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Metabolites of Trichoderma species isolated from damp building materials.

Authors
  • McMullin, David R1
  • Renaud, Justin B2
  • Barasubiye, Tharcisse3
  • Sumarah, Mark W2
  • Miller, J David1
  • 1 a Ottawa Carleton Institute of Chemistry, Carleton University, Ottawa, ON K1S 5B6, Canada. , (Canada)
  • 2 b London Research and Development Centre, Agriculture and Agri-Food Canada, London, ON N5V 4T3, Canada. , (Canada)
  • 3 c Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada. , (Canada)
Type
Published Article
Journal
Canadian Journal of Microbiology
Publisher
Canadian Science Publishing
Publication Date
Jul 01, 2017
Volume
63
Issue
7
Pages
621–632
Identifiers
DOI: 10.1139/cjm-2017-0083
PMID: 28384416
Source
Medline
Keywords
License
Unknown

Abstract

Buildings that have been flooded often have high concentrations of Trichoderma spores in the air while drying. Inhaled spores and spore and mycelial fragments contain large amounts of fungal glucan and natural products that contribute to the symptoms associated with indoor mould exposures. In this study, we considered both small molecules and peptaibol profiles of T. atroviride, T. koningiopsis, T. citrinoviride, and T. harzianum strains obtained from damp buildings in eastern Canada. Twenty-residue peptaibols and sorbicillin-derived metabolites (1-6) including a new structure, (R)-vertinolide (1), were characterized from T. citrinoviride. Trichoderma koningiopsis produced several koninginins (7-10), trikoningin KA V, and the 11-residue lipopeptaibols trikoningin KB I and trikoningin KB II. Trichoderma atroviride biosynthesized a mixture of 19-residue trichorzianine-like peptaibols, whereas T. harzianum produced 18-residue trichokindin-like peptaibols and the 11-residue harzianin HB I that was subsequently identified from the studied T. citrinoviride strain. Two α-pyrones, 6-pentyl-pyran-2-one (11) and an oxidized analog (12), were produced by both T. atroviride and T. harzianum. Aside from exposure to low molecular weight natural products, inhalation of Trichoderma spores and mycelial fragments may result in exposure to membrane-disrupting peptaibols. This investigation contributes to a more comprehensive understanding of the biologically active natural products produced by fungi commonly found in damp buildings.

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