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J. Biol. Chem., Vol. 258, Issue 15, 9037-9039, Aug, 1983

Association of DNA primase with the beta/gamma subunits of DNA polymerase alpha from Drosophila melanogaster embryos

LS Kaguni, JM Rossignol, RC Conaway, GR Banks and IR Lehman

The DNA polymerase and primase activities of the intact DNA polymerase alpha from early embryos of Drosophila melanogaster co-sediment in native glycerol gradients. However, the activities are separated in glycerol gradients containing 2.8 M urea after treatment of the enzyme with 3.4 M urea. The 182,000-dalton alpha subunit which is required for DNA polymerase activity (Kaguni, L.S., Rossignol, J.-M., Conaway, R. C., and Lehman, I.R. (1983) Proc. Natl. Acad. Sci. U. S.A. 80, 2221- 2225) is not required for DNA primase activity. Instead, primase activity resides in the 60,000-dalton (beta) and/or the 50,000-dalton (gamma) subunit. Neither polymerase nor primase has been found in association with the 73,000-dalton polypeptide which co-purifies with the intact enzyme.
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