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  • Title: Chlorophyll fluorescence quenching in isolated light harvesting complexes induced by zeaxanthin.
    Author: Wentworth M, Ruban AV, Horton P.
    Journal: FEBS Lett; 2000 Apr 07; 471(1):71-4. PubMed ID: 10760515.
    Abstract:
    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 new 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.
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