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Electron uptake by iron-oxidizing phototrophic bacteria

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  • A. Bose

    (Harvard University, 16 Divinity Avenue)

  • E.J. Gardel

    (Harvard University, 16 Divinity Avenue
    School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street)

  • C. Vidoudez

    (Harvard University, 16 Divinity Avenue)

  • E.A. Parra

    (Harvard University, 16 Divinity Avenue)

  • P.R. Girguis

    (Harvard University, 16 Divinity Avenue)

Abstract

Oxidation–reduction reactions underlie energy generation in nearly all life forms. Although most organisms use soluble oxidants and reductants, some microbes can access solid-phase materials as electron-acceptors or -donors via extracellular electron transfer. Many studies have focused on the reduction of solid-phase oxidants. Far less is known about electron uptake via microbial extracellular electron transfer, and almost nothing is known about the associated mechanisms. Here we show that the iron-oxidizing photoautotroph Rhodopseudomonas palustris TIE-1 accepts electrons from a poised electrode, with carbon dioxide as the sole carbon source/electron acceptor. Both electron uptake and ruBisCo form I expression are stimulated by light. Electron uptake also occurs in the dark, uncoupled from photosynthesis. Notably, the pioABC operon, which encodes a protein system essential for photoautotrophic growth by ferrous iron oxidation, influences electron uptake. These data reveal a previously unknown metabolic versatility of photoferrotrophs to use extracellular electron transfer for electron uptake.

Suggested Citation

  • A. Bose & E.J. Gardel & C. Vidoudez & E.A. Parra & P.R. Girguis, 2014. "Electron uptake by iron-oxidizing phototrophic bacteria," Nature Communications, Nature, vol. 5(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4391
    DOI: 10.1038/ncomms4391
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    Cited by:

    1. Dong, Guowen & Chen, Yibin & Yan, Zhiying & Zhang, Jing & Ji, Xiaoliang & Wang, Honghui & Dahlgren, Randy A. & Chen, Fang & Shang, Xu & Chen, Zheng, 2020. "Recent advances in the roles of minerals for enhanced microbial extracellular electron transfer," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
    2. Pan, Qin & Tian, Xiaochun & Li, Junpeng & Wu, Xuee & Zhao, Feng, 2021. "Interfacial electron transfer for carbon dioxide valorization in hybrid inorganic-microbial systems," Applied Energy, Elsevier, vol. 292(C).

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