Maria M. Leonova

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To explore the influence of the I(L177)H single mutation on the properties of the nearest bacteriochlorophylls (BChls), three reaction centers (RCs) bearing double mutations were constructed in the photosynthetic purple bacterium Rhodobacter sphaeroides, and their properties and pigment content were compared with those of the correspondent single mutant(More)
During photosynthesis light energy is converted into energy of chemical bonds through a series of electron and proton transfer reactions. Over the first ultrafast steps of photosynthesis that take place in the reaction center (RC) the quantum efficiency of the light energy transduction is nearly 100%. Compared to the plant and cyanobacterial photosystems,(More)
Mutant reaction centers (RC) from Rhodobacter sphaeroides have been studied in which histidine L153, the axial ligand of the central Mg atom of bacteriochlorophyll BA molecule, was substituted by cysteine, methionine, tyrosine, or leucine. None of the mutations resulted in conversion of the bacteriochlorophyll BA to a bacteriopheophytin molecule. Isolated(More)
Primary charge separation dynamics in four mutant reaction centers (RCs) of the purple bacterium Rhodobacter sphaeroides with increased midpoint potential of the primary electron donor P (M160LH, L131LH, M197FH, and M160LH + L131LH + M197FH) have been studied by femtosecond transient absorption spectroscopy at room temperature. The decay of the excited(More)
The purpose of the review is to show that the tetrameric (bacterio)chlorophyll ((B)Chl) structures in reaction centers of photosystem II (PSII) of green plants and in bacterial reaction centers (BRCs) are similar and play a key role in the primary charge separation. The Stark effect measurements on PSII reaction centers have revealed an increased dipole(More)
319 The light energy is transformed into the energy of charge-separated state in the photosynthetic reaction centers (RC). The bacterial RC are pigment–protein complexes comprising three units (L, M, and H) and 10 cofactors, which form two transmembrane electron transport chains, active ( A ) and inactive ( B ): dimer of bacteriochlorophyll, BChl (P); two(More)
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