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Restos de un antiguo metabolismo sin fosfato
Joshua E Goldford1, Hyman Hartman2, Temple F Smith3
1Bioinformatics Program, Boston University, Boston, MA 02215, USA.
Cell
|March 7, 2017
Resumen
Un metabolismo libre de fosfato, utilizando compuestos prebióticos simples y tioésteres, puede haber precedido a la bioquímica moderna. Este descubrimiento sugiere un nuevo origen de la vía de la vida, desafiando el papel esencial del fosfato en el metabolismo temprano.
Área de la Ciencia:
- El origen de los estudios biológicos
- Biología de sistemas
- Química prebiótica
Sus antecedentes:
- El fosfato es crucial para la vida, pero su disponibilidad geoquímica en la Tierra temprana es debatida.
- El origen de las vías metabólicas centrales y su dependencia del fosfato sigue sin estar claro.
Objetivo del estudio:
- Para investigar la hipótesis de que el protometabolismo podría surgir antes de la incorporación de fosfato.
- Explorar otras redes metabólicas independientes del fosfato.
Principales métodos:
- Se emplearon enfoques de biología de sistemas.
- Análisis de una red metabólica críptica y independiente del fosfato.
Principales resultados:
- Se identificó un metabolismo del núcleo independiente del fosfato, producible a partir de compuestos prebióticos simples.
- Esta red apoya la biosíntesis de las biomoléculas clave y favorece a los grupos de hierro y azufre.
- Los acoplamientos de tioésteres superan los cuellos de botella termodinámicos con mayor eficacia que los acoplamientos de fosfato.
Conclusiones:
- La red identificada puede representar un fósil metabólico de una bioquímica temprana y libre de fosfatos.
- Esto apoya las propuestas de un metabolismo basado en tioester que es anterior al fosfato y al ARN.
- Sugiere una posible vía alternativa para el origen de la vida.
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