Enhanced photoprotection by protein-bound vs free xanthophyll pools: a comparative analysis of chlorophyll b and xanthophyll biosynthesis mutants

Molecular Plant
Luca Dall'OstoRoberto Bassi

Abstract

When light absorbed by plants exceeds the capacity of photosynthesis, the xanthophyll violaxanthin is reversibly de-epoxidized to zeaxanthin in the so-called xanthophyll cycle. Zeaxanthin plays a key role in the protection of photosynthetic organisms against excess light, by promoting rapidly reversible (qE) and long-term (qI) quenching of excited chlorophylls, and preventing lipid oxidation. The photoprotective role of zeaxanthin, either free or bound to light-harvesting complexes (Lhcs), has been investigated by using mutants lacking Chl b (ch1) and/or specific xanthophyll species (npq, lut2). The ch1 mutation causes (1) the absence of Lhcb proteins; (2) strong reduction of the feedback de-excitation (qE); and (3) accumulation of xanthophylls as free pigments into thylakoids. Ch1 mutants showed extreme sensitivity to photo-oxidative stress in high light, due to higher singlet oxygen (¹O₂) release. The double mutant ch1npq1 was more sensitive to photo-oxidation than ch1, showing that zeaxanthin does protect lipids even when free in the membrane. Nevertheless, lack of zeaxanthin had a much stronger impact on the level of lipid peroxidation in Lhcs-containing plants (WT vs npq1) with respect to Lhc-less plants (ch1 vs ch1npq1), ...Continue Reading

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Citations

Mar 26, 2013·Plant Molecular Biology·Maïna FlorisElodie Lanet
May 29, 2010·The Journal of Biological Chemistry·Giorgia SagaTomas Morosinotto
Jan 17, 2013·Antioxidants & Redox Signaling·Beat B FischerAnja Krieger-Liszkay
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Mar 5, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Luca Dall'OstoRoberto Bassi
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Jun 14, 2016·Biochemistry·Stefano CazzanigaLuca Dall'Osto

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