Characterization of sphingolipids from mycopathogens: Factors correlating with expression of 2-hydroxy fatty acyl (E)-Delta(3)-unsaturation in cerebrosides of Paracoccidioides brasiliensis and Aspergillus fumigatus

Characterization of sphingolipids from mycopathogens: Factors correlating with expression of 2-hydroxy fatty acyl (E)-Delta(3)-unsaturation in cerebrosides of Paracoccidioides brasiliensis and Aspergillus fumigatus

Autor Toledo, M. S. Google Scholar
Levery, S. B. Google Scholar
Straus, A. H. Google Scholar
Suzuki, E. Google Scholar
Momany, M. Google Scholar
Glushka, J. Google Scholar
Moulton, J. M. Google Scholar
Takahashi, H. K. Google Scholar
Instituição Univ Georgia
Universidade Federal de São Paulo (UNIFESP)
Resumo Significant differences exist between mammals and fungi with respect to glycosphingolipid (GSL) structure and biosynthesis. Thus, these compounds, as well as the cellular machinery regulating their expression, have considerable potential as targets for the diagnosis and treatment of fungal diseases. in this study, the major neutral GSL components extracted from both yeast and mycelium forms of the thermally dimorphic mycopathogen Paracoccidioides brasiliensis were purified and characterized by H-1 and C-13 NMR spectroscopy, ESI-MS and ESI-MS/CID-MS, and GC-MS. the major GSLs of both forms were identified as beta-glucopyranosylceramides (GlcCer) having (4,8E)-9- methyl-4,8-sphingadienine as long chain base in combination with either N-2'-hydroxyoctadecanoate or N-2'-hydroxy-(E)-3'-octadecenoate. the mycelium form GlcCer had both fatty acids in a similar to 1:1 ratio, while that of the yeast form had on average only similar to 15% of the (E)-Delta(3)-unsaturated fatty acid. Cerebrosides from two strains of Aspergillus fumigatus (237 and ATCC 9197) expressing both GalCer and GlcCer were also purified and characterized by similar methods. the GalCer fractions were found to have similar to 70% and similar to 90% N-2'-hydroxy-(E)-3'-octadecenoate, respectively, in the two strains. in contrast, the GlcCer fractions had N-2'-hydroxy-(E)3'-octadecenoate at only similar to 20 and similar to 50%, respectively. the remainder in all cases was the saturated 2-OH fatty acid, which has not been previously reported in cerebrosides from A. fumigatus. the availability of detailed structures of both glycosylinositol phosphorylceramides [Levery, S. B., Toledo, M. S., Straus, A. H. and Takahashi, H. K. (1998) Biochemistry 37, 8764-8775] and cerebrosides from P. brasilienisis revealed parallel quantitative differences in expression between yeast and mycelium forms, as well as a striking general partitioning of ceramide structure between the two classes of GSLs. These results are discussed with respect to possible functional roles for fungal sphingolipids, particularly as they relate to the morphological transitions exhibited by P. brasiliensis.
Idioma Inglês
Data de publicação 1999-06-01
Publicado em Biochemistry. Washington: Amer Chemical Soc, v. 38, n. 22, p. 7294-7306, 1999.
ISSN 0006-2960 (Sherpa/Romeo, fator de impacto)
Publicador Amer Chemical Soc
Extensão 7294-7306
Fonte http://dx.doi.org/10.1021/bi982898z
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000080691200033
Endereço permanente http://repositorio.unifesp.br/handle/11600/26090

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