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Growing Magnetotactic Bacteria of the Genus Magnetospirillum: Strains MSR-1, AMB-1 and MS-1
Published on: October 17, 2018
Una bacteria magnetotactica cultivada que produce greigita en un nuevo grupo de bacterias reductoras de sulfatos
Christopher T Lefèvre1, Nicolas Menguy, Fernanda Abreu
1Laboratoire de Bioénergétique Cellulaire, UMR 6191, Commissariat à l'Énergie Atomique Cadarache, Direction des Sciences du Vivant, Institut de Biologie Environnementale et Biotechnologie, Saint-Paul-lez-Durance, France.
Science (New York, N.Y.)
|December 24, 2011
Resumen
Los investigadores descubrieron una nueva bacteria reductora de sulfatos, la cepa BW-1, capaz de producir cristales magnéticos como la greigita y la magnetita. Este hallazgo amplía nuestra comprensión de las bacterias magnetotácticas y sus capacidades únicas de biomineralización.
Área de la Ciencia:
- Microbiología Microbiología.
- La biomineralización es la biomineralización.
- El geomagnetismo es el geomagnetismo.
Sus antecedentes:
- Las bacterias magnetotácticas poseen nanocristales magnéticos intracelulares (magnetosomas) compuestos de magnetita o greigita.
- Estos magnetosomas permiten a las bacterias alinearse y navegar a lo largo de las líneas de campo geomagnético de la Tierra.
Objetivo del estudio:
- Para aislar y caracterizar una nueva bacteria magnetotactica de un manantial salobre.
- Investigar la ubicación filogenética y la base genética de la biomineralización del magnetosoma en esta nueva cepa.
Principales métodos:
- Aislamiento y cultivo de bacterias magnetotacticas de un manantial del Valle de la Muerte.
- Análisis filogenético utilizando secuenciación de genes de ARNr 16S.
- Análisis genómico para identificar grupos de genes de magnetosomas.
Principales resultados:
- Aislamiento de la cepa BW-1, una bacteria magnetotactica que produce greigita y magnetita.
- El análisis filogenético reveló que BW-1 pertenece a un grupo previamente no reconocido de Deltaproteobacteria reductoras de sulfatos.
- Los datos genómicos indicaron la presencia de dos grupos de genes magnetosómicos distintos.
Conclusiones:
- La cepa BW-1 representa un nuevo linaje de bacterias magnetotacticas reductoras de sulfatos.
- Los dos grupos de genes del magnetosoma pueden ser diferencialmente responsables de la greigita y la biomineralización de la magnetita.
- Este descubrimiento mejora nuestro conocimiento de la navegación magnética microbiana y la diversidad de la biomineralización.
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