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- W2024081305 abstract "Exposure of detergent-isolated preparations of the Photosystem II complex to 2 M NaCl releases water-soluble 17 and 23 kDa polypeptides; the inhibited rate of oxygen evolution activity is stimulated by addition of Ca2+ [(1984) FEBS Lett. 167, 127–130]. Reactivation of oxygen evolution activity by Ca2+ requires the presence of the ion in high (mM) non-physiological concentrations. Using a new dialysis-reconstitution procedure we have shown that rebinding of the 17 and 23 kDa polypeptides restores oxygen evolution activity only when the system has not been pretreated with EGTA. Removal of loosely-bound Ca2+ from the salt-extracted PS II complex and from the polypeptide solution, by dialysis against EGTA, blocks reconstitution of oxygen evolution activity even though the two polypeptides do rebind; restoration of Ca2+ to EGTA-treated systems, after rebinding of the 17 and 23 kDa polypeptides, results in a strong reconstitution of oxygen evolution activity. The effect of rebound 17 and 23 kDa polypeptides is to promote high affinity binding of Ca2+ to the reconstituted membrane." @default.
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- W2024081305 date "1984-05-07" @default.
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- W2024081305 title "Water-soluble 17 and 23 kDa polypeptides restore oxygen evolution activity by creating a high-affinity binding site for Ca<sup>2+</sup> on the oxidizing side of Photosystem II" @default.
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- W2024081305 doi "https://doi.org/10.1016/0014-5793(84)81393-9" @default.
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