Summary: We have shown that the low histidase activity found in anaerobic, nitrogen-limited cultures of is due to repression of the right-hand operon. In addition, we have examined the effects of NO on the aerobic and anaerobic expression of catabolite and NH -repressible enzymes in this organism. NO permitted anaerobic growth of in minimal medium containing histidine as the sole carbon source, and histidase and succinate dehydrogenase were derepressed during anaerobic growth in histidine/NO medium. Use of sucrose rather than histidine as the carbon source reversed the effects of NO and repressed histidase and succinate dehydrogenase activities. Anaerobic growth in sucrose/NO medium also uncoupled the expression of urease and glutamine synthetase.


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