PIAS2: Functions as an E3-type small ubiquitin-like modifier (SUMO) ligase, stabilizing the interaction between UBE2I and the substrate, and as a SUMO-tethering factor. Plays a crucial role as a transcriptional coregulator in various cellular pathways, including the STAT pathway, the p53 pathway and the steroid hormone signaling pathway. The effects of this transcriptional coregulation, transactivation or silencing may vary depending upon the biological context and the PIAS2 isoform studied. However, it seems to be mostly involved in gene silencing. Binds to sumoylated ELK1 and enhances its transcriptional activity by preventing recruitment of HDAC2 by ELK1, thus reversing SUMO-mediated repression of ELK1 transactivation activity. Isoform PIAS2-beta, but not isoform PIAS2-alpha, promotes MDM2 sumoylation. Isoform PIAS2-alpha promotes PARK7 sumoylation. Isoform PIAS2-beta promotes NCOA2 sumoylation more efficiently than isoform PIAS2- alpha. Belongs to the PIAS family. 3 isoforms of the human protein are produced by alternative splicing.
Protein type: SUMO conjugating system; Nuclear receptor co-regulator; EC 6.3.2.-; Transcription, coactivator/corepressor
Cellular Component: nuclear body; PML body; nucleus
Molecular Function: protein domain specific binding; zinc ion binding; coenzyme F420-2 alpha-glutamyl ligase activity; metal ion binding; ribosomal S6-glutamic acid ligase activity; SUMO ligase activity; transcription factor binding; protein binding; DNA binding; androgen receptor binding; UDP-N-acetylmuramoylalanyl-D-glutamyl-2,6-diaminopimelate-D-alanyl-D-alanine ligase activity; ubiquitin protein ligase binding; estrogen receptor binding; coenzyme F420-0 gamma-glutamyl ligase activity; ligase activity; glucocorticoid receptor binding
Biological Process: regulation of transcription from RNA polymerase II promoter; protein sumoylation; regulation of osteoblast differentiation; regulation of transcription, DNA-dependent; transcription, DNA-dependent; positive regulation of transcription, DNA-dependent; negative regulation of transcription factor activity; androgen receptor signaling pathway; positive regulation of transcription from RNA polymerase II promoter; positive regulation of dendrite morphogenesis
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