Histone-lysine N-methyltransferase SETDB1 - Q15047 (SETB1_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q15047: 15
 
Function
Histone methyltransferase that specifically trimethylates 'Lys-9' of histone H3. H3 'Lys-9' trimethylation represents a specific tag for epigenetic transcriptional repression by recruiting HP1 (CBX1, CBX3 and/or CBX5) proteins to methylated histones. Mainly functions in euchromatin regions, thereby playing a central role in the silencing of euchromatic genes. H3 'Lys-9' trimethylation is coordinated with DNA methylation. Probably forms a complex with MBD1 and ATF7IP that represses transcription and couples DNA methylation and histone 'Lys-9' trimethylation. Its activity is dependent on MBD1 and is heritably maintained through DNA replication by being recruited by CAF-1. SETDB1 is targeted to histone H3 by TRIM28/TIF1B, a factor recruited by KRAB zinc-finger proteins. Probably forms a corepressor complex required for activated KRAS-mediated promoter hypermethylation and transcriptional silencing of tumor suppressor genes (TSGs) or other tumor-related genes in colorectal cancer (CRC) cells (PubMed:24623306). Also required to maintain a transcriptionally repressive state of genes in undifferentiated embryonic stem cells (ESCs) (PubMed:24623306). Associates at promoter regions of tumor suppressor genes (TSGs) leading to their gene silencing (PubMed:24623306). The SETDB1-TRIM28-ZNF274 complex may play a role in recruiting ATRX to the 3'-exons of zinc-finger coding genes with atypical chromatin signatures to establish or maintain/protect H3K9me3 at these transcriptionally active regions (PubMed:27029610). UniProt
Catalytic Activity
S-adenosyl-L-methionine + L-lysine-[histone] = S-adenosyl-L-homocysteine + N6-methyl-L-lysine-[histone]. UniProt
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Subunit Structure
Part of a complex containing at least CDYL, REST, WIZ, SETB1, EHMT1 and EHMT2 (PubMed:19061646). During DNA replication, it is recruited by SETDB1 to form a S phase-specific complex that facilitates methylation of H3 'Lys-9' during replication-coupled chromatin assembly and is at least composed of the CAF-1 subunit CHAF1A, MBD1 and SETDB1 (PubMed:15327775). Probably part of a corepressor complex containing ZNF304, TRIM28, SETDB1 and DNMT1 (PubMed:24623306). Interacts with TRIM28/TIF1B (PubMed:11959841). Interacts with ATF7IP and ATF7IP2; the interaction with ATF7IP is required to stimulate histone methyltransferase activity and facilitate the conversion of dimethylated to trimethylated H3 'Lys-9' (PubMed:14536086, PubMed:15691849). Interacts with MBD1; interaction is abolished when MBD1 is sumoylated (PubMed:15327775, PubMed:17066076). Interacts with CBX1 and CBX5 (PubMed:15899859). Interacts with DNMT3A and DNMT3B (PubMed:16682412). Interacts with SUMO2. Interacts with CHD7, NLK1 and PPARG (PubMed:17952062). Interacts with MPHOSPH8 (PubMed:20871592). Interacts with ERG (By similarity). Interacts with HDAC1, HDAC2, SIN3A and SIN3B (By similarity). Interacts with ATRX. Forms a complex with ATRX, TRIM28 and ZNF274 (PubMed:27029610). UniProt
Domain
In the pre-SET domain, Cys residues bind 3 zinc ions that are arranged in a triangular cluster; some of these Cys residues contribute to the binding of two zinc ions within the cluster. UniProt
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