Bioactive isocoumarins from a terrestrial Streptomyces sp. ANK302

Nat Prod Commun. 2011 Jan;6(1):45-8.

Abstract

Four isocoumarins have been isolated from the terrestrial Streptomyces sp. ANK302, namely 6,8-dimethoxy-3-methylisocoumarin (1), 6,8-dihydroxy-3-methylisocoumarin (2), 6,8-dihydroxy-7-methoxy-3-methylisocoumarin (3), and 6,7,8-trimethoxy-3-methylisocoumarin (4). Compound 1 is a new naturally-occurring isocoumarin, and 2 was isolated as a new bacterial product. The structures 1-4 were deduced from high resolution mass, 1D and 2D NMR spectra and by comparison with related compounds from the literature. Compound 2 showed a strong zoosporicidal activity at a concentration of 5 microg/mL against a phytopathogenic oomycete, Plasmopara viticola, and 1 was active against

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Isocoumarins / chemistry
  • Isocoumarins / isolation & purification*
  • Isocoumarins / pharmacology
  • Magnetic Resonance Spectroscopy
  • Oomycetes / drug effects
  • Streptomyces / metabolism*

Substances

  • Isocoumarins