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Estructuras tridimensionales de proteínas de membrana de la secuenciación genómica.
Thomas A Hopf1, Lucy J Colwell, Robert Sheridan
1Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA.
Cell
|May 15, 2012
Resumen
La covariación de aminoácidos a partir de datos evolutivos ahora puede predecir las estructuras de proteínas transmembrana. Este método modela con precisión las proteínas complejas, revelando su función y dinámica solo a partir de la secuencia.
Área de la Ciencia:
- La biofísica es la biofísica.
- Biología computacional Biología computacional.
- Biología Estructural Biología estructural.
Sus antecedentes:
- Las proteínas transmembranares son cruciales para las funciones celulares, pero son difíciles de caracterizar estructuralmente.
- Predecir sus estructuras 3D solo a partir de la secuencia es un desafío significativo en la biología estructural.
Objetivo del estudio:
- Desarrollar y validar un nuevo método computacional para predecir las estructuras de proteínas transmembrana.
- Demostrar la utilidad de la información evolutiva para la predicción de la estructura de novo.
Principales métodos:
- Utilizando la covarianza de aminoácidos inferida de los registros de secuencias evolutivas.
- Aplicación de un enfoque de entropía máxima para identificar las restricciones de distancia en pares.
- Generar modelos de todos los átomos utilizando estas restricciones (EVfold_membrane).
Principales resultados:
- Predijo con éxito estructuras 3D para 11 proteínas transmembrana desconocidas anteriormente (hasta 14 hélices).
- Se logró una precisión sin precedentes en la predicción ciega de la estructura de novo para 23 familias de proteínas transmembrana.
- Demostró la capacidad del método para predecir la oligomerización de proteínas, los sitios funcionales y los cambios conformacionales.
Conclusiones:
- Los datos de la secuencia evolutiva proporcionan poderosas restricciones para la predicción de la estructura de las proteínas transmembrana.
- EVfold_membrane avanza significativamente las capacidades para modelar diversas y complejas proteínas transmembrana.
- Este enfoque es prometedor para expandir el modelado estructural a una gama más amplia de proteínas.
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