Transferases;
Transferring one-carbon groups;
Methyltransferases
BRITE hierarchy

S-adenosyl-L-methionine:[histone H3]-L-lysine4 N6-trimethyltransferase

3 S-adenosyl-L-methionine + a [histone H3]-L-lysine4 = 3 S-adenosyl-L-homocysteine + a [histone H3]-N6,N6,N6-trimethyl-L-lysine4 (overall reaction);
(1a) S-adenosyl-L-methionine + a [histone H3]-L-lysine4 = S-adenosyl-L-homocysteine + a [histone H3]-N6-methyl-L-lysine4;
(1b) S-adenosyl-L-methionine + a [histone H3]-N6-methyl-L-lysine4 = S-adenosyl-L-homocysteine + a [histone H3]-N6,N6-dimethyl-L-lysine4;
(1c) S-adenosyl-L-methionine + a [histone H3]-N6,N6-dimethyl-L-lysine4 = S-adenosyl-L-homocysteine + a [histone H3]-N6,N6,N6-trimethyl-L-lysine4

(other) R03875 R04866 R04867
Reaction

S-adenosyl-L-methionine [CPD:C00019];
[histone H3]-L-lysine4;
[histone H3]-N6-methyl-L-lysine4;
[histone H3]-N6,N6-dimethyl-L-lysine4

This entry describes several enzymes that successively methylate the L-lysine4 residue of histone H3 (H3K4), ultimately generating a trimethylated form. These modifications influence the binding of chromatin-associated proteins. In most cases the trimethylation of this position is associated with gene activation. EC 2.1.1.364, [histone H3]-lysine4 N-methyltransferase, describes enzymes that can catalyse only monomethylation of this substrate (the first sub-reaction of this entry); EC 2.1.1.370, [histone H3]-lysine4 N-dimethyltransferase, describes enzymes that catalyse only dimethylation of this substrate (the first two sub-reactions of this entry)

EC 2.1.1.354 created 1976 as EC 2.1.1.43, modified 1982, modified 1983, part transferred 2019 to EC 2.1.1.354, modified 2020