title: Sinorhizobium meliloti rpoE2 is necessary for H(2)O(2) stress resistance during the stationary growth phase.
abstract: 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.
authors.affiliation: CNRS UMR6026 DUALS, Universite Rennes I, Rennes, France.
authors.forename: Maud
authors.initials: M
authors.lastname: Flechard
authors.forename: Catherine
authors.initials: C
authors.lastname: Fontenelle
authors.forename: Annie
authors.initials: A
authors.lastname: Trautwetter
authors.forename: Gwennola
authors.initials: G
authors.lastname: Ermel
authors.forename: Carlos
authors.initials: C
authors.lastname: Blanco
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D002374:Catalase / Q000235:genetics / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D018869:Heat-Shock Response; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D009154:Mutation; D012808:Sigma Factor / Q000235:genetics / Q000378:metabolism*; D016962:Sinorhizobium meliloti / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D013482:Superoxide Dismutase / Q000235:genetics / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D012808:Sigma Factor; C063202:sporulation-specific sigma factors; D006861:Hydrogen Peroxide; C102664:hydroperoxidase II; D002374:Catalase; D013482:Superoxide Dismutase