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- W2092079912 abstract "The Mn cluster of Photosystem II (PSII) from Synechococcus elongatus was studied using EPR. A signal with features between g = 5 and g = 9 is reported from the S2-state. The signal is attributed to the manganese cluster in a state with a spin 5/2 state. Spectral simulations of the signal indicate zero field splitting parameters where the |E/D| was 0.13. The new signal is formed by irradiating PSII samples which contain the spin = 1/2 S2-state using 813 nm light below 200 K. This effect is attributed to a spin-state change in the manganese cluster due to absorption of the IR light by the Mn-cluster itself. The signal is similar to that reported recently in PSII of plants [Boussac, A., Un, S., Horner, O., and Rutherford, A. W. (1998) Biochemistry 37, 4001-4007]. In plant PSII the comparable signal is formed at a lower temperature (optimally below 77 K), and gradual warming of the sample in the dark leads to the formation of the state responsible for the well-known g = 4.1 signal prior to formation of the spin 1/2 multiline signal. In the present work using cyanobacterial PSII, warming of the sample in the dark leads to the formation of the spin 1/2 multiline signal without formation of the g = 4 type signal as an intermediate. These observations provide a partial explanation for the long-standing mystery of the missing g = 4 state in cyanobacterial PSII. The observations are rationalized in terms of three possible states which can exist for S2: (i) the spin 1/2 multiline signal, (ii) the state responsible for the g = 4.1 signal, and (iii) the new spin 5/2 state. The relative stability of these states differs between plants and cyanobacteria." @default.
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- W2092079912 date "1998-06-01" @default.
- W2092079912 modified "2023-10-18" @default.
- W2092079912 title "Effect of Near-Infrared Light on the S<sub>2</sub>-State of the Manganese Complex of Photosystem II from <i>Synechococcus elongatus</i>" @default.
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- W2092079912 doi "https://doi.org/10.1021/bi980195b" @default.
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