Journal
SCIENCE ADVANCES
Volume 4, Issue 2, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aao5682
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Funding
- Japan Society for Promotion of Science KAKENHI [24000010, 17H04969, 16J07690]
- Sumitomo Foundation
- U.S. Office of Naval Research Global [N62909-17-1-2038]
- Japan Agency for Medical Research and Development [17gm6010002h0002]
- Grants-in-Aid for Scientific Research [16J07690] Funding Source: KAKEN
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Bacterial reduction of oxidized sulfur species (OSS) is critical for energy production in anaerobic marine subsurfaces. In organic-poor sediments, H-2 has been considered as a major energy source for bacterial respiration. We identified outer-membrane cytochromes (OMCs) that are broadly conserved in sediment OSS-respiring bacteria and enable cells to directly use electrons from insoluble minerals via extracellular electron transport. Biochemical, transcriptomic, and microscopic analyses revealed that the identified OMCs were highly expressed on the surface of cells and nanofilaments in response to electron donor limitation. This electron uptake mechanism provides sufficient but minimum energy to drive the reduction of sulfate and other OSS. These results suggest a widespread mechanism for survival of OSS-respiring bacteria via electron uptake from solid minerals in energy-poor marine sediments.
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