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Dependencia de la temperatura de las interacciones hidrofóbicas de tres cuerpos: potencial de fuerza media, entalpía,
Maria Sabaye Moghaddam1, Seishi Shimizu, Hue Sun Chan
1Protein Engineering Network of Centres of Excellence, Department of Biochemistry, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
Journal of the American Chemical Society
|January 6, 2005
Resumen
Las interacciones hidrofóbicas del tres-metano en el agua dependen de la temperatura. Estas interacciones son anti-cooperativas a bajas temperaturas, pero se vuelven aditivas o cooperativas a temperaturas más altas, lo que afecta el plegamiento de las proteínas.
Área de la Ciencia:
- Química Física es la química física.
- Química computacional es la química computacional.
- La biofísica es la biofísica.
Sus antecedentes:
- Las interacciones hidrofóbicas son cruciales para la asociación molecular en entornos acuosos.
- Comprender los efectos hidrofóbicos de múltiples cuerpos es esencial para modelar sistemas complejos como el plegamiento de las proteínas.
Objetivo del estudio:
- Para investigar las interacciones hidrofóbicas de tres cuerpos dependientes de la temperatura.
- Para analizar la naturaleza cooperativa o anti-cooperativa de estas interacciones.
- Para determinar las propiedades termodinámicas, incluida la capacidad térmica, asociadas con la asociación hidrofóbica de tres cuerpos.
Principales métodos:
- Simulaciones extensas de presión constante utilizando el modelo de agua TIP4P.
- Análisis de disueltos no polares similares al metano a seis temperaturas diferentes.
- Cálculo del potencial de la fuerza media (PMF) para las interacciones de pares y tres cuerpos.
Principales resultados:
- Las interacciones hidrofóbicas de tres metano son anti-cooperativas en la barrera de desolvación a temperaturas bajas a intermedias.
- Las interacciones pasan a ser aditivas o ligeramente cooperativas a altas temperaturas.
- Se observó un cambio positivo significativo en la capacidad térmica después de la asociación de tres metano, contrariamente a las expectativas comunes.
Conclusiones:
- La firma de la capacidad térmica de la asociación hidrofóbica no siempre es negativa y puede ser positiva.
- Estos hallazgos tienen implicaciones para la comprensión de los cambios conformacionales del polímero y la dinámica de plegamiento de las proteínas.
- La dependencia de la temperatura de las interacciones hidrofóbicas multicuerpo juega un papel crítico en el autoensamblaje molecular.
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