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La plasticidad conformacional en los dominios de unión de dsRNA impulsa la divergencia funcional en el reconocimiento

Debadutta Patra^1,2, Jaydeep Paul^1,2, Upasana Rai^1,2

¹CSIR─Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500007, India.

Journal of the American Chemical Society

|May 6, 2025

Resumen

La dinámica estructural de las proteínas, no sólo la secuencia, dicta la función. Este estudio revela cómo la flexibilidad de la proteína en los dominios de unión al dsRNA (dsRBD) impulsa las diferencias funcionales en el reconocimiento del sustrato, impactando los resultados biológicos.

Área de la Ciencia:

La bioquímica
Biología estructural
Biofísica molecular

Sus antecedentes:

La especificidad funcional de las proteínas a menudo está vinculada a la secuencia y la estructura, pasando por alto la dinámica conformacional.
Comprender la dinámica de las proteínas es crucial para descifrar los mecanismos biológicos y las enfermedades.
Los dominios de unión de ARN de doble cadena (dsRBD) son reguladores clave de la biología del ARN.

Objetivo del estudio:

Investigar el papel de la dinámica conformacional en la divergencia funcional de los parálogos del dominio de unión al dsRNA (dsRBD).
Para aclarar los mecanismos de reconocimiento diferencial del sustrato de DRB2D1 y DRB3D1.
Explorar cómo la dinámica intrínseca de las proteínas gobierna la especificidad en las interacciones dsRBD:dsRNA.

Principales métodos:

Utilizó la espectroscopia de RMN 15N-CEST para sondear la dinámica de las proteínas.
Se emplearon simulaciones de dinámica molecular por metainferencia corregidas por RDC.
Enfoques experimentales y computacionales combinados para capturar conjuntos conformacionales.

Principales resultados:

DRB3D1 exhibe plasticidad estructural que permite el reconocimiento de dsRNA flexible, a diferencia del DRB2D1 rígido.
Mecanismos identificados de reconocimiento diferencial de sustrato entre parálogos dsRBD.
Las conformaciones intermedias de proteínas capturadas, proporcionan una imagen más completa más allá de los estados básicos y excitados.

Conclusiones:

La dinámica estructural intrínseca juega un papel fundamental en la conducción de la divergencia funcional entre parálogos de proteínas.
La flexibilidad de las proteínas es un determinante clave de la especificidad en las interacciones dsRBD:dsRNA.
Un enfoque de dinámica a múltiples escalas de tiempo revela mecanismos matizados de reconocimiento molecular.

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