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Light-induced Dissociation of an Antenna Hetero-oligomer Is Needed for Non-photochemical Quenching Induction
TLDR
PsbS controls the association/dissociation of a five-subunit membrane complex, composed of two monomeric Lhcb proteins (CP29 and CP24) and the trimeric LHCII-M and shows that changes are reversible and do not require protein synthesis/degradation, thus allowing for changes in PSII antenna size and adaptation to rapidly changing environmental conditions.
Zeaxanthin Has Enhanced Antioxidant Capacity with Respect to All Other Xanthophylls in Arabidopsis Leaves and Functions Independent of Binding to PSII Antennae1[C][W]
TLDR
The results indicate that the antioxidant activity of zeaxanthin, distinct from NPQ, can occur in the absence of PSII light-harvesting complexes.
Contrasting Behavior of Higher Plant Photosystem I and II Antenna Systems during Acclimation*
TLDR
Photosystem I light harvesting function was shown to be regulated through different mechanisms like the control of photosystem I to photosystem II ratio and the association or dissociation of Lhcb polypeptides to photoystem I.
A zeaxanthin-independent nonphotochemical quenching mechanism localized in the photosystem II core complex.
TLDR
Reaction-center quenching seems to be a common transient feature during illumination, being replaced by other phenomena (photochemical or antenna quenched and photoinhibition), depending on the balance between light and carbon fixation fluxes.
Lutein is needed for efficient chlorophyll triplet quenching in the major LHCII antenna complex of higher plants and effective photoprotection in vivo under strong light
TLDR
It is concluded that zeaxanthin is effective in photoprotection of plants lacking lutein due to the multiple effects of zeAXanthin in photOProtection, including ROS scavenging and direct quenching of Chl fluorescence by binding to the L2 allosteric site of Lhc proteins.
The Effect of Zeaxanthin as the Only Xanthophyll on the Structure and Function of the Photosynthetic Apparatus in Arabidopsis thaliana*
TLDR
While PSII photoinhibition was similar in wild type and lut2 npq2 exposed to high light at low temperature, the double mutant was much more resistant to photooxidative stress and lipid peroxidation than the wild type, consistent with an antioxidant and lipid protective role of zeaxanthin in vivo.
Evolution and functional properties of photosystem II light harvesting complexes in eukaryotes.
TLDR
Current knowledge of LHC proteins serving Photosystem II is reviewed, focusing on the role of each antenna complex in light harvesting, energy transfer, scavenging of reactive oxygen species, chlorophyll triplet quenching and thermal dissipation of excess energy.
Mechanistic aspects of the xanthophyll dynamics in higher plant thylakoids
TLDR
The xanthophyll exchange rate is determined by the structure of individual Lhc gene products and it is specifically controlled by the lumenal pH independently from the activation state of the violaxanthin deepoxidase enzyme.
A Mechanism of Nonphotochemical Energy Dissipation, Independent from PsbS, Revealed by a Conformational Change in the Antenna Protein CP26w⃞
TLDR
Results confirm that LHC proteins exist in multiple conformations, an idea suggested by previous spectroscopic measurements, and imply that the switch between the different LHC protein conformations is activated by the binding of zeaxanthin to the allosteric site L2.
Photoprotection in the Antenna Complexes of Photosystem II
TLDR
The comparison of native LHCII trimeric complexes with different carotenoid composition shows that the xanthophylls in sites V1 and N1 do not directly contribute to the chlorophyll triplet quenching, suggesting that their inner domains are more accessible for O2.
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