Three-dimensional structure of the complex of 4-guanidino-Neu5Ac2en and influenza virus neuraminidase.Varghese, J.N., Epa, V.C., Colman, P.M.
(1995) Protein Sci. 4: 1081-1087
- PubMed: 7549872
- DOI: 10.1002/pro.5560040606
- Primary Citation of Related Structures:  1NNC
- PubMed Abstract:
- Structure of the Influenza Virus Glycoprotein Antigen Neuraminidase at 2.9 Angstroms Resolution
Varghese, J.N.,Laver, W.G.,Colman, P.M.
(1983) Nature 303: 35
- The Structure of the Complex between Influenza Virus Neuraminidase and Sialic Acid, the Viral Receptor
Varghese, J.N.,Mckimm-Breschkin, J.L.,Caldwell, J.B.,Kortt, A.A.,Colman, P.M.
(1992) Proteins 14: 327
- Influenza Virus Neuraminidase with Hemagglutinin Activity
Laver, W.G.,Colman, P.M.,Webster, R.G.,Hinshaw, V.S.,Air, G.M.
(1984) Virology 137: 314
- The Three-Dimensional Structure of Neuraminidase of Subtype N9 from an Avian Influenza Virus
Baker, A.T.,Varghese, J.N.,Laver, W.G.,Air, G.M.,Colman, P.M.
(1987) Proteins 1: 111
- Refined Atomic Structures of N9 Subtype Influenza Virus Neuraminidase and Escape Mutants
Tulip, W.R.,Varghese, J.N.,Baker, A.T.,Van Donkelaar, A.,Laver, W.G.,Webster, R.G.,Colman, P.M.
(1991) J.Mol.Biol. 221: 487
- Gene and Protein Sequence of an Influenza Virus Neuraminidase with Hemagglutinin Activity
Air, G.M.,Ritchie, L.R.,Laver, W.G.,Colman, P.M.
(1985) Virology 145: 117
- Three-Dimensional Structure of the Neuraminidase of Influenza Virus A(Slash)Tokyo(Slash)3(Slash)67 at 2.2 Angstroms Resolution
Varghese, J.N.,Colman, P.M.
(1991) J.Mol.Biol. 221: 473
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 in ...
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.
Biomolecular Research Institute, Parkville, Victoria, Australia.