Sinorhizobium meliloti rpoE2 is necessary for H(2)O(2) stress resistance during the stationary growth phase

RpoE2 is an extracytoplasmic sigma factor produced by Sinorhizobium meliloti during stationary growth phase. Its inactivation affected the synthesis of the superoxide dismutase, SodC, and catalase, KatC. The absence of SodC within the cell did not result in an increased sensitivity to extracellular...

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Bibliographic Details
Published in:FEMS microbiology letters 2009-01, Vol.290 (1), p.25-31
Main Authors: Flechard, Maud, Fontenelle, Catherine, Trautwetter, Annie, Ermel, Gwennola, Blanco, Carlos
Format: Article
Language:English
Subjects:
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
Catalase - genetics
Catalase - metabolism
Gene Expression Regulation, Bacterial
Heat-Shock Response
Hydrogen Peroxide - pharmacology
Mutation
Sigma Factor - genetics
Sigma Factor - metabolism
Sinorhizobium meliloti - genetics
Sinorhizobium meliloti - growth & development
Sinorhizobium meliloti - metabolism
Sinorhizobium meliloti - physiology
Superoxide Dismutase - genetics
Superoxide Dismutase - metabolism
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Summary:RpoE2 is an extracytoplasmic sigma factor produced by Sinorhizobium meliloti during stationary growth phase. Its inactivation affected the synthesis of the superoxide dismutase, SodC, and catalase, KatC. The absence of SodC within the cell did not result in an increased sensitivity to extracellular superoxides. In contrast, the absence of KatC affected the resistance of S. meliloti to H(2)O(2) during the stationary growth phase. A katC strain behaved as an rpoE2 strain during an H(2)O(2) challenge, suggesting that the H(2)O(2) sensitivity of the rpoE2 strain resulted only from the lack of KatC in this strain.
ISSN:0378-1097
DOI:10.1111/j.1574-6968.2008.01401.x