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Síntesis y descomposición de los precursores metabólicos universales promovidos por el hierro
Kamila B Muchowska1, Sreejith J Varma1, Joseph Moran2
1Université de Strasbourg, CNRS, ISIS, Strasbourg, France.
Nature
|May 3, 2019
Resumen
Este estudio revela una red de reacción química que imita el metabolismo biológico central usando moléculas simples y hierro. Sugiere un potencial origen prebiótico para las vías metabólicas esenciales como el ciclo de Krebs.
Área de la Ciencia:
- La bioquímica
- Astrobiología
- El origen de la vida
Sus antecedentes:
- La vida utiliza un conjunto básico de cinco precursores metabólicos universales derivados del dióxido de carbono (CO2).
- Los orígenes evolutivos y las elecciones específicas de los intermediarios bioquímicos, las reacciones y las vías siguen siendo en gran medida inexplicables.
Objetivo del estudio:
- Investigar una red de reacción puramente química que podría servir como un precursor prebiótico para el metabolismo biológico.
- Para explorar la abiogénesis potencial de los ciclos metabólicos clave.
Principales métodos:
- Se utiliza el piruvato acuoso y el glioxilato como materias primas, promovido por el hierro ferroso.
- Se introdujo hidroxilamina y hierro metálico para observar la formación de aminoácidos.
- Analizó la red química para la superposición con los ciclos biológicos de Krebs y glyoxylate.
Principales resultados:
- La red promovida por el hierro sintetizó 9 de los 11 intermediarios del ciclo de Krebs, incluidos los 5 precursores metabólicos universales.
- El sistema exhibió síntesis y descomposición simultáneas de productos intermedios, parecidos al anabolismo y catabolismo biológicos.
- Se observó la formación de cuatro aminoácidos biológicos, en paralelo con las vías de biosíntesis.
Conclusiones:
- La red química descrita representa un sistema prebiótico plausible que podría haber dado lugar a las vías metabólicas biológicas centrales.
- Este hallazgo proporciona información sobre los posibles orígenes químicos de los ciclos de Krebs y glyoxylate.
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