Abstract
Extraction of PS II particles with 1 M CaCl2 caused complete disappearance of the light‐induced signal of the possible Kok S2 state of the water‐splitting complex and total loss of the O2, evolving activity, concomitant with perfect removal of the 17‐, 23‐ and 34‐kDa proteins from the particles. The recovery of the multiline signal in the CaCl2‐treated PS II was performed by reinserting the 34‐kDa protein, when CI− was present in the solution for the EPR measurement. However, in the absence of Cl−, besides the 34‐kDa protein, the 17‐ and 23‐kDa proteins were required for the recovery of the signal. These results are compared with the results on the recovery of the O2, evolution in the reconstituted PS II to examine the role of these three proteins on the water splitting.
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