methyltransferase activity demethylmenaquinone methyltransferase activity https://github.com/geneontology/go-ontology/issues/28070 https://github.com/geneontology/go-ontology/issues/28526 RHEA:44792 GO:0043770 RHEA:44796 molecular_function RHEA:44776 MetaCyc:RXN-11046 RHEA:42640 RHEA:44780 RHEA:44784 EC:2.1.1.163 MetaCyc:ADOMET-DMK-METHYLTRANSFER-RXN RHEA:44788 Catalysis of the reaction: a 2-demethylmenaquinol + S-adenosyl-L-methionine = a menaquinol + H+ + S-adenosyl-L-homocysteine. Reaction substrates can have varying polyprenyl side chain length. RHEA:30063 MetaCyc:RXN-9191 RHEA:33255 RHEA:26466