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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Temperature-sensitive DNA polymerase induced by a bacteriophage T5 mutant: relationship between polymerase and exonuclease activities.

DNA polymerase induced by bacteriophage T5ts53, a mutant with temperature-sensitive polymerase, was purified to about 95% purity as judged by dodecyl sulfate gel electrophoresis. The 3' leads to 5' exonuclease associated with the polymerase had higher activity than that associated with the parent wild-type enzyme. It was more stable to heat than the polymerase, and it degraded primer-template even in the presence of 4 dNTP's at higher temperature. However, the evidence presented shows that the inhibition of DNA synthesis by higher temperature was primarily due to defects in polymerase function rather than to overactive exonuclease. The presence of primer-template DNA stabilized the polymerase to heat. Purified ts53 polymerase was also shown to discriminate against incorportion of BrdUMP, especially at higher temperature. This is an agreement with observations made in vivo with ts53-infected bacteria.[1]


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