FEATURES

FAMILY

class V-like SAM-binding methyltransferase superfamily

DESCRIPTION

Also known as SET1B_HUMAN, SETD1B, KIAA1076, KMT2G, SET1B. Histone methyltransferase that specifically methylates 'Lys-4' of histone H3, when part of the SET1 histone methyltransferase (HMT) complex, but not if the neighboring 'Lys-9' residue is already methylated. H3 'Lys-4' methylation represents a specific tag for epigenetic transcriptional activation. The non-overlapping localization with SETD1A suggests that SETD1A and SETD1B make non-redundant contributions to the epigenetic control of chromatin structure and gene expression. Specifically tri-methylates 'Lys-4' of histone H3 in vitro. Component of the SET1 complex, at least composed of the catalytic subunit (SETD1A or SETD1B), WDR5, WDR82, RBBP5, ASH2L/ASH2, CXXC1/CFP1, HCFC1 and DPY30. Interacts with HCFC1 and ASH2L/ASH2. Interacts (via the RRM domain) with WDR82. Interacts (via the RRM domain) with hyperphosphorylated C-terminal domain (CTD) of RNA polymerase II large subunit (POLR2A) only in the presence of WDR82. Binds specifically to CTD heptad repeats phosphorylated on 'Ser-5' of each heptad. Interacts with RBM15. Interacts (via WIN motif) with WDR5 (PubMed:22665483, PubMed:22266653).

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EXTERNAL LINKS

SETD1B

Histone-lysine N-methyltransferase SETD1B

ligandability Mutations

SETD1B

Molecular Synopsis