1NNC

INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) COMPLEXED WITH 4-GUANIDINO-NEU5AC2EN INHIBITOR

1NNC の概要

• エントリーDOI: 10.2210/pdb1nnc/pdb
• 分子名称: NEURAMINIDASE N9, alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, alpha-D-mannopyranose, ... (7 entities in total)
• 機能のキーワード: neuraminidase, sialidase, hydrolase (o-glucosyl)
• 由来する生物種: Influenza A virus (A/tern/Australia/G70C/1975(H11N9))
• 細胞内の位置: Virion membrane (By similarity): P03472
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 45791.69

構造登録者

Varghese, J.N.,Colman, P.M. (登録日: 1995-03-15, 公開日: 1996-04-03, 最終更新日: 2024-10-16)

主引用文献

Varghese, J.N.,Epa, V.C.,Colman, P.M.
Three-dimensional structure of the complex of 4-guanidino-Neu5Ac2en and influenza virus neuraminidase.
Protein Sci., 4:1081-1087, 1995

PubMed Abstract: 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.

PubMed: 7549872

実験手法

X-RAY DIFFRACTION (1.8 Å)