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- W2005071831 abstract "Proton matrix ENDOR spectra of tyrosines Z+(Y+Z) and D+(Y+D) were studied in the frozen Tris-treated PS II. ENDOR spectra of the tyrosines in oriented membranes observed at 10 K have shown similar angular dependence with similar line pair separations, suggesting that the local arrangement of protons surrounding both radical species is similar. The angular dependence of EPR spectra showed the C-O bonds in Y+Z and Y+D lie parallel to the membrane normal. With increasing temperature, the intensity of the line pair with 1.2 MHz separation decreased above 25 K for Y+Z, and above 110 K for Y+D, respectively. Assuming a motion of the proton responsible to the line pair, the activation energies for the motional broadening were estimated to be 86 ± 20 J/mol for Y+Z, and 810 ± 200 J/mol for Y+D, respectively. The broadening may be ascribed to small amplitude vibrations of protons surrounding tyrosine radicals. The intensities for the peaks with about 7 MHz separation assigned to the OH proton of the tyrosine decreased, which was ascribed to a similar motional broadening. The difference in temperature dependence of line broadening of the two radicals suggests that the functional difference between them may be ascribable to differences in flexibility in their microenvironment." @default.
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- W2005071831 date "1994-04-01" @default.
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- W2005071831 title "Microenvironments of tyrosine D+ and tyrosine Z+ in Photosystem II studied by proton matrix ENDOR" @default.
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- W2005071831 doi "https://doi.org/10.1016/0005-2728(94)90212-7" @default.
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