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J Bacteriol, February 1998, p. 985-988, Vol. 180, No. 4
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Both Acetate Kinase and Acetyl Coenzyme A Synthetase Are Involved in Acetate-Stimulated Change in the Direction of Flagellar Rotation in Escherichia coli

Rina Barak,1 Walid N. Abouhamad,2,dagger and Michael Eisenbach1,*

Department of Biological Chemistry, The Weizmann Institute of Science, 76100 Rehovot, Israel,1 and Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina 27599-72902

Received 12 August 1997/Accepted 5 December 1997

Escherichia coli strains overproducing the response regulator CheY respond to acetate by increasing their clockwise bias of flagellar rotation, even when they lack other chemotaxis proteins. With acetate metabolism mutants, we demonstrate that both acetate kinase and acetyl coenzyme A synthetase are involved in this response. Thus, a response was observed when one of these enzymes was missing but not when both were absent.

* Corresponding author. Mailing address: Department of Biological Chemistry, The Weizmann Institute of Science, 76100 Rehovot, Israel. Phone: (972)-8-934-3923. Fax: (972)-8-934-4112. E-mail: BMEISEN{at}WEIZMANN.WEIZMANN.AC.IL.

dagger Present address: Laboratory of Pharmacology & Chemistry, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709.




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