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Escisión selectiva de la hebra de ADN con complejos de cobre binucleares: implicaciones para una especie activa de

Sunita Thyagarajan¹, Narasimha N Murthy, Amy A Narducci Sarjeant

¹Department of Chemistry, Johns Hopkins University, Baltimore, MD 21218, USA.

Journal of the American Chemical Society

|May 25, 2006

Resumen

Los complejos binucleares de cobre (II) dividen selectivamente el ADN en sitios específicos. Los complejos de cobre N4 y N5, en presencia de ácido 3-mercaptopropanoico y oxígeno, demuestran una significativa actividad de escisión de la cadena de ADN.

Área de la Ciencia:

Química bioorgánica Química bioorgánica.
Coordinación Química de la Coordinación
Biología Molecular Biología Molecular

Sus antecedentes:

Los complejos binucleares de cobre (II) se investigan por su potencial para catalizar reacciones biológicas.
Comprender los mecanismos de daño y reparación del ADN es crucial en biología molecular y medicina.
La escisión selectiva de la cadena de ADN es un objetivo clave para el desarrollo de nuevos agentes terapéuticos.

Objetivo del estudio:

Para investigar las especies intermedias responsables de la escisión selectiva de la cadena de ADN por complejos binucleares de cobre (II).
Para explorar el papel de las series homólogas de complejos de cobre en la escisión del ADN.
Para dilucidar el mecanismo de reacción que involucra complejos de cobre, ácido 3-mercaptopropanoico y oxígeno.

Principales métodos:

Síntesis y caracterización de una serie homóloga de complejos binucleares de cobre (II).
Ensayos de escisión de cadenas de ADN en presencia de ácido 3-mercaptopropanoico (MPA) y oxígeno, o peróxido de hidrógeno (H2O2).
Estudios espectroscópicos (por ejemplo, UV-Vis, EPR) y estudios de reactividad para identificar intermediarios de reacción.

Principales resultados:

El complejo de cobre N3 no mostró reactividad hacia el ADN.
Los complejos de cobre N4 y N5 exhibieron una actividad de escisión de cadena de ADN comparable, específicamente en las uniones de cadena única / doble.
Se observó una reactividad idéntica cuando se utilizó peróxido de hidrógeno en lugar de MPA/O2.2.
Los estudios espectroscópicos y de reactividad apoyaron la formación de un complejo lateral de peroxodicobre (II) (Cu2-O2) como la especie activa en la oxidación del ADN.

Conclusiones:

La serie homóloga de los complejos binucleares de cobre (II) muestra actividad de escisión selectiva de la cadena de ADN.
Los análogos N4 y N5 son efectivos para la escisión del ADN en uniones estructurales específicas.
Un intermediario lateral de peroxodicobre (II) está implicado en el mecanismo de oxidación del ADN mediado por estos complejos de cobre.

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