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Title

Carbohydrate moiety of Plasmodium falciparum glycoproteins: the nature of the carbohydrate-peptide linkage in the MSP-2 glycoprotein
Authors
Khan, A. H.
Qazi, A. M.
Hoessli, Daniel
Torred-Duarte, A. P.
Senaldi, G.
Qazi, M. H.
Walker-Nasir, Evelyne
Nasir ud, Din
Published in Biochemistry & Molecular Biology International. 1997, vol. 43, no. 3, p. 655-668
Abstract Metabolic labelling of Plasmodium falciparum parasites with [3H]GlcN, [3H]Man, [3H]Gal and [3H]ethanolamine, and subsequent purification by SDS-PAGE of the labelled material provided effective labelling of the MSP-1, 195 kDa, and MSP-2, 42-53 kDa, glycoproteins. Reductive beta-elimination of the MSP-2 released from the gel consisted of glycopeptides containing labelled sugars. Processing of the eliminated components and identification of the sugar residues demonstrated the presence of N-acetylglucosaminitol and N-acetylgalactosaminitol amongst other labelled sugars. Reductive beta-elimination with sodium hydroxide-sodium borotritide-borohydride showed the presence of glucosaminitol and alanine in the hydrolysis products. The MSP-2 was retained on solid phase wheat-germ agglutinin and was released from the lectin by treatment with GlcNAc. Upon treatment with O-glycanase the MSP-2 glycoprotein released labelled amino sugar, and derived oligosaccharides on treatment with exoglycosidases released labelled components corresponding to the metabolically incorporated sugars. Labelled Gal was incorporated into the MSP-2 glycoprotein using [3H]UDP-Gal and galactosyltransferase. The galactosylated glycoprotein released labelled Gal upon treatment with beta-galactosidase. The results of the present study suggest that the carbohydrate chains of the MSP-2 glycoprotein are attached to the protein backbone via GlcNAc- and GalNAc-serine/threonine in O-glycosyl linkage and the glycoprotein has terminal GlcNAc and Gal residues. The carbohydrate moieties of MSP-2, glycoprotein consist mainly of short chains linked to the protein core.
Keywords Animals — Antigens, Bacterial — Bacterial Outer Membrane Proteins — Bacterial Proteins/ chemistry/metabolism — Carbohydrates/ analysis — Chromatography/methods — Glycoproteins/ chemistry/metabolism — Glycosylation — Plasmodium falciparum/ chemistry/metabolism — Precipitin Tests — Protozoan Proteins/ chemistry/metabolism
Identifiers
PMID: 9352084
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Other version: http://onlinelibrary.wiley.com/doi/10.1080/15216549700204461/pdf
Citation
(ISO format) 		KHAN, A. H. et al. Carbohydrate moiety of Plasmodium falciparum glycoproteins: the nature of the carbohydrate-peptide linkage in the MSP-2 glycoprotein. In: Biochemistry & Molecular Biology International, 1997, vol. 43, n° 3, p. 655-668. https://archive-ouverte.unige.ch/unige:11076

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Deposited on : 2010-08-27

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