Reorganization energies of the electron transfer reactions involving quinones in the reaction center of Rhodobacter sphaeroides.
Photosynth Res
; 138(2): 167-175, 2018 Nov.
Article
em En
| MEDLINE
| ID: mdl-30022339
ABSTRACT
In framework of the continuum electrostatics theory, the reorganization energies of the electron transfers QA--QB (fast phase), Bph--QA, P+-QA-, and P+-QB- in the photosynthetic bacterial reaction center have been calculated. The calculations were based on the static dielectric permittivity spatial distribution derived from the data on the electrogenesis, with the corresponding characteristic times relatively close to the reaction times of QA--QB (fast phase) and Bph--QA but much shorter than those times of the latter two recombination reactions. The calculated reorganization energies were reasonably close to the experimental estimates for QA--QB (fast phase) and Bph--QA but substantially lower than those of P+-QA- and P+-QB-. A higher effective dielectric permittivity contributes to this effect, but the dominant contribution is most probably made by a non-dielectric relaxation, especially for the P+-QB- recombination influenced by the proton transfer. This situation calls for reconsidering of the current electron transfer rate estimates.
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Coleções:
01-internacional
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MEDLINE
Assunto principal:
Quinonas
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Rhodobacter sphaeroides
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Complexo de Proteínas do Centro de Reação Fotossintética
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Complexos de Proteínas Captadores de Luz
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Transporte de Elétrons
Idioma:
En
Revista:
Photosynth Res
Ano de publicação:
2018
Tipo de documento:
Article