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Conocimiento de la interacción catión-π en el sitio de unión metálica del metallocaperón de cobre CusFF

Dhruva K Chakravorty¹, Bing Wang, Melek N Ucisik

¹Department of Chemistry and Quantum Theory Project, University of Florida, 2238 New Physics Building, P.O. Box 118435, Gainesville, Florida 32611-8435, USA.

Journal of the American Chemical Society

|October 28, 2011

Resumen

La proteína CusF utiliza una interacción cation-π única que involucra a Trp44 para unir iones de cobre y plata. Esta interacción es crucial para proteger los iones de cobre y facilitar su transferencia a otras proteínas.

Área de la Ciencia:

La bioquímica es la bioquímica.
Química computacional es la química computacional.
Biología Estructural Biología estructural.

Sus antecedentes:

La proteína CusF es una chaperona periplásmica involucrada en el transporte de iones de cobre y plata.
Posee un sitio de unión metálico único que presenta una interacción catión-π.

Objetivo del estudio:

Investigar la naturaleza y la fuerza de la interacción catión-π del cobre (I) /plata (I) -Trp44 en CusF.
Comprender el papel de esta interacción en la unión, protección y transferencia de iones metálicos.

Principales métodos:

Cálculos de mecánica cuántica (QM) para evaluar la fuerza de interacción y el orden de enlace.
Cálculos de mecánica cuántica / mecánica molecular (QM / MM) para el análisis del entorno de coordinación.
Simulaciones de dinámica molecular (DM) para estudiar la dinámica de las proteínas y la protección de iones metálicos.

Principales resultados:

Las interacciones de Cu(+) y Ag(+) con Trp44 exhiben una fuerza similar (~14 kcal/mol) y un orden de enlace similar.
El mutante Trp44Met, que carece de la interacción catión-π, muestra un entorno de enlace Cu.(+) distorsionado.
La interacción Cu(+) -Trp44 protege a Cu(+) de la oxidación del agua e influye en la dinámica de las proteínas relacionadas con la unión a CusB.

Conclusiones:

La interacción catión-π es esencial para estabilizar Cu(+) y Ag(+) dentro de CusF.
Esta interacción juega un papel crítico en la prevención de la oxidación de iones metálicos y la facilitación de la transferencia a CusB.
CusF está preorganizado para la unión de metales, siendo la orientación de Trp44 energéticamente favorable.

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