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Journal of Bacteriology, May 1999, p. 2759-2764, Vol. 181, No. 9
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

In Vivo Transcription of the Escherichia coli oxyR Regulon as a Function of Growth Phase and in Response to Oxidative Stress

Carmen Michán, Manuel Manchado, Gabriel Dorado, and Carmen Pueyo*

Departamento de Bioquímica y Biología Molecular, Universidad de Córdoba, 14071 Córdoba, Spain

Received 8 September 1998/Accepted 20 February 1999

Simultaneous expression of seven genes in Escherichia coli was measured by a reverse transcription-multiplex PCR fluorescence procedure. Genes studied were (i) oxyR (transcriptional regulator); (ii) katG, dps, gorA, and ahpCF (controlled by OxyR); (iii) sodA (controlled by SoxRS); and (iv) trxA (not related to OxyR or SoxRS). Except for trxA, transcription of all genes was activated during the course of growth of wild-type bacteria, though notable variations were observed with respect to both the time and extent of activation. Whereas oxyR, katG, dps, and gorA were activated during exponential growth, ahpCF and sodA were stimulated in stationary phase. Maximal induction ranged from 4.6- to 86.5-fold, for gorA and dps, respectively. Treatment with H2O2 stimulated expression of the genes (katG, dps, ahpCF, and gorA) previously identified as members of the OxyR regulon, except for oxyR itself. Induction by H2O2 was a remarkably rapid and reversible process that took place in an OxyR-dependent and sigma S-independent manner. NaCl induced expression of the genes controlled by OxyR, including the oxyR locus. This transcriptional up-regulation was preserved in a strain with the Delta oxyR::kan mutation, but it was abolished (ahpCF) or significantly reduced (oxyR and dps) in a strain with the rpoS::Tn10 mutation, potentially reflecting positive transcriptional regulation of the oxyR regulon by sigma S. Expression of trxA was not increased either by H2O2 stress or by a shift to high-osmolarity conditions.

* Corresponding author. Mailing address: Departamento de Bioquímica y Biología Molecular, Avda. de Medina Azahara s/n, Universidad de Córdoba, 14071 Córdoba, Spain. Phone: 34-957-218695. Fax: 34-957-218688. E-mail: bb1pucuc{at}uco.es.

Journal of Bacteriology, May 1999, p. 2759-2764, Vol. 181, No. 9
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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