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Plastocyanin is the long-range electron carrier between photosystem II and photosystem I in plants
R. Höhner, M. Pribil, M. Herbstová, LS. Lopez, HH. Kunz, M. Li, M. Wood, V. Svoboda, S. Puthiyaveetil, D. Leister, H. Kirchhoff,
Language English Country United States
Document type Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.
NLK
Free Medical Journals
from 1915 to 6 months ago
Freely Accessible Science Journals
from 1915 to 6 months ago
PubMed Central
from 1915 to 6 months ago
Europe PubMed Central
from 1915 to 6 months ago
Open Access Digital Library
from 1915-01-01
Open Access Digital Library
from 1915-01-15
- MeSH
- Models, Biological MeSH
- Photosystem I Protein Complex metabolism MeSH
- Photosystem II Protein Complex metabolism MeSH
- Magnoliopsida physiology MeSH
- Plastocyanin metabolism MeSH
- Computer Simulation MeSH
- Gene Expression Regulation, Plant physiology MeSH
- Electron Transport MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Research Support, U.S. Gov't, Non-P.H.S. MeSH
In photosynthetic electron transport, large multiprotein complexes are connected by small diffusible electron carriers, the mobility of which is challenged by macromolecular crowding. For thylakoid membranes of higher plants, a long-standing question has been which of the two mobile electron carriers, plastoquinone or plastocyanin, mediates electron transport from stacked grana thylakoids where photosystem II (PSII) is localized to distant unstacked regions of the thylakoids that harbor PSI. Here, we confirm that plastocyanin is the long-range electron carrier by employing mutants with different grana diameters. Furthermore, our results explain why higher plants have a narrow range of grana diameters since a larger diffusion distance for plastocyanin would jeopardize the efficiency of electron transport. In the light of recent findings that the lumen of thylakoids, which forms the diffusion space of plastocyanin, undergoes dynamic swelling/shrinkage, this study demonstrates that plastocyanin diffusion is a crucial regulatory element of plant photosynthetic electron transport.
Institute of Biological Chemistry Washington State University Pullman WA 99164 6340
School of Biological Sciences Washington State University Pullman WA 99164 4236
References provided by Crossref.org
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- $a In photosynthetic electron transport, large multiprotein complexes are connected by small diffusible electron carriers, the mobility of which is challenged by macromolecular crowding. For thylakoid membranes of higher plants, a long-standing question has been which of the two mobile electron carriers, plastoquinone or plastocyanin, mediates electron transport from stacked grana thylakoids where photosystem II (PSII) is localized to distant unstacked regions of the thylakoids that harbor PSI. Here, we confirm that plastocyanin is the long-range electron carrier by employing mutants with different grana diameters. Furthermore, our results explain why higher plants have a narrow range of grana diameters since a larger diffusion distance for plastocyanin would jeopardize the efficiency of electron transport. In the light of recent findings that the lumen of thylakoids, which forms the diffusion space of plastocyanin, undergoes dynamic swelling/shrinkage, this study demonstrates that plastocyanin diffusion is a crucial regulatory element of plant photosynthetic electron transport.
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