The effects of mono- and divalent salts on the O2-evolution activity and low temperature multiline EPR spectrum of Photosystem II preparations from spinach |
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| Authors: | Neil V. Blough Kenneth Sauer |
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| Affiliation: | Department of Chemistry and Laboratory of Chemical Biodynamics, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720 USA |
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| Abstract: | The ability of salts to inhibit the O2-evolution activity of PS II preparations is shown to parallel closely the Hofmeister series, suggesting that inhibition is related to the solubility of the 16, 24 and 33 kDa proteins in these salt solutions. An examination of the effect of salt inactivation on the low temperature multiline EPR signal indicates that the release of either the 16 and 24 kDa proteins, or additionally the 33 kDa protein blocks or greatly reduces the efficiency of the advancement of the water-splitting complex to the S2-state; under some conditions, this inhibition is reversible. |
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| Keywords: | Oxygen evolution ESR Salt effect Photosystem II (Spinach chloroplast) Chl chlorophyll PS II Photosystem II Mes 4-morpholineethanesulfonic acid |
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