The Plastid Lipocalin LCNP Is Required for Sustained Photoprotective Energy Dissipation in Arabidopsis

Abstract : Light utilization is finely tuned in photosynthetic organisms to prevent cellular damage. The dissipation of excess absorbed light energy, a process termed nonphotochemical quenching (NPQ), plays an important role in photoprotection. Little is known about the sustained or slowly reversible form(s) of NPQ and whether they are photoprotective, in part due to the lack of mutants. The Arabidopsis thaliana suppressor of quenching1 (soq1) mutant exhibits enhanced sustained NPQ, which we term qH. To identify molecular players involved in qH, we screened for suppressors of soq1 and isolated mutants affecting either chlorophyllide a oxygenase or the chloroplastic lipocalin, now renamed plastid lipocalin (LCNP). Analysis of the mutants confirmed that qH is localized to the peripheral antenna (LHCII) of photosystem II and demonstrated that LCNP is required for qH, either directly (by forming NPQ sites) or indirectly (by modifying the LHCII membrane environment). qH operates under stress conditions such as cold and high light and is photoprotective, as it reduces lipid peroxidation levels. We propose that, under stress conditions, LCNP protects the thylakoid membrane by enabling sustained NPQ in LHCII, thereby preventing singlet oxygen stress.
Type de document :
Article dans une revue
The Plant cell, American Society of Plant Biologists (ASPB), 2018, 30 (1), pp.196-208. 〈10.1105/tpc.17.00536〉
Liste complète des métadonnées

Littérature citée [23 références]  Voir  Masquer  Télécharger

https://hal-amu.archives-ouvertes.fr/hal-01856102
Contributeur : Catherine Sarrobert <>
Soumis le : jeudi 9 août 2018 - 16:38:56
Dernière modification le : samedi 11 août 2018 - 01:10:42

Fichier

Malnoe et al.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Alizée Malnoë, Alex Schultink, Sanya Shahrasbi, Dominique Rumeau, Michel Havaux, et al.. The Plastid Lipocalin LCNP Is Required for Sustained Photoprotective Energy Dissipation in Arabidopsis. The Plant cell, American Society of Plant Biologists (ASPB), 2018, 30 (1), pp.196-208. 〈10.1105/tpc.17.00536〉. 〈hal-01856102〉

Partager

Métriques

Consultations de la notice

516

Téléchargements de fichiers

5