Photosystem I light-harvesting proteins regulate photosynthetic electron transfer and hydrogen production.
Journal
Plant physiology
ISSN: 1532-2548
Titre abrégé: Plant Physiol
Pays: United States
ID NLM: 0401224
Informations de publication
Date de publication:
03 05 2022
03 05 2022
Historique:
received:
09
11
2021
accepted:
23
01
2022
pubmed:
15
2
2022
medline:
10
5
2022
entrez:
14
2
2022
Statut:
ppublish
Résumé
Linear electron flow (LEF) and cyclic electron flow (CEF) compete for light-driven electrons transferred from the acceptor side of photosystem I (PSI). Under anoxic conditions, such highly reducing electrons also could be used for hydrogen (H2) production via electron transfer between ferredoxin and hydrogenase in the green alga Chlamydomonas reinhardtii. Partitioning between LEF and CEF is regulated through PROTON-GRADIENT REGULATION5 (PGR5). There is evidence that partitioning of electrons also could be mediated via PSI remodeling processes. This plasticity is linked to the dynamics of PSI-associated light-harvesting proteins (LHCAs) LHCA2 and LHCA9. These two unique light-harvesting proteins are distinct from all other LHCAs because they are loosely bound at the PSAL pole. Here, we investigated photosynthetic electron transfer and H2 production in single, double, and triple mutants deficient in PGR5, LHCA2, and LHCA9. Our data indicate that lhca2 and lhca9 mutants are efficient in photosynthetic electron transfer, that LHCA2 impacts the pgr5 phenotype, and that pgr5/lhca2 is a potent H2 photo-producer. In addition, pgr5/lhca2 and pgr5/lhca9 mutants displayed substantially different H2 photo-production kinetics. This indicates that the absence of LHCA2 or LHCA9 impacts H2 photo-production independently, despite both being attached at the PSAL pole, pointing to distinct regulatory capacities.
Identifiants
pubmed: 35157085
pii: 6528336
doi: 10.1093/plphys/kiac055
pmc: PMC9070821
doi:
Substances chimiques
Photosystem I Protein Complex
0
Protons
0
Tumor Necrosis Factor Ligand Superfamily Member 14
0
Hydrogen
7YNJ3PO35Z
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
329-343Informations de copyright
© The Author(s) 2022. Published by Oxford University Press on behalf of American Society of Plant Biologists.
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