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- W2006762876 abstract "A thermostable DNA polymerase which possesses an associated 3'-to-5' exonuclease (proofreading) activity has been isolated from the hyperthermophilic archaebacterium, Pyrococcus furiosus (Pfu). To test its fidelity, we have utilized a genetic assay that directly measures DNA polymerase fidelity in vitro during the polymerase chain reaction (PCR). Our results indicate that PCR performed with the DNA polymerase purified from P. furiosus yields amplification products containing less than 10% of the number of mutations obtained from similar amplifications performed with Taq DNA polymerase. The PCR fidelity assay is based on the amplification and cloning of lacI, lacO and lacZα gene sequences (lacIOZα) using either Pfu or Taq DNA polymerase. Certain mutations within the lacI gene inactivate the Lac repressor protein and permit the expression of βGal. When plated on a chromogenic substrate, these LacI− mutants exhibit a blue-plaque phenotype. These studies demonstrate that the error rate per nucleotide induced in the 182 known detectable sites of the lacI gene was 1.6 × 10−6 for Pfu DNA polymerase, a greater than tenfold improvement over the 2.0 × 10−5 error rate for Taq DNA polymerase, after approx. 105-fold amplification." @default.
- W2006762876 created "2016-06-24" @default.
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- W2006762876 date "1991-12-01" @default.
- W2006762876 modified "2023-09-27" @default.
- W2006762876 title "High-fidelity amplification using a thermostable DNA polymerase isolated from Pyrococcus furiosus" @default.
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- W2006762876 doi "https://doi.org/10.1016/0378-1119(91)90480-y" @default.
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