Abstract
Assay of the first enzyme unique to methionine biosynthesis, homoserine-O-transsuccinylase, in metJ and metK regulatory mutants of Salmonella typhimurium showed that synthesis of the enzyme was derepressed seven- and fourfold, respectively. The possibility of noncoordinate regulation of the methionine enzymes is discussed. In metA feedback-resistant mutants, the enzyme activity can be inhibited in vitro by 10 mmS-adenosylmethionine but not by 10 mm l-methionine; hence, the synergistic inhibition found for the wild-type enzyme is not effective in these latter mutants.
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Selected References
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