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¿La adsorción en las superficies de la hidroxiapatita induce el plegamiento del péptido? Perspectivas de los cálculos

Albert Rimola¹, Massimiliano Aschi, Roberto Orlando

¹Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.

Journal of the American Chemical Society

|June 12, 2012

Resumen

La adsorción del péptido en las superficies de la hidroxiapatita influye en el plegamiento del péptido. Las mutaciones específicas alteran las preferencias, con P2 favoreciendo la formación de hélices al unirse, a diferencia de P1 que prefiere bobinas aleatorias.

Área de la Ciencia:

Química computacional es la química computacional.
Ciencia de los materiales ciencia de los materiales.
La biofísica es la biofísica.

Sus antecedentes:

La adsorción de péptidos en biomateriales como la hidroxiapatita (HA) es crucial para comprender la integración entre biomaterial y tejido.
La estabilidad conformacional de los péptidos influye en su función biológica e interacción con las superficies.

Objetivo del estudio:

Para investigar el efecto de la adsorción superficial de la hidroxiapatita (HA) en el plegamiento de los péptidos diseñados.
Para aclarar el papel de las mutaciones específicas de aminoácidos y las interacciones superficiales en la estabilización de las conformaciones de péptidos.

Principales métodos:

Cálculos mecánicos cuánticos periódicos a gran escala utilizando el funcional B3LYP.
Simulación de la adsorción de péptidos en superficies secas y húmedas HA (001) y (010).
Análisis de las energías de interacción, incluidas las fuerzas electrostáticas y de dispersión, y transferencia de carga.

Principales resultados:

En la fase gaseosa, ambos péptidos (P1 y P2) adoptan una conformación de bobina aleatoria (RC), con la hélice (H) siendo menos estable.
La adsorción en las superficies de HA implica interacciones a través de C = O, grupos NH2 y fuerzas de dispersión.
El péptido P1 prefiere la adsorción en la conformación RC, mientras que P2 favorece la conformación H en la superficie HA.
La adsorción de hélice de ambos péptidos induce la transferencia de protones y la transferencia significativa de carga a la superficie de HA.

Conclusiones:

La adsorción superficial tiene un impacto significativo en el plegamiento de los péptidos, estabilizando las conformaciones específicas.
Las mutaciones de aminoácidos (por ejemplo, P2 con dos mutaciones) pueden dirigir la preferencia de plegamiento de péptidos durante la adsorción.
La transferencia de protones y cargas durante la adsorción de hélice resalta las complejas interacciones péptido-superficie.

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