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Detection of coenzyme F430 in deep sea sediments: A key molecule for biological methanogenesis

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Kahnt,  Jörg
Department of Ecophysiology, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Shima,  Seigo
Department-Independent Research Group Microbial Protein Structure, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;

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Citation

Takano, Y., Kaneko, M., Kahnt, J., Imachi, H., Shima, S., & Ohkouchi, N. (2013). Detection of coenzyme F430 in deep sea sediments: A key molecule for biological methanogenesis. Organic Geochemistry, 58, 137-140. doi:10.1016/j.orggeochem.2013.01.012.


Cite as: http://hdl.handle.net/21.11116/0000-0007-BF7D-7
Abstract
We report the presence of coenzyme factor 430 (F430), a prosthetic group of methyl coenzyme M reductase for archaeal methanogenesis, in the deep sub-seafloor biosphere. At 106.7 m depth in sediment collected off Shimokita Peninsula, northwestern Pacific, its concentration was estimated to be at least 40 fmol g sediment−1 (i.e. 36 pg g−1 wet sediment). This is about three orders of magnitude lower than typical concentrations of archaeal intact polar lipids in similar sub-seafloor sediments. On the basis of the concentration of F430 in methanogens and conversion to biomass composed of typical sub-seafloor microbial cells, we estimated that ca. 2 × 106 cells g−1 could be methanogens in the deeply buried marine sediment.