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Elevar el contenido de vitamina E de las plantas a través de la ingeniería metabólica
1Department of Biochemistry, Mail Stop 200, University of Nevada, Reno, NV 89557, USA.
Science (New York, N.Y.)
|December 16, 1998
Resumen
Los investigadores clonaron la metiltransferasa gamma-tocoferol, mejorando la síntesis de alfa-tocoferol (vitamina E) en las plantas. Esto podría aumentar los niveles de vitamina E en la dieta al aumentar el alfa-tocoferol en los aceites agrícolas.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Ciencias de las plantas Ciencias de las plantas.
- Ciencias de la Nutrición Ciencias de la Nutrición
Sus antecedentes:
- El alfa-tocoferol (vitamina E) es un antioxidante liposoluble vital que es esencial para la salud humana.
- Los aceites vegetales, una fuente dietética primaria, son ricos en gamma-tocoferol, un precursor del alfa-tocoferol.
- Las ingestas dietéticas actuales de vitamina E a menudo están por debajo de los niveles recomendados, vinculados al aumento de las enfermedades degenerativas.
Objetivo del estudio:
- Identificar y clonar la enzima responsable del paso final en la biosíntesis de alfa-tocoferol.
- Investigar la posibilidad de aumentar el contenido de alfa-tocoferol en los aceites vegetales.
Principales métodos:
- Utilizó un enfoque basado en la genómica para aislar el gen gamma-tocoferol metiltransferasa.
- Empleó técnicas de sobreexpresión génica en semillas de *Arabidopsis* para modificar la composición de tocoferol.
Principales resultados:
- Se clonó con éxito la enzima gamma-tocoferol metiltransferasa.
- La sobreexpresión de la enzima en las semillas de *Arabidopsis* aumentó significativamente la proporción de alfa-tocoferol en los aceites de semillas.
- Demostró un cambio en la composición del aceite que favorece al alfa-tocoferol sobre su precursor.
Conclusiones:
- La metiltransferasa gamma-tocoferol es la enzima clave para la síntesis de alfa-tocoferol en las plantas.
- La modificación genética de esta enzima ofrece una estrategia viable para mejorar los niveles de vitamina E en los cultivos.
- Aumentar el alfa-tocoferol en los aceites agrícolas puede mejorar la ingesta dietética de vitamina E para mejorar la salud humana.
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