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• W2078883324 startingPage "3325" @default.
• W2078883324 abstract "Induction of the Escherichia coli SOS system increases the ability of the cells to perform DNA repair and mutagenesis. Previous work has shown that this increased mutagenesis is the result of derepression of specific genes through a complex regulatory mechanism controlled by LexA and RecA proteins. One role of RecA protein in this process is to facilitate proteolytic cleavage of LexA protein (the repressor) in response to an inducing signal that reversibly activates RecA protein to perform this function. We show that activated RecA protein plays a second role in SOS mutagenesis, as revealed by analyzing repair of UV-damaged phage lambda in host mutants with alterations in the SOS regulatory system. First, phage mutagenesis was not expressed constitutively in a mutant that is derepressed through lack of functional LexA protein; activated RecA protein was still required. Second, phage mutagenesis was constitutively expressed in the presence of recA mutations that alter RecA protein so that it is activated in normally growing cells. There was also RecA-dependent constitutive expression of SOS mutagenesis in host mutants that lack functional LexA protein and carry plasmids. We discuss several possible biochemical mechanisms for this second role of activated RecA protein in SOS mutagenesis." @default.
• W2078883324 created "2016-06-24" @default.
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• W2078883324 date "1985-05-01" @default.
• W2078883324 modified "2023-10-18" @default.
• W2078883324 title "Dual role for Escherichia coli RecA protein in SOS mutagenesis." @default.
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• W2078883324 doi "https://doi.org/10.1073/pnas.82.10.3325" @default.
• W2078883324 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/397768" @default.
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