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Mecanismo dinámico para la autofosforilación de la histidina quinasa CheA: simulaciones de dinámica molecular
Jian Zhang1, Yechun Xu, Jianhua Shen
1Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Graduate School, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China.
Journal of the American Chemical Society
|August 18, 2005
Resumen
El estudio revela cómo el ATP actúa como donante de fosforilo y activador en los sistemas de dos componentes bacterianos (TCS). La unión de ATP causa un cambio conformacional en el dominio P4, abriendo la tapa para la unión P1 y la posterior autofosforilación.
Área de la Ciencia:
- Microbiología Microbiología.
- La bioquímica es la bioquímica.
- Biología computacional Biología computacional.
Sus antecedentes:
- Los sistemas de dos componentes (TCS) son cruciales para la transducción de señales bacterianas.
- Las quinasas de histidina median la señalización a través de la autofosforilación entre los dominios P1 y P4.
Objetivo del estudio:
- Para investigar el mecanismo de autofosforilación de las quinasas de histidina TCS utilizando la proteína de quimiotaxis CheA como modelo.
- Para aclarar el papel del ATP en el proceso de fosforilación del CheA.
Principales métodos:
- Enfoque computacional que integra el modelado de la homología, acoplamiento ligando-proteína, acoplamiento proteína-proteína.
- Cuatro simulaciones de dinámica molecular (DM) a escala de nanosegundos de los complejos CheA.
Principales resultados:
- La unión de ATP induce un cambio conformacional en el dominio P4, abriendo la tapa de ATP.
- Esta abertura facilita el estrecho enlace del dominio P1.
- El ATP actúa como un donante de fósforo y un activador para la autofosforilación de CheA.
Conclusiones:
- Se propone un nuevo mecanismo para la autofosforilación de CheA, que implica cambios conformacionales inducidos por ATP.
- El doble papel del ATP como donante y activador es crítico para la señalización TCS en las bacterias.
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