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Journal of Bacteriology, January 2005, p. 376-381, Vol. 187, No. 1
0021-9193/05/$08.00+0     doi:10.1128/JB.187.1.376-381.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

The katA Catalase Gene Is Regulated by OxyR in both Free-Living and Symbiotic Sinorhizobium meliloti

Alexandre Jamet,1 Ernö Kiss,2 Jacques Batut,2 Alain Puppo,1 and Didier Hérouart1*

Laboratoire Interactions Plantes-Microorganismes et Santé Végétale, UMR Institut National de la Recherche Agronomique (1064), Université de Nice Sophia-Antipolis, Centre National de la Recherche Scientifique (6192), Sophia Antipolis,1 Laboratoire des Interactions Plantes Micro-organismes, UMR Centre National de la Recherche Scientifique (2594), Institut National de la Recherche Agronomique (441), Castanet Tolosan, France2

Received 18 June 2004/ Accepted 25 September 2004

The characterization of an oxyR insertion mutant provides evidences that katA, which encodes the unique H2O2-inducible HPII catalase, is regulated by OxyR not only in free-living Sinorhizobium meliloti but also in symbiotic S. meliloti. Moreover, oxyR is expressed independently of exogenous H2O2 and downregulates its own expression in S. meliloti.

* Corresponding author. Mailing address: Laboratoire Interactions Plantes-Microorganismes et Santé Végétele, UMR, INRA, Université de Nice Sophia-Antipolis, CNRS, 400 Route des Chappes, BP 167, F-06903 Sophia Antipolis Cedex, France. Phone: (33)4 92 38 66 36. Fax: (33)4 92 38 66 40. E-mail: herouart{at}unice.fr;

Journal of Bacteriology, January 2005, p. 376-381, Vol. 187, No. 1
0021-9193/05/$08.00+0     doi:10.1128/JB.187.1.376-381.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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