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Journal of Bacteriology, January 2000, p. 198-202, Vol. 182, No. 1
0021-9193/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Involvement of Carbon Source and Acetyl Phosphate in the External-pH-Dependent Expression of Porin Genes in Escherichia coli

Martine Heyde, Patrick Laloi,* and Raymond Portalier

Unité de Microbiologie et Génétique, UMR CNRS 5577, Université Lyon I, F-69622 Villeurbanne Cedex, France

Received 6 July 1999/Accepted 14 October 1999

The porin composition of the Escherichia coli cell envelope was analyzed during growth at different external pHs (pHo) as a function of the acetyl phosphate (AcP) level (Delta ackA pta or ackA mutant, pyruvate or glucose as the carbon source) in the presence or absence of EnvZ. Our results indicate that the AcP level is influenced by the pHo, leading to modulation of the amount of OmpR-P and subsequent pHo-dependent expression of ompF and ompC. We also propose the existence of a specific signal, independent of EnvZ and AcP, leading to OmpR phosphorylation in response to pyruvate.

* Corresponding author. Mailing address: Unité de Microbiologie et Génétique, UMR CNRS 5577, Bâtiment 405, Université Lyon I, F-69622 Villeurbanne Cedex, France. Phone: 33 472 431 621. Fax: 33 472 432 686. E-mail: plaloi{at}biomserv.univ-lyon1.fr.

Journal of Bacteriology, January 2000, p. 198-202, Vol. 182, No. 1
0021-9193/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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