1887

Abstract

The production of alkaline protease, collagenase and histidine utilization (Hut) enzymes by Vibrio alginolyticus wild-type, and strains was investigated. Alkaline protease synthesis was stimulated by histidine and urocanic acid in the wild-type and strains. In the hutHl mutant alkaline protease production was stimulated by urocanic acid and not by histidine. The Hut enzymes in the wild-type strain were coordinately induced by histidine. Urocanase and forimino-hydrolase were induced by histidine in the mutant which lacked histidase and was not able to convert histidine to urocanic acid. Collagenase production in peptone medium was inhibited in the mutants. It is concluded that in urocanic acid regulates alkaline protease synthesis but that the Hut enzymes are induced by histidine. The involvement of the Hut genetic system in the regulation of alkaline protease and collagenase synthesis is discussed.

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/content/journal/micro/10.1099/00221287-128-9-2041
1982-09-01
2021-05-15
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