FEATURES

FAMILY

nucleosome assembly protein (NAP) family

DESCRIPTION

Also known as SET_HUMAN, SET. Multitasking protein, involved in apoptosis, transcription, nucleosome assembly and histone chaperoning. Isoform 2 anti-apoptotic activity is mediated by inhibition of the GZMA-activated DNase, NME1. In the course of cytotoxic T-lymphocyte (CTL)-induced apoptosis, GZMA cleaves SET, disrupting its binding to NME1 and releasing NME1 inhibition. Isoform 1 and isoform 2 are potent inhibitors of protein phosphatase 2A. Isoform 1 and isoform 2 inhibit EP300/CREBBP and PCAF-mediated acetylation of histones (HAT) and nucleosomes, most probably by masking the accessibility of lysines of histones to the acetylases. The predominant target for inhibition is histone H4. HAT inhibition leads to silencing of HAT-dependent transcription and prevents active demethylation of DNA. Both isoforms stimulate DNA replication of the adenovirus genome complexed with viral core proteins; however, isoform 2 specific activity is higher. Headphone-shaped homodimer. Isoforms 1 and 2 interact directly with each other and with ANP32A within the tripartite INHAT (inhibitor of acetyltransferases) complex. Isoform 1 and isoform 2 interact also with histones. Isoform 2 is a component of the SET complex, composed of at least ANP32A, APEX1, HMGB2, NME1, SET and TREX1, but not NME2 or TREX2. Within this complex, directly interacts with ANP32A, NME1, HMGB2 and TREX1; the interaction with ANP32A is enhanced after cleavage. Interacts with APBB1, CHTOP, SETBP1, SGO1.

EXTERNAL LINKS

SET

Protein SET

SET

Molecular Synopsis