NDLI: Coherent phenomena of charge separation in reaction centers of LL131H and LL131H/LM160H/FM197H mutants of Rhodobacter sphaeroides

Content Provider	Springer Nature Link
Author	Yakovlev, A. G. Vasilieva, L. G. Shkuropatov, A. Y. Shuvalov, V. A.
Copyright Year	2011
Abstract	Primary stage of charge separation and transfer of charges was studied in reaction centers (RCs) of point mutants LL131H and LL131H/LM160H/FM197H of the purple bacterium Rhodobacter sphaeroides by differential absorption spectroscopy with temporal resolution of 18 fsec at 90 K. Difference absorption spectra measured at 0–4 psec delays after excitation of dimer P at 870 nm with 30 fsec step were obtained in the spectral range of 935–1060 nm. It was found that a decay of P* due to charge separation is considerably slower in the mutant RCs in comparison with native RCs of Rba. sphaeroides. Coherent oscillations were found in the kinetics of stimulated emission of the P* state at 940 nm. Fourier analysis of the oscillations revealed a set of characteristic bands in the frequency range of 20–500 cm−1. The most intense band has the frequency of −30 cm−1 in RCs of mutant LL131H and in native RCs and the frequency of ∼100 cm−1 in RCs of the triple mutant. It was found that an absorption band of bacteriochlorophyll anion B A − which is registered in the difference absorption spectra of native RCs at 1020 nm is absent in the analogous spectra of the mutants. The results are analyzed in terms of the participation of the BA molecule in the primary electron transfer in the presence of a nuclear wave packet moving along the inharmonic surface of P* potential energy.
Starting Page	1107
Ending Page	1119
Page Count	13
File Format	PDF
ISSN	00062979
Journal	Biochemistry (Moscow)
Volume Number	76
Issue Number	10
e-ISSN	16083040
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-10-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	photosynthesis charge separation reaction center wave packet electron transfer Biomedicine general Microbiology Biochemistry Bioorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Biophysics Geriatrics and Gerontology

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