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- W2016346419 abstract "The main virulence factors of Erwinia carotovora subsp. carotovora, the secreted, extracellular cell-wall-degrading enzymes, are controlled by several regulatory mechanisms. We have isolated transposon mutants with reduced virulence on tobacco. One of these mutants, with a mutation in a gene designated expM, was characterized in this study. This mutant produces slightly reduced amounts of extracellular enzymes in vitro and the secretion of the enzymes is also affected. The expM wild-type allele was cloned together with an upstream gene, designated expL, that has an unknown function. The expM gene was sequenced and found to encode a protein with similarity to the RssB/SprE protein of Escherichia coli and the MviA protein of Salmonella typhimurium. These proteins belong to a new type of two-component response regulators that negatively regulate the stability of the Sigma factor RpoS (σ S ) at the protein level. The results of this study suggest that ExpM has a similar function in E. carotovora subsp. carotovora. We also provide evidence that the overproduction of RpoS in the expM mutant is an important factor for the reduced virulence phenotype and that it partly causes the observed phenotype seen in vitro. However, an expM/rpoS double mutant is still affected in secretion of extracellular enzymes, suggesting that ExpM in addition to RpoS also acts on other targets." @default.
- W2016346419 created "2016-06-24" @default.
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- W2016346419 date "1999-07-01" @default.
- W2016346419 modified "2023-09-30" @default.
- W2016346419 title "The Response Regulator ExpM Is Essential for the Virulence of <i>Erwinia carotovora</i> subsp. <i>carotovora</i> and Acts Negatively on the Sigma Factor RpoS (σ<sup>S</sup>)" @default.
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- W2016346419 doi "https://doi.org/10.1094/mpmi.1999.12.7.575" @default.
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