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- W1569239054 abstract "Abstract The all-type nicking enzyme (ATE) from human HeLa cells or calf thymus can nick DNA at the first phosphodiester bond 5' to all 8 possible mismatched bases. The strand disparity of this nicking is influenced by the neighboring nucleotide sequences. After nicking, the ATE covalently binds to the 3' end of the DNA product to form a cleavable complex, whose formation is insensitive to camptothecin, a specific inhibitor of eukaryotic topoisomerase I (Topo-I). During the purification of ATE from calf thymus, a Mg(2+)-independent relaxation activity, characteristic of eukaryotic Topo-I, copurifies with the mismatch-nicking activity. The ATE from calf thymus may be a breakdown product of Topo-I. N-terminal amino acid analysis indicates that one of the polypeptides with ATE activity contains the C-terminal portion of Topo-I. Moreover, active human Topo-I, expressed as a fusion protein in Escherichia coli, is also capable of nicking all 8 base mispairs in the absence of Mg2+. This mismatch-specific nicking activity may be a novel property of the mammalian Topo-I." @default.
- W1569239054 created "2016-06-24" @default.
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- W1569239054 date "1994-06-01" @default.
- W1569239054 modified "2023-10-03" @default.
- W1569239054 title "Mammalian topoisomerase I has base mismatch nicking activity." @default.
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- W1569239054 doi "https://doi.org/10.1016/s0021-9258(17)40707-1" @default.
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