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Programme: Collaborative Research Center 1127: Chemical Mediators in Complex Biosystems - ChemBioSys1
Author: Sagar Gore1
Melleolides impact fungal translation via elongation factor 2.

Abstract (Expand)

Melleolides from the honey mushroom Armillaria mellea represent a structurally diverse group of polyketide-sesquiterpene hybrids. Among various bioactivites, melleolides show antifungal effects against … Aspergillus and other fungi. This bioactivity depends on a Delta2,4-double bond present in dihydroarmillylorsellinate (DAO) or arnamial, for example. Yet, the mode of action of Delta2,4-unsaturated, antifungal melleolides has been unknown. Here, we report on the molecular target of DAO in the fungus Aspergillus nidulans. Using a combination of synthetic chemistry to create a DAO-labelled probe, protein pulldown assays, MALDI-TOF-based peptide analysis and western blotting, we identify the eukaryotic translation elongation factor 2 (eEF2) as a binding partner of DAO. We confirm the inhibition of protein biosynthesis in vivo with an engineered A. nidulans strain producing the red fluorescent protein mCherry. Our work suggests a binding site dissimilar from that of the protein biosynthesis inhibitor sordarin, and highlights translational elongation as a valid antifungal drug target.

Authors: M. Dorfer, D. Heine, S. Konig, S. Gore, O. Werz, C. Hertweck, M. Gressler, D. Hoffmeister

Date Published: 15th May 2019

Publication Type: Journal

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