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Ingeniería Corynebacterium glutamicum para la producción de 1,5-pentanediamina a través de una mayor tolerancia al
Longfei Song1, Landong Zhang2, Jia Liu1
1School of Biotechnology and Key Laboratory of Industrial Biotechnology of Ministry of Education, Jiangnan University, Wuxi 214122, China.
Bioresource technology
|February 11, 2026
Resumen
Este estudio diseñó Corynebacterium glutamicum para superar la citotoxicidad de la 1,5-Pentanediamina (PDA) para mejorar la producción microbiana. La estrategia de doble tolerancia mejoró la producción de PDA de glucosa a 130 g/L.
Área de la Ciencia:
- Biotecnología La biotecnología es la biotecnología.
- Ingeniería Metabólica Ingeniería Metabólica.
- Biología sintética Biología sintética.
Sus antecedentes:
- La 1,5-pentanediamina (PDA) es un monómero crucial para varias industrias, pero su producción microbiana está limitada por la citotoxicidad debido a la rápida acumulación intracelular.
- El alto estrés intracelular y extracelular restringe la fermentación eficiente de la PDA.
Objetivo del estudio:
- Desarrollar una cepa microbiana robusta para la producción de alto nivel de 1,5-Pentanediamina (PDA).
- Diseñar Corynebacterium glutamicum para una mayor tolerancia a la toxicidad PDA tanto intracelular como extracelular.
Principales métodos:
- Implementó una estrategia de ingeniería de doble tolerancia en Corynebacterium glutamicum.
- Se identificaron objetivos de tolerancia asociados a la membrana y se utilizó la evolución adaptativa de laboratorio (ALE) para descubrir el determinante cgl1283 para la tolerancia extracelular.
- Diseñado un transportador de eflujo de CgmA de alta actividad mutante para reducir la acumulación de PDA intracelular.
Principales resultados:
- Se logró una mejora significativa en la tolerancia a la PDA extracelular a través de ALE e identificación de cgl1283.
- Reducción de los niveles intracelulares de PDA mediante la ingeniería del transportador de eflujo de CgmA.
- Se optimizó el proceso en un biorreactor de 5 litros, obteniendo 130 g/L de PDA a partir de glucosa con un rendimiento de 0,40 g/g y una productividad de 3,94 g/L/h.
Conclusiones:
- Estableció un marco integral para la producción microbiana de productos químicos tóxicos mediante la integración de la ingeniería de tolerancia intracelular y extracelular.
- Demostró una estrategia efectiva para superar la citotoxicidad en la producción de productos químicos de alto valor como el PDA.
- La cepa de ingeniería LF6.1 es prometedora para la síntesis microbiana a escala industrial de 1,5-Pentanediamina.
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