Identification of a new excited state responsible for the in vivo unique absorption band of siphonaxanthin in the green alga Codium fragile |
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Authors: | Akimoto Seiji Tomo Tatsuya Naitoh Yukito Otomo Akira Murakami Akio Mimuro Mamoru |
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Affiliation: | Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan. akimoto@hawk.kobe-u.ac.jp |
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Abstract: | A marine green alga, Codium fragile, exhibits a characteristic in vivo absorption band of a specific keto-carotenoid, siphonaxanthin, at 535 nm. We examined the ultrafast fluorescence kinetics by direct excitation of this band after purification of light-harvesting complex II. On the basis of a high fluorescence anisotropy (0.39) up to 1 ps and a very short lifetime (60 fs), we identified the 535 nm band as a new electronically excited state (Sx) located between the S1 and S2 states. Excited-state dynamics of the Sx state were further discussed in relation to the energy transfer processes in the complexes. |
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