Effect of 6-mercaptopurine ribonucleotides on DNA-dependent RNA polymerase activity

R. T. Kawahata, C. A. Holmberg, Bennie Osburn, L. F. Chuang, R. Y. Chuang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


6-Mercaptopurine ribonucleoside 5'-triphosphate was found to be an inhibitor of DNA-dependent RNA polymerases from Escherichia coli and chicken myeloblastosis cells. The inhibitor appears to compete with GTP for its binding to RNA polymerase, resulting in a reduction of RNA chain initiations. Neither 6-mercaptopurine ribonucleoside nor its monophosphate derivative caused the inhibition. These studies suggest that the antineoplastic action of 6-mercaptopurine may in part be owing to the inhibition of the activity of DNA-dependent RNA polymerase, resulting in an inhibition of cellular RNA synthesis.

Original languageEnglish (US)
Pages (from-to)503-506
Number of pages4
JournalMolecular Pharmacology
Issue number3
StatePublished - Dec 1 1980

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology


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