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Bases termodinámicas para la promiscuidad y la selectividad en las interacciones proteína-proteína: dominios PDZ, un
Nathalie Basdevant1, Harel Weinstein, Marco Ceruso
1Department of Chemistry, CUNY College of Staten Island, 2800 Victory Boulevard, Staten Island, NY 10314, USA.
Journal of the American Chemical Society
|September 28, 2006
Resumen
Los dominios PDZ median procesos celulares cruciales mediante la unión de péptidos. Las simulaciones de dinámica molecular revelan que las interacciones no polares favorables y la dinámica variable contribuyen a la promiscuidad del dominio PDZ y la selectividad en la unión a las proteínas.
Área de la Ciencia:
- Biología molecular La biología molecular.
- La biofísica es la biofísica.
- Biología computacional Biología computacional.
Sus antecedentes:
- Los dominios PDZ son críticos para el ensamblaje de complejos multiproteicos en los procesos celulares.
- Se unen a motivos peptídicos específicos en las proteínas objetivo, pero también pueden interactuar con diversos ligandos, lo que plantea preguntas sobre los mecanismos subyacentes.
Objetivo del estudio:
- Investigar las bases moleculares y termodinámicas de la promiscuidad y la selectividad del dominio PDZ.
- Identificar las fuentes de variabilidad en las interacciones del dominio PDZ con diferentes ligandos peptídicos.
Principales métodos:
- Se llevaron a cabo simulaciones de dinámica molecular (20-25 ns) en 12 diferentes complejos de dominio PDZ.
- Se evaluaron las contribuciones de entropía electrostática, no polar y de configuración utilizando el análisis MM/PBSA y el análisis cuasi-armónico.
Principales resultados:
- Las interacciones del dominio PDZ están dominadas por contribuciones no polares favorables con una influencia electrostática mínima, lo que potencialmente permite la promiscuidad.
- Se observó una variabilidad significativa en los aspectos de unión entrópica y dinámica en diferentes dominios y ligandos de PDZ, a pesar de las similitudes estructurales.
Conclusiones:
- La interacción de las interacciones no polares y la variabilidad dinámica puede explicar la doble capacidad de los dominios PDZ para la unión promiscuo y selectiva.
- Se sugiere que los factores entrópicos y dinámicos son determinantes clave de la selectividad en las interacciones dominio-ligando de la PDZ.
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