histone H3K9me2 methyltransferase activity [GO_0140947]

Catalysis of the reaction: N6,N6-dimethyl-L-lysyl9-[histone H3] + S-adenosyl-L-methionine = H+ + N6,N6,N6-trimethyl-L-lysyl9-[histone H3] + S-adenosyl-L-homocysteine. This reaction is the addition of a single methyl group to the dimethylated lysine residue at position 9 of histone H3, producing histone H3K9me3.
Tags:

histone H3K9me2 methyltransferase activity

ID: GO_0140947

Class

Catalysis of the reaction: N6,N6-dimethyl-L-lysyl9-[histone H3] + S-adenosyl-L-methionine = H+ + N6,N6,N6-trimethyl-L-lysyl9-[histone H3] + S-adenosyl-L-homocysteine. This reaction is the addition of a single methyl group to the dimethylated lysine residue at position 9 of histone H3, producing histone H3K9me3.

Comment: Note that the residue position corresponds to the canonical human H3 histone (UniProtKB:P84243); this residue is conserved across all eukaryotes. Residue 1 is the first residue following removal of the initiating Methionine (Met). Note that each histone is encoded by multiple genes, and sequences may vary across different genes within an organism.

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Classification

Alternative Names

Synonym Scope Reference
histone H3-K9 trimethylation broad synonym
histone H3K9 trimethylation broad synonym
histone H3K9me2 methylase activity exact synonym
histone dimethyl-lysine(H3K9) N-methyltransferase activity (H3-K9 specific) exact synonym