Molecular modeling of sialyloligosaccharide fragments into the active site of influenza virus N9 neuraminidase |
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Authors: | Veluraja K Suresh M X Christlet T H Rafi Z A |
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Institution: | Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, India. bio@md3.vsnl.net.in |
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Abstract: | Molecular modeling studies have been carried out to investigate the interactions between substrate sialyloligosaccharide (SOS) fragments bearing different glycosidic linkages and influenza virus N9 neuraminidase, a surface glycoprotein of influenza virus subtype N9. The studies revealed that the allowed orientation for sialic acid (SA) is less than 1% in the Eulerian space at the active site. The active site of this enzyme has enough space to accommodate various SOS fragments, NeuNAcalpha(2-3)Gal, NeuNAcalpha(2-6)Gal, NeuNAcalpha(2-8)NeuNAc and NeuNAcalpha(2-9)NeuNAc, but on specific conformations. In the bound conformation, among these substrates there exists a conformational similarity leading to a structural similarity, which may be an essential requirement for the cleavage activity of the neuraminidases irrespective of the type of glycosidic linkage. |
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