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Quantitative effects of inhibitors of the replicative DNA polymerases (pol) alpha, delta and epsilon from calf thymus are reported under similar assay conditions. Carbonyldiphosphonate was a competitive inhibitor of pols delta and epsilon, with 4- to 6-fold selectivity compared to pol alpha. Aphidicolin inhibited pols alpha and delta with 6- to 10-fold selectivity compared to pol epsilon. The 'butylphenyl' nucleotides, BuPdGTP and BuAdATP, inhibited pol alpha with at least 1000-fold selectivity compared to pols delta and epsilon. The use of these inhibitors under similar assay conditions permits the discrimination of the three enzymes.
Wright et al. (Mon,) studied this question.
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