Characterization of a DNA polymerase associated with an endogenous DNA-synthesizing complex isolated from human lymphoid cells.


We have shown that a membrane fraction prepared from isolated human ...
We have shown that a membrane fraction prepared from isolated human lymphoid nuclei contains endogenous DNA-synthesizing activity which is sensitive to RNAase. We have isolated a DNA polymerase from this fraction and partially purified it to what we estimate as about 10 000-fold. Its chromatographic behavior, template specificity, sedimentation constant, pH optimum, and sensitivity to N-ethylmaleimide suggest that the activity resembles but is not identical to DNA polymerase gamma (formerly called R-DNA polymerase). The membrane fraction also contains a minor activity which is due to polymerase beta, the low molecular weight (3.5 S) nuclear enzyme.




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