Structure of a calcium-deficient form of influenza virus neuraminidase: implications for substrate binding
- Author(s)
- Smith, BJ; Huyton, T; Joosten, RP; McKimm-Breschkin, JL; Zhang, JG; Luo, CS; Lou, MZ; Labrou, NE; Garrett, TPJ;
- Journal Title
- ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
- Publication Type
- Journal Article
- Abstract
- The X-ray structure of influenza virus neuraminidase (NA) isolated from whale, subtype N9, has been determined at 2.2 angstrom resolution and contains a tetrameric protein in the asymmetric unit. In structures of NA determined previously, a calcium ion is observed to coordinate amino acids near the substrate-binding site. In three of the NA monomers determined here this calcium is absent, resulting in structural alterations near the substrate-binding site. These changes affect the conformation of residues that participate in several key interactions between the enzyme and substrate and provide at a molecular level the basis of the structural and functional role of calcium in substrate and inhibitor binding. Several sulfate ions were identified in complex with the protein. These are located in the active site, occupying the space reserved for the substrate (sialic acid) carboxylate, and in positions leading away from the substrate-binding site. These sites offer a new opportunity for the design of inhibitors of influenza virus NA.
- Publisher
- BLACKWELL PUBLISHING
- Keywords
- SULFATE MONOHYDRATE; ISOMORPHOUS REPLACEMENT; 3-DIMENSIONAL STRUCTURE; CRYSTAL-STRUCTURE; DRUG DESIGN; SIALIC-ACID; X-RAY; INHIBITORS; COMPLEX; ERRORS
- Publisher's Version
- https://doi.org/10.1107/S907444906020063
- Terms of Use/Rights Notice
- Refer to copyright notice on published article.
Creation Date: 2006-09-01 12:00:00