Apr 9, 2014

Mobile hydrogen carbonate acts as proton acceptor in photosynthetic water oxidation

Proceedings of the National Academy of Sciences of the United States of America
Sergey KoroidovJohannes Messinger

Abstract

Cyanobacteria, algae, and plants oxidize water to the O2 we breathe, and consume CO2 during the synthesis of biomass. Although these vital processes are functionally and structurally well separated in photosynthetic organisms, there is a long-debated role for CO2/ in water oxidation. Using membrane-inlet mass spectrometry we demonstrate that acts as a mobile proton acceptor that helps to transport the protons produced inside of photosystem II by water oxidation out into the chloroplast's lumen, resulting in a light-driven production of O2 and CO2. Depletion of from the media leads, in the absence of added buffers, to a reversible down-regulation of O2 production by about 20%. These findings add a previously unidentified component to the regulatory network of oxygenic photosynthesis and conclude the more than 50-y-long quest for the function of CO2/ in photosynthetic water oxidation.

  • References36
  • Citations12

References

  • References36
  • Citations12

Citations

Mentioned in this Paper

Buffers
Dioxygen
Oxygen Isotopes
Entire Lumen of Body System
Carbonic Acid Ions
Chloroplasts
Protons
Oxygen Evolving Activity
Oxidation
Mass Spectrometry

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