Abstract
To study electrogenesis the photosystem I particles from Synechococcus elongatus were incorporated into asolectin liposomes, and fast kinetics of laser flash-induced electric potential difference generation has been measured by a direct electrometric method in proteoliposomes absorbed on a phospholipid-impregnated collodion film. The photoelectric response has been found to involve three electrogenic stages associated with (i) iron-sulfur center Fx reduction by the primary electron donor P700, (ii) electron transfer between iron-sulfur centers Fx and FA/FB, and (iii) reduction of photo-oxidized P700+ by reduced cytochrome C553. The relative magnitudes of phases (ii) and (iii) comprised about 20% of phase (i).
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