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- W2091238876 abstract "A Fourier transform infrared (FTIR) difference spectrum of the oxygen-evolving Mn cluster upon the S(1)-to-S(2) transition was obtained with Ca(2+)-depleted photosystem II (PSII) membranes to investigate the structural relevance of Ca(2+) to the Mn cluster. Previously, Noguchi et al. [Biochim. Biophys. Acta 1228 (1995) 189] observed drastic changes in the carboxylate stretching region of the S(2)/S(1) FTIR spectrum upon Ca(2+) depletion, whereas Kimura and co-workers [Biochemistry 40 (2001) 14061; ibid. 41 (2002) 5844] later claimed that these changes were not ascribed to Ca(2+) depletion itself but caused by the interaction of EDTA to the Mn cluster and/or binding of K(+) at the Ca(2+) site. In the present study, the preparation of the Ca(2+)-depleted PSII sample and its FTIR measurement were performed in the absence of EDTA and K(+). The obtained S(2)/S(1) spectrum exhibited the loss of carboxylate bands at 1587/1562 and 1364/1403 cm(-1) and diminished amide I intensities, which were identical to the previous observations in the presence of EDTA and K(+). This result indicates that the drastic FTIR changes are a pure effect of Ca(2+) depletion, and provides solid evidence for the general view that Ca(2+) is strongly coupled with the Mn cluster." @default.
- W2091238876 created "2016-06-24" @default.
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- W2091238876 date "2007-06-01" @default.
- W2091238876 modified "2023-09-28" @default.
- W2091238876 title "Drastic changes in the ligand structure of the oxygen-evolving Mn cluster upon Ca2+ depletion as revealed by FTIR difference spectroscopy" @default.
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- W2091238876 doi "https://doi.org/10.1016/j.bbabio.2006.11.002" @default.
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