Analysis of inhibitor binding in influenza virus neuraminidase.
2,3-didehydro-2-deoxy-N:-acetylneuraminic acid (DANA) is a transition state analog inhibitor of influenza virus neuraminidase (NA). Replacement of the hydroxyl at the C9 position in DANA and 4-amino-DANA with an amine group, with the intention of taking advantage of an increased electrostatic interaction with a conserved acidic group in the active site to improve inhibitor binding, significantly reduces the inhibitor activity of both compounds. The three-dimensional X-ray structure of the complexes of these ligands and NA was obtained to 1.4 A resolution and showed that both ligands bind isosterically to DANA. Analysis of the geometry of the ammonium at the C4 position indicates that Glu119 may be neutral when these ligands bind. A computational analysis of the binding energies indicates that the substitution is successful in increasing the energy of interaction; however, the gains that are made are not sufficient to overcome the energy that is required to desolvate that part of the ligand that comes in contact with the protein.
Biomolecular Research Institute, Parkville, Victoria 3052, Australia. brian.smith@bioresi.com.au
B J
BJ
Smith
P M
PM
Colman
M
M
Von Itzstein
B
B
Danylec
J N
JN
Varghese
D000998:Antiviral Agents / Q000737:chemistry*; D001665:Binding Sites; D018360:Crystallography, X-Ray / Q000295:instrumentation / Q000379:methods*; D004791:Enzyme Inhibitors / Q000737:chemistry*; D008958:Models, Molecular; D019158:N-Acetylneuraminic Acid / Q000031:analogs & derivatives* / Q000737:chemistry*; D009439:Neuraminidase / Q000037:antagonists & inhibitors*; D009716:Numerical Analysis, Computer-Assisted; D009975:Orthomyxoviridae / Q000201:enzymology*; D012794:Sialic Acids / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D055672:Static Electricity
C430965:4,9-diamino-2-deoxy-2,3-didehydro-N-acetylneuraminic; C430964:9-amino-2-deoxy-2,3-didehydro-N-acetylneuraminic; D000998:Antiviral Agents; D004791:Enzyme Inhibitors; D012794:Sialic Acids; D012997:Solvents; C081427:4-amino-2-deoxy-2,3-didehydro-N-acetylneuraminic acid; C036137:2-deoxy-2,3-dehydro-N-acetylneuraminic acid; D009439:Neuraminidase; D019158:N-Acetylneuraminic Acid