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- W3149920249 abstract "Oxidized dGTP (8-oxo-7,8-dihydro-2´-deoxyguanosine triphosphate, 8-oxodGTP) insertion by DNA polymerases strongly promotes cancer and human disease. How DNA polymerases discriminate against oxidized and undamaged nucleotides, especially in error-prone double strand break (DSB) repair, is poorly understood. High-resolution time-lapse X-ray crystallography snapshots of DSB repair polymerase μ undergoing DNA synthesis reveal that a third active site metal promotes insertion of oxidized and undamaged dGTP in the canonical anti-conformation opposite template cytosine. The product metal bridged O8 with product oxygens, and was not observed in the syn-conformation opposite template adenine (At). Rotation of At into the syn-conformation enabled undamaged dGTP misinsertion. Exploiting metal and substrate dynamics in a rigid active site allows 8-oxodGTP to circumvent polymerase fidelity safeguards to promote pro-mutagenic double strand break repair." @default.
- W3149920249 created "2021-04-13" @default.
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- W3149920249 date "2021-04-06" @default.
- W3149920249 modified "2023-10-15" @default.
- W3149920249 title "Watching a double strand break repair polymerase insert a pro-mutagenic oxidized nucleotide" @default.
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- W3149920249 doi "https://doi.org/10.1038/s41467-021-21354-6" @default.
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