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Movimientos cooperativos de proteínas y moléculas de agua de hidratación: estudio de dinámica molecular de la
Noriaki Okimoto1, Takashi Nakamura, Atsushi Suenaga
1Contribution from the Computational Astrophysics Laboratory, Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. okimoto@gsc.riken.go.jp
Journal of the American Chemical Society
|October 8, 2004
Resumen
Las simulaciones de dinámica molecular revelan cómo cambia la estructura de la escitalona deshidratasa (SD) con y sin un ligando. La SD no ligada fluctúa, abriendo su bolsillo de unión para el agua, facilitando la entrada del ligando.
Área de la Ciencia:
- Bioquímica y Biología Molecular.
- La biofísica computacional es una biofísica computacional.
Sus antecedentes:
- La escitalona deshidratasa (SD) es una enzima con un bolsillo único de unión de ligandos.
- La región C-terminal de SD típicamente cubre su sitio activo.
Objetivo del estudio:
- Para investigar las diferencias dinámicas entre la escitalona deshidratasa ligada y no ligada.
- Para aclarar el papel de la dinámica de las proteínas y la hidratación en la unión de ligandos.
Principales métodos:
- Se realizaron dos simulaciones de dinámica molecular (DM) del monómero escitalona deshidratasa.
- Tiempo de simulación total de 25 nanosegundos.
- Se analizó la dinámica de las proteínas y los cambios conformacionales.
Principales resultados:
- La SD ligada mantuvo su estructura inicial, sujetando firmemente el ligando.
- El SD no ligado exhibió importantes fluctuaciones dinámicas y cambios estructurales.
- La región C-terminal del SD no ligado se abrió, permitiendo la solvación del bolsillo de unión.
- Los movimientos cooperativos entre las proteínas no ligadas y las moléculas de agua facilitaron el acceso de los ligandos.
Conclusiones:
- La dinámica de las proteínas y la hidratación son cruciales para la función de la escitalona deshidratasa.
- La apertura de la región C-terminal en SD sin ligandos es clave para la unión de ligandos.
- Las simulaciones de MD proporcionan información sobre las interacciones enzima-ligando y la flexibilidad conformacional.
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