Journal
FEBS LETTERS
Volume 471, Issue 1, Pages 71-74Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0014-5793(00)01369-7
Keywords
non-photochemical quenching; light harvesting complex; xanthophyll cycle; chlorophyll fluorescence; thylakoid membrane
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Non-photochemical quenching of chlorophyll fluorescence in plants occurs in the light harvesting antenna of photosystem II and is regulated by the xanthophyll cycle. A nem in vitro model for this process has been developed. Purified light harvesting complexes above the detergent critical micelle concentration have a stable high fluorescence yield but a rapidly inducible fluorescence quenching occurs upon addition of zeaxanthin. Violaxanthin was without effect, lutein and antheraxanthin induced a marginal response, whereas the violaxanthin analogue, auroxanthin, induced strong quenching. Quenching was not caused by aggregation of the complexes but was accompanied by a spectral broadening and red shift, indicating a zeaxanthin-dependent alteration in the chlorophyll environment. (C) 2000 Federation of European Biochemical Societies.
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