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- W2078752925 abstract "The Bacillus subtilis PerR repressor regulates the adaptive response to peroxide stress. The PerR regulon includes the major vegetative catalase (katA), an iron storage protein (mrgA), an alkylhydroperoxide reductase (ahpCF), a zinc uptake system (zosA), heme biosynthesis enzymes (hemAXCDBL), the iron uptake repressor (fur), and perR itself. A perR null strain is resistant to hydrogen peroxide, accumulates a porphyrin-like compound, and grows very slowly. The poor growth of the perR mutant can be largely accounted for by the elevated expression of two proteins: the KatA catalase and Fur. Genetic studies support a model in which poor growth of the perR null mutant is due to elevated repression of iron uptake by Fur, exacerbated by heme sequestration by the abundant catalase protein. Analysis of the altered-function allele perR991 further supports a link between PerR and iron homeostasis. Strains containing perR991 are peroxide resistant but grow nearly as well as the wild type. Unlike a perR null allele, the perR991 allele (F51S) derepresses KatA, but not Fur, which likely accounts for its comparatively rapid growth." @default.
- W2078752925 created "2016-06-24" @default.
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- W2078752925 date "2012-03-01" @default.
- W2078752925 modified "2023-10-16" @default.
- W2078752925 title "Derepression of the Bacillus subtilis PerR peroxide stress response leads to iron deficiency." @default.
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- W2078752925 doi "https://doi.org/10.1128/jb.06566-11" @default.
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