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Interruptores de moléculas pequeñas para los factores de transcripción del dedo de zinc

Qing Lin¹, Carlos F Barbas, Peter G Schultz

¹Department of Chemistry and The Skaggs Institute for Chemical Biology, 10550 North Torrey Pines Road, The Scripps Research Institute, La Jolla, California 92037, USA.

Journal of the American Chemical Society

|January 16, 2003

Resumen

Los investigadores crearon un método novedoso para diseñar interruptores de moléculas pequeñas para los factores de transcripción del dedo de zinc. Se encontró un compuesto específico (7) para restaurar la función de un factor de transcripción comprometido, lo que demuestra el potencial para la regulación genética dirigida.

Área de la Ciencia:

Biología Molecular Biología Molecular
Biología Química Biología química.
Descubrimiento de Drogas Descubrimiento de Drogas

Sus antecedentes:

Los factores de transcripción del dedo de zinc (ZFTF) son reguladores cruciales de la expresión génica.
El desarrollo de pequeñas moléculas para modular la actividad de ZFTF es un desafío debido a los requisitos de especificidad.
La complementación estructural ofrece una estrategia potencial para el diseño de moduladores ZFTF.

Objetivo del estudio:

Desarrollar un enfoque general para la generación de interruptores selectivos de pequeñas moléculas para ZFTF.
Para identificar moléculas pequeñas que puedan rescatar funcionalmente ZFTFs estructuralmente comprometidos.
Para dilucidar el mecanismo por el cual las pequeñas moléculas modulan la actividad ZFTF.

Principales métodos:

Cribado de una biblioteca de heterociclos para identificar potenciales moduladores de moléculas pequeñas.
Utilizando un ensayo de transactivación basado en luciferasa para medir la actividad de ZFTF.
Empleando la resonancia plasmónica de superficie (SPR) para evaluar la afinidad de unión entre las ZFTF y el ADN.

Principales resultados:

Se identificó una nueva molécula pequeña, el 2-(4'-quinolina) benzimidazol (compuesto 7).
El Compuesto 7 rescató funcionalmente a una ZFTF mutante (C7-F116A/H125G-VP16), aumentando su actividad aproximadamente 18 veces.
El análisis de SPR mostró que el compuesto 7 aumentó la afinidad de unión de la ZFTF mutante a su objetivo de ADN en 16 veces, lo que indica una interacción específica.

Conclusiones:

El enfoque desarrollado permite la generación de interruptores selectivos de moléculas pequeñas para ZFTFs.
El Compuesto 7 actúa como un agente de rescate funcional para un ZFTF comprometido, probablemente a través de la recuperación parcial de afinidad.
Este estudio proporciona una base para el diseño de moléculas pequeñas dirigidas para controlar la expresión génica a través de ZFTFs.

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