Heteronuclear NMR studies of metabolites produced by Cryptococcus neoformans in culture media: Identification of possible virulence factors
✍ Scribed by William A. Bubb; Lesley C. Wright; Michelle Cagney; Rosemary T. Santangelo; Tania C. Sorrell; Philip W. Kuchel
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 108 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
The yeast, Cryptococcus neoformans var. neoformans is a major contributor to the morbidity and mortality experienced by the immunosuppressed population. With a view to providing better treatment, identification of cryptococcal virulence factors is an important goal, with most effort to date directed toward the significance of structural variations in the polysaccharide capsule. The present work describes the characterization of supernatants obtained from cryptococcal cultures. This was achieved by thorough identification of the spin systems of individual metabolites through both homonuclear and heteronuclear NMR experiments that circumvented the difficulties imposed by limited dispersion and a range of concentrations in different cultures covering more than 3 orders of magnitude. More than 30 metabolites, including amino acids, alditols, nucleosides, acetate, and ethanol, were identified by their 1 H and 13 C chemical shifts and observed long-range correlations. The possible contribution of some detected substances to the pathogenicity of Cryptococcus neoformans is discussed. Magn Reson Med 42:442-453