Abstract
Summary: The expression of Bacillus stearothermophilus genes complementing arginine auxotrophs of Escherichia coli was studied. The activity responsible for the formation of ornithine in B. stearothermophilus was identified as a repressible ornithine acetyltransferase (genetic symbol argJ) encoded by the same DNA fragment as the argC, orgA and argB genes. Bacillus subtilis and Bacillus licheniformis displayed the same pattern of enzyme activities as B. stearothermophilus. In contrast to previous reports, these organisms consequently use the cyclic pathway of ornithine biosynthesis. B. stearothermophilus also possesses a broad specificity aminoacylase which exhibits low affinity towards N 2-acetyl-l-ornithine.
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