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Laboratory Simulation of an IronII-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria
Published on: July 24, 2016
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Quemolitoautotropía bacteriana por medio de la oxidación del manganeso
Hang Yu1, Jared R Leadbetter2,3
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
Nature
|July 17, 2020
Resumen
Los investigadores descubrieron microbios que utilizan la oxidación del manganeso para el crecimiento, completando un ciclo biogeoquímico clave. Este hallazgo amplía nuestra comprensión del metabolismo energético microbiano y la Tierra
Área de la Ciencia:
- Microbiología
- Geoquímica
- Biogeoquímica
Sus antecedentes:
- Se teorizó que la oxidación del manganeso apoyaba el crecimiento microbiano, pero carecía de demostración experimental.
- Los microorganismos quimioautotróficos utilizan compuestos inorgánicos para obtener energía y fijar carbono.
Objetivo del estudio:
- Demostrar y caracterizar el crecimiento microbiano impulsado por la oxidación del manganeso (Mn ((II)).
- Identificar los microorganismos implicados y sus vías metabólicas.
Principales métodos:
- Refinamiento de cultivos de enriquecimiento para aislar un co-cultivo oxidante de Mn (II).
- Proyección de isótopos estables con 13CO2 para rastrear la fijación de carbono.
- Análisis transcriptómico para elucidar las vías metabólicas.
Principales resultados:
- Un co-cultivo de dos bacterias, "Candidatus Manganitrophus noduliformans" y Ramlibacter lithotrophicus, demostró un crecimiento exponencial dependiente de la oxidación del Mn{II}.
- La oxidación de Mn (II) produjo nódulos de óxido de manganeso asociados con las células bacterianas.
- Las sondas de isótopos estables confirmaron la fijación de 13CO2 en la biomasa relacionada con la oxidación de Mn{II}.
Conclusiones:
- Este estudio proporciona la primera evidencia experimental para el crecimiento microbiano impulsado por la oxidación del manganeso.
- Los hallazgos amplían la diversidad conocida de los metabolismos inorgánicos y completan el ciclo biogeoquímico del manganeso.
- Las vías microbianas identificadas vinculan la oxidación extracelular del manganeso con la conservación aeróbica de la energía y la fijación autotrófica de CO2.
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