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La estructura cristalina de la ribonucleasa es el dominio H de la transcriptasa inversa del VIH-1
J F Davies1, Z Hostomska, Z Hostomsky
1Agouron Pharmaceuticals, Inc., La Jolla, CA 92037.
Science (New York, N.Y.)
|April 5, 1991
Resumen
La estructura cristalina del VIH-1 es la transcriptasa inversa.
Área de la Ciencia:
- Biología estructural Biología estructural.
- Virología Virología.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La transcriptasa inversa del VIH-1 (RT) es una enzima crucial para la replicación viral.
- El dominio de la ribonucleasa H (RNasa H) del VIH-1 RT juega un papel en la síntesis del ADN viral.
- Comprender la estructura de la RNasa H es vital para el desarrollo de terapias antivirales.
Objetivo del estudio:
- Para determinar la estructura cristalina del dominio H de la ribonucleasa del VIH-1 RT.
- Para aclarar la base estructural de la actividad y las interacciones de la enzima.
- Proporcionar información sobre el ensamblaje y la función del RT. maduro del VIH-1.
Principales métodos:
- Cristalografía de rayos X con una resolución de 2.4 A.
- Refinamiento de la estructura cristalina a un factor R de 0,20.
- Análisis de las interacciones de plegamiento de proteínas, sitio activo y subunidad.
Principales resultados:
- El dominio de la RNasa H del VIH-1 adopta una hoja beta de cinco hebras y cuatro hélices alfa.
- Dos cationes metálicos divalentes y residuos ácidos conservados forman el sitio activo.
- La estructura es similar a la RNasa H de Escherichia coli, pero con características únicas.
- La unión polimerasa-RNasa H es inaccesible para el disolvente, lo que sugiere la asimetría del precursor.
Conclusiones:
- La estructura determinada proporciona un modelo atómico detallado del dominio H de la RNasa H del VIH-1.
- Las características estructurales explican la actividad reconstituida de dominios aislados.
- Los hallazgos sugieren una estructura asimétrica del precursor p66-p66 de RT.
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