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The active site of porphobilinogen (PBG) deaminase has been enriched with carbon-13 using cells of genetically engineered E . coli. NMR spectroscopy has uncovered the structure of a novel dipyrromethane cofactor, covalently bound through Cys-242, which acts as a nucleophilic site for the covalent binding of substrate. Based on the results of pulse experiments with 13C-enriched S-adenosyl methionine (SAM), the sequence of methylation in the overall conversion of uro'gen 111 to cobyrinic acid isdoi:10.1351/pac198961030501 fatcat:g55e3q3c4zfdthnol2yfh2aznu