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• W2043259679 abstract "When excision-deficient Escherichia coli carrying umuC or umuD alleles were exposed to visible light several hours after ultraviolet irradiation, base-pair-substitution mutations were induced in these normally non-UV-mutable bacteria. It is argued that delayed photoreversal of pyrimidine dimers removes blocks to DNA replication and allows the survival and expression of misincorporated bases. A model for UV mutagenesis is proposed with two steps: (i) misincorporation opposite a photoproduct, which can be mediated directly by RecA protein, and (ii) bypass, only the latter process requiring umuD+ and umuC+ alleles. Basal levels of gene products are sufficient for at least some misincorporation events, although induced levels of umuD and umuC gene products are necessary for the bypass step. umuC bacteria containing the recA441 allele showed a greater yield of mutants, and those containing recA430 a reduced yield, following delayed photoreversal. The lexA51 allele (which results in constitutive derepression of RecA protein production) did not significantly alter the yield of mutants but caused them to appear marginally sooner in a recA441 umuC strain. These results emphasize that the nature of the RecA protein and not its concentration is paramount in determining the level of misincorporation. Experiments with recA441 umuC bacteria at 43 degrees C and 30 degrees C suggest that the misincorporation effect is unlikely to be attributable to cleavage of a DNA binding protein such as a repressor or a component of the polymerase complex. Moreover, misincorporation seems to occur without the need for induced synthesis of any other protein under recA control." @default.
• W2043259679 created "2016-06-24" @default.
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• W2043259679 date "1985-06-01" @default.
• W2043259679 modified "2023-10-16" @default.
• W2043259679 title "Mutagenic repair in Escherichia coli: products of the recA gene and of the umuD and umuC genes act at different steps in UV-induced mutagenesis." @default.
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• W2043259679 doi "https://doi.org/10.1073/pnas.82.12.4193" @default.
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