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- W2056017309 abstract "The effects of zwitterionic detergents on the spectroscopic properties of the primary electron donor P of photosynthetic reaction centers (RCs) from the purple nonsulfur bacterium Rhodobacter sphaeroides are investigated. When RCs are solubilized with N-(n-alkyl)-N,N-dimethyl-3-ammonio-1-propanesulfonates (sulfobetaines) the maximum of the characteristic near-infrared absorption of P, λmax, is shifted to lower wavelengths at room temperature as compared with nonionic detergents. While the range of the blueshift (λmax = 850 – 862 nm) is identical for different sulfobetaines, the dependence of the shift on the detergent/RC ratio varies systematically with the number of carbon atoms in the n-alkyl-chain. N-lauryl-N,N-dimethyl-amine-N-oxide (LDAO), a zwitterionic detergent with a less polar head group, is only able to induce blueshifts of λmax down to 859 nm at much higher detergent/RC ratios. ENDOR experiments performed on the primary donor radical cation P+• reveal that two distinct states of P exist in such samples. Thus the optical bandshifts are caused by transitions between two spectroscopic species, called P866 and P850. We interpret the detergent effect as an electrostatic influence of the detergent head groups on the equilibrium between two protein conformations which in turn affect the structure of the primary donor." @default.
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- W2056017309 date "1996-12-01" @default.
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- W2056017309 title "Effects of zwitterionic detergents on the primary donor of bacterial reaction centers" @default.
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- W2056017309 doi "https://doi.org/10.1002/bbpc.19961001208" @default.
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