Plastocyanin is the long-range electron carrier between photosystem II and photosystem I in plants.
diffusion-dependent electron transport
photosynthesis
plastocyanin
plastoquinone
thylakoid membrane
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
30 06 2020
30 06 2020
Historique:
pubmed:
17
6
2020
medline:
2
9
2020
entrez:
17
6
2020
Statut:
ppublish
Résumé
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.
Identifiants
pubmed: 32541018
pii: 2005832117
doi: 10.1073/pnas.2005832117
pmc: PMC7334583
doi:
Substances chimiques
Photosystem I Protein Complex
0
Photosystem II Protein Complex
0
Plastocyanin
9014-09-9
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
15354-15362Déclaration de conflit d'intérêts
The authors declare no competing interest.
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