Mapping the active site of factor Xa by selective inhibitors: an NMR and MD study.
Proteins
; 30(3): 264-74, 1998 Feb 15.
Article
en En
| MEDLINE
| ID: mdl-9517542
The structure of two selective inhibitors, Ac-Tyr-Ile-Arg-Ile-Pro-NH2 and Ac-(4-Amino-Phe)-(Cyclohexyl-Gly)-Arg-NH2, in the active site of the blood clotting enzyme factor Xa was determined by using transferred nuclear Overhauser effect nuclear magnetic resonance (NMR) spectroscopy. They represent a family of peptidic inhibitors obtained by the screening of a vast combinatorial library. Each structure was first calculated by using standard computational procedures (distance geometry, simulated annealing, energy minimization) and then further refined by systematic search of the conformation of the inhibitor docked in the active site and repeating the simulated annealing and energy minimization. The final structure was optimized by molecular dynamics simulations of the inhibitor-complex in water. The NMR restraints were kept throughout the refinement. The inhibitors assume a compact, very well defined conformation, embedded into the substrate binding site not in the same way as a substrate, blocking thus the catalysis. The model allows to explain the mode of action, affinity, and specificity of the peptides and to map the active site.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Factor Xa
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
Proteins
Asunto de la revista:
BIOQUIMICA
Año:
1998
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Estados Unidos