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Mecanismo de la intercalación de hilos de ADN de complejos Ru binucleares: vías uni- o bimoleculares dependiendo de
1Department of Chemistry and Bioscience, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.
Journal of the American Chemical Society
|July 7, 2005
Resumen
Los complejos de rutenio binucleares semirrígidos exhiben una cinética lenta de unión al ADN. La estructura de ligando auxiliar influye en los mecanismos de roscado del ADN, mostrando potencial para aplicaciones de ADN dirigidas.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química biofísica y bioquímica.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los compuestos de metales de transición interactúan con el ADN, con complejos de rutenio binucleares semirrígidos que muestran una cinética de unión lenta.
- La intercalación de hilos de centros metálicos voluminosos a través de pilas de bases de ADN permite la discriminación estructural.
Objetivo del estudio:
- Para investigar la cinética y los mecanismos de unión al ADN de dos análogos estructurales: Lambda,Lambda-[mu-(11,11'-bidppz) X4Ru2]4+ con X = 2,2'-bipyridine (Lambda,Lambda-B4) y X = 1,10'-phenanthroline (Lambda,Lambda-P4). para investigar la cinética y los mecanismos de unión al ADN de dos análogos estructurales: Lambda,Lambda-[mu-(11,11'-bidppz) X4Ru2]4+ con X = 2,2'-bipyridine (Lambda,Lambda-B4) y X = 1,10'-phenanthroline (Lambda,Lambda-P4).
- Para analizar cómo las estructuras de ligandos auxiliares afectan el mecanismo de roscado del ADN de estos complejos de rutenio.
Principales métodos:
- Medidas cinéticas en diferentes relaciones par de bases/complejo.
- Aplicación del método probabilístico de McGhee y von Hippel para el análisis de mecanismos.
- Ajuste global e integración numérica de las leyes de tasas.
Principales resultados:
- Lambda,Lambda-B4 intercala a través de un mecanismo de pseudo primer orden, independiente de la densidad de enlace.
- Lambda,Lambda-P4 muestra una transición de cinética de primer orden a cinética de segundo orden con una disminución de la relación pares de bases/complejo.
- El mecanismo de primer orden para Lambda, Lambda-P4 requiere un tramo significativo de ADN sin hilo.
Conclusiones:
- La estructura de ligando auxiliar juega un papel crucial en la determinación del mecanismo de roscado del ADN de los complejos de rutenio binucleares.
- Estos complejos demuestran potencial para aplicaciones en la secuencia de ADN y el reconocimiento de conformación.
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