Journal
SCIENCE
Volume 320, Issue 5877, Pages 794-797Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1154800
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Funding
- National Research Foundation of Korea [2006-214-C00037] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Energy- dependent quenching of excess absorbed light energy ( qE) is a vital mechanism for regulating photosynthetic light harvesting in higher plants. All of the physiological characteristics of qE have been positively correlated with charge transfer between coupled chlorophyll and zeaxanthin molecules in the light- harvesting antenna of photosystem II ( PSII). We found evidence for charge- transfer quenching in all three of the individual minor antenna complexes of PSII ( CP29, CP26, and CP24), and we conclude that charge- transfer quenching in CP29 involves a delocalized state of an excitonically coupled chlorophyll dimer. We propose that reversible conformational changes in CP29 can tune the electronic coupling between the chlorophylls in this dimer, thereby modulating the energy of the chlorophyll-zeaxanthin charge- transfer state and switching on and off the charge- transfer quenching during qE.
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