期刊
GLYCOBIOLOGY
卷 21, 期 7, 页码 973-984出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/glycob/cwr030
关键词
GLYCAM; PSL; influenza viral adhesion; lectin; molecular dynamics
资金
- National Institutes of Health [GM055230, GM094919]
- Science Foundation of Ireland [08/IN.1/B2070]
- Grants-in-Aid for Scientific Research [21370062] Funding Source: KAKEN
Glycan chains that terminate in sialic acid (Neu5Ac) are frequently the receptors targeted by pathogens for initial adhesion. Carbohydrate-binding proteins (lectins) with specificity for Neu5Ac are particularly useful in the detection and isolation of sialylated glycoconjugates, such as those associated with pathogen adhesion as well as those characteristic of several diseases including cancer. Structural studies of lectins are essential in order to understand the origin of their specificity, which is particularly important when employing such reagents as diagnostic tools. Here, we report a crystallographic and molecular dynamics (MD) analysis of a lectin from Polyporus squamosus (PSL) that is specific for glycans terminating with the sequence Neu5Ac alpha 2-6Gal beta. Because of its importance as a histological reagent, the PSL structure was solved (to 1.7 A) in complex with a trisaccharide, whose sequence (Neu5Ac alpha 2-6Gal beta 1-4GlcNAc) is exploited by influenza A hemagglutinin for viral adhesion to human tissue. The structural data illuminate the origin of the high specificity of PSL for the Neu5Ac alpha 2-6Gal sequence. Theoretical binding free energies derived from the MD data confirm the key interactions identified crystallographically and provide additional insight into the relative contributions from each amino acid, as well as estimates of the importance of entropic and enthalpic contributions to binding.
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