A Dereplication and Bioguided Discovery Approach to Reveal New Compounds from a Marine-Derived Fungus Stilbella fimetaria

Sara Kildgaard, Karolina Subko, Emma Phillips, Violaine Goidts, Mercedes de la Cruz, Caridad Díaz, Charlotte Held Gotfredsen, Birgitte Andersen, Jens Christian Frisvad, Kristian Fog Nielsen, Thomas Ostenfeld Larsen

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Abstract

A marine-derived Stilbella fimetaria fungal strain was screened for new bioactive compounds based on two different approaches: (i) bio-guided approach using cytotoxicity and antimicrobial bioassays; and (ii) dereplication based approach using liquid chromatography with both diode array detection and high resolution mass spectrometry. This led to the discovery of several bioactive compound families with different biosynthetic origins, including pimarane-type diterpenoids and hybrid polyketide-non ribosomal peptide derived compounds. Prefractionation before bioassay screening proved to be a great aid in the dereplication process, since separate fractions displaying different bioactivities allowed a quick tentative identification of known antimicrobial compounds and of potential new analogues. A new pimarane-type diterpene, myrocin F, was discovered in trace amounts and displayed cytotoxicity towards various cancer cell lines. Further media optimization led to increased production followed by the purification and bioactivity screening of several new and known pimarane-type diterpenoids. A known broad-spectrum antifungal compound, ilicicolin H, was purified along with two new analogues, hydroxyl-ilicicolin H and ilicicolin I, and their antifungal activity was evaluated.
Original languageEnglish
Article number253
JournalMarine Drugs
Volume15
Issue number8
ISSN1660-3397
DOIs
Publication statusPublished - 2017

Bibliographical note

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license.

Keywords

  • MS/HRMS
  • Antifungal
  • Bioguided-discovery
  • Cytotoxicity
  • Dereplication
  • Ilicicolin H
  • Marine-derived
  • Pimarane-type diterpenoids

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