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Redox-coupled proton pumping drives carbon concentration in the photosynthetic complex I

Author

Listed:
  • Jan M. Schuller

    (Max Planck Institute of Biochemistry)

  • Patricia Saura

    (Stockholm University
    Technical University of Munich)

  • Jacqueline Thiemann

    (Ruhr University Bochum)

  • Sandra K. Schuller

    (Max Planck Institute of Biochemistry)

  • Ana P. Gamiz-Hernandez

    (Stockholm University
    Technical University of Munich)

  • Genji Kurisu

    (Osaka University, Suita
    Osaka University)

  • Marc M. Nowaczyk

    (Ruhr University Bochum)

  • Ville R. I. Kaila

    (Stockholm University
    Technical University of Munich)

Abstract

Photosynthetic organisms capture light energy to drive their energy metabolism, and employ the chemical reducing power to convert carbon dioxide (CO2) into organic molecules. Photorespiration, however, significantly reduces the photosynthetic yields. To survive under low CO2 concentrations, cyanobacteria evolved unique carbon-concentration mechanisms that enhance the efficiency of photosynthetic CO2 fixation, for which the molecular principles have remained unknown. We show here how modular adaptations enabled the cyanobacterial photosynthetic complex I to concentrate CO2 using a redox-driven proton-pumping machinery. Our cryo-electron microscopy structure at 3.2 Å resolution shows a catalytic carbonic anhydrase module that harbours a Zn2+ active site, with connectivity to proton-pumping subunits that are activated by electron transfer from photosystem I. Our findings illustrate molecular principles in the photosynthetic complex I machinery that enabled cyanobacteria to survive in drastically changing CO2 conditions.

Suggested Citation

  • Jan M. Schuller & Patricia Saura & Jacqueline Thiemann & Sandra K. Schuller & Ana P. Gamiz-Hernandez & Genji Kurisu & Marc M. Nowaczyk & Ville R. I. Kaila, 2020. "Redox-coupled proton pumping drives carbon concentration in the photosynthetic complex I," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14347-4
    DOI: 10.1038/s41467-020-14347-4
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    Cited by:

    1. Adel Beghiah & Patricia Saura & Sofia Badolato & Hyunho Kim & Johanna Zipf & Dirk Auman & Ana P. Gamiz-Hernandez & Johan Berg & Grant Kemp & Ville R. I. Kaila, 2024. "Dissected antiporter modules establish minimal proton-conduction elements of the respiratory complex I," Nature Communications, Nature, vol. 15(1), pages 1-14, December.

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