Violaxanthin inhibits nonphotochemical quenching in light-harvesting antenna of Chromera velia
Language English Country England, Great Britain Media print-electronic
Document type Letter, Research Support, Non-U.S. Gov't
Grant support
Biotechnology and Biological Sciences Research Council - United Kingdom
- Keywords
- Chromera velia, light-harvesting antennae, nonphotochemical quenching, photoprotection, violaxanthin, zeaxanthin,
- MeSH
- Alveolata cytology metabolism radiation effects MeSH
- Time Factors MeSH
- Chlorophyll metabolism MeSH
- Fluorescence MeSH
- Photochemical Processes * MeSH
- Light-Harvesting Protein Complexes isolation & purification metabolism MeSH
- Xanthophylls metabolism MeSH
- Publication type
- Letter MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Chlorophyll MeSH
- Light-Harvesting Protein Complexes MeSH
- violaxanthin MeSH Browser
- Xanthophylls MeSH
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.
Faculty of Sciences University of South Bohemia České Budějovice Czech Republic
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
References provided by Crossref.org
Size and Fluorescence Properties of Algal Photosynthetic Antenna Proteins Estimated by Microscopy
Antenna proton sensitivity determines photosynthetic light harvesting strategy
High light acclimation of Chromera velia points to photoprotective NPQ
Role of Ions in the Regulation of Light-Harvesting
