Linear fusigen as the major hydroxamate siderophore of the ectomycorrhizal Basidiomycota Laccaria laccata and Laccaria bicolor |
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Authors: | Kurt Haselwandter Gerlinde Häninger Markus Ganzera Hubertus Haas Graeme Nicholson Günther Winkelmann |
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Institution: | 1. Department of Microbiology, University of Innsbruck, Technikerstr. 25, 6020, Innsbruck, Austria 2. Institute of Pharmacy, Pharmacognosy, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria 3. Division of Molecular Biology/Biocenter, Innsbruck Medical University, Innrain 80-82, 6020, Innsbruck, Austria 4. Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany 5. Institute of Microbiology and Biotechnology, University of Tübingen, 72076, Tübingen, Germany
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Abstract: | A screening for siderophores produced by the ectomycorrhizal fungi Laccaria laccata and Laccaria bicolor in synthetic low iron medium revealed the release of several different hydroxamate siderophores of which four major siderophores could be identified by high resolution mass spectrometry. While ferricrocin, coprogen and triacetylfusarinine C were assigned as well as other known fungal siderophores, a major peak of the siderophore mixture revealed an average molecular mass of 797 for the iron-loaded compound. High resolution mass spectrometry indicated an absolute mass of m/z = 798.30973 (M + H]+). With a relative error of Δ = 0.56 ppm this corresponds to linear fusigen (C33H52N6O13Fe; MW = 797.3). The production of large amounts of linear fusigen by these basidiomycetous mycorrhizal fungi may possibly explain the observed suppression of plant pathogenic Fusarium species. For comparative purposes Fusarium roseum was included in this study as a well known producer of cyclic and linear fusigen. |
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