Demethylmenaquinone methyltransferase (, S-adenosyl-L-methionine-DMK methyltransferase, demethylmenaquinone C-methylase, 2-heptaprenyl-1,4-naphthoquinone methyltransferase, 2-demethylmenaquinone methyltransferase, S-adenosyl-L-methionine:2-demethylmenaquinone methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:demethylmenaquinone methyltransferase. This enzyme catalyses the following chemical reaction
demethylmenaquinol + S-adenosyl-L-methionine menaquinol + S-adenosyl-L-homocysteine
The enzyme catalyses the penultimate step in menaquinone biosynthesis.
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