Exciton quenching by oxidized chlorophyll Z across the two adjacent monomers in a photosystem II core dimer

Mohamed, Ahmed A.; Nishi, Seiki; Kawakami, Keisuke; Shen, Jian‐Ren; Itoh, Shigeru; Fukumura, Hiroshi; Shibata, Yutaka

doi:10.1007/s11120-022-00948-1

Photosynth Res

2022

DOI: 10.1007/s11120-022-00948-1

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Exciton quenching by oxidized chlorophyll Z across the two adjacent monomers in a photosystem II core dimer

Ahmed A. Mohamed

Seiki Nishi

Keisuke Kawakami

et al.

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2024

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Reinvestigation on primary processes of PSII-dimer from Thermosynechococcus vulcanus by femtosecond pump-probe spectroscopy

Kosumi,

Bandou-Uotani,

Kato

et al. 2024

Photosynth Res

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Cyanobacterial photosynthetic apparatus e ciently capture sunlight, and the energy is subsequently transferred to photosystem I (PSI) and II (PSII), to produce electrochemical potentials. PSII is a unique membrane protein complex that photo-catalyzes oxidation of water and majorly contains photosynthetic pigments of chlorophyll a and carotenoids. In the present study, the ultrafast energy transfer and charge separation dynamics of PSII from a thermophilic cyanobacteria Thermosynechococcus vulcanus have been investigated by femtosecond pump-probe spectroscopic measurements. The results demonstrated that the pheophytin anion Pheo D1 − generates with 43.0 ps at 140 K (14.8 ps at 296 K) and the secondary electron transfer to quinone: Pheo D1 − Q A →Pheo D1 Q A − occurs with 650 ps at 296 K upon excitation into the Q y band of chlorophyll a at 670 nm. On the other hand, an ine cient β-carotene → chlorophyll a energy transfer (33%) occurred after excitation to the S 2 state of β-carotene at 500 nm. Instead, the carotenoid triplet state appeared in an ultrafast timescale after excitation at 500 nm.

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Reinvestigation on primary processes of PSII-dimer from Thermosynechococcus vulcanus by femtosecond pump-probe spectroscopy

Kosumi,

Bandou-Uotani,

Kato

et al. 2024

Photosynth Res

Self Cite

View full text Add to dashboard Cite

show abstract

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Exciton quenching by oxidized chlorophyll Z across the two adjacent monomers in a photosystem II core dimer

Cited by 1 publication

References 49 publications

Reinvestigation on primary processes of PSII-dimer from Thermosynechococcus vulcanus by femtosecond pump-probe spectroscopy

Reinvestigation on primary processes of PSII-dimer from Thermosynechococcus vulcanus by femtosecond pump-probe spectroscopy

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