DNA polymerases of rabbit mammary gland: partial purification, characterization and changes in DNA polymerase activities as a function of physiological state.

Abstract:

DNA polymerases alpha and beta were partially purified from rabbit mammary gland, and their properties were examined. Many of these properties (sedimentation coefficients, pH optima, divalent cation requirements, sensitivity to various inhibitors) are similar to those commonly regarded as typical of eukaryotic DNA polymerases alpha and beta. Effect of stage of pregnancy and lactation on the levels of activity of DNA polymerases alpha, beta and gamma in rabbit mammary gland was examined. These experiments reveal a considerable variation of DNA polymerase-alpha activity; the highest enzyme activity is observed on day-20 of pregnancy and on day-1 of lactation.

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