Protective dissipation of excess absorbed energy by photosynthetic apparatus of cyanobacteria: role of antenna terminal emitters
作者： Navassard V. Karapetyan
DOI: 10.1007/S11120-008-9336-8
关键词: Fluorescence 、 Photochemistry 、 Triplet state 、 Phycobilisome 、 Acceptor 、 Photosystem I 、 P700 、 Dissipation 、 Chemistry 、 Photosynthesis
摘要: Two mechanisms of photoprotective dissipation the excessively absorbed energy by photosynthetic apparatus cyanobacteria are described that divert from reaction centers. Energy dissipation, monitored as nonphotochemical fluorescence quenching, occurs at different steps transfer within phycobilisomes or core antenna photosystem I. Although these differ significantly, in both cases, dissipates mainly terminal emitters: allophycocyanin B membrane linker protein (LCM) phycobilisomes, longest-wavelength chlorophylls I antenna. It is supposed carotenoid-induced triggered light-induced transformation nonquenched state into quenched due to conformation changes caused orange carotinoid-binding (OCP)–phycobilisome interaction. Fluorescence strongly P700 cation radical triplet state, dependent on redox acceptor side cofactors
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