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Ingeniería guiada por quimioinformática de las poliquetasas

Amin Zargar1,2,3, Ravi Lal1,2, Luis Valencia1,2

  • 1Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, California 94608, United States.

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|May 16, 2020
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Resumen

La quimioinformática ayuda a la ingeniería de la policetida sintasa (PKS) al guiar los intercambios de bucles reductores (RL). Esta estrategia produjo con éxito altos títulos de ácidos grasos de cadena corta y lactonas tricétidas, lo que permitió la creación de nuevos productos químicos.

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Área de la Ciencia:

  • Biotecnología
  • Biología sintética
  • Ingeniería Química

Sus antecedentes:

  • Las poliquetidas sintasas (PKS) son cruciales para producir diversas moléculas.
  • Los módulos PKS de ingeniería, en particular para la producción de carbono β saturado a través del intercambio de bucle reductor (RL), presentan un desafío significativo.
  • La quimioinformática, normalmente utilizada en el descubrimiento de fármacos, no se ha aplicado ampliamente a la ingeniería de PKS.

Objetivo del estudio:

  • Establecer la quimioinformática como una estrategia viable para los intercambios de bucles reductores de PKS.
  • Demostrar la utilidad del intercambio de RL para la generación de nuevos productos químicos.
  • Para correlacionar la similitud de la estructura química con los rendimientos de producción en los sistemas PKS de ingeniería.

Principales métodos:

  • Se introdujeron diversas RL de donantes en el primer módulo de extensión de la PKS de lipomicina (LipPKS1).
  • Se expandió el método a la comunicación bimodular mediante la introducción de RL en LipPKS2 para la producción de lactona triketida.
  • Utilizó el análisis de quimiosimilaridad de pares de átomos para predecir y correlacionar con la formación de productos.

Principales resultados:

  • Los PKS unimodulares diseñados lograron títulos de producto correlacionados con la similitud del sustrato RL con LipPKS1.
  • Se ha alcanzado un título de 165 mg/L de ácidos grasos de cadena corta utilizando Streptomyces albus J1074.
  • Se observó una correlación estadísticamente significativa entre la quimiosimilaridad de pares de átomos y el rendimiento del producto tanto en la ingeniería unimodular como en la bimodular de PKS.

Conclusiones:

  • La quimioinformática proporciona un método poderoso y predictivo para la ingeniería de intercambios de bucle reductor de PKS (RL).
  • Este enfoque facilita la producción de productos deseados y no naturales de policetida.
  • El método de quimioinformática establecido puede guiar el diseño racional de PKS para la síntesis química novedosa.