We have examined the effect of thioredoxin, an accessory protein that confers high processivity to bacteriophage T7 DNA polymerase, on the fidelity of DNA synthesis. In the presence of thioredoxin, exonuclease-proficient T7 DNA polymerase is highly accurate. In fidelity assays that score errors that revert M13mp2 lacZ alpha-complementation mutants, error… (More)
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