Reference: Bauer GA and Burgers PM (1988) Protein-protein interactions of yeast DNA polymerase III with mammalian and yeast proliferating cell nuclear antigen (PCNA)/cyclin. Biochim Biophys Acta 951(2-3)

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Abstract


We have previously reported the purification of yeast analogs to mammalian DNA polymerase delta and proliferating-cell nuclear antigen (PCNA)/cyclin: DNA polymerase III and yeast PCNA, respectively. Through the use of gel-filtration chromatography, we have studied the interaction of the model template-primer system poly(dA).(dT)16 (40:1) with yeast DNA polymerase III and with PCNAs. Yeast DNA polymerase III binds to the DNA in the absence of yeast PCNA/cyclin, but comigration of either yeast or calf thymus PCNA/cyclin with the DNA requires the additional presence of yeast DNA polymerase III. We could also isolate a DNA-calf thymus DNA polymerase delta-calf thymus PCNA/cyclin complex. From these data, we propose that PCNA/cyclin is involved not in the binding step of the polymerase to the template-primer, but in the elongation step. The 3'----5' exonuclease associated with yeast DNA polymerase III acts in a distributive manner on poly(dA).(pT)16, and dissociates from the DNA when addition of dTTP allows switching from the exonuclease to the polymerase mode. Addition of PCNA/cyclin had no effect on these activities.

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Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
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Bauer GA, Burgers PM
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