Chromobox protein homolog 7 (CBX7)

Component of a Polycomb group (PcG) multiprotein PRC1- like complex, a complex class required to maintain the transcriptionally repressive state of many genes, including Hox genes, during development. PcG PRC1 complex acts via chromatin remodeling and modification of histones; it mediates monoubiquitination of histone H2A'Lys-119', rendering chromatin heritably changed in its expressibility.

Promotes histone H3 trimethylation in'Lys-9' (H3K9me3). Binds to trimethylated lysine residues in histones, and maybe also other proteins.