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Journal of Bacteriology, November 2001, p. 6466-6477, Vol. 183, No. 21
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.21.6466-6477.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Acetate and Formate Stress: Opposite Responses in the Proteome of Escherichia coli

Christopher Kirkpatrick,1 Lisa M. Maurer,1 Nikki E. Oyelakin,1 Yuliya N. Yoncheva,1 Russell Maurer,2,dagger and Joan L. Slonczewski1,*

Department of Biology, Kenyon College, Gambier, Ohio 43022,1 and Department of Molecular Biology and Microbiology, Case Western Reserve University School of Medicine, Cleveland, Ohio 441062

Received 7 May 2001/Accepted 29 July 2001

Acetate and formate are major fermentation products of Escherichia coli. Below pH 7, the balance shifts to lactate; an oversupply of acetate or formate retards growth. E. coli W3110 was grown with aeration in potassium-modified Luria broth buffered at pH 6.7 in the presence or absence of added acetate or formate, and the protein profiles were compared by two-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Acetate increased the steady-state expression levels of 37 proteins, including periplasmic transporters for amino acids and peptides (ArtI, FliY, OppA, and ProX), metabolic enzymes (YfiD and GatY), the RpoS growth phase regulon, and the autoinducer synthesis protein LuxS. Acetate repressed 17 proteins, among them phosphotransferase (Pta). An ackA-pta deletion, which nearly eliminates interconversion between acetate and acetyl-coenzyme A (acetyl-CoA), led to elevated basal levels of 16 of the acetate-inducible proteins, including the RpoS regulon. Consistent with RpoS activation, the ackA-pta strain also showed constitutive extreme-acid resistance. Formate, however, repressed 10 of the acetate-inducible proteins, including the RpoS regulon. Ten of the proteins with elevated basal levels in the ackA-pta strain were repressed by growth of the mutant with formate; thus, the formate response took precedence over the loss of the ackA-pta pathway. The similar effects of exogenous acetate and the ackA-pta deletion, and the opposite effect of formate, could have several causes; one possibility is that the excess buildup of acetyl-CoA upregulates stress proteins but excess formate depletes acetyl-CoA and downregulates these proteins.

* Corresponding author. Mailing address: Department of Biology, Kenyon College, Gambier, OH 43022. Phone: (740) 427-5397. Fax: (740) 427-5741. E-mail: slonczewski{at}kenyon.edu.

dagger Present address: Hawken School, Gates Mills, OH 44040.

Journal of Bacteriology, November 2001, p. 6466-6477, Vol. 183, No. 21
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.21.6466-6477.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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