Protein kinase and HDAC inhibitors from the endophytic fungus Epicoccum nigrum

J Nat Prod. 2014 Jan 24;77(1):49-56. doi: 10.1021/np4005745. Epub 2013 Dec 16.

Abstract

A chemical investigation of the endophytic fungus Epicoccum nigrum isolated from leaves of Mentha suaveolens collected in Morocco resulted in the isolation of five new polyketides, epicocconigrones A and B (1 and 2), 3-methoxyepicoccone B (3), 3-methoxyepicoccone (4), and 2,3,4-trihydroxy-6-(methoxymethyl)-5-methylbenzaldehyde (5), together with five known compounds (6-10). The structures of the new compounds were unambiguously determined by extensive analysis of the 1D and 2D NMR and mass spectroscopic data. Compounds 1 and 10 showed potent inhibition of at least 15 protein kinases with IC50 values ranging from 0.07 to 9.00 μM. Moreover, compounds 1 and 10 inhibited histone deacetylase (HDAC) activities with IC50 values of 9.8 and 14.2 μM, respectively. A preliminary structure-activity relationship is discussed. Interestingly, compounds 1 and 10 exert mainly cytostatic effects in human lymphoma RAJI and U-937 cell lines.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ascomycota / chemistry*
  • Drug Screening Assays, Antitumor
  • Histone Deacetylase Inhibitors / chemistry
  • Histone Deacetylase Inhibitors / isolation & purification*
  • Histone Deacetylase Inhibitors / pharmacology*
  • Humans
  • Inhibitory Concentration 50
  • Mentha / microbiology*
  • Molecular Structure
  • Morocco
  • Nuclear Magnetic Resonance, Biomolecular
  • Plant Leaves / microbiology
  • Polyketides / chemistry
  • Polyketides / isolation & purification*
  • Polyketides / pharmacology*
  • Protein Kinase Inhibitors / chemistry
  • Protein Kinase Inhibitors / isolation & purification*
  • Protein Kinase Inhibitors / pharmacology*
  • Protein Kinases
  • Structure-Activity Relationship

Substances

  • Histone Deacetylase Inhibitors
  • Polyketides
  • Protein Kinase Inhibitors
  • Protein Kinases