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- W2023587584 abstract "(1) Treatment of oxygen-evolving Photosystem II membrane fragments (PS II membranes) with a zero-length crosslinker, l-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) led to immobilization of all the extrinsic 33 kDa protein molecules without any significant effects on the oxygen-evolving activity and oscillation patterns of flash-induced oxygen evolution and thermoluminescence B band. (2) With increasing concentration of EDC, the chlorophyll-binding 47 kDa protein decreased in parallel with the 33 kDa protein, yielding a crosslinked product consisting of one each of the two proteins. The results, which indicate that the two proteins are present in equimolar amounts in PS II membranes, are consistent with the stoichiometry of one copy of the 33 kDa protein per PS II unit. (3) The total immobilization of the 33 kDa protein stabilized 40 to 60% of the oxygen-evolving activity against urea/NaCl−, CaCl2− and MgCl2-wash, which otherwise solubilize the three extrinsic proteins and strongly inactivate oxygen evolution. The result implies that extraction of the extrinsic proteins may not be the sole cause of the inactivation of oxygen evolution by these treatments. (4) The crosslinking of the 33 kDa protein with EDC had no protecting effect against Tris-, NH2OH- and pH 9.0-treatments. However, the stability of oxygen evolution at alkaline pH levels was slightly but significantly increased by treatment of PS II membranes with dithiobis(suc-cinimidylpropionate), which specifically modifies amino groups." @default.
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- W2023587584 date "1991-10-01" @default.
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- W2023587584 title "Total immobilization of the extrinsic 33 kDa protein in spinach Photosystem II membrane preparations. Protein stoichiometry and stabilization of oxygen evolution" @default.
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- W2023587584 doi "https://doi.org/10.1016/s0005-2728(09)91010-6" @default.
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