Journal
GLYCOBIOLOGY
Volume 12, Issue 8, Pages 499-505Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/glycob/cwf059
Keywords
cyst wall; Giardia; H-1 NMR spectroscopy; mass spectrometry; polysaccharide
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Funding
- NIAID NIH HHS [AI 41230] Funding Source: Medline
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Assembly of a protective cyst wall by Giardia is essential for the survival of the parasite outside the host intestine and for transmission among susceptible hosts. The structure of the G. intestinalis filamentous cyst wall was studied by chemical methods, mass spectrometry, and H-1 nuclear magnetic resonance spectroscopy. Isolated cyst wall material contains carbohydrate and protein in a ratio of 3:2 (w/w), and the carbohydrate moiety is composed of a beta(1-3)-N-acetyl-D-galactopyranosamine homopolymer. Conformational analysis by molecular dynamics and persistence length calculations of GalNAc oligomers in solution demonstrated a flexible structure consisting of left- and right-handed helical elements. It is most likely that in the solid state, the polysaccharide forms ordered helices or possibly multiple helical structures having strong interchain interactions. The highly insoluble nature of the Giardia cyst wall must be due to these strong interchain interactions and, probably, a strong association between the carbohydrate and the protein moiety.
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