Add time:08/09/2019         Source:sciencedirect.com

Chlorophyll fluorescence excitation and emission spectroscopy, electron absorption spectroscopy and resonance Raman spectrometry of light-harvesting pigment-protein complex of Photosystem II (LHC II), isolated and incorporated to liposomes, indicate that a carotenoid pigment violaxanthin is present in this complex in conformation 15, 15′-cis. Light-induced cis-trans-isomerization of violaxanthin is combined with an energetic uncoupling of this antenna pigment from chlorophyll and is interpreted in terms of detachment of this carotenoid from protein — the process of making violaxanthin available for de-epoxidation within the lipid phase of the thylakoid membrane. It is also demonstrated that the process of heat-induced detachment of violaxanthin from LHC II is not combined with a cis-trans- isomerization.

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