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Dinámica de la columna vertebral de las proteínas a través de la relajación cruzada 13C'-13Calpha en la

Fabien Ferrage¹, Philippe Pelupessy, David Cowburn

¹New York Structural Biology Center, 89 Convent Avenue, New York, New York 10027, USA. ferrage@chimie.ens.fr

Journal of the American Chemical Society

|August 24, 2006

Resumen

Este estudio introduce un nuevo método para medir los movimientos de la columna vertebral de las proteínas utilizando la dinámica del vector C'C(alfa). El análisis de la dinámica de las proteínas revela un movimiento más restringido C'C(alfa) en comparación con el movimiento del vector NH(N).

Área de la Ciencia:

La biofísica es la biofísica.
Biología Estructural Biología estructural.
Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN)

Sus antecedentes:

La dinámica interna de las proteínas se evalúa típicamente utilizando las tasas de relajación (15)N, que sondean el movimiento de los vectores amida-nitrógeno-hidrógeno (NH).
La medición de las tasas de relajación cruzada de los vectores intra-residuos C ((alfa) -C') ofrece información complementaria sobre los movimientos de la columna vertebral.

Objetivo del estudio:

Desarrollar y validar un nuevo enfoque experimental para medir la dinámica del vector C ((alfa) -C') en proteínas.
Para investigar la dinámica interna de la ubiquitina humana utilizando esta nueva técnica.

Principales métodos:

Se desarrolló un nuevo método basado en la observación de la transferencia entre dos órdenes de giro (2N(z) ((() y 2N(z) (().
Este enfoque "ancla" a los operadores al término N (z) (n) del residuo adyacente de amida.
Se empleó la reconversión simétrica para minimizar los artefactos experimentales.

Principales resultados:

El método se aplicó con éxito a la ubiquitina humana a 284,1 K (tiempo de correlación de 7,1 ns).
El análisis reveló que los movimientos del vector C ((alfa) -C') son más restringidos que los del vector NH.

Conclusiones:

El método propuesto proporciona información valiosa sobre la dinámica de la columna vertebral de las proteínas más allá de las mediciones tradicionales de vectores NH.
Los hallazgos sugieren una movilidad diferencial dentro de las estructuras de las proteínas, con vectores C ((alfa) -C') que muestran menos movimiento.

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