UniProt Summary: Component of the SIN3-repressing complex. Enhances the ability of SIN3-HDAC1-mediated transcriptional repression. When tethered to the promoter, it can direct the formation of a repressive complex to core histone proteins. Auxiliary component of the splicing-dependent multiprotein exon junction complex (EJC) deposited at splice junction on mRNAs. The EJC is a dynamic structure consisting of core proteins and several peripheral nuclear and cytoplasmic associated factors that join the complex only transiently either during EJC assembly or during subsequent mRNA metabolism. Component of the ASAP and PSAP complexes which bind RNA in a sequence-independent manner and are proposed to be recruited to the EJC prior to or during the splicing process and to regulate specific excision of introns in specific transcription subsets. The ASAP complex can inhibit mRNA processing during in vitro splicing reactions. The ASAP complex promotes apoptosis and is disassembled after induction of apoptosis. Involved in the splicing modulation of BCL2L1/Bcl-X (and probably other apoptotic genes); specifically inhibits the formation of proapoptotic isoforms such as Bcl-X(S); the activity is different from the established EJC assembly and function. {ECO:0000269|PubMed:12665594, ECO:0000269|PubMed:20966198, ECO:0000269|PubMed:22203037, ECO:0000269|PubMed:9150135}.
Pfam DomainsGO Terms
Pfam Domains
SAP18
GO Terms
ASAP complex
negative regulation of mRNA splicing, via spliceosome
exon-exon junction complex
negative regulation of RNA splicing
negative regulation of mRNA processing
histone deacetylase complex
regulation of alternative mRNA splicing, via spliceosome
negative regulation of mRNA metabolic process
regulation of mRNA splicing, via spliceosome
regulation of RNA splicing
regulation of mRNA processing
transcription corepressor activity
nuclear body
regulation of mRNA metabolic process
RNA splicing
nuclear speck
mRNA processing
positive regulation of apoptotic process
positive regulation of programmed cell death
mRNA metabolic process
positive regulation of cell death
RNA processing
negative regulation of nucleic acid-templated transcription
negative regulation of RNA biosynthetic process
negative regulation of RNA metabolic process
RNA binding
negative regulation of nucleobase-containing compound metabolic process
negative regulation of macromolecule biosynthetic process
negative regulation of cellular biosynthetic process
regulation of apoptotic process
negative regulation of biosynthetic process
regulation of programmed cell death
RNA metabolic process
regulation of cell death
negative regulation of gene expression
gene expression
CRISPR Data
Compound HitMost Correlated Genes in ChemogenomicsTissues where Essential in the Avana Dataset (DepMap 20Q1)