期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 17, 页码 6299-6304出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1323277111
关键词
carbon dioxide; bicarbonate; proton release; oxygen evolution; water splitting
资金
- Vetenskapsradet
- Energimyndigheten
- Kempe Stiftelse
- Strong Research Environment Solar Fuels (Umea University)
- Artificial Leaf Project Umea (Knut and Alice Wallenberg Foundation)
Cyanobacteria, algae, and plants oxidize water to the O-2 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/HCO3 in water oxidation. Using membrane-inlet mass spectrometry we demonstrate that HCO3 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 O-2 and CO2. Depletion of HCO3 from the media leads, in the absence of added buffers, to a reversible down-regulation of O-2 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/ HCO3 in photosynthetic water oxidation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据