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Las carboligasas artificiales de ingeniería facilitan la preparación regioselectiva de aductos de aldol enriquecidos

Duncan S Macdonald¹, Xavier Garrabou¹, Cindy Klaus¹

¹Laboratory of Organic Chemistry, ETH Zurich, 8093 Zurich, Switzerland.

Journal of the American Chemical Society

|May 20, 2020

Resumen

Los investigadores diseñaron una aldolasa artificial para aceptar eficientemente varias cetonas para las adiciones de aldol. Este biocatalizador demuestra una alta regioselectividad y estereocontrol, ofreciendo una herramienta versátil para la síntesis química.

Área de la Ciencia:

Biocatálisis
Ingeniería de enzimas
Química orgánica

Sus antecedentes:

El control de la regioselectividad y la estereoselectividad en las adiciones de aldol es un desafío importante en la síntesis orgánica.
Las aldolasas naturales a menudo tienen un alcance de sustrato limitado, lo que restringe su aplicación en transformaciones químicas complejas.

Objetivo del estudio:

Reingeniería de una aldolasa artificial para una aceptación más amplia del sustrato, específicamente para acomodar cetonas alifáticas lineales y cíclicas.
Para lograr una alta eficiencia, regioselectividad y estereocontrol en la actividad de la aldoasa modificada.

Principales métodos:

Mutagénesis dirigida al sitio de un sitio activo de aldolasa artificial.
Ensayos bioquímicos para evaluar la actividad enzimática y el alcance del sustrato.
Cristalografía de rayos X para elucidar los mecanismos estructurales de unión y activación del sustrato.

Principales resultados:

Las mutaciones de un solo sitio activo permitieron que la aldolasa artificial aceptara diversas cetonas alifáticas como donantes de aldol con alta eficiencia.
La enzima modificada exhibió una regioselectividad y un estereocontrol notables en las reacciones de adición de aldol.
Los datos cristalográficos revelaron cómo los residuos mutados influyen en la interacción del sustrato y los resultados catalíticos.

Conclusiones:

La reingeniería de la aldolasa artificial proporciona un biocatalizador versátil para las adiciones de aldol con un mayor alcance de sustrato.
Este enfoque simplifica la personalización de los biocatalizadores en comparación con la modificación de las enzimas naturales.
Estas proteínas de ingeniería sirven como puntos de partida prometedores para el desarrollo de biocatalizadores a medida para aplicaciones prácticas.

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