Polycomb group protein Asx

UniProtKB accession:  Q9V727

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Non-catalytic component of the polycomb repressive deubiquitinase (PR-DUB) complex, a complex that specifically mediates deubiquitination of histone H2A monoubiquitinated at 'Lys-119' (H2AK118ub1) (PubMed:20436459, PubMed:30258054, PubMed:30639226, PubMed:36180891). Activator of the PR-DUB complex involved in ubiquitin binding and allosteric activation of calypso deubiquitinase activity (PubMed:30639226). PR-DUB does not deubiquitinate monoubiquitinated histone H2B (PubMed:20436459). PR-DUB is required to maintain the transcriptionally repressive state of homeotic genes throughout development (PubMed:20436459). The PR-DUB complex has weak or no activity toward 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains (PubMed:20436459). Atypical Polycomb group protein, which may be involved in both Polycomb group (PcG) and trithorax group (trxG) complexes (PubMed:9477319). PcG and trxG proteins act by forming multiprotein complexes, which are respectively required to maintain the transcriptionally repressive and transcriptionally active state of homeotic genes throughout development (Probable). PcG and trxG protein complexes are not required to initiate repression and activation, but to maintain it during later stages of development (Probable).