Excitation wavelength dependence of primary charge separation in reaction centers from Rhodobacter sphaeroides |
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Authors: | Wang Haiyu Lin Su Woodbury Neal W |
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Institution: | Biodesign Institute at Arizona State University and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-5201, USA. |
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Abstract: | The excitation wavelength dependence of the initial electron transfer rate in both wild type and mutant reaction centers from Rhodobacter sphaeroides has been studied between 840 and 920 nm as a function of temperature (10-295 K). The dynamics of primary charge separation show no resolvable excitation wavelength dependence at room temperature over this spectral range. A small variation in rate with excitation wavelength is observed at cryogenic temperatures. The low temperature results cannot be explained in terms either of a nonequilibrium model that assumes that the primary charge separation starts from a vibrationally hot state or a model that assumes a static inhomogeneous distribution of electron transfer driving forces. Instead these results are consistent with the concept that primary charge separation kinetics are controlled by the dynamics of protein conformational diffusion. |
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