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The functional organization of the acceptor site of the electron transport chain in the reaction centers of photosynthesizing bacteria rhodopseudomonas sphaeroides

, : The functional organization of the acceptor site of the electron transport chain in the reaction centers of photosynthesizing bacteria rhodopseudomonas sphaeroides. Biologicheskie Nauki (Moscow) (7): 44-51

The role of quinones in the photosynthetic transport of electrons was studied in intact chromatophores and in reaction centers isolated from R. sphaeroides chromatophores. The photo-induced absorption variations were recorded on a single-beam spectrophotometer. Mathematical modeling was used to study the functional organization of the acceptor site of the electron-transport [ET] chain in chromatophores. The nature of the interaction between individual ET centers on the level of secondary acceptors and the number of involved molecules were elucidated. Two ET schemes were proposed. A kinetic analysis of the mathematical models showed that 1 molecule of secondary quinone was able to accept electrons from primary acceptors belonging to the 2 pigment-protein complexes of the reaction center.

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