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. 1975 Feb;145(2):215–224. doi: 10.1042/bj1450215

Deoxyribonucleic acid polymerases of BHK-21/C13 cells. Partial purification and characterization of the enzymes.

R K Craig, H M Keir
PMCID: PMC1165210  PMID: 239680

Abstract

DNA polymerase from BHK-21/C13 cells were separated into two species, DNA polymerase I corresponding to the heterogeneous enzyme with sedimentation coefficient of 6-8S, and DNA polymerase II, corresponding to the enzyme with sedimentation coefficient of 3.3S. DNA polymerase I was purified 114-fold and DNA polymerase II 154-fold by a simple extraction procedure followed by column chromatography on phosphocellulose and gel filtration through Sephadex G-100. The purified enzymes differed markedly in respect of pH optimum, stimulation and inhibition by K+, Km for the deoxyribonucleoside 5'-triphosphates, stability to heating at 45 degrees C, and inhibition by N-ethylmaleimide. The preferred primer-template for both enzymes was "activated" DNA (DNA submitted to limited degradation by pancreatic deoxyribonuclease); native or thermally denatured DNA templates were relatively very poorly copied. When certain synthetic templates were tested, substantial differences were revealed between the two enzymes. Poly[d(A-T)] was poorly used by polymerase I but was superior to "activated" DNA for polymerase II. Poly[d(A)]-oligo[d(pT)10] was used efficiently by polymerase I but not by polymerase II. Poly(A)-oligo[d(pT)10] was not an effective primer-template although polymerase I could use it to a limited extent when Mn2+ replaced Mg2+ in the polymerase reaction and when the temperature of incubation was lowered from 37 degrees to 30 degrees C. When only one or two or three triphosphates were supplied in the reaction mixture, the activity of polymerase I was more severly diminished than that of polymerase II.

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Selected References

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