The xanthophyll cycle affects reversible interactions between PsbS and light-harvesting complex II to control non-photochemical quenching
Joanna Sacharz, Vasco Giovagnetti, Petra Ungerer, Giulia Mastroianni, Alexander V Ruban
Nature Plants | NATURE PUBLISHING GROUP | Published : 2017
To maintain high photosynthetic rates, plants must adapt to their light environment on a timescale of seconds to minutes. Therefore, the light-harvesting antenna system of photosystem II in thylakoid membranes, light-harvesting complex II (LHCII), has a feedback mechanism, which determines the proportion of absorbed energy dissipated as heat: non-photochemical chlorophyll fluorescence quenching (NPQ). This is crucial to prevent photo-oxidative damage to photosystem II (PSII) and is controlled by the transmembrane pH differences (ΔpH). High ΔpH activates NPQ by protonation of the protein PsbS and the enzymatic de-epoxidation of LHCII-bound violaxanthin to zeaxanthin. But the precise role of P..View full abstract
Awarded by Biotechnology and Biological Sciences Research Council
A.V.R. acknowledges funding from the Biotechnology and Biological Sciences Research Council of the UK and the Leverhulme Trust. The authors acknowledge Y. Tian for the help with plant growth, as well asM. Johnson and C. Duffy for critical reading of the manuscript.