part of ubiquinone biosynthetic process O-methyltransferase activity S-adenosylmethionine-dependent methyltransferase activity 3-demethylubiquinone 3-O-methyltransferase activity https://github.com/geneontology/go-ontology/issues/29459 sjm Catalysis of the reaction: a 3-demethylubiquinone + S-adenosyl-L-methionine = a ubiquinone + S-adenosyl-L-homocysteine. 2024-12-18T09:25:15Z molecular_function GO:0120537 RHEA:81215