label: RNA polymerase II C-terminal domain binding
label_lc: rna polymerase ii c-terminal domain binding
description: "Binding to the C-terminal domain (CTD) of the largest subunit of RNA polymerase II. The CTD is comprised of repeats of a heptapeptide with the consensus sequence YSPTSPS. The number of repeats varies with the species and a minimum number of repeats is required for RNAP II function."