1nnc
From Proteopedia
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'''INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) COMPLEXED WITH 4-GUANIDINO-NEU5AC2EN INHIBITOR''' | '''INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) COMPLEXED WITH 4-GUANIDINO-NEU5AC2EN INHIBITOR''' | ||
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[[Category: Colman, P M.]] | [[Category: Colman, P M.]] | ||
[[Category: Varghese, J N.]] | [[Category: Varghese, J N.]] | ||
| - | [[Category: | + | [[Category: Neuraminidase]] |
| - | [[Category: | + | [[Category: Sialidase]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:44:37 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 23:44, 2 May 2008
INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) COMPLEXED WITH 4-GUANIDINO-NEU5AC2EN INHIBITOR
Overview
The three-dimensional X-ray structure of a complex of the potent neuraminidase inhibitor 4-guanidino-Neu5Ac2en and influenza virus neuraminidase (Subtype N9) has been obtained utilizing diffraction data to 1.8 A resolution. The interactions of the inhibitor, solvent water molecules, and the active site residues have been accurately determined. Six water molecules bound in the native structure have been displaced by the inhibitor, and the active site residues show no significant conformational changes on binding. Sialic acid, the natural substrate, binds in a half-chair conformation that is isosteric to the inhibitor. The conformation of the inhibitor in the active site of the X-ray structure concurs with that obtained by theoretical calculations and validates the structure-based design of the inhibitor. Comparison of known high-resolution structures of neuraminidase subtypes N2, N9, and B shows good structural conservation of the active site protein atoms, but the location of the water molecules in the respective active sites is less conserved. In particular, the environment of the 4-guanidino group of the inhibitor is strongly conserved and is the basis for the antiviral action of the inhibitor across all presently known influenza strains. Differences in the solvent structure in the active site may be related to variation in the affinities of inhibitors to different subtypes of neuraminidase.
About this Structure
1NNC is a Single protein structure of sequence from Unidentified influenza virus. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure of the complex of 4-guanidino-Neu5Ac2en and influenza virus neuraminidase., Varghese JN, Epa VC, Colman PM, Protein Sci. 1995 Jun;4(6):1081-7. PMID:7549872 Page seeded by OCA on Sat May 3 02:44:37 2008
