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Originally published In Press as doi:10.1074/jbc.M202295200 on July 22, 2002
J. Biol. Chem., Vol. 277, Issue 40, 37260-37271, October 4, 2002
Candida albicans Phospholipomannan, a New Member of
the Fungal Mannose Inositol Phosphoceramide Family*
Pierre-André
Trinel ,
Emmanuel
Maes§,
Jean-Pierre
Zanetta§,
Florence
Delplace§,
Bernadette
Coddeville§,
Thierry
Jouault ,
Gérard
Strecker§, and
Daniel
Poulain ¶
From the Laboratoire de Mycologie Fondamentale et
Appliquée, Inserm EPI 9915, Faculté de Médecine,
Pôle Recherche, 59037, Lille Cedex, France, and
§ Laboratoire de Glycobiologie Structurale et
Fonctionnelle, CNRS Unité Mixté de Recherche No. 8576, Laboratoire de Chimie Biologique, Université des Sciences et
Technologies de Lille, 59655 Villeneuve d'Ascq, France
The pathogenic yeast Candida albicans
has the ability to synthesize unique sequences of
-1,2-oligomannosides that act as adhesins, induce cytokine
production, and generate protective antibodies. Depending on the growth
conditions, -1,2-oligomannosides are associated with different
carrier molecules in the cell wall. Structural evidence has been
obtained for the presence of these residues in the polysaccharide
moiety of the glycolipid, phospholipomannan (PLM). In this study, the
refinement of purification techniques led to large quantities of PLM
being extracted from Candida albicans cells. A combination
of methanolysis, gas chromatography, mass spectrometry, and nuclear
magnetic resonance analyses allowed the complete structure of PLM to be
deduced. The lipid moiety was shown to consist of a phytoceramide
associating a C18/C20 phytosphingosine and
C25, C26, or mainly C24 hydroxy
fatty acids. The spacer linking the glycan part was identified as a
unique structure: -Man-P-Man-Ins-P-. Therefore, in contrast to the
major class of membranous glycosphingolipids represented by mannose diinositol phosphoceramide, which is derived from mannose
inositol phosphoceramide by the addition of inositol phosphate,
PLM seems to be derived from mannose inositol phosphoceramide by the
addition of mannose phosphate. In relation to a previous study of the
glycan part of the molecule, the assignment of the second phosphorus position leads to the definition of PLM -1,2-oligomannosides as
unbranched linear structures that may reach up to 19 residues in
length. Therefore, PLM appears to be a new type of glycosphingolipid, which is glycosylated extensively through a unique spacer. The conferred hydrophilic properties allow PLM to diffuse into the cell
wall in which together with mannan it presents C. albicans -1,2-oligomannosides to host cells.
*
This work was supported by the "Réseau Infection
Fongique" du Ministère Français de l'Education Nationale
de la Recherche et de la Technologie (MNERT).The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
¶
To whom correspondence should be addressed. Tel.:
33-3-20-62-34-20; Fax: 33-3-20-62-34-16; E-mail:
dan_poulain@compuserve.com.
Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2002 by the American Society for Biochemistry and Molecular Biology.
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