Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 26, Pages 15354-15362Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2005832117
Keywords
photosynthesis; diffusion-dependent electron transport; plastocyanin; plastoquinone; thylakoid membrane
Categories
Funding
- NSF [MCB-1158571]
- US Department of Agriculture National Institute of Food and Agriculture [0119, 1015621]
- Department of Energy (DOE)-Basic Energy Sciences [DOE-DE-SC0017160]
- ALGAMAN Project - European Social Fund [CZ.1.07/2.3.00/20.0203]
- Deutsche Forschungsgemeinschaft [LE 1265/29-1 (FOR 2092), TRR 175]
- [RVO:60077344]
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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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