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Conversion of 5-guanidino-2-oxo-pentanoic acid into 5-guanidino-3-methyl-2-oxo-pentanoic acid by the SAM-dependent methyltransferase MrsA. Reaction scheme (A), LC-MS ion traces at m/z 174 and m/z 188 (B), and ESI-MS-MS (C) for 5-guanidino-2-oxo-pentanoic acid and 5-guanidino-3-methyl-2-oxo-pentanoic acid. I/%, relative intensity (percent).
