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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

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.

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