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- W2069798717 abstract "Alpha-anomeric 2'-deoxynucleosides (alphadN) are one of the products formed by ionizing radiation (IR) in DNA under anoxic conditions. Alpha-2'-deoxyadenosine (alphadA) and alpha-thymidine (alphaT) are not recognized by DNA glycosylases, and are likely removed by the alternative nucleotide incision repair (NIR) pathway. Indeed, it has been shown that alphadA is a substrate for the Escherichia coli Nfo and human Ape1 proteins. However, the repair pathway for removal of alphadA and other alphadN in yeast is unknown. Here we report that alphadA when present in DNA is recognized by the Saccharomyces cerevisiae Apn1 protein, a homologue of Nfo. Furthermore, alphaT is a substrate for Nfo and Apn1. Kinetic constants indicate that alphadA and alphaT are equally good substrates, as a tetrahydrofuranyl (THF) residue, for Nfo and Apn1. Using E. coli and S. cerevisiae cell-free extracts, we have further substantiated the role of the nfo and apn1 gene products in the repair of alphadN. Surprisingly, we found that bacteria and yeast NIR-deficient mutants are not sensitive to IR, suggesting that DNA strand breaks with terminal 3'-blocking groups rather than alphadN might contribute to cell survival. We propose that the novel substrate specificities of Nfo and Apn1 play an important role in counteracting oxidative DNA base damage." @default.
- W2069798717 created "2016-06-24" @default.
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- W2069798717 date "2004-11-10" @default.
- W2069798717 modified "2023-09-30" @default.
- W2069798717 title "α-Anomeric Deoxynucleotides, Anoxic Products of Ionizing Radiation, Are Substrates for the Endonuclease IV-Type AP Endonucleases" @default.
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- W2069798717 doi "https://doi.org/10.1021/bi049214+" @default.
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