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[[Vol. 64]Biogenic Iron Sulfide Nanoparticles Enable Electron Uptake in Bacteria_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/97e07a56-e2c5-43b8-9766-e2835590aa5d/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.64] Biogenic Iron Sulfide Nanoparticles Enable Electron Uptake in Bacteria](https://mdr.nims.go.jp/datasets/33b85bac-55b6-4091-a6c4-56dfcd94c7b0)

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2022/03/31 16:20 Biogenic Iron Sulfide Nanoparticles Enable Electron Uptake in Bacteria| MANAhttps://www.nims.go.jp/mana/research/highlights/vol64.html 1/2Previous  Index  NextResearch Highlights[Vol. 64]Biogenic Iron Sulfide Nanoparticles Enable Electron Uptake in Bacteria20 Nov, 2020A MANA team has identified the mechanism underlying the synthesis of long, electricallyconductive pathways via iron sulfide (FeS) nanoparticles (NPs) in bacteria. This hasimplications in the development of new ways to inhibit microbial iron corrosion, as wellas understanding the pathways of organic matter preservation in marine systems.Many bacterial species are capable of biosynthesizing NPs. These nanoparticles are ubiquitous innature, and the formation of FeS minerals is driven by the reaction between ferrous compoundsand the free sulfide predominantly produced by sulfate-reducing bacteria (SRB), which produce97% of the sulfide on earth through their metabolic activity.Biosynthesized NPs facilitate microbial energy production in various environments, includingextreme conditions. However, until now little research has been done on the biological role of FeSNPs in such bacteria.The MANA team identified FeS NPs with electrically conductive crystal phase associated withcellular membrane of the SRB D. vulgaris. They showed that the conductive NPs can function as anelectron conduit, enabling bacteria to utilize solid-state electron donors via direct electron uptake.This is the first report of SRB utilizing solid-state electron donors via direct extracellular electronuptake. This strategy does not require organic electron donors and would therefore be especiallyhttps://www.nims.go.jp/mana/research/highlights/vol63.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol65.html2022/03/31 16:20 Biogenic Iron Sulfide Nanoparticles Enable Electron Uptake in Bacteria| MANAhttps://www.nims.go.jp/mana/research/highlights/vol64.html 2/2effective in sediments containing highly reductive minerals.Since microbial sulfate reduction is the most important pathway for organic matter remineralizationin marine sediments, the biogeochemical cycles of iron and sulfur facilitated by the metabolicactivity of SRB are intimately linked to the carbon cycle.This research provides new insights into the interplay and evolution of biogeochemical cyclesincluding iron, sulfur and carbon. In addition, clarifying the mechanism behind the synthesis oflong, electrically conductive pathways via FeS NPs could lead to effective strategies for inhibitingmicrobial iron corrosion.This research was carried out by Akihiro Okamoto(Independent Scientist) and his collaborators.Reference“Biogenic Iron Sulfide Nanoparticles to Enable Extracellular Electron Uptake in Sulfate-ReducingBacteria”Xiao Deng, Naoshi Dohmae, Anna H. Kaksonen and Akihiro OkamotoJournal: Angew Chem Int Ed Engl. 2020 Apr 6;59(15):5995-5999. [25 December 2019]DOI : 10.1002/ange.201915196(Press release on this research)"Formation of Black Rust Accelerates Bacteiral Iron Corrosion” (14 February 2020)https://www.nims.go.jp/mana/news_room/press/2020021401.html（MANA E-BULLETIN）https://www.nims.go.jp/mana/ebulletin/AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/okamoto_akihiro?locale=enhttps://samurai.nims.go.jp/profiles/okamoto_akihiro?locale=enhttps://doi.org/10.1002/ange.201915196https://www.nims.go.jp/mana/news_room/press/2020021401.htmlhttps://www.nims.go.jp/mana/ebulletin/