DNA polymerase β inhibitors from Baeckea gunniana

Jing Zhen Deng, Shelley R. Starck, Sidney M. Hecht

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Crude plant extracts were surveyed for their ability to inhibit DNA polymerase β. A methyl ethyl ketone extract prepared from Baeckea gunniana was identified as a potent inhibitor of the enzyme. Bioassay-guided fractionation of the extract, using an assay to monitor the inhibitory potential of individual fractions toward DNA polymerase β, led to the isolation of four active ursane and oleanane triterpenoids (1-4). Inhibitory principle 1 is a new natural product, and 2 is a novel compound. Their structures were established as 3β-hydroxyurs-12,19(29)-dien-28- oic acid (1) and 3β-hydroxyurs-18,20(30)-dien-28-oic acid (2) by spectroscopic analysis and by comparison with the data for the structurally related compound ursolic acid (4). Also isolated as a DNA polymerase β inhibitor was oleanolic acid (3). Compounds 1-4 had IC50 values of 5.3-8.5 μM as inhibitors of polymerase β in the presence of bovine serum albumin (BSA) and 2.5-4.8 μM in the absence of BSA.

Original languageEnglish (US)
Pages (from-to)1624-1626
Number of pages3
JournalJournal of Natural Products
Issue number12
StatePublished - Dec 1999
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Molecular Medicine
  • Pharmacology
  • Pharmaceutical Science
  • Drug Discovery
  • Complementary and alternative medicine
  • Organic Chemistry


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