Deuterium substitution effect on the excited-state dynamics of rhodopsin

Article Abstract:

Research was conducted to examine the excited-state dynamics of the cis-trans photoisomerization of rhodopsin by investigating the deuterium substitution effects for hydrogen atoms bonded to C11 and C12 of the retinal chromophore by the method of Fourier transform of optical absorption spectra. Results indicate that the concerted motions of hydrogen out-of-plane waggings at C11 and C12, which are found to exist in native rhodopsin in the time range 20-60- fs, have no effect on the excited dynamics in its time range.

Hydrogen bonding, Hydrogen bonds, Rhodopsin, Deuterium, Substitution reactions

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Theory of excitation transfer in the intermediate coupling case

Article Abstract:

An excitation energy transfer theory (EET) in the intermediate coupling case is discussed. An existing triad electron transfer theory is used to express the overall rate for the intermediate coupling EET. Coupling involves concurrent superexchange processes and sequential mechanisms. A new approach for evaluating the degree of sequentiality based on the fraction of density flow passing through the intermediate state is also developed.

Models

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Theoretical analysis of the energy gap dependence of the reconstituted B800 - -> B850 excitation energy transfer rate in bacterial LH2 complexes

Article Abstract:

The experimental data of the energy gap dependence in the excitation energy transfer (EET) time of reconstituted B800 - -> B850 was reproduced by calculations, using GME theory with the memory function obtained by the second-order perturbation method. According to the results, the rate-limiting step of this EET is a transition process from the localized state of B800 to the nearby BChla molecules with site energy of 810 nm in B850.

Science & research, Methods, Analysis, Transition state (Chemistry)

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