Reaction: S-adenosyl-L-methionine + demethylmacrocin = S-adenosyl-L-homocysteine + macrocin
For diagram of reaction click here.
Other name(s): demethylmacrocin methyltransferase; DMOMT
Systematic name: S-adenosyl-L-methionine:demethylmacrocin 2"'-O-methyltransferase
Comments: Requires Mg2+. The enzyme, isolated from the bacterium Streptomyces fradiae, is involved in the biosynthesis of the macrolide antibiotic tylosin. The 2-hydroxy group of a 6-deoxy-D-allose moiety in demethylmacrocin acts as the methyl acceptor. Also acts on demethyllactenocin, giving lactenocin. Not identical with EC 18.104.22.168 macrocin O-methyltransferase.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 120313-64-6
1. Kreuzman, A.J., Turner, J.R. and Yeh, W.-K. Two distinctive O-methyltransferases catalyzing penultimate and terminal reactions of macrolide antibiotic (tylosin) biosynthesis. Substrate specificity, enzyme inhibition, and kinetic mechanism. J. Biol. Chem. 263 (1988) 15626-15633. [PMID: 3170602]