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Violaxanthin inhibits nonphotochemical quenching in light-harvesting antenna of Chromera velia

R. Kaňa, E. Kotabová, J. Kopečná, E. Trsková, E. Belgio, R. Sobotka, AV. Ruban,

. 2016 ; 590 (8) : 1076-85. [pub] 20160404

Language English Country England, Great Britain

Document type Letter

Persistent link   https://www.medvik.cz/link/bmc17024113

Non-photochemical quenching (NPQ) is a photoprotective mechanism in light-harvesting antennae. NPQ is triggered by chloroplast thylakoid lumen acidification and is accompanied by violaxanthin de-epoxidation to zeaxanthin, which further stimulates NPQ. In the present study, we show that violaxanthin can act in the opposite direction to zeaxanthin because an increase in the concentration of violaxanthin reduced NPQ in the light-harvesting antennae of Chromera velia. The correlation overlapped with a similar relationship between violaxanthin and NPQ as observed in isolated higher plant light-harvesting complex II. The data suggest that violaxanthin in C. velia can act as an inhibitor of NPQ, indicating that violaxanthin has to be removed from the vicinity of the protein to reach maximal NPQ.

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$a Non-photochemical quenching (NPQ) is a photoprotective mechanism in light-harvesting antennae. NPQ is triggered by chloroplast thylakoid lumen acidification and is accompanied by violaxanthin de-epoxidation to zeaxanthin, which further stimulates NPQ. In the present study, we show that violaxanthin can act in the opposite direction to zeaxanthin because an increase in the concentration of violaxanthin reduced NPQ in the light-harvesting antennae of Chromera velia. The correlation overlapped with a similar relationship between violaxanthin and NPQ as observed in isolated higher plant light-harvesting complex II. The data suggest that violaxanthin in C. velia can act as an inhibitor of NPQ, indicating that violaxanthin has to be removed from the vicinity of the protein to reach maximal NPQ.
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$a Kotabová, Eva $u Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic. Faculty of Sciences, University of South Bohemia, České Budějovice, Czech Republic.
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$a Kopečná, Jana $u Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic.
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$a Trsková, Eliška $u Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic. Faculty of Sciences, University of South Bohemia, České Budějovice, Czech Republic.
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$a Belgio, Erica $u Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic. School of Biological and Chemical Sciences, Queen Mary University of London, UK.
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$a Sobotka, Roman $u Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic. Faculty of Sciences, University of South Bohemia, České Budějovice, Czech Republic.
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$a Ruban, Alexander V $u School of Biological and Chemical Sciences, Queen Mary University of London, UK.
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