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Scientific article
English

Rapid characterization of aquatic hyphomycetes by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

Published inMycologia, vol. 111, no. 1, p. 177-189
Publication date2019
First online date2019-01-14
Abstract

Protein fingerprinting using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI--TOF MS) is a rapid, reliable, and economical method to characterize isolates of terrestrial fungi and other microorganisms. The objective of our study was to evaluate the suitability of MALDI-TOF MS for the identification of aquatic hyphomycetes, a polyphyletic group of fungi that play crucial roles in stream ecosystems. To this end, we used 34 isolates of 21 aquatic hyphomycete species whose identity was confirmed by spore morphology and internal transcribed spacer (ITS1-5.8S-ITS2 = ITS) nuc rDNA sequencing. We tested the efficiency of three protein extraction methods, including chemical and mechanical treatments using 13 different protocols, with the objective of producing high-quality MALDI-TOF mass spectra. In addition to extraction protocols, mycelium age was identified as a key parameter affecting protein extraction efficiency. The dendrogram based on mass-spectrum similarity indicated good and relevant taxonomic discrimination; the tree structure was comparable to that of the phylogram based on ITS sequences. Consequently, MALDI-TOF MS could reliably identify the isolates studied and provided greater taxonomic accuracy than classical morphological methods. MALDI-TOF MS seems suited for rapid characterization and identification of aquatic hyphomycete species.

eng
Keywords
  • Aquatic fungi
  • ITS sequencing
  • Mass spectrometry
  • Morphology
  • Phylogeny
  • Proteomics
  • Taxonomy
  • Cluster Analysis
  • France
  • Fungal Proteins / analysis
  • Mitosporic Fungi / chemistry
  • Mitosporic Fungi / classification
  • Water Microbiology
  • Spectrometry
  • Mass
  • Matrix-Assisted Laser Desorption-Ionization
Citation (ISO format)
CORNUT, Julien et al. Rapid characterization of aquatic hyphomycetes by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. In: Mycologia, 2019, vol. 111, n° 1, p. 177–189. doi: 10.1080/00275514.2018.1528129
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ISSN of the journal0027-5514
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