BC006133
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UniProt Secondary Accession #
Molecular Weight
102,046 Da
NCBI Official Full Name
Homo sapiens ring finger protein 40, mRNA
UniProt Protein Name
E3 ubiquitin-protein ligase BRE1B
UniProt Synonym Protein Names
95 kDa retinoblastoma-associated protein; RBP95; RING finger protein 40
UniProt Synonym Gene Names
UniProt Entry Name
BRE1B_HUMAN
UniProt Comments for RNF40
RNF40: Component of the RNF20/40 E3 ubiquitin-protein ligase complex that mediates monoubiquitination of 'Lys-120' of histone H2B (H2BK120ub1). H2BK120ub1 gives a specific tag for epigenetic transcriptional activation and is also prerequisite for histone H3 'Lys-4' and 'Lys-79' methylation (H3K4me and H3K79me, respectively). It thereby plays a central role in histone code and gene regulation. The RNF20/40 complex forms a H2B ubiquitin ligase complex in cooperation with the E2 enzyme UBE2A or UBE2B; reports about the cooperation with UBE2E1/UBCH are contradictory. Required for transcriptional activation of Hox genes. Component of the RNF20/40 complex (also known as BRE1 complex) probably composed of 2 copies of RNF20/BRE1A and 2 copies of RNF40/BRE1B. Interacts with UBE2E1/UBCH6. Interacts with RB1 and WAC. Ubiquitously expressed. Expressed at higher level in testis, heart and pancreas, while it is only weakly expressed in lung, skeletal muscle and small intestine. Belongs to the BRE1 family. 3 isoforms of the human protein are produced by alternative splicing.
Protein type: EC 6.3.2.-; EC 6.3.2.19; Ubiquitin ligase; Ligase; Ubiquitin conjugating system
Chromosomal Location of Human Ortholog: 16p11.2-p11.1
Cellular Component: membrane; neuron projection; nucleoplasm; nucleus; ubiquitin ligase complex
Molecular Function: mRNA 3'-UTR binding; protein binding; protein homodimerization activity; ubiquitin protein ligase binding; ubiquitin-protein ligase activity
Biological Process: histone H2B ubiquitination; histone monoubiquitination; regulation of mitotic cell cycle; ubiquitin-dependent protein catabolic process
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Diseases associated with RNF40 cdna clone
Organs/Tissues associated with RNF40 cdna clone
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