Intimate bacterial-fungal interaction triggers biosynthesis of archetypal polyketides in Aspergillus nidulans

Volker Schroeckh, Kirstin Scherlach, Hans-Wilhelm Nuetzmann, Ekaterina Shelest, Wolfgang Schmidt-Heck, Julia Schuemann, Karin Martin, Christian Hertweck, Axel A Brakhage

Research output: Contribution to journalArticlepeer-review

397 Citations (Scopus)

Abstract

Fungi produce numerous low molecular weight molecules endowed with a multitude of biological activities. However, mining the full-genome sequences of fungi indicates that their potential to produce secondary metabolites is greatly underestimated. Because most of the biosynthesis gene clusters are silent under laboratory conditions, one of the major challenges is to understand the physiological conditions under which these genes are activated. Thus, we cocultivated the important model fungus Aspergillus nidulans with a collection of 58 soil-dwelling actinomycetes. By microarray analyses of both Aspergillus secondary metabolism and full-genome arrays and Northern blot and quantitative RT-PCR analyses, we demonstrate at the molecular level that a distinct fungal-bacterial interaction leads to the specific activation of fungal secondary metabolism genes. Most surprisingly, dialysis experiments and electron microscopy indicated that an intimate physical interaction of the bacterial and fungal mycelia is required to elicit the specific response. Gene knockout experiments provided evidence that one induced gene cluster codes for the long-sought after polyketide synthase (PKS) required for the biosynthesis of the archetypal polyketide orsellinic acid, the typical lichen metabolite lecanoric acid, and the cathepsin K inhibitors F-9775A and F-9775B. A phylogenetic analysis demonstrates that orthologs of this PKS are widespread in nature in all major fungal groups, including mycobionts of lichens. These results provide evidence of specific interaction among microorganisms belonging to different domains and support the hypothesis that not only diffusible signals but intimate physical interactions contribute to the communication among microorganisms and induction of otherwise silent biosynthesis genes.

Original languageEnglish
Pages (from-to)14558-63
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number34
DOIs
Publication statusPublished - 25 Aug 2009

Keywords

  • Actinobacteria
  • Aspergillus nidulans
  • Blotting, Northern
  • Chromatography, High Pressure Liquid
  • Ecosystem
  • Fungal Proteins
  • Gene Expression Profiling
  • Gene Expression Regulation, Fungal
  • Genome, Fungal
  • Macrolides
  • Microscopy, Electron, Scanning
  • Molecular Structure
  • Mutation
  • Mycelium
  • Oligonucleotide Array Sequence Analysis
  • Phylogeny
  • Polyketide Synthases
  • Reverse Transcriptase Polymerase Chain Reaction
  • Salicylates
  • Zearalenone
  • Journal Article
  • Research Support, Non-U.S. Gov't

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