Estructura de la solución de RMN de una horquilla de oligonucleótido con un tallo 2'F-ANA / ARN: implicaciones para la especificidad de la RNasa H hacia los dúplex híbridos ADN / ARN
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
J F Trempe1, C J Wilds, A Y Denisov
1Department of Biochemistry and Montreal Joint Center for Structural Biology, McGill University, Montreal, Canada.
Journal of the American Chemical Society
|July 18, 2001
Resumen
La primera estructura de un dúplex de ácido nucleico 2'-deoxy-2'-fluoro-D-arabinosa (2'F-ANA) / ARN revela conformaciones únicas de azúcares, lo que explica una mayor estabilidad y potencial para el diseño de fármacos antisense.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Química Medicinal La Química Medicinal es un campo de estudio de la química medicinal.
Sus antecedentes:
- Las drogas antisense requieren estructuras estables de ácido nucleico para su eficacia.
- Comprender la base estructural de los dúplex modificados de ácido nucleico es crucial para el diseño de fármacos.
- El ácido nucleico 2 eal'-deoxy-2 eal'-fluoro-D-arabinosa (2 eal'F-ANA) es un prometedor ácido nucleico modificado con azúcar.
Objetivo del estudio:
- Para determinar la primera estructura 3D de un dúplex 2 eal'F-ANA/ARN.
- Para caracterizar las propiedades estructurales y dinámicas de la cadena 2 eal'F-ANA dentro de un dúplex híbrido.
- Para aclarar la base estructural para la estabilidad mejorada de 2 eal'F-ANA / ARN dúplex.
Principales métodos:
- Se utilizó la espectroscopia de RMN para la caracterización estructural.
- Se realizaron experimentos de RMN 2D homonucleares y heteronucleares.
- Se obtuvieron asignaciones de resonancia completas y restricciones NOE.
Principales resultados:
- La hebra de ARN adoptó una estructura de forma A con C3 eal' endosugar puckers.
- La hebra 2 eal'F-ANA exhibió O4 eal' endosugar puckers, que difieren de los híbridos ADN/ARN.
- Los parámetros estructurales dúplex eran intermedios entre la forma A y la forma B del ADN.
- La estructura observada explica la estabilidad mejorada de dos duplexos F-ANA/ARN.
Conclusiones:
- La estructura única de 2 eal'F-ANA / ARN dúplex contribuye a su mayor estabilidad.
- Estos hallazgos proporcionan una justificación estructural para el aumento de la estabilidad y la actividad de RNasa H de 2 duplexos F-ANA/ARN.
- Los resultados son significativos para el diseño racional de nuevas terapias antisense que utilizan ácidos nucleicos modificados con azúcar.
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