HPLC-DAD-Directed Isolation of Linearly Fused Prenylated Indole Alkaloids from a Soil-Derived Aspergillus versicolor

J Nat Prod. 2019 Aug 23;82(8):2181-2188. doi: 10.1021/acs.jnatprod.9b00183. Epub 2019 Aug 7.

Abstract

An HPLC-DAD-directed chemical investigation of the soil-derived fungus Aspergillus versicolor QC812 resulted in the isolation and identification of eight new linearly fused prenylated indole alkaloids, asperversiamides I-P (1-8), along with a congener, asperversiamide H (9). Their structures and absolute configurations were determined by spectroscopic analysis including HRESIMS and 1D and 2D NMR, electronic circular dichroism analysis, and single-crystal X-ray diffraction. Asperversiamide I (1), the first diketopiperazine derived from d-proline and l-tryptophan, possesses an unprecedented C-11-spiro-fused 6/6/5/5/6/5 hexacyclic ring system. Asperversiamide J (2) is the first linearly fused 6/6/5 tricyclic prenylated indole alkaloid to be reported. 1 and 2 showed moderate inhibitory activities against HeLa cells with IC50 values of 7.3 and 6.4 μM, respectively.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aspergillus / chemistry*
  • Chromatography, High Pressure Liquid / methods*
  • Crystallography, X-Ray
  • Indole Alkaloids / chemistry
  • Indole Alkaloids / isolation & purification*
  • Prenylation
  • Soil Microbiology*
  • Spectrum Analysis / methods*

Substances

  • Indole Alkaloids