Результаты поиска по 'Rhodobacter sphaeroides':
Найдено статей: 2
  1. Krasilnikov P.M.
    Role of hydrogen bonds in molecular relaxation during electron transport processes in biological systems
    Computer Research and Modeling, 2009, v. 1, no. 3, pp. 297-320

    In molecular systems with hydrogen bonds the mechanism of proton relaxation can take place. It is caused by redistribution of protons between two steady positions in double walls potential along the line of the hydrogen bond. This redistribution occurs at change of parameters of the double walls potential of the hydrogen bond which is caused by change of an electronic state of molecular system. The relaxation process is carried out due to a tunnel transfer of protons along the line of bonds. It is shown, that relaxation process can define temperature dependence of power parameters (either of the free energy differences ΔG or of the reorganization energy λ) of charge recombination P+Q-A from RC of Rhodobacter sphaeroides.

    Keywords: hydrogen bonds, electron transport, proton relaxation.
    Views (last year): 6. Citations: 3 (RSCI).
  2. Mamonov P.A., Krasilnikov P.M., Knox P.P., Rubin A.B.
    Modelling of conformational change within photosynthetic reaction center of Rb. sphaeroides bacteria
    Computer Research and Modeling, 2009, v. 1, no. 4, pp. 437-448

    A possible conformational change, which accompanies electron tranport in Rb. sphaeroides photosynthetic reaction center (RC), was studied using quantum-chemical approach. A kinetic model which takes into account two conformational states of RC is proposed. The model quantitatively describes experimental temperature dependencies of recombination reaction rate P+QA- → PQA. Quantum-chemical modeling of primary quinone (QA) binding site permits one to propose a minor shift of QA as a conformational change of interest. The shift is accompanied by break of a hydrogen bond between 4–C=O group of QA and histidine M219, and formation of a new hydrogen bond between QA and hydroxyl group of threonine M222. Characteristics of this conformational change were obtained from quantum-chemical calculations and match parameters of kinetic model in qualitative fashion.

    Keywords: Rhodobacter sphaeroides, photosynthetic reaction center, conformational change, reaction of recombination.
    Views (last year): 2.

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