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

Jan M. Schuller (), Patricia Saura, Jacqueline Thiemann, Sandra K. Schuller, Ana P. Gamiz-Hernandez, Genji Kurisu, Marc M. Nowaczyk () and Ville R. I. Kaila ()
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Jan M. Schuller: Max Planck Institute of Biochemistry
Patricia Saura: Stockholm University
Jacqueline Thiemann: Ruhr University Bochum
Sandra K. Schuller: Max Planck Institute of Biochemistry
Ana P. Gamiz-Hernandez: Stockholm University
Genji Kurisu: Osaka University, Suita
Marc M. Nowaczyk: Ruhr University Bochum
Ville R. I. Kaila: Stockholm University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-14347-4

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