Journal
FEBS LETTERS
Volume 585, Issue 12, Pages 1941-1945Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2011.05.015
Keywords
Non-photochemical fluorescence quenching; Light-harvesting; Violaxanthin; Xanthophyll cycle; Chromerida (Chromera velia); Eustigmatophyceae (Nannochloropsis limnetica)
Funding
- Grant Agency of Academy of Sciences [GAAV IAA601410907]
- Agency of the Czech Republic [GACR 206/09/094]
- institutional research concepts [AV0Z50200510, MSM6007665808]
- project Algatech [CZ.1.05/2.1.00/03.0110]
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Non-photochemical quenching (NPQ) is a mechanism protecting photosynthetic organisms against excessive irradiation. Here, we analyze a unique NPQ mechanism in the alga Chromera velia, a recently discovered close relative of apicomplexan parasites. NPQ in C. velia is enabled by an operative and fast violaxanthin de-epoxidation to zeaxanthin without accumulation of antheraxanthin. In C. velia violaxanthin also serves as a main light-harvesting pigment. Therefore, in C. velia violaxanthin acts as a key factor in both light harvesting and photoprotection. This is in contrast to a similar alga, Nannochloropsis limnetica, where violaxanthin has only light-harvesting function. (C) 2011 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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