Inhibition of DNA polymerase by captan

Biochim Biophys Acta. 1982 Mar 29;696(3):245-52. doi: 10.1016/0167-4781(82)90054-9.


Captan inhibits DNA polymerases of both eukaryotic and prokaryotic sources. When polymerases were employed in assays with various nucleotides as template-primer, no specificity in the base sequence of polynucleotide was required for inhibition. Sucrose gradient centrifugation and preincubation studies showed the inhibition was caused by an irreversible alteration of the polymerase. Captan and DNA compete for the same site on the polymerase, thus DNA can serve a protective role in the elimination of captan's action. The pyrophosphate exchange activity associated with the polymerase is not inhibited by captan and the fidelity with which DNa polymerase I copies the DNA template also is not altered by captan treatment.

Publication types

  • Comparative Study

MeSH terms

  • Animals
  • Captan / pharmacology*
  • Cattle
  • DNA Polymerase I / antagonists & inhibitors
  • DNA Polymerase II / antagonists & inhibitors
  • DNA Polymerase III / antagonists & inhibitors
  • Escherichia coli / enzymology
  • Kinetics
  • Liver / enzymology
  • Nucleic Acid Synthesis Inhibitors*
  • Templates, Genetic
  • Thymus Gland / enzymology


  • Nucleic Acid Synthesis Inhibitors
  • DNA Polymerase I
  • DNA Polymerase II
  • DNA Polymerase III
  • Captan