Plastocyanin is the long-range electron carrier between photosystem II and photosystem I in plants

0532600 - BC 2021 RIV US eng J - Journal Article
Hoehner, R. - Pribil, M. - Herbstová, Miroslava - Lopez, L. S. - Kunz, H. - Li, M. - Wood, M. - Svoboda, V. - Puthiyaveetil, S. - Leister, D. - Kirchhoff, H.
Plastocyanin is the long-range electron carrier between photosystem II and photosystem I in plants.
Proceedings of the National Academy of Sciences of the United States of America. Roč. 117, č. 26 (2020), s. 15354-15362. ISSN 0027-8424. E-ISSN 1091-6490
Institutional support: RVO:60077344
Keywords : photosynthesis * diffusion-dependent electron transport * plastocyanin * plastoquinone * thylakoid membrane
OECD category: Plant sciences, botany
Impact factor: 11.205, year: 2020
Method of publishing: Limited access
https://www.pnas.org/content/117/26/15354

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.
Permanent Link: http://hdl.handle.net/11104/0311041