Component of the Polycomb group (PcG) multiprotein PRC1 complex, a complex 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.
B lymphoma Mo-MLV insertion region 1; B lymphoma Mo-MLV insertion region 1 homolog; BMI1 polycomb ring finger oncogene; BMI1 polycomb ring finger proto-oncogene; flvi-2/bmi-1; FLVI2/BMI1; murine leukemia viral (bmi-1) oncogene homolog; PCGF4; Polycomb complex protein BMI-1; polycomb group protein Bmi1; polycomb group ring finger 4; Polycomb group RING finger protein 4; ring finger protein 51; RNF51
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