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Journal of Bacteriology, June 2001, p. 3800-3803, Vol. 183, No. 12
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.12.3800-3803.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Cs+ Induces the kdp Operon of Escherichia coli by Lowering the Intracellular K+ Concentration

Kirsten Jung,* Mechthild Krabusch, and Karlheinz Altendorf

Abteilung Mikrobiologie, Fachbereich Biologie/Chemie, Universität Osnabrück, D-49069 Osnabrück, Germany

Received 22 January 2001/Accepted 27 March 2001

Cs+ was found to induce expression of the kdpFABC operon, encoding a high-affinity K+ uptake system of Escherichia coli. Quantitative expression analyses at the transcriptional and translational levels reveal that CsCl causes much higher induction of kdpFABC than does NaCl. A decrease of the intracellular K+ concentration is found in cells exposed to CsCl. The results indicate that kdpFABC expression is induced when the intracellular K+ concentration is lowered. Moreover, the results imply that the signal transduction cascade mediated by KdpD and KdpE is able to integrate multiple signals.

* Corresponding author. Mailing address: Universität Osnabrück, Fachbereich Biologie/Chemie, Abteilung Mikrobiologie, D-49069 Osnabrück, Germany. Phone: 49-541-969-2276. Fax: 49-541-969-2870. E-mail: jung_k{at}biologie.uni-osnabrueck.de.

Journal of Bacteriology, June 2001, p. 3800-3803, Vol. 183, No. 12
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.12.3800-3803.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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