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  • Title: [Conformational mobility and functional activity of photosynthetic reaction centers of Rhodopseudomonas sphaeroides].
    Author: Berg AI, Noks PP, Kononenko AA, Frolov EN, Uspenskaia NIa.
    Journal: Mol Biol (Mosk); 1979; 13(2):469-77. PubMed ID: 220525.
    Abstract:
    In pigment-protein complexes of photosynthetic reaction centres (RC's), extracted from chromatophore membranes of Rps. sphaeroides with sodium dodecylsulphate, functional activity and intramolecular mobility were studied as a function of temperature and hydration by use of the technique of optical absorbance and ESR spectroscopy. Over the studied temperature range from +20 to -120 degrees C and at a relative humidity (P/Ps) from 0.9 to 0.1, there observed a close interrelationship between reversible kinetic changes of direct and backward redox-reactions of the photo-reduced endogeneous acceptor of quinone nature and the effective parameter of the correlation time of the rotational diffusion of the hydrophobic spin probe as well as of spin labels chemically bound to SH- and COOH-groups of amino acid residues of the RC's protein. The findings support the view that the conformational dynamics in the RC controls the effectiveness of the primary processes of stabilization of photochemically separated charges.
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