CD9 complex

A protein complex that consists of an alpha6-beta4 integrin complex bound to the cell surface protein CD9.


CENP-T-W-S-X complex

A histone-variant containing protein complex which forms a centromere specific nucleosome-like structure, involved in centromeric chromatin organization.


BAT3 complex

A protein complex found in mammals that transfers tail-anchored (TA) proteins from SGTA to GET3 (ASNA1/TRC4) for targeting to the endoplasmic reticulum membrane. Also chaperones polypeptides from the endoplasmic reticulum retrotranslocation machinery to the proteasome, maintaining the solubility of substrates to improve ER-associated protein degradation (ERAD). Consists of BAG6 (BAT3) and its cofactors GET4 (TRC35) and UBL4A.


transporter complex

A protein complex facilitating transport of molecules (proteins, small molecules, nucleic acids) into, out of or within a cell, or between cells.


IKKalpha-IKKalpha complex

A homodimeric protein complex containing two IkappaB kinase (IKK) alpha subunits.


respiratory chain complex II

A part of the respiratory chain, containing the four polypeptide subunits of succinate dehydrogenase, flavin-adenine dinucleotide and iron-sulfur. Catalyzes the oxidation of succinate by ubiquinone. Connects the TCA cycle with the respiratory chain.


plasma membrane-derived thylakoid photosystem II

A protein complex, located in the membrane-derived thylakoid, containing the P680 reaction center. In the light, PSII functions as a water-plastoquinone oxidoreductase, transferring electrons from water to plastoquinone.


myosin VII complex

A myosin complex containing a dimer of class VII myosin heavy chains and associated light chains. Myosin VII (240 kDa) is predicted to be a dimeric molecule with 5 IQ motifs and a tail region with a short stretch of coiled coil followed by two myosin-tail homology (MyTH4) domains, two talin-binding (FERM) domains and an SH3-domain.


translation initiation complex

A ribonucleoprotein complex that contains a ribosome, mRNA, and initiator tRNA; the functional ribosome is at the AUG, with the methionyl/formyl-methionyl-tRNA positioned at the P site.


mRNA cap methyltransferase complex

A protein complex that consists of an RNA 5' triphosphatase and a guanyl transferase (Cet1p and Ceg1p in S. cerevisiae; Pct1 and Ceg1 in S. pombe) and is involved in mRNA capping.


protein complex involved in cell-cell adhesion

Any protein complex that is capable of carrying out some part of the process of cell-cell adhesion.


inhibin B complex

Heterodimeric hormone composed of an inhibin alpha subunit complexed with an inhibin beta-B subunit.


IRE1-TRAF2-ASK1 complex

A protein complex of the endoplasmic reticulum membrane that consists of IRE1 (Inositol-requiring enzyme-1), TRAF2 (TNF receptor-associated factor 2) and ASK1 (Apoptosis signal-regulating kinase 1, a MAP3K).


PTEN phosphatase complex

A phospholipid phosphatase complex that catalyses the hydrolysis of the second messenger PtdIns (3,4,5)P3. Will also dephosphorylate PtdIns(3,4)P2, PtdIns3P, and Ins(1,3,4,5)P4. Dimerization is critical for its lipid phosphatase function.


A protein complex that is involved in the transfer of the second mannose to the glycosylphosphatidylinositol (GPI) during GPI precursor assembly. In yeast S. cerevisiae this complex consists of GPI18p and PGA1p.


core primosome complex

A protein-DNA complex containing at least one DNA helicase and one primase. Can also contain associated proteins. The helicase component continues to unwind the double-stranded DNA (dsDNA) and the primase component synthesizes a RNA primer during initiation or restart of replication.


collagen type VI trimer

A collagen heterotrimer containing type VI alpha chains in alpha1(VI)alpha2(VI)alpha3(VI) trimers; type VI collagen triple helices associate to form beaded fibrils.


An enzyme complex that catalyzes the dehydrogenation of sn-glycerol 3-phosphate to form glycerone phosphate.


chloride channel complex

An ion channel complex through which chloride ions pass.


ATR-ATRIP complex

A protein complex that contains the protein kinase ATR and ATR-interacting protein (ATRIP) and binds single-stranded DNA; ssDNA binding affinity is increased in the presence of replication protein A.


proteasome activator complex

A multisubunit complex that activates the hydrolysis of small nonubiquitinated peptides by binding to the proteasome core complex.


A protein complex that consists of an alphaV-beta3 integrin complex bound to the cell surface protein CD47 and the low-affinity immunoglobulin epsilon Fc receptor (FCER2).


STING complex

A protein dimer containing two STING monomers. It binds cyclic purine di-nucleotides. Activation of the sting complex by 2',5'-3'-5'-cyclic GMP-AMP activates nuclear transcription factor kB (NF-kB) and interferon regulatory factor 3 (IRF3) which then induce transcription of the genes encoding type I IFN and cytokines active in the innate immune response.


PRC1 complex

A multiprotein complex that mediates monoubiquitination of lysine residues of histone H2A (lysine-118 in Drosophila or lysine-119 in mammals). The complex is required for stable long-term maintenance of transcriptionally repressed states and is involved in chromatin remodeling.


EMILIN complex

Glycoprotein complex of the C1q/TNF superfamily found in the extracellular matrix (ECM) where it is an important component of the elastic fiber system. A homotrimer that will combine to form supramolecular EMILIN structures.


iRhom2/ADAM17 sheddase complex

A complex consisting of ADAM17 in complex with regulatory iRhoms and FERM domain containing proteins.


EDS1 disease-resistance complex

A plant complex involved in basal disease resistance and resistance (R) gene-mediated effector triggered immunity (ETI). Regulates accumulation of the hormone salicylic acid (SA) which is a necessary component of systemic immunity. Involved in responds to bacteria, viruses and oomycetes.


Smp focus

A DNA-binding ribonucleoprotein complex that contains a lncRNA complementary to the bound chromosomal locus and is involved in the tethering homologous chromosomes together during chromosome pairing at meiotic prophase I.


actin cytoskeleton-regulatory complex

A protein complex probably required for the internalization of endosomes during actin-coupled endocytosis. Links the site of endocytosis to the cell membrane-associated actin cytoskeleton, coordinating ARP2/3 stimulation at the later stages of endocytosis. Present in the late endocytic coat.


dosage compensation complex

A protein or protein-RNA complex that localizes to one or more of the sex chromosome(s), where it acts to normalize transcription between different sexes.


acetyl-CoA decarbonylase/synthase-carbon monoxide dehydrogenase complex

A multifunctional enzyme complex composed of five different polypeptides that catalyzes the decarbonylation of acetyl-CoA, cleaves the C-C and C-S bonds in the acetyl moiety of acetyl-CoA, oxidizes the carbonyl group to CO2 and transfers the methyl group to tetrahydrosarcinapterin. These reactions are important for methanogenesis.


eRF1 methyltransferase complex

A protein complex required for the methylation of a glutamine (Gln) residue in the protein release factor eRF1. In S. cerevisiae, this complex consists of at least Trm112p and Mtq2p.


insulin control element activator complex

Transcription factor complex that binds to the insulin control element (ICE), a DNA sequence element found within the 5'-flanking region of the insulin gene, and activates ICE-mediated transcription.


DNA polymerase V complex

A DNA polymerase complex that contains two UmuD' and one UmuC subunits, and acts in translesion DNA synthesis.


TORC1 complex

A protein complex that contains at least TOR (target of rapamycin) and Raptor (regulatory-associated protein of TOR), or orthologs of, in complex with other signaling components. Mediates the phosphorylation and activation of S6K. In Saccharomyces, the complex contains Kog1p, Lst8p, Tco89p, and either Tor1p or Tor2p.


protein-lipid complex

A macromolecular complex containing separate protein and lipid molecules. Separate in this context means not covalently bound to each other.


PSI associated light-harvesting complex I, LHCIb subcomplex

A pigment protein complex that forms part of the photosystem I associated light-harvesting complex I; contains two proteins (usually about 20 kDa); has a fluorescence maximum of 730 nm.


euchromatin

A dispersed and relatively uncompacted form of chromatin that is in a transcription-competent conformation.


invertasome

A complex formed by a recombinase, a regulatory protein, and the DNA sequences bound by each protein; catalyzes a reversible site-specific recombination reaction that results in the alternate expression of one or more genes in various contexts.


viral integration complex

A nucleoprotein complex containing viral genetic material and the viral integrase, required for genome integration into the host's genome. May contain other proteins.


G-protein beta/gamma-Raf-1 complex

A protein complex formed by the association of the serine-threonine protein kinase Raf-1 with the beta and gamma subunits of a heterotrimeric G protein.


MECO complex

A highly stable complex composed of the ATAC complex and the mediator complex (also called TRAP or MED). MECO binds and regulates the transcription of a subset of non-coding RNAs transcribed by RNA polymerase II.


DNA polymerase III, clamp loader complex

A heptamer that includes the tau and gamma products of the dnaX gene and the chi/psi subcomplex. Confers structural asymmetry that allows the polymerase to replicate both leading and lagging strands.


mannan polymerase II complex

A complex with alpha-(1->6)-mannosyltransferase activity, located in the cis Golgi membrane; adds mannan to N-linked glycans on proteins as part of the elongation of alpha 1,6-linked Man backbone. In S. cerevisiae, contains Mnn9p, Anp1p, Mnn10p, Mnn11p, and Hoc1p.


endoplasmic reticulum protein-containing complex

A protein complex that is part of an endoplasmic reticulum.


mRNA editing complex

A protein complex that posttranscriptionally catalyzes insertion, deletion or substitution of nucleotides at multiple sites within nascent mRNA transcripts to produce mature mRNAs in eukaryotes.


Tpg-containing telomere binding complex

A complex composed of four polypeptides, a telomere-protecting terminal protein (Tpg), a telomere-associated protein (Tap), DNA polymerase (PolA) and topoisomerase I (TopA), that functions in the replication of the telomeric regions of linear chromosomes, plasmids and circular replicons of some bacterial species.


metallochaperone complex

A protein complex which is capable of metallochaperone activity.


Cdc24p-Far1p-Gbetagamma complex

A complex that forms at the cell cortex in response to pheromone treatment and is required for the polarized growth of haploid yeast cells towards a mating partner during yeast mating. In the yeast Saccharomyces cerevisiae, this complex consists of Cdc24p, Far1p, Ste4p (G-protein beta subunit) and Ste18p (G-protein gamma subunit).


ferritin complex

A protein complex that binds iron and acts as a major iron storage system. Intracellular and extracellular ferritin complexes have different ratios of two types of ferritin monomer, the L (light) chain and H (heavy) chain.


ubiquinone biosynthesis complex

The cytosolic ubiquinone biosynthesis complex is composed of enzymes and accessory factors of the ubiquinone biosynthesis pathway and enables synthesis of the extremely hydrophobic molecule ubiquinone. In E. coli, the complex is composed of seven proteins: UbiE, F, G, H, I, J and K.


acyl-CoA ceramide synthase complex

A protein complex that catalyzes the reaction acyl-CoA + sphingosine = CoA + N-acylsphingosine. In S. cerevisiae it contains three subunits: lag1, lac1 and lip1.


cation-transporting ATPase complex

Protein complex that carries out the reaction: ATP + H2O + cation(out) = ADP + phosphate + cation(in).


A protein complex that consists of an alpha5-beta1 integrin complex bound to osteopontin.


GAIT complex

A protein complex which mediates interferon-gamma-induced transcript-selective translation inhibition in inflammation processes. The complex binds to stem loop-containing GAIT elements in the 3'-UTR of diverse inflammatory mRNAs and suppresses their translation by blocking the recruitment of the 43S ribosomal complex to m7G cap-bound eIF4G. In humans it includes RPL13A, EPRS, SYNCRIP and GAPDH; mouse complexes lack SYNCRIP.


A protein complex that contains the cell adhesion molecules protocadherin-alpha-v4 and protocadherin-gamma-b4, and is involved in the regulation of protein localization to the plasma membrane.


PAK family kinase-Sog2 complex

A protein kinase complex comprising a conserved PAK/GC/Ste20 family kinase, leucine rich repeat protein Sog2 family, which function as part of the cell shape network.


A transcription factor TFIIIB-beta complex that contains the TATA-binding protein (TBP), B'' and BRF, and is involved in the regulation of transcription from type 2 RNA polymerase III promoters.


Sm-like protein family complex

A protein complex containing members of the Like-Sm family of proteins, which includes both the Sm proteins and the Lsm proteins, and which generally form hexameric or heptameric ring structures which bind to RNA. While some of these ring complexes may form independently of RNA, many only form in association with their target RNA. In addition to Lsm-family proteins, many of these complexes contain additional protein members. Members of this family of complexes include the snRNPs which comprise the majority of the spliceosome. Others are involved in the 5' to 3' degradation pathways of mRNAs in the cytoplasm and of unspliced transcripts in the nucleus, as well as other diverse roles.


proteasome regulatory particle

A multisubunit complex, which caps one or both ends of the proteasome core complex. This complex recognizes and unfolds ubiquitinated proteins, and translocates them to the proteasome core complex.


Nicalin-NOMO complex

A protein complex regulating Nodal signaling. Subunits are highly conserved in vertebrates and include Nicalin, NOMO and TMEM147.


PET complex

A protein complex that is composed of at least EXD1, TDRD12 and some PIWI protein. The complex is required for MILI slicing-triggered biogenesis and loading of MIWI2 piRNAs.


MAML3-RBP-Jkappa-ICN2 complex

A protein complex that consists of the intracellular domain of Notch2 (ICN2), the DNA-binding transcription factor RBP-Jkappa, and the transcriptional coactivator Mastermind-like-3 (MAML3); the complex is involved in transcriptional activation in response to Notch-mediated signaling.


muscle thin filament tropomyosin

A form of the tropomyosin dimer found associated with actin and the troponin complex in muscle thin filaments.


integrin alphav-beta3 complex

An integrin complex that comprises one alphav subunit and one beta3 subunit.


GABA receptor complex

A protein complex which is capable of GABA receptor activity. Upon binding of gamma-aminobutyric acid (GABA) it transmits the signal from one side of the membrane to the other to initiate a change in cell activity. Major inhibitory receptor in vertebrate brain. Also found in other vertebrate tissues, invertebrates and possibly in plants. Effective benzodiazepine receptor.


plasma membrane fumarate reductase complex

A membrane-bound flavoenzyme complex consisting of four subunits, A, B, C, and D. A and B comprise the membrane-extrinsic catalytic domain and C (InterPro:IPR003510; InterPro:IPR00224) and D (InterPro:IPR003418) link the catalytic centers to the electron-transport chain. In some species, the complex has only three subunits, and in these cases, there is only one membrane anchor instead of two. This family consists of the 13 kDa hydrophobic subunit D. This component may be required to anchor the catalytic components of the fumarate reductase complex to the cytoplasmic membrane. Fumarate reductase couples the reduction of fumarate to succinate to the oxidation of quinol to quinone, in a reaction opposite to that catalyzed by the related complex II of the respiratory chain (succinate dehydrogenase-(ubiquinone)). Examples of this component are found in bacterial species.


complement component C1 complex

A protein complex composed of six subunits of C1q, each formed of the three homologous polypeptide chains C1QA, C1QB, and C1QB, and tetramer of two C1QR and two C1QS polypeptide chains.


TEAD-YAP complex

A transcription factor complex that is composed of the one DNA binding protein of the TEAD family and the transcriptional coactivator YAP.


MAML2-RBP-Jkappa-ICN1 complex

A protein complex that consists of the intracellular domain of Notch1 (ICN1), the DNA-binding transcription factor RBP-Jkappa, and the transcriptional coactivator Mastermind-like-2 (MAML2); the complex is involved in transcriptional activation in response to Notch-mediated signaling.


DNA replication factor A complex

A conserved heterotrimeric complex that binds nonspecifically to single-stranded DNA and is required for multiple processes in eukaryotic DNA metabolism, including DNA replication, DNA repair, and recombination. In all eukaryotic organisms examined the complex is composed of subunits of approximately 70, 30, and 14 kDa.


collagen type XIX trimer

A collagen homotrimer of alpha1(XIX) chains; type XIX collagen triple helices localize to basement membrane zones in differentiating muscle cells.


MWP complex

A protein ternary complex that anchors microtubule minus ends to mitotic spindle pole bodies. The founding complex contains a microtubule anchoring protein (Msd1 in fission yeast), A WD-repeat Wdr8 family protein and and a minus end-directed kinesin.


type III protein secretion system complex

A complex of approximately 20 proteins, most of which are located in the cytoplasmic membrane that carries out protein secretion in the bacterial type III secretion system; type III secretion also requires a cytoplasmic, probably membrane-associated ATPase.


collagen type XV trimer

A collagen homotrimer of alpha1(XV) chains; a chondroitin sulfate proteoglycan often found in specialized basement membranes where it bridges between fibrils.


pentameric IgM immunoglobulin complex

A circulating form of IgM consisting of a pentamer of IgM core units with a single J chain polypeptide.


Swi5-Sfr1 complex

A conserved DNA recombinase mediator complex that contains two Swi5 monomers and one Sfr1 monomer in Schizosaccharomyces, or orthologs thereof (e.g. Sae3p and Mei5p in Saccharomyces).


nuclear pore inner ring

A subcomplex of the nuclear pore complex (NPC) that forms the inner rings of the core scaffold, a lattice-like structure that gives the NPC its shape and strength. In S. cerevisiae, the two inner rings are each composed of Nup192p, Nup188p, Nup170p and Nup157p. In vertebrates, the two inner rings are each composed of Nup205, Nup188 and Nup155. Components are arranged in 8-fold symmetrical 'spokes' around the central transport channel. A single 'spoke', can be isolated and is sometimes referred to as the Nup170 complex.


immunoglobulin complex

A protein complex that in its canonical form is composed of two identical immunoglobulin heavy chains and two identical immunoglobulin light chains, held together by disulfide bonds and sometimes complexed with additional proteins. An immunoglobulin complex may be embedded in the plasma membrane or present in the extracellular space, in mucosal areas or other tissues, or circulating in the blood or lymph.


DUBm complex

A protein complex that forms part of SAGA-type complexes SAGA and SLIK, and mediates deubiquitination of histone H2B. In S. cerevisiae, the DUBm consists of the proteins Ubp8p, Sgf11p, Sus1p, and Sgf73p.


enzyme IIA-maltose transporter complex

A protein complex consisting of the pentameric maltose transporter complex bound to two enzyme IIA (EIIA) molecules. EIIA is a component of the glucose-specific phosphotransferase system that inhibits maltose transport from the periplasm to the cytoplasm. When EIIA-bound, the maltose transporter remains in the open, inward-facing conformation, which prevents binding of maltose-loaded maltose binding protein (MBP) to the transporter.


lysosomal HOPS complex

Any HOPS complex that is part of a lysosomal membrane.


mannan polymerase complex

A protein complex with alpha-(1->6)-mannosyltransferase activity, located in the cis Golgi membrane; adds mannan to N-linked glycans on proteins.


IgA immunoglobulin complex

A protein complex composed of two identical immunoglobulin heavy chains of the IgA isotype and two identical immunoglobulin light chains, held together by disulfide bonds, and sometimes complexed with J chain or J chain and secretory component. An IgA immunoglobulin complex may be embedded in the plasma membrane or present in the extracellular space, in mucosal areas or other tissues, or circulating in the blood or lymph.


oxidoreductase complex

Any protein complex that possesses oxidoreductase activity.


A multiprotein complex that forms a strong mechanical link between the cytoskeleton and extracellular matrix; typical of, but not confined to, muscle cells. The complex is composed of transmembrane, cytoplasmic, and extracellular proteins, including dystrophin, sarcoglycans, dystroglycan, dystrobrevins, syntrophins, sarcospan, caveolin-3, and NO synthase.


Sec62/Sec63 complex

A protein complex involved in the posttranslational targeting of proteins to the ER. In yeast, it is a tetrameric complex consisting of Sec62p, Sec63p, Sec71p and Sec72p.


polarisome

Protein complex that plays a role in determining cell polarity by directing the localized assembly of actin filaments at polarization sites; in Saccharomyces the polarisome includes Bni1p, Spa2p, Pea2p, and Bud6p.


interleukin-10 receptor complex

A protein complex that binds interleukin-10 (IL-10) and that consists of, at a minimum, a dimeric interleukin, an alpha and a beta chain as well as optional additional kinase subunits. The alpha chain binds IL-10 with high affinity and subsequently binds the common beta receptor chain that forms part of multiple interleukin receptors.


katanin complex

A complex possessing an activity that couples ATP hydrolysis to the severing of microtubules; usually a heterodimer comprising a catalytic subunit (often 60kDa) and a regulatory subunit (often 80 kDa).


subtelomeric heterochromatin

Heterochromatin that is located adjacent to the telomere, and characterized by methylated H3 histone at lysine 9 (H3K9me2/H3K9me3).


alphaV-beta3 integrin-gelsolin complex

A protein complex that consists of an alphaV-beta3 integrin complex bound to gelsolin.


viral terminase, small subunit

The part of the viral terminase complex that acts as a phage DNA-recognition component and regulates the activity of the large subunit. The small subunit usually assembles as a heterooligomer with the large subunit.


BIM-BCL-xl complex

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


beta-N-acetylhexosaminidase complex

A protein complex which is capable of beta-N-acetylhexosaminidase activity.


procentriole replication complex

A protein complex that acts as a chaperone or scaffold for centriolar proteins during the maturation of the procentriole. Some of its members may become integrated into the growing centriole. Examples are the CPAP(CENPJ)-STIL complex, CEP192-PLK4 complex or CEP152-PLK4 complex in vertebrates.


platelet-derived growth factor receptor-ligand complex

A tetrameric protein complex consisting of two platelet-derived growth factor (PDGF) receptor subunits and two PDGF ligand subunits. Binding of the PDGF ligand dimer to the PDGF receptor in the plasma membrane induces receptor dimerization and activation. PDGFs are involved in a wide variety of signaling processes and are found in all vertebrates. At least two different receptor chains (A and B) and four types of ligand chains (A, B, C, and D) are known forming a wide variety of combinations of receptor-ligand complexes.


creatine kinase complex

A protein complex having creatine kinase activity.


Gemin6-Gemin7-unrip complex

A protein complex that contains Gemin6, Gemin7, and unrip (STRAP), and can bind to snRNAs; may play a role in snRNP assembly.


ADPG pyrophosphorylase complex

Complex that possesses ADPG pyrophosphorylase activity. In all organisms where it has been found, the complex is a tetramer. In bacteria, it is a homotetramer. In plants, the complex is a heterotetramer composed small and large subunits.


ESCRT-0 complex

A protein complex required for the recycling of Golgi proteins, formation of lumenal membranes and sorting of ubiquitinated proteins into those membranes. This complex includes Vps1p and Hse1p in yeast and the Hrs and STAM proteins in mammals.


PDX1-PBX1b-MRG1 complex

A protein complex that contains the homeodomain proteins PDX1, PBX1b and MRG1 (MEIS2) and is involved in the transcriptional regulation of pancreatic acinar cell-specific genes.


ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing

A complex for the transport of metabolites into the cell, consisting of 5 subunits: two ATP-binding subunits, two membrane spanning subunits, and one substrate-binding subunit. In organisms with two membranes, the substrate-binding protein moves freely in the periplasmic space and joins the other subunits only when bound with substrate. In organisms with only one membrane the substrate-binding protein is tethered to the cytoplasmic membrane and associated with the other subunits. Transport of the substrate across the membrane is driven by the hydrolysis of ATP.


CRLF-CLCF1 complex

A heterodimeric protein complex that is composed of cardiotrophin-like cytokine factor 1 (product of the CLCF1 gene) and cytokine receptor-like factor 1 (product of the CRLF gene) and is secreted into the extracellular space. The CRLF-CLCF1 complex is a ligand for the ciliary neurotrophic factor (CNTF) receptor complex.


calcium- and calmodulin-dependent protein kinase complex

An enzyme complex which in eukaryotes is composed of four different chains: alpha, beta, gamma, and delta. The different isoforms assemble into homo- or heteromultimeric holoenzymes composed of 8 to 12 subunits. Catalyzes the phosphorylation of proteins to O-phosphoproteins.


MUB1-RAD6-UBR2 ubiquitin ligase complex

A ubiquitin ligase complex consisting of MUB1, RAD6 and UBR2 components. It ubiquitinates, and targets for destruction, the RPN4 transcription factor, which upregulates the proteasome genes. The binding of MUB1 may position the RPN4 ubiquitylation site proximal to the Ubiquitin-RAD6 thioester and allow the transfer of Ubiquitin from RAD6 to RPN4. One of its components, MUB1, is a short-lived protein ubiquitinated by the UBR2-RAD6 ubiquitin conjugating enzyme.


SUMO activating enzyme complex

A conserved heterodimeric complex with SUMO activating enzyme activity.


SUMO ligase complex

A protein ligase complex that enables protein sumoylation. Consists of a SUMO-protein transferase and other proteins that may confer substrate specificity of the complex.


interferon regulatory factor 7 complex

An interferon regulatory factor complex that consists of a homodimer of interferon regulatory factor 7.


messenger ribonucleoprotein complex

A ribonucleoprotein complex containing both protein and messenger RNA (mRNA) molecules.


CUE1-UBC7 ubiquitin-conjugating enzyme complex

A protein complex capable of ubiquitin-conjugating enzyme activity during ER-associated protein degradation (ERAD). In S. cerevisiae, UBC7 is the ubiquitin-conjugating enzyme (E2) and requires binding to the ER surface by CUE1.


U6 snRNP

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


tRNA (m1A) methyltransferase complex

A protein complex involved in the catalysis of the formation of the modified nucleotide 1-methyladenosine (m1A) in tRNA. In yeast, it is a heterotetramer of two subunits, Gcd10p and Gcd14p, while in bacteria and archaea it is a homotetramer.


Mei2 nuclear dot complex

A ribonucleoprotein complex that forms during meiotic prophase in a fixed position in the horsetail nucleus; contains Mei2 and meiRNA. May play a role in the progression of meiosis I.


Parkin-FBXW7-Cul1 ubiquitin ligase complex

A ubiquitin ligase complex containing Parkin (PARK2), the F-box protein FBXW7 (also called SEL-10) and a cullin from the Cul1 subfamily; substrate specificity is conferred by the F-box protein.


U1 snRNP

A ribonucleoprotein complex that contains small nuclear RNA U1, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U1 snRNP, most of which remain associated with the U1 snRNA both while the U1 snRNP is free or assembled into a series of spliceosomal complexes.


FHL2-CREB complex

A protein complex that contains CREB and FHL2, and is involved in transcriptional regulation.


type VI protein secretion system complex

A complex of proteins that permits the transfer of proteins into the extracellular milieu or directly into host cells via the type VI secretion system. Proteins secreted by this complex do not require an N-terminal signal sequence.


transcription factor TFIIE complex

A transcription factor which in humans consists of a complex of two alpha and two beta chains. Recruits TFIIH to the initiation complex and helps activate both RNA polymerase II and TFIIH.


nitric-oxide synthase complex

A protein complex which is capable of nitric-oxide synthase activity.


THO complex part of transcription export complex

The THO complex when it is part of the TREX (TRanscription EXport) complex that is involved in coupling transcription to export of mRNAs to the cytoplasm. In S. cerevisiae, it is composed of four subunits: Hpr1, Tho2, Thp1, and Mft1, while the human complex is composed of 7 subunits.


large latent transforming growth factor-beta complex

A protein complex containing latency-associated proteins (LAPs), mature disulphide-linked dimeric TGF-beta, and latent TGF-beta binding proteins (LTBPs). TGF-beta is mostly secreted as part of the large latent complex, and must be subsequently released from the LLC in order to bind to cell surface receptors.


inhibin A complex

Heterodimeric hormone composed of an inhibin alpha subunit complexed with an inhibin beta-A subunit.


pyroptosome complex

A protein complex that consists of an assemble of ASC dimers that is capable of inducing pyroptosis.


Ost-alpha/Ost-beta complex

A heterodimeric protein complex composed of Ost-alpha/SLC51A and Ost-beta/SLC51B subunits and involved in bile acid transport activity.


rDNA heterochromatin

A region of heterochromatin located at the rDNA repeats in a chromosome.


alphav-beta3 integrin-PKCalpha complex

A protein complex that consists of an alphav-beta3 integrin complex bound to protein kinase C alpha.


cytosolic proteasome core complex

The core complex of a proteasome located in the cytosol of a cell.


ethanolamine ammonia-lyase complex

An enzyme complex that catalyzes the breakdown of ethanolamine to form acetaldehyde and ammonia.


VRK3/VHR/ERK complex

A ternary complex consisting of VRK3, VHR (Dusp3), and ERK1 (Mapk3) existing in neuronal cells, and is involved in regulation of the ERK signaling pathway.


tRNA (m7G46) methyltransferase complex

A protein complex involved in the catalysis of the formation of the modified nucleotide 7-methylguanine (at position 46 in certain tRNAs, such as tRNA(phe) and tRNA(met). In yeast, it is a heterotetramer of two subunits, Trm8 (catalytic) and Trm82 (WD repeat).


Ric1-Rgp1 guanyl-nucleotide exchange factor complex

A protein complex that acts as a nucleotide exchange factor for the GTPase Ypt6p, and is required for fusion of endosome-derived vesicles with the Golgi.


cytosolic proteasome regulatory particle, lid subcomplex

The subcomplex of the cytosolic proteasome regulatory particle that forms the peripheral lid, which is added on top of the base subcomplex.


transcription factor AP-1 complex

A heterodimeric transcription factor complex composed of proteins from the c-Fos, c-Jun, activating transcription factor (ATF) or JDP families. The subunits contain a basic leucine zipper (bZIP) domain that is essential for dimerization and DNA binding. Jun-Fos heterodimers bind preferentially to a heptamer consensus sequence (TPA responsive element (TRE)), whereas Jun-ATF dimers bind the cyclic AMP responsive element (CRE) to regulate transcription of target genes.


Gemin3-Gemin4-Gemin5 complex

A protein complex that contains Gemin3 (DDX20), Gemin4, and Gemin5, and can bind to snRNAs; may be an intermediate in SMN complex assembly.


dimeric IgA immunoglobulin complex

A protein complex composed of two monomeric IgA immunoglobulin complexes linked through both direct disulfide bonds and through a disulfide binded monomer of J chain acting as a bridge. Each IgA monomer consists of two identical immunoglobulin heavy chains of an IgA isotype and two identical immunoglobulin light chains, held together by disulfide bonds. Dimeric IgA is sometimes complexed additionally with secretory component, and present in the extracellular space, in mucosal areas or other tissues, or circulating in the blood or lymph.


DNA polymerase III, clamp loader chi/psi subcomplex

A dimer composed of the chi and psi subunits which is a subassembly of the DNA polymerase III clamp loader complex and serves as a bridge between the DnaX complex and the single-stranded DNA-binding protein (SSB).


transcription repressor complex

A protein complex that possesses activity that prevents or downregulates transcription.


decaprenyl diphosphate synthase complex

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


IscS-IscU complex

A heterotetrameric protein complex involved in the sulfur transfer during iron-sulfur cluster assembly and in the modification of tRNA wobble positions. In E. coli it consisting of a central IscS dimer with the IscU protomers attached to one of the IscS units each via a disulfide (-SSH) group.


B cell receptor complex

An immunoglobulin complex that is present in the plasma membrane of B cells and that in its canonical form is composed of two identical immunoglobulin heavy chains and two identical immunoglobulin light chains and a signaling subunit, a heterodimer of the Ig-alpha and Ig-beta proteins.


box H/ACA scaRNP complex

A box H/ACA RNP complex that is located in the Cajal body of the nucleoplasm. In higher eukaryotes, box H/ACA RNP located in Cajal bodies mediate pseudouridylation of spliceosomal snRNAs.


alpha4-beta1 integrin-JAM2 complex

A protein complex that consists of an alpha4-beta1 integrin complex bound to the cell adhesion molecule JAM2.


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

A procollagen-proline 4-dioxygenase complex that contains alpha subunits of the type I isoform; its activity is readily inhibited by poly(L-proline).


U11 snRNP

A ribonucleoprotein complex that contains small nuclear RNA U11, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U11 snRNP, most of which remain associated with the U11 snRNA both while the U11 snRNP is free or assembled into a series of spliceosomal complexes.


alpha7-beta1 integrin-laminin alpha-2 complex

A protein complex that consists of an alpha7-beta1 integrin complex bound to laminin alpha-2.


polyphosphate kinase complex

A protein complex that possesses polyphosphate kinase activity.


cytosolic isocitrate dehydrogenase complex (NAD+)

Cytosolic complex that possesses isocitrate dehydrogenase (NAD+) activity.


paraferritin complex

A cytoplasmic protein complex that contains integrin, mobilferrin and a flavin monooxygenase, is capable of reducing Fe(III) to Fe(II) utilizing NADPH, and is involved in iron transport. Fe(II) is required in the cell as the substrate for ferrochelatase in the synthesis of heme.


alpha9-beta1 integrin-ADAM12 complex

A protein complex that consists of an alpha9-beta1 integrin complex bound to the transmembrane metallopeptidase ADAM12.


FtsQBL complex

A protein complex required for prokaryotic cell division (FtsZ-dependent cytokinesis). Part of the divisome. Assembled independently of the other divisome components in the cytoplasm prior to transport to the cell septum. In E. coli consists of FtsB, FtsL and FtsQ.


gamma-delta T cell receptor complex

A T cell receptor complex in which the TCR heterodimer comprises gamma and delta chains, associated with the CD3 complex; recognizes antigen directly, without a requirement for processing and presentation by an MHC protein.


HAUS complex

A protein complex that localizes to interphase centrosomes and to mitotic spindle tubules and regulates mitotic spindle assembly and centrosome integrity; in human, the complex consists of eight subunits, some of which are homologous to subunits of the Drosophila Augmin complex.


bacterial pre-replicative complex

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


taurine dioxygenase complex

A protein complex capable of catalyzing the conversion of taurine and alpha-ketoglutarate to sulfite, aminoacetaldehyde and succinate under sulfur or cysteine starvation conditions. Its expression is repressed by the presence of sulfate or cysteine. In E. coli it is a homodimer or homotetramer of the protein TauD.


TORC2 complex

A protein complex that contains at least TOR (target of rapamycin) and Rictor (rapamycin-insensitive companion of TOR), or orthologs of, in complex with other signaling components. Mediates the phosphorylation and activation of PKB (also called AKT). In Saccharomyces, the complex contains Avo1p, Avo2p, Tsc11p, Lst8p, Bit61p, Slm1p, Slm2p, and Tor2p.


PTEX complex

A protein complex that acts as a protein trafficking machinery and is responsible for the export of proteins across the parasitophorous (symbiont-containing) vacuolar membrane and into the human host cell. The PTEX complex is located in the vacuole membrane. It is ATP-powered, and comprises heat shock protein 101 (HSP101; a ClpA/B-like ATPase from the AAA+ superfamily, of a type commonly associated with protein translocons), a parasite protein termed PTEX150, and exported protein 2 (EXP2). EXP2 is the potential channel, as it is the membrane-associated component of the core PTEX complex. Two other proteins, PTEX88 and thioredoxin 2 (TRX2), were also identified as PTEX components.


MalFGK2 complex

Protein complex involved in maltose transport through the plasma membrane. In E. coli, the complex is a tetramer and consists of a cytoplasmic ATPase MalK homodimer together with a heterodimeric transmembrane subunit MalF-MalG.


TAP complex

A heterodimer composed of the subunits TAP1 and TAP2 (transporter associated with antigen presentation). Functions in the transport of antigenic peptides from the cytosol to the lumen of the endoplasmic reticulum.


collagen type XVIII trimer

A collagen homotrimer of alpha1(XVIII) chains.


fatty acid elongase complex

A tetrameric complex of four different subunits which catalyzes the elongation of a fatty acid chain 2 carbon units at a time in the synthesis of very long chain fatty acids.


nuclear pore transmembrane ring

A subcomplex of the nuclear pore complex (NPC) that spans the nuclear membrane and anchors the NPC to the nuclear envelope. In S. cerevisiae, the transmembrane ring is composed of Pom152p, Pom34p, and Ndc1p. In vertebrates, it is composed of Gp210, Ndc1, and Pom121. Components are arranged in 8-fold symmetrical 'spokes' around the central transport channel. A single 'spoke', can be isolated and is sometime referred to as the Ndc1 complex.


protein-DNA-RNA complex

A macromolecular complex containing protein, DNA, and RNA molecules.


hemoglobin complex

An iron-containing, oxygen carrying complex. In vertebrates it is made up of two pairs of associated globin polypeptide chains, each chain carrying a noncovalently bound heme prosthetic group.


FAL1-SGD1 complex

A protein complex involved in the 18S rRNA biogenesis. In S. cerevisiae this complex consists of Fal1p and Sgd1p and in humans this complex consists of NOM1 and eIF4AIII subunits.


interferon regulatory factor 3 complex

An interferon regulatory factor complex that consists of a homodimer of interferon regulatory factor 3.


CHOP-C/EBP complex

A heterodimeric protein complex that is composed of the transcription factor CHOP (GADD153) and a member of the C/EBP family of transcription factors.


interleukin-1 receptor complex

A protein complex that binds interleukin-1; comprises an alpha and a beta subunit.


RPAP3/R2TP/prefoldin-like complex

A protein complex first characterized in human and comprised of a R2TP module (R2TP complex), a prefoldin-like module (containing both prefoldin-like proteins and canonical prefoldins), WD40 repeat protein Monad/WDR92 and DNA-dependent RNA polymerase subunit RPB5. This complex might have chaperone activity.


high-affinity iron permease complex

A protein complex composed of a multicopper ferroxidase that oxidizes Fe(II) to Fe(III), and a ferric iron permease that transports the produced Fe(III) into the cell. In high-affinity transport the transporter is able to bind the solute even if it is only present at very low concentrations.


alpha4-beta1 integrin-CD82 complex

A protein complex that consists of an alpha4-beta1 integrin complex bound to membrane protein CD82, a member of the tetraspan family.


type V protein secretion system complex

A complex of proteins that permits the translocation of proteins across the outer membrane via a transmembrane pore, formed by a beta-barrel, into the extracellular milieu or directly into host cells; the secreted proteins contain all the information required for translocation of an effector molecule through the cell envelope. The type V secretion systems includes the autotransporters (type Va), the two-partner secretion system (type Vb) and the Oca family (type Vc).


extracellular ferritin complex

A ferritin complex located in the extracellular region. Extracellular ferritin complexes contain L (light) chains but few or no H (heavy) chains.


MIM complex

A large mitochondrial outer membrane translocase complex that mediates transport of proteins into mitochondrial compartments. MIM constitutes the major integration site for alpha-helical embedded proteins. In yeast, consists oof Mim1 and Mim2.


Yae1-Lto1 complex

A cytosolic complex that functions as an substrate-specific adaptor, linking the cytosolic iron-sulfur protein assembly (CIA) targeting complex to apo-Rli1p, an ABC protein involved in ribosome recycling, facilitating Fe-S cluster insertion and the maturation of the Rli1p.


cellular bud neck polarisome

Protein complex that has a role in determining cell polarity, found at the neck of a fungal bud before and during cytokinesis.


U5 snRNP

A ribonucleoprotein complex that contains small nuclear RNA U5, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U5 snRNP, most of which remain associated with the U5 snRNA both while the U5 snRNP is free or assembled into a series of spliceosomal complexes.


SCF-Ctf13 ubiquitin ligase complex

An SCF ubiquitin ligase complex in which the F-box protein is Ctf13 in S. cerevisiae.


cysteine synthase complex

Cysteine synthase is a multienzyme complex made up, in E. coli, of the heteromeric hexamer serine acetyltransferase and the homodimer O-acetylserine (thiol)-lyase A.


transcription factor TFIIIC2 complex

A transcription factor complex that forms part of the TFIIIC complex, observed in human; composed of five subunits (GTF3C1/hTFIIIC220/TFIIICalpha, GTF3C2/hTFIIIC110/TFIIICbeta, GTF3C3/hTFIIIC102/TFIIICgamma, GTF3C4/hTFIIIC90/TFIIICdelta and GTF3C5/hTFIIIC63/TFIIICepsilon in human) that together recognize the type 2 RNA polymerase III promoter.


SCF-Ucc1 ubiquitin ligase complex

An SCF ubiquitin ligase complex in which the F-box protein is YLR224W in S. cerevisiae.


myosin IX complex

A myosin complex containing a class IX myosin heavy chain and associated light chains. Myosin IX is monomeric with a motor domain containing an N-terminal extension and an insert in the actin binding interface, followed by four to six IQ motifs and a tail region that contains a zinc binding motif and a domain with homology to GTPase activating proteins (GAPs) of the Rho family of G-proteins.


translation preinitiation complex

A ribonucleoprotein complex that contains the small ribosomal subunit, a translation initiation ternary complex (i.e. an initiator tRNA, GTP, and an IF2 or eIF2 complex), and an mRNA.


Sid2-Mob1 complex

A protein complex that contains a protein kinase (Sid2 in S. pombe) and its regulatory subunit (Mob1). The Sid2p-Mob1p kinase complex is a component of the septation initiation network in fission yeast (called the mitotic exit network in S. cerevisiae) and is required for cytokinesis. The analogous complex in S. cerevisiae is called Dbf2p-Mob1p complex.


clathrin coat of coated pit

The coat found on coated pits and the coated vesicles derived from coated pits; comprises clathrin and the AP-2 adaptor complex.


primosome complex

Any of a family of protein complexes that form at the origin of replication or stalled replication forks and function in replication primer synthesis in all organisms. Early complexes initiate double-stranded DNA unwinding. The core unit consists of a replicative helicase and a primase. The helicase further unwinds the DNA and recruits the polymerase machinery. The primase synthesizes RNA primers that act as templates for complementary stand replication by the polymerase machinery. The primosome contains a number of associated proteins and protein complexes and contributes to the processes of replication initiation, lagging strand elongation, and replication restart.


formyl-methanofuran dehydrogenase (tungsten enzyme) complex

A protein complex consisting of four polypeptides which also contains tungsten, a molybdopterin guanine dinucleotide, and iron-sulfur clusters. This protein complex catalyzes the reversible conversion of CO2 and methanofuran to formylmethanofuran during methanogenesis.


sodium ion-transporting F-type ATPase complex

A sodium ion-transporting two-sector ATPase complex that catalyzes the phosphorylation of ADP to ATP. 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.


MICOS complex

Mitochondrial inner membrane complex involved in maintenance of crista junctions, inner membrane architecture, and formation of contact sites to the outer membrane. In Saccharomyces cerevisiae the complex has six subunits: MIC10, MIC12, MIC19, MIC26, MIC27, and MIC60.


nuclear protein-containing complex

A stable assembly of two or more macromolecules, i.e. proteins, nucleic acids, carbohydrates or lipids, in which at least one component is a protein and the constituent parts function together in the nucleus.


GARP complex

A quatrefoil tethering complex required for retrograde traffic from the early endosome back to the late Golgi and biogenesis of cytoplasmic vesicles.


succinate-CoA ligase complex

A heterodimeric enzyme complex, usually composed of an alpha and beta chain. Functions in the TCA cycle, hydrolyzing succinyl-CoA into succinate and CoA, thereby forming ATP or GTP.


collagen type XIII trimer

A collagen homotrimer of alpha1(XIII) chains; type XIII collagen triple helices span the plasma membrane.


H-NS-Hha complex

A trimeric protein complex made up of an H-NS homodimer and an Hha monomer. In Enterobacteriaceae, this complex negatively regulates transcription of a range of genes.


G protein-coupled receptor homodimeric complex

A protein complex that contains two G protein-coupled receptors (GPCRs) of the same subtype. Formation of a GPCR homodimer may be important for the transport of newly formed receptors to the cell surface, and the function of the receptor.


outer kinetochore

The region of a kinetochore most external to centromeric DNA; this outer region mediates kinetochore-microtubule interactions.


Slx1-Slx4 complex

A heterodimeric protein complex that possesses an endonuclease activity that specifically cleaves certain types of branched DNA structures; because such structures often form during the replication ribosomal DNA (rDNA) repeats, the complex plays a role in the maintenance of rDNA. The subunits are known as Slx1 and Slx 4 in budding and fission yeasts, and are conserved in eukaryotes.


silver ion transmembrane transporter complex

A protein complex which is capable of silver ion transmembrane transporter activity.


alphaM-beta2 integrin-CD63 complex

A protein complex that consists of an alphaM-beta2 integrin complex bound to membrane protein CD63, a member of the tetraspan family.


transcription factor TFIIH core complex

The 7 subunit core of TFIIH that is a part of either the general transcription factor holo-TFIIH or the nucleotide-excision repair factor 3 complex. In S. cerevisiae/humans the complex is composed of: Ssl2/XPB, Tfb1/p62, Tfb2/p52, Ssl1/p44, Tfb4/p34, Tfb5/p8 and Rad3/XPD.


SAM complex

A large complex of the mitochondrial outer membrane that mediates sorting of some imported proteins to the outer membrane and their assembly in the membrane; functions after import of incoming proteins by the mitochondrial outer membrane translocase complex.


alphaIIb-beta3 integrin-fibronectin-tissue transglutaminase complex

A protein complex that consists of an alphaIIb-beta3 integrin complex bound to fibronectin and tissue transglutaminase.


SCF-Rcy1/Pof6 ubiquitin ligase complex

An SCF ubiquitin ligase complex in which the F-box protein is Rcy1 in S. cerevisiae (Pof6 in S. pombe).


plasma membrane respiratory chain complex II

A part of the respiratory chain located in the plasma membrane, containing the four polypeptide subunits of succinate dehydrogenase, flavin-adenine dinucleotide and iron-sulfur. Catalyzes the oxidation of succinate by ubiquinone. Connects the TCA cycle with the respiratory chain. Examples of this component are found in bacterial species.


mCRD-mediated mRNA stability complex

A protein complex that binds to, and promotes stabilization of, mRNA molecules containing the major coding region instability determinant (mCRD) by bridging the mCRD domain and the poly(A) tail of the mRNA. In human, it consists of CSDE1, HNRPD, PABPC1, PAIP1 and SYNCRIP.


plastid large ribosomal subunit

The larger of the two subunits of a plastid ribosome. Two sites on the ribosomal large subunit are involved in translation: the aminoacyl site (A site) and peptidyl site (P site).


A protein complex that contains the cell adhesion molecules protocadherin-alpha-v7 and protocadherin-gamma-b4, and is involved in the regulation of protein localization to the plasma membrane.


viral terminase complex

A complex of a large and small subunit which catalyze the packaging of DNA into viral heads. Note that not all viral terminases have this structure, some exist as single polypeptides.


galectin complex

A homodimeric protein complex that is capable of binding a range of carbohydrates and is involved in anti-inflammatory and pro-apoptotic processes.


nonsense-mediated decay complex

A highly conserved protein complex that recognises and elicits the rapid degradation of mRNAs in which an amino-acid codon has changed to a nonsense codon; occurs when the 3' end is not protected by a 3'-poly(A) tail; degradation proceeds in the 3' to 5' direction.


Complex that catalyzes the synthesis of ADP-glucose and pyrophosphate from glucose-1-phosphate and ATP. In plants, the complex is a heterotetramer composed of two types of subunits (small and large). In bacteria, the enzyme complex is composed of four identical subunits.


IgZ immunoglobulin complex

A protein complex composed of two identical immunoglobulin heavy chains of the IgZ isotype and two identical immunoglobulin light chains, held together by disulfide bonds. The IgZ isotype is also known as the IgT isotype in certain species of fish.


pore complex

A protein complex providing a discrete opening in a membrane that allows the passage of gases and/or liquids.


pre-B cell receptor complex

An immunoglobulin-like complex that is present in at least the plasma membrane of pre-B cells, and that is composed of two identical immunoglobulin heavy chains and two surrogate light chains, each composed of the lambda-5 and VpreB proteins, and a signaling subunit, a heterodimer of the Ig-alpha and Ig-beta proteins.


R2TP complex

A highly conserved protein complex comprised of two ATP-dependent DNA helicases (Rvb1p and Rvb2p in yeast, Pontin52 and Reptin52 in humans), Pih1p in yeast or PIH1D1 in humans, and Tah1 in yeast or RPAP3 in humans. The complex associates with Hsp90 and is thought to have a role in assembly of large protein or protein/nucleic acid complexes. In this role it is involved in multiple processes such as box C/D snoRNP biogenesis, phosphatidylinositol-3 kinase-related protein kinase (PIKK) signaling, RNA polymerase II assembly, and others.


nuclear aryl hydrocarbon receptor complex

An aryl hydrocarbon receptor (AhR) complex found in the nucleus; ; consists of ligand-bound AhR and the aryl hydrocarbon receptor nuclear translocator (ARNT).


calcium ion-transporting ATPase complex

Protein complex that carries out the reaction: ATP + H2O + Ca2+(out) = ADP + phosphate + Ca2+(in).


oligosaccharyltransferase complex

A protein complex that is found in the endoplasmic reticulum membrane of eukaryotes and transfers lipid-linked oligosaccharide precursor to asparagine residues on nascent proteins. In yeast, the complex includes at least nine different subunits, whereas in mammalian cells at least three different forms of the complex have been detected.


CoB-CoM heterodisulfide reductase complex

A protein complex that in Methanobacterium thermoautotrophicum is composed of six subunits, and in Methanosarcina barkeri contains is composed of either two subunits or nine subunits. Catalyzes the conversion of coenzyme B, coenzyme M, and methanophenazine to form N-{7-[(2-sulfoethyl)dithio]heptanoyl}-3-O-phospho-L-threonine and dihydromethanophenazine.


5-lipoxygenase complex

An nuclear membrane protein complex having arachidonate 5-lipoxygenase activity.


NVT complex

A protein complex that is capable of contributing to protein localization by the NVT pathway. In fission yeast, the Nvt complex consists of Ape2, Lap2 and Nbr1.


basal tubulobulbar complex

Actin-based structures involved in establishing the blood-testis barrier of the Sertoli cell.


DnaA-DnaB-DnaC complex

A protein-DNA complex consisting of the helicase loading complex DnaB-DnaC bound to the DNA-bound DNA replication initiation protein DnaA. Essential for DNA replication initiation.


BRCA1-B complex

A protein complex that contains the BRCA1-BARD1 heterodimer, BACH1 and TopBP1, and binds to DNA during S phase at DNA damage sites.


nuclear pre-replicative complex

A protein-DNA complex assembled at eukaryotic DNA replication origins during late mitosis and G1, allowing the origin to become competent, or 'licensed', for replication. The complex normally includes the origin recognition complex (ORC), Cdc6, Cdt1 and the MiniChromosome Maintenance (Mcm2-7) proteins.


A multienzyme, heterooligomeric complex involved in dolichyl-linked oligosaccharide synthesis. In yeast the complex is composed of Alg7p, which catalyzes the first step (GlcNAc1-PP-Dol from dolichol-phosphate and UDP-GlcNAc), and Alg13p plus Alg14p, the catalytic and anchoring subunits respectively, which together catalyze the second step (GlcNAc2-PP-dolichol from GlcNAc1-PP-Dol and UDP-GlcNAc) of dolichyl-linked oligosaccharide synthesis.


collagen type XVII trimer

A collagen homotrimer of alpha1(XVII) chains; type XVII collagen triple helices span the plasma membrane and associate with hemidesmosomes and the basal lamina where they bind laminin.


heparanase complex

A protein complex which is capable of heparanase activity.


signal recognition particle

A complex of protein and RNA which facilitates translocation of proteins across membranes.


Rvs161p-Rvs167p complex

A protein complex that is involved in endocytosis in the yeast S. cerevisiae.


A protein complex that consists of an alpha5-beta1 integrin complex bound to endostatin, the NC1 domain of the alpha1 chain of type XVIII collagen.


Tec1p-Ste12p-Dig1p complex

A multiprotein complex that is involved in the transcriptional regulation of primarily filamentation genes, but also mating genes, in the yeast S. cerevisiae.


Kibra-Ex-Mer complex

An apical protein complex that contains the proteins Kibra, Expanded and Merlin (Mer), or orthologs thereof. In humans, the complex contains KIBRA, FDM6 and NF2.


tRNA-specific adenosine-34 deaminase complex

A protein complex that possesses tRNA-specific adenosine-34 deaminase activity. In eukaryotes the complex is a heterodimer; the subunits are known as Tad2p and Tad3p in yeasts and Adat2 and Adat3 in human.


interleukin-28 receptor complex

A protein complex that binds interleukin-28 and interleukin-29. It is composed of an alpha and a beta receptor subunit (in human IFNLR1/IL28Ralpha & IL10RB) and either Interleukin-28 (IFNL2 or IFNL3) or Interleukin-29 (IFNL1).


integrin alphaX-beta2 complex

An integrin complex that comprises one alphaX subunit and one beta2 subunit.


DNA replication factor C core complex

A protein complex containing three of the five subunits of eukaryotic replication factor C, those corresponding to human p40, p38, and p37.


mitochondrial respiratory chain complex IV

A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. Contains the 13 polypeptide subunits of cytochrome c oxidase, including cytochrome a and cytochrome a3. Catalyzes the oxidation of reduced cytochrome c by dioxygen (O2).


photosystem II antenna complex

The antenna complex of photosystem II. A photosystem has two closely linked components, an antenna containing light-absorbing pigments and a reaction center. Each antenna contains one or more light-harvesting complexes (LHCs).


methylosome

A large (20 S) protein complex that possesses protein arginine methyltransferase activity and modifies specific arginines to dimethylarginines in the arginine- and glycine-rich domains of several spliceosomal Sm proteins, thereby targeting these proteins to the survival of motor neurons (SMN) complex for assembly into small nuclear ribonucleoprotein (snRNP) core particles. Proteins found in the methylosome include the methyltransferase JBP1 (PRMT5), pICln (CLNS1A), MEP50 (WDR77), and unmethylated forms of SM proteins that have RG domains.


XRCC2-RAD51D complex

A heterodimeric DNA recombinase mediator complex that contains the Rad51 paralogs RAD51D and XRCC2, or orthologs thereof; conserved from fission yeast to human but absent from budding yeast.


PSII associated light-harvesting complex II

Protein-pigment complex associated with photosystem II.


G-protein alpha(13)-synembrin complex

A protein complex formed by the association of the guanine nucleotide exchange factor synembrin with the alpha(13) subunit of a heterotrimeric G protein.


ESC/E(Z) complex

A multimeric protein complex that can methylate lysine-27 and lysine-9 residues of histone H3. In Drosophila the core subunits of the complex include ESC, E(Z), CAF1 (NURF-55) and SU(Z)12. In mammals the core subunits of the complex include EED, EZH2, SUZ12 and RBBP4.


alpha3-beta1 integrin-basigin complex

A protein complex that consists of an alpha3-beta1 integrin complex bound to the cell surface protein basigin.


phosphatase complex

A protein complex which is capable of phosphatase activity.


Bam protein complex

Protein complex which is involved in assembly and insertion of beta-barrel proteins into the outer membrane. In E. coli it is composed of BamABCDE, of the outer membrane protein BamA, and four lipoproteins BamB, BamC, BamD and BamE. BamA interacts directly with BamB and the BamCDE subcomplex.


mitochondrial respiratory chain complex I

A protein complex located in the mitochondrial inner membrane that forms part of the mitochondrial respiratory chain. It contains about 25 different polypeptide subunits, including NADH dehydrogenase (ubiquinone), flavin mononucleotide and several different iron-sulfur clusters containing non-heme iron. The iron undergoes oxidation-reduction between Fe(II) and Fe(III), and catalyzes proton translocation linked to the oxidation of NADH by ubiquinone.


SMN complex

A protein complex that contains the survival motor neuron (SMN) protein and at least eight additional integral components, including the Gemin2-8 and Unrip proteins; the complex is found in the cytoplasm and in nuclear Gems, and is involved in spliceosomal snRNP assembly in the cytoplasm and in pre-mRNA splicing in the nucleus.


VCP-NSFL1C complex

A protein complex between the ATPase VCP (p97) and its cofactor p47 (NSFL1C). In human, the protein complex consists of one homotrimer of NSFL1C/p47 per homohexamer of VCP/p97.


MLL1 complex

A protein complex that can methylate lysine-4 of histone H3. MLL1/MLL is the catalytic methyltransferase subunit, and the complex also contains the core components ASH2L, HCFC1/HCF1 WDR5 and RBBP5.


Cul7-RING ubiquitin ligase complex

A ubiquitin ligase complex in which a cullin from the Cul7 subfamily and a RING domain protein form the catalytic core; substrate specificity is conferred by a Skp1 linker and an F-box protein.


troponin complex

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


A protein complex that is part of a mitochondrion.


chromosome passenger complex

A eukaryotically conserved protein complex that localizes to kinetochores in early mitosis, the spindle mid-zone in anaphase B and to the telophase midbody. It has been proposed that the passenger complex coordinates various events based on its location to different structures during the course of mitosis. Complex members include the BIR-domain-containing protein Survivin, Aurora kinase, INCENP and Borealin.


An enzyme complex that catalyzes the reduction of trimethylamine N-oxide to trimethylamine.


junctional membrane complex

Complex formed in muscle cells between the membrane of the sarcoplasmic reticulum and invaginations of the plasma membrane (T-tubules).


Hedgehog signaling complex

A multiprotein complex that binds microtubules in a Hedgehog-dependent manner, and is required for signal transduction by members of the Hedgehog family of proteins. The core components of the complex are the serine/threonine protein kinase Fused, the kinesin motor protein Costal2 (Cos2), and a zinc finger transcription factor (Gli family members in humans, and Cubitus interruptus (Ci) in Drosophila).


PAT complex

A transmembrane protein complex located in the endoplasmic reticulum (ER) involved in the correct folding of multipass membrane proteins in the ER membrane. In human, the substrate-binding Asterix (PAT10, WDR83OS) forms an obligate heterodimer with CCDC47.


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


Wnt-Frizzled-LRP5/6 complex

A protein complex containing a secreted Wnt protein associated with its receptor, Frizzled (Fz), and co-receptor low density lipoprotein receptor-related protein 5 (LRP5) or LRP6.


CIA complex

The cytosolic iron-sulfur protein assembly (CIA) complex mediates the incorporation of iron-sulfur clusters into apoproteins involved in DNA metabolism and genomic integrity.


inhibin-betaglycan-ActRII complex

A protein complex that consists of inhibin, type III transforming growth factor beta receptor (also known as betaglycan), and the type II activin receptor ActRII. The complex is thought to negatively regulate the activity of activin B.


plasma membrane proton-transporting V-type ATPase, V1 domain

The V1 domain of a proton-transporting V-type ATPase found in the plasma membrane.


phenylacetyl-CoA 1,2-epoxidase complex

A protein complex capable of catalysing the reaction: phenylacetyl-CoA + H+ + NADPH + O2 = 2-(1,2-epoxy-1,2-dihydrophenyl)acetyl-CoA + H2O + NADP+.


glucose transporter complex

A protein complex facilitating glucose transport into, out of or within a cell, or between cells.


EKC/KEOPS complex

A protein complex involved in t6A tRNA modification. For example, in Saccharomyces cerevisiae the complex contains Bud32p, Kae1p, Gon7p, Cgi121p, and Pcc1p.


plasma membrane light-harvesting complex

A plasma membrane 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. Examples of this complex are found in bacterial species.


ERMES complex

A protein complex that links the endoplasmic reticulum with mitochondria and may have a role in promoting exchange of calcium and phospholipids between the two organelles.


survivin complex

A protein complex that negatively regulates apoptotic processes. In human, this anti-apoptotic complex is a homodimer of BIRC5 (survivin) and provides one survivin molecule to the chromosomal passenger complex (CPC).


ProVWX complex

The ProVWX complex belongs to the family of ATP-binding cassette (ABC) transporter proteins complexes. It consists of a cytoplasmic ATPase subunit ProV, a transmembrane subunit ProW and a periplasmic binding protein ProX. It is capable of translocating a wide variety of solute (e.g. glycine betaine) across the plasma membrane and is activated under osmotic stress conditions.


CLOCK-BMAL transcription complex

Transcription factor complex which interacts with E-box regulatory elements in target genes, including Period (Per1, Per2, Per3) and Cryptochrome (Cry1, Cry2), to activate their transcription during the daytime. The CRY-PER complexes inhibit CLOCK-BMAL1-driven transcription in a negative feedback loop to generate circadian rhythms.


interleukin-35 complex

A protein complex that is composed of an interleukin-12 alpha subunit (p35, product of the IL12A gene) and an EBI3 subunit and is secreted into the extracellular space.


synaptotagmin-synaptobrevin 2-SNAP-25-syntaxin-1a-syntaxin-1b-Rab3a-complexin II complex

A SNARE complex that contains synaptotagmin, synaptobrevin 2 (VAMP2), SNAP-25, syntaxin 1a, syntaxin1b, Rab3a, and complexin II (or orthologs thereof).


alpha5-beta1 integrin-LPP3 complex

A protein complex that consists of an alpha5-beta1 integrin complex bound to lipid phosphate phosphohydrolase-3.


Doa10p ubiquitin ligase complex

A multiprotein complex that recognizes and ubiquitinates membrane proteins with misfolded cytosolic domains during ER-associated protein degradation (ERAD). In S. cerevisiae, this complex contains the ubiquitin ligase Ssm4p/Doa10p.


nuclear proteasome regulatory particle

The regulatory subcomplex of a proteasome located in the nucleus of a cell.


monoatomic ion channel complex

A protein complex that spans a membrane and forms a water-filled channel across the phospholipid bilayer allowing selective monoatomic ion transport down its electrochemical gradient.


tRNA methyltransferase complex

A multimeric protein complex involved in the methylation of specific nucleotides in tRNA.


chloroplast proton-transporting ATP synthase complex, coupling factor CF(o)

All non-F1 subunits of the chloroplast hydrogen-transporting ATP synthase, including integral and peripheral chloroplast thylakoid membrane proteins.


Rpd3S complex

A eukaryotically conserved histone deacetylase complex which deacetylates histones across gene coding regions. Composed of a catalytic histone deacetylase subunit, a chromodomain protein, a SIN3 family co-repressor, and a WD repeat protein (Clr6p, Alp13p, Pst2p, and Prw1p respectively in Schizosaccharomyces; Rpd3p, Sin3p, Ume1p, Rco1p and Eaf3 in Saccharomyces; homologs thereof in other species).


A SNARE complex that contains synaptobrevin 2 (VAMP2), SNAP-25, and syntaxin 4 (or orthologs thereof).


mannosyltransferase complex

A complex that posseses mannosyltransferase activity.


light-harvesting complex, core complex

Light harvesting complex associated with the reaction complex of photosynthetic purple bacteria.


BAD-BCL-xl complex

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


dolichyl-phosphate-mannose-protein mannosyltransferase Pmt5p-Pmt2p dimer complex

A protein dimer complex that possesses dolichyl-phosphate-mannose-protein mannosyltransferase activity and, in S. cerevisiae, is composed of Pmt5p-Pmt2p.


mitotic checkpoint complex, CDC20-MAD2 subcomplex

A protein complex involved in the spindle checkpoint, preventing the activation of the anaphase-promoting complex until all chromosomes are correctly attached in a bipolar fashion to the mitotic spindle. In budding yeast this complex consists of Mad2p and Cdc20p, and in mammalian cells it consists of MAD2 and CDC20.


myosin phosphatase complex

An enzyme complex that catalyzes the removal of the phosphate group from phosphomyosin. Composed of a PP1 catalytic subunit (PP1c/PPP1CB) and a myosin phosphatase targeting subunit (MYPT1/PPP1R12A).


tubulin folding cofactor complex

A multimeric protein complex involved in tubulin alpha-beta-subunit folding assembly consisting of beta-tubulin-TFC-D, alpha-tubulin-TFC-E and TFC-C, through which tubulin subunit association and dimer release occur.


eukaryotic translation initiation factor 2B complex

A multisubunit guanine nucleotide exchange factor which catalyzes the exchange of GDP bound to initiation factor eIF2 for GTP, generating active eIF2-GTP. In humans, it is composed of five subunits, alpha, beta, delta, gamma and epsilon.


tRNA-intron endonuclease complex

A protein complex that catalyzes the endonucleolytic cleavage of pre-tRNA, producing 5'-hydroxyl and 2',3'-cyclic phosphate termini, and specifically removing the intron.


glutamate synthase complex

A complex that possesses glutamate synthase activity.


sarcosine oxidase complex

A complex consisting of 4 protein subunits as a heterotetramer, that possesses sarcosine oxidase activity.


Shc-Grb2-Sos complex

A protein complex that contains Grb2, the adaptor protein Shc 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.


BCL-2 complex

A homodimeric protein complex consisting of BCL-2, a member of the Bcl-2 family of anti- and proapoptotic regulators.


integrin alpha7-beta1 complex

An integrin complex that comprises one alpha7 subunit and one beta1 subunit.


SMAD protein complex

A protein complex that consists of only SMAD proteins; may be homomeric or heteromeric. Heteromeric complexes act as transcription factors while homomeric complexes exist but are transcriptionally inactive. Hetero- versus homotrimerization is largely enthalpy driven.


light-harvesting complex, peripheral complex

Bacteriochlorophyll a binding complex that is peripherally associated to the bacterial reaction center.


ferredoxin hydrogenase complex

An enzyme complex that catalyzes the oxidation of reduced ferredoxin. Hydrogenase contains iron-sulfur clusters, and some contain nickel; it can use molecular hydrogen for the reduction of a variety of substances.


centralspindlin complex

A heterotetrameric protein complex playing a key role in the formation of the central spindle in mitosis. Made up of two molecules each of a mitotic kinesin (ZEN-4 in Caenorhabditis elegans or MKLP1 in mammals) and of two molecules each of a GTPase activating protein (GAP) factor (CYK-4 in Caenorhabditis elegans or MgcRacGAP in mammals).


spectrin

Membrane associated dimeric protein (240 and 220 kDa) of erythrocytes. Forms a complex with ankyrin, actin and probably other components of the membrane cytoskeleton, so that there is a mesh of proteins underlying the plasma membrane, potentially restricting the lateral mobility of integral proteins.


low-density lipoprotein receptor complex

A plasma membrane protein complex capable of low-density lipoprotein particle receptor activity. It may also bind xenobiotic toxins and deliver them into the cell via endocytosis. While most substrates get degraded via the endosome the receptor is recycled to the plasma membrane. It may also act as a transducer of intracellular signal pathways and often acts in corporation with other cell-surface receptors.


A protein complex that contains the cell adhesion molecules protocadherin-alpha-v7 and protocadherin-gamma-a1, and is involved in the regulation of protein localization to the plasma membrane.


mitochondrial creatine kinase complex

An octomeric protein complex having creatine kinase activity.


alpha,alpha-trehalose-phosphate synthase complex (UDP-forming)

A protein complex that possesses alpha,alpha-trehalose-phosphate synthase (UDP-forming) and trehalose-phosphatase activities, and thus catalyzes two reactions in trehalose biosynthesis. In the complex identified in Saccharomyces, Tps1p has alpha,alpha-trehalose-phosphate synthase (UDP-forming) activity, Tps2p has trehalose 6-phosphate phosphatase activity; Tps3p is a regulatory subunit, and an additional subunit, Tsl1p, may be present.


zeta DNA polymerase complex

A heterodimeric DNA polymerase complex that catalyzes error-prone DNA synthesis in contexts such as translesion synthesis and double-stranded break repair. First characterized in Saccharomyces, in which the subunits are Rev3p and Rev7p; a third protein, Rev1p, is often associated with the polymerase dimer.


phycobilisome

Any of the granules, approximately 32 nm x 48 nm and consisting of highly aggregated phycobiliproteins, that are attached in arrays to the external face of a thylakoid membrane in algae of the phyla Cyanophyta and Rhodophyta, where they function as light-harvesting devices in photosynthesis. Excitation energy in the phycobilisome flows in the sequence: phycoerythrin, phycocyanin, allophycocyanin before passing to the antenna chlorophyll of photosystem II.


Complex that possesses imidazoleglycerol-phosphate synthase activity.


cytosolic electron transfer flavoprotein complex

A protein complex located in the cytosol containing flavin adenine dinucleotide (FAD) that, together with an acyl-CoA dehydrogenase, forms a system that oxidizes an acyl-CoA molecule and reduces ubiquinone and other acceptors.


galectin lattice

A non-stoichiometric protein complex formed by several galectins crosslinking glycosylated ligands to form a dynamic lattice. The galectin lattice modulates receptor kinase signaling and the functionality of membrane receptors, by regulating the diffusion, compartmentalization and endocytosis of plasma membrane glycoproteins and glycolipids.


transferase complex

A protein complex capable of catalyzing the transfer of a group, e.g. a methyl group, glycosyl group, acyl group, phosphorus-containing, or other groups, from one compound (generally regarded as the donor) to another compound (generally regarded as the acceptor).


exon-exon junction subcomplex mago-y14

Component of the core exon-exon-junction complex (EJC). Fairly conserved in eukaryotes; in Drosophila, consists of the Mago and Y14 (tsunagi) gene products. Important for coupling nuclear and cytoplasmic events in gene expression. Inhibits the ATPase activity of eIF4AIII (Q9VHS8) to ensure a stable association of the EJC core with the mRNA.


sheet-forming collagen trimer

A protein complex consisting of three collagen chains assembled into a left-handed triple helix. These trimers assemble into a sheet.


Knl1/Spc105 complex

A kinetochore subcomplex that binds to centromeric chromatin and forms part of the outer kinetochore. It helps to recruit outer kinetochore subunits that will bind to microtubules. In humans and yeast respectively, it consists of KNL1/Spc105p and ZWINT/Kre28p.


protein complex involved in cell adhesion

Any protein complex that is capable of carrying out some part of the process of cell adhesion to the cell matrix or to another cell.


DNA methyltransferase complex

A protein complex that possesses DNA methyltransferase activity.


UBC13-UEV1A complex

A heterodimeric ubiquitin conjugating enzyme complex that catalyzes assembly of K63-linked polyubiquitin chains and is involved in NF-kappaB activation. In humans at least, the complex comprises the ubiquitin-conjugating enzyme UBC13 and ubiquitin-conjugating enzyme variant 1A (UEV1A).


Cdc50p-Drs2p complex

A protein complex that functions as a phospholipid-translocating P-Type ATPase. In budding yeast, this complex consists of Cdc50p and Drs2p proteins, and is involved in the trafficking of transport vesicles between the late Golgi and the early endosome.


tubulobulbar complex

Actin-based structures involved in establishing close contact between Sertoli-Sertoli cells or Sertoli-spermatids in the seminiferous tubules of the testes.


nuclear SCF ubiquitin ligase complex

A ubiquitin ligase complex, located in the nucleus, 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).


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

A procollagen-proline 4-dioxygenase complex that contains alpha subunits of the type III isoform.


core mediator complex

A protein complex that interacts with the carboxy-terminal domain of the largest subunit of RNA polymerase II and plays an active role in transducing the signal from a transcription factor to the transcriptional machinery. The core mediator complex has a stimulatory effect on basal transcription, and contains most of the same subdomains as the larger form of mediator complex -- a head domain comprising proteins known in Saccharomyces as Srb2, -4, and -5, Med6, -8, and -11, and Rox3 proteins; a middle domain comprising Med1, -4, and -7, Nut1 and -2, Cse2, Rgr1, Soh1, and Srb7 proteins; and a tail consisting of Gal11p, Med2p, Pgd1p, and Sin4p -- but lacks the regulatory subcomplex comprising Ssn2, -3, and -8, and Srb8 proteins. Metazoan core mediator complexes have similar modular structures and include homologs of yeast Srb and Med proteins.


SUMO-targeted ubiquitin ligase complex

A nuclear ubiquitin ligase complex that specifically targets SUMOylated proteins; the complex is formed of homodimers or heterodimers of RNF4 family ubiquitin ligases and is conserved in eukaryotes.


nuclear origin of replication recognition complex

A multisubunit complex that is located at the replication origins of a chromosome in the nucleus.


sodium ion-transporting V-type ATPase complex

A sodium ion-transporting two-sector ATPase complex that couples ATP hydrolysis to the transport of sodium ions across a concentration gradient. The complex comprises a membrane sector (V0) that carries out proton transport and a cytoplasmic compartment sector (V1) that catalyzes ATP hydrolysis.


Las1 complex

A four subunit complex, that comprises all the necessary RNA processing enzymes (endonuclease, polynucleotide kinase, and exonuclease) to mediate 'cistronic rRNA transcript ITS2 (internal transcribed spacer) cleavage' (GO:0000448).


laminin-6 complex

A laminin complex composed of alpha3, beta1 and gamma1 polypeptide chains.


mitochondrial pyruvate dehydrogenase complex

Complex that carries out the oxidative decarboxylation of pyruvate to form acetyl-CoA in eukaryotes; includes subunits possessing three catalytic activities: pyruvate dehydrogenase (E1), dihydrolipoamide S-acetyltransferase (E2), and dihydrolipoamide dehydrogenase (E3). The This Eukaryotic form usually contains more subunits than its bacterial counterpart; for example, one known complex contains 30 E1 dimers, 60 E2 monomers, and 6 E3 dimers as well as a few copies of pyruvate dehydrogenase kinase and pyruvate dehydrogenase phosphatase.


RNA N6-methyladenosine methyltransferase complex

A RNA methyltransferase complex that catalyzes the post-transcriptional methylation of adenosine to form N6-methyladenosine (m6A). In budding yeast, the MIS complex consists of Mum2p, Ime4p and Slz1p. In vertebrates, the complex consists of METTL3, METTL14 and associated components WTAP, ZC3H13, VIRMA, CBLL1/HAKAI and in some cases of RBM15 (RBM15 or RBM15B).


chloroplast large ribosomal subunit

The large subunit of a ribosome contained within a chloroplast.


RES complex

A protein complex that is required for efficient splicing, and prevents leakage of unspliced pre-mRNAs from the nucleus (named for pre-mRNA REtention and Splicing). In Saccharomyces, the complex consists of Ist3p, Bud13p, and Pml1p.


heteromeric SMAD protein complex

A protein complex composed of SMAD family proteins, a transcription factor complex which binds to the promoters of target genes and recruits co-activators and histone acetyltransferases, facilitating transcription. Phosphorylation of the non-SMAD4 subunit(s) enables binding of SMAD4 to form heteromeric complexes that enter the nucleus to initiate gene transcription. DNA-binding specificity is conferred by other transcription factors binding to SMAD complexes. Interactions with coactivators or corepressors modulate their transcriptional activity. Can be heterotrimeric or heterodimeric.


cytoplasmic U snRNP body

A ribonucleoprotein complex that can be visualized as a focus in the cytoplasm, and contains uridine-rich small nuclear ribonucleoproteins (U snRNPs) and essential snRNP assembly factors. These U bodies are invariably found in association with P bodies.


CURI complex

A protein complex that is involved in the transcription of ribosomal genes. In Saccharomyces this complex consists of Ckb2p, Utp22p, Rrp7p and Ifh1p.


interleukin-13 receptor complex

A protein complex that binds interleukin-13; consists of two chains, interleukin-13 receptor alpha1 chain and interleukin-4 receptor alpha chain.


pyruvate dehydrogenase complex

Complex that carries out the oxidative decarboxylation of pyruvate to form acetyl-CoA; comprises subunits possessing three catalytic activities: pyruvate dehydrogenase (E1), dihydrolipoamide S-acetyltransferase (E2), and dihydrolipoamide dehydrogenase (E3).


DNA polymerase III, core complex

The DNA polymerase III core complex consists of the alpha,epsilon and theta subunits and is carries out the polymerase and the 3'-5' exonuclease proofreading activities.


alphaPDGFR-SHP-2 complex

A protein complex that contains the platelet-derived growth factor alpha receptor (alphaPDGFR; PDGFRA) and the adaptor protein SHP-2, and is involved signaling via the PDGFR signaling pathway.


mitochondrial degradosome

A mitochondrial protein complex with 3' to 5' exoribonuclease activity that participates in intron-independent turnover and processing of mitochondrial transcripts. In humans, the mitochondrial degradosome is a pentameric complex, and in yeast it exists as a heterodimer.


A protein complex that comprises one integrin alphav subunit, one integrin beta5 subunit, and vitronectin.


alpha5-beta1 integrin-fibronectin-tissue transglutaminase complex

A protein complex that consists of an alpha5-beta1 integrin complex bound to fibronectin and tissue transglutaminase.


electron transfer flavoprotein complex

A protein complex facilitating the electron transfer from an acyl-CoA molecule to ubiquinone via its flavin adenine dinucleotide (FAD) cofactor. Usually contains an alpha and a beta subunit and the structural cofactor adenosine monophosphate (AMP). Part of a system that oxidizes an acyl-CoA molecule and reduces ubiquinone and other acceptors in the electron transport system.


single-stranded DNA-dependent ATP-dependent DNA helicase complex

A protein complex that possesses single-stranded DNA-dependent DNA helicase activity.


TAF4B-containing transcription factor TFIID complex

A transcription factor TFIID complex that contains the TBP-associated factor TAF4B (also known as TAFII105 in human), a cell-type-specific variant of TAF4.


radial spoke 2

The radial spoke of each group of radial spokes, whether grouped as triplets or doublets, that is immediately distal to radial spoke 1 (RS1). Radial spoke 2 (RS2), similarly to RS1, is comprised of four domains: 1) a very short base anchored to the A microtubule, 2) an elongaged stalk, 3) a bifurcated neck, and 4) an orthogonal head. The base of RS2 is connected to the tail of the inner dynein arm c.


UBC13-MMS2 complex

A heterodimeric ubiquitin conjugating enzyme complex that catalyzes assembly of K63-linked polyubiquitin chains, which act as a signal to promote error-free DNA postreplication repair; in Saccharomyces the complex comprises Ubc13p and Mms2p.


aspartate carbamoyltransferase complex

A multienzyme complex that catalyzes the formation N-carbamoyl-L-aspartate from carbamoyl phosphate and L-aspartate. It exhibits a variety of architectural organizations, but in all microorganisms the core catalytic component is a homotrimer of approximately 34 kDa polypeptides.


protein phosphatase 4 complex

A protein serine/threonine phosphatase complex formed by the catalytic subunit of protein phosphatase 4 plus one or more regulatory subunits.


A protein complex involved in the disassembly and subsequent reassembly of nucleosomes. It associates with the coding region of transcriptionally active genes where it interacts with the RNA polymerase II and affects its processivity during co-transcriptional RNA processing and maturation. It exists as a functionally independent part of the NuA4 complex.


CENP-A containing chromatin

The specialized chromatin located in the centromeric core region or the entire centromeric region in organisms with point centromeres, which is enriched for CENP-A-containing nucleosomes. This chromatin forms a 3-dimensional structure which provides a platform for kinetochore assembly and microtubule attachment.


retrograde transporter complex, Golgi to ER

Transporter complex that recognises, binds and returns endoplasmic reticulum (ER) resident proteins that have trafficked to Golgi compartments. Targets proteins lacking the HDEL motif recognised by COPI-coated vesicles.


Tapasin-ERp57 complex

Subunit of the MHC class I peptide loading complex (GO:0042824) (=PLC) involved in the assembly of the heavy-chain-beta2-microglobulin dimers of the MHC class I molecules that fold with eight to ten residue peptides in the endoplasmic reticulum. Required for the inhibition of the reduction of the disulfide bonds of the heavy chains and the assembly and stabilization of the PLC, suggesting it may play a structural rather than a catalytic role.


translocon complex

A protein complex that constitutes a specific site of protein translocation across the endoplasmic reticulum, which involves the signal recognition particle receptor. The complex contains a core heterotrimer of alpha, beta and gamma subunits, and may contain additional proteins.


[Ni-Fe] hydrogenase complex

A microbial enzyme complex which contains nickel and iron in its active site. In Acetomicrobium flavidum it is an alpha 2 beta 2 tetramer.


COPII vesicle coat

One of two multimeric complexes that forms a membrane vesicle coat. COPII is best characterized in S. cerevisiae, where the subunits are called Sar1p, Sec13p, Sec31p, Sec23p, and Sec24p. Vesicles with COPII coats are found associated with endoplasmic reticulum (ER) membranes at steady state.


Shc-EGFR complex

A protein complex that contains the epidermal growth factor receptor (EGFR) and the adaptor protein Shc, and is involved in linking EGFR activation to the p21-Ras pathway.


alpha4-beta1 integrin-paxillin complex

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


RNA polymerase III transcription regulator complex

A transcription factor complex that acts at a regulatory region of a gene transcribed by RNA polymerase III.


cytoplasmic origin of replication recognition complex

A multisubunit complex that is located at the replication origins of a chromosome in the cytoplasm.


integrin alphav-beta5 complex

An integrin complex that comprises one alphav subunit and one beta5 subunit.


FACIT collagen trimer

A collagen trimer that associates with collagen fibrils and consists of collagen monomers that contain two or more relatively short triple-helical domains connected by non-triple-helical sequences.


ornithine carbamoyltransferase inhibitor complex

A protein complex which is capable of ornithine carbamoyltransferase inhibitor activity.


box H/ACA RNP complex

A ribonucleoprotein complex that contains an RNA of the box H/ACA type and the four core proteins dyskerin, NOP10, NHP2, and GAR1 (human protein nomenclature). RNA pseudouridylation (isomerization of uridine to pseudouridine) is the major, and most likely the ancestral, function of H/ACA RNPs. Pseudouridylation targets include both large and small ribosomal RNAs (rRNAs), and small nuclear RNA (U2 snRNA). In addition to these catalytic H/ACA RNPs, a less abundant but more diverse class of structural H/ACA RNPs exists, which does not have pseudouridylation activity. These include the vertebrate telomerase RNP complex.


chromatin silencing complex

Any protein complex that mediates changes in chromatin structure that result in transcriptional silencing.


Ragulator complex

A vacuolar membrane-anchored guanine nucleotide exchange factor (GEF) complex for the Rag GTPases (Gtr1-Gtr2 GTPase complex GO:1990131) in TORC1 signaling pathway. In human, Ragulator is comprised of the membrane anchor subunit LAMTOR1 (Meh1p in S. cerevisiae, Lam1 in S. pombe), a GEF subunit LAMTOR2 ( Slm4 in S. cerevisiae , Lam2 in S. pombe ) , LAMTOR3 (no S. cerevisiae ortholog identified, Lam3 in S. pombe) , LAMTOR4 (no S. cerevisiae ortholog identified, Lam4 in S. pombe), and LAMTOR5 (no S. cerevisiae or S. pombe ortholog identified).


collagen type XXII trimer

A collagen homotrimer of alpha1(XXII) chains; type XXII collagen triple helices acts as a cell adhesion ligand for skin epithelial cells and fibroblasts.


DNA ligase III-XRCC1 complex

A protein complex that contains DNA ligase III and XRCC1, and is involved in base excision repair.


GABA-A receptor complex

A protein complex which is capable of GABA-A receptor activity. In human, it is usually composed of either two alpha, two beta and one gamma chain of the GABA-A receptor subunits or 5 chains of the GABA-A receptor subunits rho1-3 (formally known as GABA-C receptor).


viral transcriptional complex

Specific locations and structures in the virus infected cell involved in transcribing the viral genome.


U4 snRNP

A ribonucleoprotein complex that contains small nuclear RNA U4, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U4 snRNP, most of which remain associated with the U4 snRNA both while the U4 snRNP is free or assembled into the U4/U6 snRNP or into a series of spliceosomal complexes.


ciliary neurotrophic factor receptor complex

A protein complex that acts as a receptor for the cytokine ciliary neurotrophic factor (CNTF). In humans the receptor complex is a hexamer composed of two molecules each of CNTF and CNTFR and one molecule each of gp130 and LIFR.


Shu complex

A protein complex involved in error-free DNA post-replication repair (PRR). In Saccharomyces cerevisiae the complex contains Csm2p, Psy3p, Shu1p, and Shu2p.


alpha11-beta1 integrin-collagen type I complex

A protein complex that consists of an alpha11-beta1 integrin complex bound to a type I collagen.


sulfurtransferase complex

A protein complex capable of catalyzing the transfer of sulfur atoms from one compound (donor) to another (acceptor).


radial spoke

Protein complex that links the outer microtubule doublet of a 9+2 type ciliary or flagellar axoneme with the sheath that surrounds the central pair of microtubules. Composed of a stalk that attaches to each doublet microtubule and a globular structure (spoke head) that projects toward the central pair of microtubules.


extracellular exosome complex

A protein complex that is wholly or partially contained within the lumen or membrane of the extracellular vesicular exosome.


alphav-beta3 integrin-collagen alpha3(VI) complex

A protein complex that consists of an alphav-beta3 integrin complex bound to the alpha3 chain of type VI collagen; the integrin binds most strongly to unfolded collagen.


membrane fusion priming complex

A protein complex that primes vacuolar or vesicular membranes for fusion with other intracellular membranes, by promoting the dissociation of cis-SNARE complexes.