A simple and rapid purification method for Escherichia coli DNA polymerase I.

Abstract:

We report a simple, three-step method for the purification of Escherichia coli DNA polymerase I. Its advantages over other procedures are ease and rapidity, the absence of an autolysis or any high speed centrifugation step, and applicability to large quantities of material. In addition, RNA polymerase can be isolated as a by-product. We have applied this method to purify DNA polymerase both from wild type E. coli cells and from cells bearing a lambda prophage carrying the polA gene (Kelley, W.S., Chalmers, K., and Murray, N.E. (1977) Proc. Natl. Acad. Sci. U.S.A. 74, 5632-5636). This latter source amplifies the amount of DNA polymerase in the cells by at least 10-fold.

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