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Descubrimiento rápido de sondas covalentes mediante cribado de fragmentos de electrofilos
Efrat Resnick, Anthony Bradley1,2, Jinrui Gan
1Department of Chemistry , Chemistry Research Laboratory , 12 Mansfield Road , Oxford OX1 3TA , U.K.
Journal of the American Chemical Society
|May 8, 2019
Resumen
Descubrir potentes sondas covalentes es un desafío. Este estudio introduce un nuevo método de cribado de fragmentos electrófilos, que produce sondas selectivas para enzimas no dirigidas anteriormente como OTUB2 y NUDT7.
Área de la Ciencia:
- Biología química
- Descubrimiento de drogas
- Cribado por fragmentos
Sus antecedentes:
- Las sondas covalentes ofrecen una potencia y una duración superiores, pero son difíciles de descubrir.
- Los fragmentos electrófilos, aunque potencialmente poderosos, a menudo carecen de selectividad.
- Los métodos de cribado de fragmentos anteriores están limitados por la baja afinidad de los aglutinantes reversibles.
Objetivo del estudio:
- Desarrollar un método práctico y eficiente para el descubrimiento de ligandos covalentes selectivos.
- Para superar el desafío de selectividad asociado con los fragmentos electrófilos.
- Para identificar nuevas sondas covalentes para objetivos proteicos desafiantes.
Principales métodos:
- Construcción y caracterización de una biblioteca de 993 miembros de fragmentos ligeramente electrófilos.
- Desarrollo de un ensayo de reactividad del tiol de alto rendimiento para la caracterización de fragmentos.
- Evaluación de la biblioteca contra 10 proteínas que contienen cisteína, seguida de una cristalografía de alto rendimiento.
Principales resultados:
- Se demostró que los electrófilos leves son selectivos, y los fragmentos altamente reactivos son raros.
- El enfoque de cribado dio resultados positivos para la mayoría de los objetivos de proteínas analizados.
- Se desarrollaron rápidamente sondas covalentes potentes y selectivas para OTUB2 y NUDT7, enzimas sin inhibidores conocidos previos.
Conclusiones:
- El cribado por fragmentos electrofílicos es una estrategia viable y eficiente para el descubrimiento de ligandos covalentes.
- Los electrófilos leves se pueden emplear con éxito para lograr la selectividad del objetivo.
- Este enfoque permite la identificación rápida de nuevas sondas covalentes para objetivos enzimáticos.
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