クロロフィル分子の多様性に基づく光合成の光エネルギー変換系の基本原理の解明化(2007年度神奈川大学総合理学研究所共同研究助成論文)

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■原著■ 2007 年度神奈川大学総合理学研究所共同研究助成論文The composition of photosystem II (PSII) in the chlorophyll (Chl) d-dominatedcyanobacterium Acaryochloris marina MBIC 11017 was investigated to enhance the generalunderstanding of the energetics of the PSII reaction center. We first purifiedphotochemically active complexes consisting of a 47 kDa chlorophyll protein (CP47), CP43’(PcbC), D1, D2, cytochrome b559, PsbI, and an unknown small polypeptide. The pigmentcomposition per two pheophytin (Phe) a molecules was 55 ± 7 Chl d, 3.0 ± 0.4 Chl a, 17 ± 3α-carotene, and 1.4 ± 0.2 plastoquinone-9. A special pair was detected by a reversibleabsorption change at 713 nm (P713) together with a cation radical band at 842 nm. FTIRdifference spectra of the specific bands of a 3-formyl group allowed assignment of the specialpair. The combined results indicate that the special pair includes a Chl d homodimer.The primary electron acceptor was shown by photoaccumulation to be Phe a, and itspotential was shifted to a higher value than that in the Chl a/Phe a system. The overallenergetics of PSII in the Chl d system adapt to changes in the redox potentials, with P713as the special pair utilizing lower light energy at 713 nm. Our findings support the ideathat changes in photosynthetic pigments combine with modification of the redox potentialsof electron transfer components to give rise to energy changes in the total reaction system.
神奈川大学の論文

クロロフィル分子の多様性に基づく光合成の光エネルギー変換系の基本原理の解明化(2007年度神奈川大学総合理学研究所共同研究助成論文)

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