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Platino específico del sitio (II) enlaces cruzados en un sitio activo de la ribozima
Erich G Chapman1, Victoria J DeRose
1Department of Chemistry and Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403, USA.
Journal of the American Chemical Society
|November 11, 2011
Resumen
Los investigadores desarrollaron un nuevo método de enlaces cruzados de ARN-ARN de platino utilizando sustituciones de fosforotioato. Esta técnica permite el análisis estructural del ARN específico del sitio, como se demuestra en la ribozima Hammerhead.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
Sus antecedentes:
- La estructura y la dinámica del ARN son cruciales para la función.
- El enlace cruzado específico del sitio proporciona valiosas restricciones de distancia para la biología estructural del ARN.
- Los métodos existentes requieren un mayor refinamiento para una determinación precisa de la estructura del ARN.
Objetivo del estudio:
- Introducir una nueva estrategia de enlace cruzado ARN-ARN utilizando complejos de platino (II).
- Para investigar la aplicación de este método en la exploración de la estructura de la ribozima Hammerhead.
- Establecer una nueva herramienta para estudios estructurales y dinámicos de ARN específicos del sitio.
Principales métodos:
- Una nueva estrategia de enlaces cruzados ARN-ARN basada en la orientación de las sustituciones de Pt (II) a los fosforotioatos.
- El reclutamiento cinético y el anclaje de los complejos cis-diamina Pt (II) al ARN sustituido por fosforotioato.
- Inducir enlaces cruzados mediados por metales entre las nucleobases de ARN a través de la sustitución compleja Pt(II).
Principales resultados:
- La reticulación Pt (II) se produjo en los nucleótidos G8 y G10 dentro del sitio activo de la ribozima Hammerhead cuando un fosforotioato estaba en el enlace de escisión.
- La eficiencia de enlace cruzado, que alcanzaba hasta un 30% de rendimiento, dependía de la concentración de iones Mg2+ y la formación de la estructura terciaria del ARN.
- Los enlaces cruzados se observaron específicamente dentro del sitio activo, no en las hélices de ARN, lo que indica la especificidad del sitio.
Conclusiones:
- La estrategia de enlace cruzado desarrollada basada en Pt (II) es efectiva para el análisis estructural de ARN específico del sitio.
- Este método proporciona una nueva herramienta prometedora para explorar la estructura y la dinámica del ARN, particularmente en motivos complejos de ARN.
- Los hallazgos destacan el potencial de los complejos Pt (II) cinéticamente inertes en el avance de la biología estructural del ARN.
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