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La topología vincula la estructura secundaria del ARN con la conformación global, la dinámica y la adaptación

Maximillian H Bailor¹, Xiaoyan Sun, Hashim M Al-Hashimi

¹Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI 48109, USA.

Science (New York, N.Y.)

|January 9, 2010

Resumen

Las estructuras secundarias de ARN contienen restricciones topológicas que predicen las orientaciones tridimensionales de la hélice en las uniones de ARN. Los contactos terciarios estabilizan las conformaciones específicas dentro de estos conjuntos permitidos, avanzando la predicción de la estructura del ARN.

Área de la Ciencia:

Biología Estructural Biología estructural.
Biología computacional Biología computacional.
La biofísica es la biofísica.

Sus antecedentes:

Las reglas termodinámicas establecidas vinculan la secuencia de ARN a la estructura secundaria.
La relación entre la estructura secundaria del ARN y la conformación 3D global es poco conocida.
Comprender la conformación global del ARN es crucial para predecir la función.

Objetivo del estudio:

Para investigar el vínculo entre la estructura secundaria del ARN y la conformación global tridimensional.
Para determinar si las estructuras secundarias codifican restricciones predecibles en la orientación de la hélice en las uniones de ARN.
Desarrollar un método computacional para predecir la conformación global del ARN basado en la estructura secundaria.

Principales métodos:

Mapas 3D construidos de las orientaciones de las hélices de forma A en las uniones de ARN del Banco de Datos de Proteínas.
Utilizó el modelado computacional y la espectroscopia de resonancia magnética nuclear (RMN) para la racionalización.
Desarrolló y probó algoritmos para calcular restricciones topológicas a partir de estructuras secundarias.

Principales resultados:

Las estructuras secundarias de ARN de las uniones codifican restricciones topológicas computables.
Estas restricciones predicen con precisión la orientación 3D de las hélices a través de todas las uniones bidireccionales.
La conformación global del ARN parece dictada en gran medida por estas restricciones topológicas codificadas por la estructura secundaria.

Conclusiones:

La estructura secundaria del ARN juega un papel crítico en la definición de la conformación 3D global.
Las restricciones topológicas dentro de las estructuras secundarias son predictores clave de la forma global del ARN.
Los contactos terciarios y las interacciones intermoleculares ajustan y estabilizan los conformadores específicos.

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