Polycomb Complex Protein BMI-1 (BMI1) Antibody – Rabbit Polyclonal

This gene encodes a ring finger protein that is major component of the polycomb group complex 1 (PRC1). This complex functions through chromatin remodeling as an essential epigenetic repressor of multiple regulatory genes involved in embryonic development and self-renewal in somatic stem cells. This protein also plays a central role in DNA damage repair. This gene is an oncogene and aberrant expression is associated with numerous cancers and is associated with resistance to certain chemotherapies. A pseudogene of this gene is found on chromosome X. Read-through transcription also exists between this gene and the upstream COMM domain containing 3 (COMMD3) gene. [provided by RefSeq, Sep 2015]

BMI1: 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. Component of a PRC1-like complex. Interacts with RING1 and RING2. Interacts vwith CBX7 and CBX8. Interacts with SPOP. Part of a complex consisting of BMI1, CUL3 and SPOP. Interacts with E4F1.

Protein type: EC 6.3.2.-; Ligase; Motility/polarity/chemotaxis; Oncoprotein; Ubiquitin conjugating system; Ubiquitin ligase

Chromosomal Location of Human Ortholog: 10p12.2

Cellular Component: nucleoplasm; nucleus; PcG protein complex; ubiquitin ligase complex

Molecular Function: protein binding; zinc ion binding

Biological Process: hemopoiesis; negative regulation of gene expression, epigenetic; negative regulation of transcription from RNA polymerase II promoter; positive regulation of fibroblast proliferation; positive regulation of ubiquitin-protein ligase activity; protein sumoylation; regulation of gene expression; segment specification