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In situ electrosynthetic bacterial growth using electricity generated by a deep-sea hydrothermal vent
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In situ electrosynthetic bacterial growth using electricity generated by a deep-sea hydrothermal vent
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Journal Article
In situ electrosynthetic bacterial growth using electricity generated by a deep-sea hydrothermal vent
2023
Overview
Electroautotrophic microorganisms have attracted great attention since they exhibit a new type of primary production. Here, in situ electrochemical cultivation was conducted using the naturally occurring electromotive forces at a deep-sea hydrothermal vent. The voltage and current generation originating from the resulting microbial activity was observed for 12 days of deployment, with fluctuation in response to tidal cycles. A novel bacterium belonging to the genus
Thiomicrorhabdus
dominated the microbial community specifically enriched on the cathode. Metagenomic analysis provided the draft genome of the bacterium and the gene repertoire indicated that the bacterium has the potential for thio-autotrophic growth, which is a typical physiological feature of the members of the genus, while the bacterium had a unique gene cluster encoding multi-heme cytochrome
c
proteins responsible for extracellular electron transfer. Herein, we propose this bacterium as a new species, specifically enriched during electricity generation, as ‘
Candidatus
Thiomicrorhabdus electrophagus’. This finding suggests the natural occurrence of electrosynthetic microbial populations using the geoelectricity in deep-sea hydrothermal environments.
Publisher
Nature Publishing Group UK,Oxford University Press
Subject
