AI Article Synopsis
- Resonance Raman analysis shows that violaxanthin, a xanthophyll in the LHCII photosynthetic complex, undergoes a light-induced molecular change when immobilized in a polyacrylamide gel.
- This change involves a twisting motion and a shift between trans and cis configurations in the carotenoid's polyene chain, primarily observed in the trimeric structure of the complex.
- The study discusses the potential significance of this transformation for making violaxanthin available for enzymatic conversion in the xanthophyll cycle, suggesting a physiological role in photosynthesis.
Article Abstract
Resonance Raman analysis of the photosynthetic complex LHCII, immobilized in a polyacrylamide gel, reveals that one of the protein-bound xanthophylls, assigned as violaxanthin, undergoes light-induced molecular reconfiguration. The phototransformation is selectively observed in a trimeric structure of the complex and is associated with a pronounced twisting and a trans-cis molecular configuration change of the polyene chain of the carotenoid. Among several spectral effects accompanying the reconfiguration there are ones indicating a carotenoid triplet state. Possible physiological importance of the light-induced violaxanthin reconfiguration as a mechanism associated with making the pigment available for enzymatic deepoxidation in the xanthophyll cycle is discussed.
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| http://dx.doi.org/10.1021/acs.jpcb.6b01641 | DOI Listing |
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