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La proteína del rotavirus involucrada en la replicación y envasado del genoma exhibe un pliegue similar al HIT
Hariharan Jayaram1, Zenobia Taraporewala, John T Patton
1Program in Structural and Computational Biology and Molecular Biophysics, Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA.
Nature
|May 17, 2002
Resumen
La proteína no estructural del rotavirus NSP2 es
Área de la Ciencia:
- Virología Virología.
- Biología Estructural Biología estructural.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El rotavirus causa gastroenteritis infantil severa. el rotavirus también causa gastroenteritis infantil severa.
- La estructura de la proteína no estructural del rotavirus NSP2, crucial para la replicación, sigue siendo en gran medida desconocida.
- NSP2 posee actividades de nucleósido trifosfatasa, de unión al ARN y de desestabilización de hélices.
Objetivo del estudio:
- Para determinar la estructura de rayos X del rotavirus NSP2 octámero.
- Para aclarar la base estructural de las funciones de NSP2 en la replicación del genoma y el empaque.
Principales métodos:
- Cristalografía de rayos X con rayos X.
- Determinación de la estructura de las proteínas a una resolución de 2.6 A.
Principales resultados:
- Se determinó la estructura octamérica funcional de NSP2.
- El monómero NSP2 presenta un nuevo dominio N-terminal y un dominio C-terminal similar a HIT.
- El octámero presenta ranuras potencialmente involucradas en la unión al ARN y la desestabilización de la hélice.
Conclusiones:
- La estructura revela un sitio de unión de nucleótidos dentro de la hendidura de los dominios del monómero.
- La estructura cuaternaria del octámero probablemente facilita múltiples sitios de unión al ARN para las funciones de NSP2.
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