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- W2076572085 abstract "The fidelity of DNA synthesis by calf thymus DNA polymerase delta (pol delta) in vitro has been determined using an M13lacZ alpha nonsense codon reversion assay. Pol delta is highly accurate, producing on average less than 1 single-base substitution error for each 10(6) nucleotides polymerized. This accuracy is 10- and 500-fold greater than that of DNA polymerases alpha and beta, respectively, in the same assay. Three observations suggest that this higher fidelity results in part from proofreading of misinserted bases by the 3' to 5' exonuclease associated with pol delta. First, the exonuclease efficiently excises terminally mismatched bases. Second, both terminal mismatch excision and the fidelity of DNA synthesis by pol delta are reduced with increasing concentration of deoxynucleoside triphosphates in the synthesis reaction. These effects result from increasing the rate of polymerization relative to the rate of exonucleolytic excision and are hallmarks of exonuclease proofreading. Third, both terminal mismatch excision and fidelity decrease upon addition to the reaction mixture of adenosine monophosphate, a compound known to selectively inhibit the exonuclease but not the polymerase activity of pol delta. These results suggest that 3' to 5' exonuclease-dependent proofreading enhances the fidelity of DNA synthesis by a mammalian DNA polymerase in vitro." @default.
- W2076572085 created "2016-06-24" @default.
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- W2076572085 date "1987-07-01" @default.
- W2076572085 modified "2023-10-17" @default.
- W2076572085 title "Exonucleolytic proofreading by calf thymus DNA polymerase delta." @default.
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- W2076572085 doi "https://doi.org/10.1073/pnas.84.14.4865" @default.
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