demethylspheroidene O-methyltransferase Quick inquiry In which to obtain Suppliers vary In Rhodopseudomonas capsulata and Rubrivivax gelatinosus the enzyme is linked to biosynthesis of spheroidene. In Rubrivivax gelatinosus the enzyme also catalyses the methylation of demethylspirilloxanthin to spirilloxanthin as well as methylation of 3,four-dideh