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Glycosylinositolphosphoceramides in Aspergillus fumigatus.

Abstract : Fungal glycosylinositolphosphoceramides (GIPCs) are involved in cell growth and fungal-host interactions. In this study, six GIPCs from the mycelium of the human pathogen Aspergillus fumigatus were purified and characterized using Q-TOF mass spectrometry and 1H, 13C, and 31P NMR. All structures have the same inositolphosphoceramide moiety with the presence of a C(18:0)-phytosphingosine conjugated to a 2-hydroxylated saturated fatty acid (2-hydroxy-lignoceric acid). The carbohydrate moiety defines two types of GIPC. The first, a mannosylated zwitterionic glycosphingolipid contains a glucosamine residue linked in alpha1-2 to an inositol ring that has been described in only two other fungal pathogens. The second type of GIPC presents an alpha-Manp-(1-->3)-alpha-Manp-(1-->2)-IPC common core. A galactofuranose residue is found in four GIPC structures, mainly at the terminal position via a beta1-2 linkage. Interestingly, this galactofuranose residue could be substituted by a choline-phosphate group, as observed only in the GIPC of Acremonium sp., a plant pathogen.
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Catherine Simenel, Bernadette Coddeville, Muriel Delepierre, Jean-Paul Latgé, Thierry Fontaine. Glycosylinositolphosphoceramides in Aspergillus fumigatus.. Glycobiology, Oxford University Press (OUP), 2008, 18 (1), pp.84-96. ⟨10.1093/glycob/cwm122⟩. ⟨pasteur-00366203⟩

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