Plant-derived antifungal agent poacic acid targets β-1,3-glucan

Proc Natl Acad Sci U S A. 2015 Mar 24;112(12):E1490-7. doi: 10.1073/pnas.1410400112. Epub 2015 Mar 9.

Abstract

A rise in resistance to current antifungals necessitates strategies to identify alternative sources of effective fungicides. We report the discovery of poacic acid, a potent antifungal compound found in lignocellulosic hydrolysates of grasses. Chemical genomics using Saccharomyces cerevisiae showed that loss of cell wall synthesis and maintenance genes conferred increased sensitivity to poacic acid. Morphological analysis revealed that cells treated with poacic acid behaved similarly to cells treated with other cell wall-targeting drugs and mutants with deletions in genes involved in processes related to cell wall biogenesis. Poacic acid causes rapid cell lysis and is synergistic with caspofungin and fluconazole. The cellular target was identified; poacic acid localized to the cell wall and inhibited β-1,3-glucan synthesis in vivo and in vitro, apparently by directly binding β-1,3-glucan. Through its activity on the glucan layer, poacic acid inhibits growth of the fungi Sclerotinia sclerotiorum and Alternaria solani as well as the oomycete Phytophthora sojae. A single application of poacic acid to leaves infected with the broad-range fungal pathogen S. sclerotiorum substantially reduced lesion development. The discovery of poacic acid as a natural antifungal agent targeting β-1,3-glucan highlights the potential side use of products generated in the processing of renewable biomass toward biofuels as a source of valuable bioactive compounds and further clarifies the nature and mechanism of fermentation inhibitors found in lignocellulosic hydrolysates.

Keywords: Saccharomyces cerevisiae; chemical genomics; fungal cell wall; high-dimensional morphometrics; lignocellulosic hydrolysates.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Caspofungin
  • Cell Membrane / metabolism
  • Cell Wall / metabolism
  • Coumaric Acids / chemistry*
  • Dose-Response Relationship, Drug
  • Drug Synergism
  • Echinocandins / chemistry
  • Fungicides, Industrial / chemistry*
  • Genomics
  • Hydrolysis
  • Inhibitory Concentration 50
  • Lignin / chemistry
  • Lipopeptides
  • Plant Extracts / chemistry
  • Poaceae / chemistry*
  • Saccharomyces cerevisiae / drug effects*
  • Saccharomyces cerevisiae / metabolism
  • Stilbenes / chemistry*
  • beta-Glucans / chemistry*

Substances

  • Coumaric Acids
  • Echinocandins
  • Fungicides, Industrial
  • Lipopeptides
  • Plant Extracts
  • Stilbenes
  • beta-Glucans
  • poacic acid
  • lignocellulose
  • Lignin
  • beta-1,3-glucan
  • Caspofungin