The Enzyme Database

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Accepted name: 5-guanidino-2-oxopentanoate (3R)-methyltransferase
Reaction: S-adenosyl-L-methionine + 5-guanidino-2-oxopentanoate = S-adenosyl-L-homocysteine + (3R)-5-guanidino-3-methyl-2-oxopentanoate
Glossary: 5-guanidino-2-oxopentanoate = 2-ketoarginine
(3R)-5-guanidino-3-methyl-2-oxopentanoate = (3R)-5-carbamimidamido-3-methyl-2-oxopentanoate
Other name(s): mrsA (gene name); argN (gene name); 2-ketoarginine methyltransferase; S-adenosyl-L-methionine:5-carbamimidamido-2-oxopentanoate S-methyltransferase
Systematic name: S-adenosyl-L-methionine:5-guanidino-2-oxopentanoate (3R)-methyltransferase
Comments: The enzyme is involved in production of the rare amino acid (3R)-3-methyl-L-arginine. The compound is used by the epiphytic bacterium Pseudomonas syringae pv. syringae as an antibiotic against the related pathogenic species Pseudomonas savastanoi pv. glycinea. Other bacteria incorporate the compound into more complex compounds such as the peptidyl nucleoside antibiotic arginomycin.
Links to other databases: BRENDA, EXPASY, Gene, KEGG, MetaCyc
1.  Braun, S.D., Hofmann, J., Wensing, A., Ullrich, M.S., Weingart, H., Völksch, B. and Spiteller, D. Identification of the biosynthetic gene cluster for 3-methylarginine, a toxin produced by Pseudomonas syringae pv. syringae 22d/93. Appl. Environ. Microbiol. 76 (2010) 2500–2508. [DOI] [PMID: 20190091]
2.  Feng, J., Wu, J., Gao, J., Xia, Z., Deng, Z. and He, X. Biosynthesis of the β-methylarginine residue of peptidyl nucleoside arginomycin in Streptomyces arginensis NRRL 15941. Appl. Environ. Microbiol. 80 (2014) 5021–5027. [DOI] [PMID: 24907335]
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