Grossman AD, Ullmann A, Burgess RR, Gross CA. Regulation of cyclic AMP synthesis in Escherichia coli K-12: effects of the rpoD800 sigma mutation, glucose, and chloramphenicol.
J Bacteriol 1984;
158:110-4. [PMID:
6325382 PMCID:
PMC215386 DOI:
10.1128/jb.158.1.110-114.1984]
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Abstract
An immediate 12-fold inhibition in the rate of beta-galactosidase synthesis occurs in Escherichia coli cells containing the mutant sigma allele rpoD800 after a shift to 42 degrees C. In the present study we characterize the nature of the inhibition. The severe inhibition of beta-galactosidase synthesis was partly relieved by cyclic AMP (cAMP). We inferred that the inhibition might be mediated by a decreased intracellular concentration of cAMP. Consistent with this inference, the rate of cAMP accumulation in mutant cells after a temperature upshift was depressed relative to that in wild-type cells. Glucose and chloramphenicol, two agents known to inhibit differentially beta-galactosidase mRNA synthesis, caused a similar inhibition in the rate of cAMP accumulation. Thus, three diverse stimuli, glucose, chloramphenicol, and a temperature-sensitive sigma mutation, appear to affect beta-galactosidase synthesis by regulating the synthesis of cAMP.
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