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Volume 148, Issue 1

Regulation of carbon utilization by sulfur availability in and Free

Abstract

Different pleiotropic transcriptional regulators are known to function in the coordination of regulons concerned with carbon, nitrogen, sulfur, phosphorus and iron metabolism, but how expression profiles of these different regulons are coordinated with each other is not known. The basis for the effects of mutations on carbon utilization in and was examined. mutations affected the utilization of some carbon sources more than others and these effects could be partially, but not completely, reversed by the inclusion of cysteine or djenkolate in the growth medium. Assays of transport systems and enzymes concerned with glucitol and alanine utilization showed that these activities were depressed in mutants relative to isogenic wild-type strains, and cysteine or djenkolate present in the growth media partially restored these activities. Using transcriptional fusions to the (formate dehydrogenase) and (glucitol) operons, it was shown that decreased expression resulted from defects at the transcriptional level. Furthermore, the effects of loss of CysB were much less pronounced under conditions of catabolite repression than in the absence of a catabolite-repressing carbon source, and cAMP largely reversed the effect of the loss of CysB. Comparable effects were seen for gene expression under the control of its own native promoter, and sulfur limitation in a mutant depressed net cAMP production in a cAMP phosphodiesterase mutant. Adenylate cyclase thus appears to be responsive to sulfur deprivation. These observations may have physiological significance allowing carbon and sulfur regulon coordination during the growth of enteric bacteria in response to nutrient availability.

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  • Accepted:
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Keyword(s): adenylate cyclase , CRP, cAMP-receptor protein , CysB , EMB, eosin-methylene blue , pleiotropic regulators , regulon and transcription
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2002-01-01
2024-04-19
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Regulation of carbon utilization by sulfur availability in Escherichia coli and Salmonella typhimurium
Microbiology 148, 123 (2002); https://doi.org/10.1099/00221287-148-1-123
/content/journal/micro/10.1099/00221287-148-1-123
/content/journal/micro/10.1099/00221287-148-1-123
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