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. 1983 Jun 11;11(11):3753–3765. doi: 10.1093/nar/11.11.3753

Uracil in deoxyribonucleotide polymers reduces their template-primer activity for E. coli DNA polymerase I.

J A Vilpo, J Ridell
PMCID: PMC326000  PMID: 6344014

Abstract

The physical and biochemical properties of two pairs of synthetic DNA template-primers were investigated. The copolymer poly(dA-dU) . poly(dA-dU) and the homopolymer duplex poly(dA). poly(dU) were characterized by a lower Tm and by a higher buoyant density value than the respective thymine polynucleotides poly(dA-dT) . poly(dA-dT) and poly(dA) . poly(dT). The polymerizing and the primer terminus adding reactions of a homogenous E. coli DNA polymerase I preparation, as measured by incorporation of [3H]dAMP into the acid-insoluble fraction, were significantly poorer with uracil-containing template-primers than with thymine templates. Moreover, the uracil-containing polynucleotides inhibited the polymerizing activity of DNA polymerase I to a greater extent than the thymine polynucleotides, when the enzymatic activity was investigated with a dATP/dTTP/dUTP-free incorporation system making use of poly(dI-dC) . poly(dI-dC) as the template-primer.

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Selected References

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