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La recolección de lisina es una estrategia antioxidante y desencadena el metabolismo subterráneo de la poliamina
Viridiana Olin-Sandoval1,2, Jason Shu Lim Yu3, Leonor Miller-Fleming1,4
1Department of Biochemistry, University of Cambridge, Cambridge, UK.
Nature
|August 2, 2019
Resumen
Las células de la levadura se adaptan al estrés oxidativo alterando el metabolismo. Absorben lisina, que alimenta la producción de poliamina, aumentando el glutatión y mejorando la tolerancia al oxidante.
Área de la Ciencia:
- Biología celular
- La bioquímica
- Microbiología
Sus antecedentes:
- Los organismos dependen de los mecanismos anti-estrés para los cambios ambientales.
- Los cambios metabólicos, como la glucólisis a la vía del fosfato de pentosa, son respuestas clave al estrés.
- La función del transportador de poliaminas de levadura Tpo1p en la resistencia a los oxidantes no estaba clara.
Objetivo del estudio:
- Investigar las adaptaciones metabólicas para la resistencia al estrés microbiano.
- Explorar el vínculo entre el metabolismo de la poliamina y la lisina bajo estrés.
- Comprender cómo la absorción de nutrientes influye en la protección contra el estrés.
Principales métodos:
- Experimentos proteómicos en el tiempo para identificar vínculos metabólicos.
- Análisis de las reacciones enzimáticas en las que intervienen enzimas de la vía poliamina.
- Medición de la absorción de nutrientes, el metabolismo redox y los niveles de especies reactivas de oxígeno.
Principales resultados:
- La enzima Spe1p de la levadura descarboxila promiscuamente la lisina para formar la cadaverina.
- La absorción extracelular de lisina aumenta significativamente bajo estrés, dependiendo de la vía de la poliamina.
- Esto desencadena la reprogramación metabólica, canalizando el NADPH al metabolismo del glutatión.
- El aumento de los niveles de glutatión conduce a una reducción de las especies reactivas de oxígeno y a una mayor tolerancia a los oxidantes.
Conclusiones:
- La absorción de nutrientes sirve no solo para el crecimiento sino también para la reconfiguración metabólica durante condiciones favorables.
- Un nuevo vínculo entre el metabolismo de la poliamina y la lisina proporciona un mecanismo preventivo de protección contra el estrés.
- Esta adaptación metabólica mejora la supervivencia microbiana contra los ataques oxidativos.
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