Effect of endogenous carotenoids and defective RpoS sigma factor on spontaneous mutation under starvation conditions in Escherichia coli: evidence for the possible involvement of singlet oxygen.

Abstract excerpt

Under starvation conditions, a variety of stationary phase genes are up-regulated under the control of the stationary phase sigma factor RpoS including at least two peroxidases and a protective DNA binding protein Dps. Previous work suggested that the reversion to prototrophy of certain amino acid auxotrophs of Escherichia coli that occurs when the bacteria are starved of a required amino acid results from the...

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