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Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
Published on: October 24, 2016
Maquinaria de transcripción de levadura de ingeniería para mejorar la tolerancia y la producción de etanol
Hal Alper1, Joel Moxley, Elke Nevoigt
1Department of Chemical Engineering, Massachusetts Institute of Technology, Room 56-469, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|December 13, 2006
Resumen
La ingeniería de maquinaria de transcripción global (gTME) mejoró la levadura.
Área de la Ciencia:
- Biotecnología y Biología Sintética.
- La ingeniería microbiana es la ingeniería microbiana.
- Biocombustibles Producción de la producción de los biocombustibles
Sus antecedentes:
- La ingeniería de maquinaria de transcripción global (gTME) es un método para reprogramar la transcripción de genes.
- Los fenotipos celulares son críticos para las aplicaciones tecnológicas, incluida la producción de biocombustibles.
- Mejorar la tolerancia a la glucosa y al etanol en Saccharomyces cerevisiae es clave para una producción eficiente de biocombustibles.
Objetivo del estudio:
- Aplicar gTME a Saccharomyces cerevisiae para mejorar la tolerancia a la glucosa y al etanol.
- Identificar modificaciones genéticas que mejoren la eficiencia de la conversión de glucosa en etanol.
- Demostrar la utilidad de gTME para el desarrollo de fenotipos celulares complejos.
Principales métodos:
- El uso de gTME en Saccharomyces cerevisiae.
- Utilizando la mutagénesis del factor de transcripción Spt15p.
- Implementar estrategias de selección para identificar mutaciones beneficiosas.
Principales resultados:
- Se identificaron mutaciones dominantes en el gen SPT15 que confieren una mayor tolerancia a la glucosa/etanol.
- Se observó una conversión más eficiente de la glucosa en etanol en cepas de levadura modificadas.
- Se caracterizaron tres mutaciones específicas dentro de SPT15 (Phe{177}Ser, Tyr{195}His, Lys{218}Arg) responsables del fenotipo mejorado.
Conclusiones:
- gTME es eficaz para mejorar los rasgos críticos en Saccharomyces cerevisiae para los biocombustibles.
- Las mutaciones identificadas en Spt15p ofrecen una ruta para mejorar la tolerancia de la levadura y la producción de etanol.
- gTME proporciona un nuevo enfoque para lograr fenotipos complejos que no son fácilmente alcanzables a través de métodos tradicionales.
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