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• W1859475975 startingPage "1843" @default.
• W1859475975 abstract "Derivatives of the widely used laboratory strain Staphylococcus aureus NCTC8325, which are natural rsbU mutants, were shown to be unable to produce RsbU, a positive regulator of the alternative sigma factor sigma(B). The lack of RsbU prevented the heat-dependent production of sigma(B)-controlled transcripts and resulted in reduced H2O2 and UV tolerance, enhanced alpha-hemolysin activity, and the inability to produce the alkaline shock protein Asp23. After 48 h of growth, rsbU mutant strains failed to accumulate staphyloxanthin, the major stationary-phase carotenoid. Transcription of Asp23 was found to be exclusively controlled by sigma(B), making it an excellent target for the study of sigma(B) activity in S. aureus. Reporter gene experiments, using the firefly luciferase gene (luc+) fused to the sigma(B)-dependent promoter(s) of asp23, revealed that sigma(B) is almost inactive in 8325 derivatives. cis complementation of the 8325 derivative BB255 with the wild-type rsbU gene from strain COL produced the rsbU(+) derivative GP268, a strain possessing a sigma(B) activity profile comparable to that of the rsbU(+) wild-type strain Newman. In GP268, the heat inducibility of sigma(B)-dependent genes, Asp23 production, alpha-hemolysin activity, pigmentation, and susceptibility to H2O2 were restored to the levels observed in strain Newman, clearly demonstrating that RsbU is needed for activation of sigma(B) in S. aureus." @default.
• W1859475975 created "2016-06-24" @default.
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• W1859475975 date "2001-03-15" @default.
• W1859475975 modified "2023-10-06" @default.
• W1859475975 title "ς ^B Activity Depends on RsbU in <i>Staphylococcus aureus</i>" @default.
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• W1859475975 doi "https://doi.org/10.1128/jb.183.6.1843-1852.2001" @default.
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