Induced sclerotium formation exposes new bioactive metabolites from Aspergillus sclerotiicarbonarius

J Antibiot (Tokyo). 2015 Oct;68(10):603-8. doi: 10.1038/ja.2015.40. Epub 2015 May 6.

Abstract

Sclerotia are known to be fungal survival structures, and induction of sclerotia may prompt production of otherwise undiscovered metabolites. Aspergillus sclerotiicarbonarius (IBT 28362) was investigated under sclerotium producing conditions, which revealed a highly altered metabolic profile. Four new compounds were isolated from cultivation under sclerotium formation conditions and their structures elucidated using different analytical techniques (HRMS, UV, 1D and 2D NMR). This included sclerolizine, an alkylated and oxidized pyrrolizine, the new emindole analog emindole SC and two new carbonarins; carbonarins I and J. We have identified the three latter as true sclerotial metabolites. All metabolites were tested for antifungal and antiinsectan activity, and sclerolizine and carbonarin I displayed antifungal activity against Candida albicans, while all four showed antiinsectan activity. These results demonstrate induction of sclerotia as an alternative way of triggering otherwise silent biosynthetic pathways in filamentous fungi for the discovery of novel bioactive secondary metabolites.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antifungal Agents / chemistry
  • Antifungal Agents / isolation & purification
  • Antifungal Agents / pharmacology
  • Aspergillus / chemistry*
  • Aspergillus / metabolism
  • Candida albicans / drug effects
  • Chromatography, High Pressure Liquid
  • Culture Media
  • Heterocyclic Compounds, 2-Ring / chemistry*
  • Heterocyclic Compounds, 2-Ring / isolation & purification
  • Heterocyclic Compounds, 2-Ring / pharmacology*
  • Microbial Sensitivity Tests
  • Pyrroles / chemistry*
  • Pyrroles / isolation & purification
  • Pyrroles / pharmacology*
  • Spectrophotometry, Ultraviolet

Substances

  • Antifungal Agents
  • Culture Media
  • Heterocyclic Compounds, 2-Ring
  • Pyrroles
  • sclerolizine