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, throughout 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. In the PRC1 complex, it is required to stimulate the E3 ubiquitin-protein ligase activity of RNF2/RING2.
[1]Characterization and chromosomal localization of the human proto-oncogene BMI-1.Alkema M.J., Wiegand J., Raap A.K., Berns A., van Lohuizen M.Hum. Mol. Genet. 2:1597-1603(1993) [2]Complete sequencing and characterization of 21,243 full-length human c