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Violaxanthin Inhibits Nonphotochemical Quenching in Light-Harvesting Antenna of Chromera Velia

Violaxanthin Inhibits Nonphotochemical Quenching in Light-Harvesting Antenna of Chromera Velia

Radek Kaňa, Eva Kotabová, Jana Kopečná, Eliška Trsková, Erica Belgio, Roman Sobotka, Alexander V Ruban

FEBS Lett. 2016 Apr;590(8):1076-85.

PMID: 26988983

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP126294	Violaxanthin		126-29-4	Price

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