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- W1523726075 abstract "The system previously used to study recombination of nonreplicating UV-irradiated phage lambda DNA was adapted to study UV repair. Irradiated phages infected undamaged homoimmune lysogens. Pyrimidine dimer content (by treatment with Micrococcus luteus UV endonuclease and alkaline sucrose sedimentation) and a biological activity endpoint (infectivity in transfection of uvrB recA recB spheroplasts) were followed. Unless room light was excluded during DNA extraction procedures, photoreactivation (Phr function) was significant. In uvr delta phr bacteria, repair, by both assays, was very low but not zero. Even when light was totally excluded, Phr function appeared to play a role in Uvr-mediated excision repair: both dimer removal and restoration of infectivity were two to five times as efficient in uvr+ phr+ bacteria as in uvr+ delta phr bacteria. Similarly, UV-irradiated phages plated with higher efficiencies on phr+ than delta phr bacteria even under totally dark conditions. In uvr phr+ repressed infections, removal of dimers from nonreplicating DNA did not increase infectivity as much as in uvr+ infections, suggesting a requirement for repair of nondimer photoproducts by the uvrABC system." @default.
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- W1523726075 date "1985-02-01" @default.
- W1523726075 modified "2023-09-23" @default.
- W1523726075 title "Repair of nonreplicating UV-irradiated DNA: cooperative dark repair by Escherichia coli uvr and phr functions" @default.
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- W1523726075 doi "https://doi.org/10.1128/jb.161.2.602-608.1985" @default.
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