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La estabilidad hidrolítica de las biomoléculas a altas temperaturas y su implicación para la vida a 250 grados C
Nature
|August 2, 1984
Resumen
La vida a temperaturas extremas está limitada por la estabilidad de las biomoléculas. Las investigaciones muestran que las moléculas críticas como las proteínas y los ácidos nucleicos se descomponen demasiado rápidamente para que la vida exista a 250 °C en un ambiente acuoso.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Astrobiología Astrobiología.
- Biología extremófila Biología extremófila.
Sus antecedentes:
- El límite superior de temperatura para la vida está dictado por la estabilidad de las biomoléculas esenciales.
- Los enlaces clave en las proteínas, el ARN, el ADN y los nucleótidos son susceptibles a la hidrólisis.
- Las vías de descomposición no hidrolíticas también limitan la integridad de las biomoléculas a altas temperaturas.
Objetivo del estudio:
- Para determinar la estabilidad de las biomoléculas críticas a temperaturas extremas.
- Para evaluar la posibilidad teórica de vida en ambientes de alta temperatura como fuentes hidrotermales de aguas profundas.
Principales métodos:
- Análisis de las tasas hidrolíticas y de descomposición de las biomoléculas esenciales.
- Modelado de la estabilidad de proteínas y ácidos nucleicos a temperaturas de hasta 250°C.
Principales resultados:
- Las tasas de hidrólisis y descomposición de proteínas y ácidos nucleicos son extremadamente altas a 250°C.
- Estas tasas de descomposición sugieren que las biomoléculas no permanecerían intactas en un ambiente acuoso a esta temperatura.
Conclusiones:
- La vida tal como la conocemos, basada en proteínas y ácidos nucleicos, es poco probable que sobreviva a 250°C en un ambiente acuoso.
- La existencia de bacterias "fumadoras negras" de aguas profundas que crecen a 250 °C desafía la comprensión actual de los límites de estabilidad de las biomoléculas.
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