Abstract

Treatment with 2.6 M urea of the Photosystem II particles depleted of two polypeptides of 24 kDa and 18 kDa completely released a polypeptide of 33 kDa and eliminated the oxygen-evolution activity. The 33-kDa polypeptide rebound to the urea-treated particles and partially reactivated the oxygen evolution. A quantitative analysis of the rebinding suggests tha there is a specific binding site for the 33-kDa polypeptide on the membrane surface.

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