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• W2059654966 abstract "Bacterial photosynthetic reaction centers from Rhodopseudomonas sphaeroides have been spread on an air/aqueous interface, compressed, and transferred quantitatively to either glass or transparent, tin oxide-coated slides. These assemblies permit the concomitant measurement of both optical and electrical activities to be made on protein films under voltage-clamp conditions. Optical spectra of the monolayer-coated slides reveal characteristic reaction center absorptions. Linear dichroism spectra of the monolayers indicate that the reaction center is aligned on the air/aqueous interface with an angle of inclination which is essentially the same as it is with respect to the membrane plane in vivo. The kinetics of the light-induced absorbance changes of the reaction center in the deposited films are essentially unaltered from those in solution; however, there is some loss in the extent of photochemical activity. Measurement of the light-induced electrical transients shows capacitative charging and discharging currents, which can be readily associated with the reaction center bacteriochlorophyll dimer to ubiquinone electron transfer. The extent of the photochemical activity detected by the voltage-clamp is at best only 10–12% of that measured by optical assay. This suggests that on the air/aqueous interface, the reaction centers must be predominately oriented with opposing directions of electron transfer, having only a slight, variable tendency to align with the ubiquinone directed toward the aqueous phase. In spite of the present shortcomings, these assemblies appear to be uniquely useful to study the effect of clamped potentials on the kinetics and mechanisms of electron transfer." @default.
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• W2059654966 date "1982-08-01" @default.
• W2059654966 modified "2023-10-14" @default.
• W2059654966 title "Spectrophotometric and voltage clamp characterization of monolayers of bacterial photosynthetic reaction centers" @default.
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• W2059654966 doi "https://doi.org/10.1016/0005-2728(82)90022-6" @default.
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