1887

Abstract

synthesized an inducible extracellular collagenase in a peptone medium during the stationary growth phase. These cultures also possessed extracellular alkaline serine protease activity. The alkaline protease activity did not require a specific inducer and it was produced in tryptone or minimal media. The collagenase was not produced in either the tryptone or minimal media. The alkaline protease activity was sensitive to catabolite repression by a number of carbon sources, including glucose, and by amino acids and ammonium ions. Cyclic AMP, dibutyryl cyclic AMP and cyclic GMP did not relieve catabolite repression. Histidine and urocanic acid stimulated the production of alkaline protease activity in tryptone and minimal media. Other compounds associated with the histidine utilization () pathway did not increase alkaline protease activity. Histidine reversed the repression of alkaline protease activity by glucose or (NH)SO in minimal medium. Histidine and the compounds associated with the pathway inhibited collagenase production.

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/content/journal/micro/10.1099/00221287-127-1-193
1981-11-01
2024-12-14
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