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Journal of Bacteriology, January 2000, p. 551-554, Vol. 182, No. 2
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

sigma 70 Is the Principal Sigma Factor Responsible for Transcription of acs, Which Encodes Acetyl Coenzyme A Synthetase in Escherichia coli

Suman Kumari, Erica J. Simel, and Alan J. Wolfe*

Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois 60153

Received 30 July 1999/Accepted 18 October 1999

Cells of Escherichia coli undergo a metabolic switch associated with the production and utilization of acetate. During exponential growth on tryptone broth, these cells excrete acetate via the phosphotransacetylase-acetate kinase (Pta-AckA) pathway. As they begin the transition to stationary phase, they instead resorb acetate, activate it to acetyl coenzyme A (acetyl-CoA) by means of the enzyme acetyl-CoA synthetase (Acs) and utilize it to generate energy and biosynthetic components via the tricarboxylic acid cycle and the glyoxylate shunt, respectively. This metabolic switch depends upon the induction of Acs. As part of our effort to dissect the mechanism(s) underlying induction and to identify the signal(s) that triggers that induction, we sought the sigma factor most responsible for acs expression. Using isogenic strains that carry a temperature sensitivity allele of the gene that encodes sigma 70 and either a wild-type or null allele of the gene that encodes sigma S, we determined by immunoblotting, reverse transcriptase PCR, and acs::lacZ transcriptional fusion analyses that sigma 70 is the sigma factor primarily responsible for the acs transcription that cells induce during mid-exponential phase. In contrast, sigma S partially inhibits that transcription as cells enter stationary phase.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, 2160 S. First Ave., Maguire Building 105, Rm. 3822, Maywood, IL 60153. Phone: (708) 216-5814. Fax: (708) 216-9574. E-mail: awolfe{at}luc.edu.

Journal of Bacteriology, January 2000, p. 551-554, Vol. 182, No. 2
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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