Relaxation processes accompanying electron stabilization in the quinone acceptor part of Rb. sphaeroides reaction centers

Knox, P.P.; Lukashev, E.P.; Gorokhov, V.V.; Seifullina, N.K.; Paschenko, V.Z.

Авторы: Knox P.P., Lukashev E.P., Gorokhov V.V., Seifullina N.Kh, Paschenko V.Z.
Журнал: Journal of Photochemistry and Photobiology B: Biology
Том: 189
Год издания: 2018
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 145
Последняя страница: 151
DOI: 10.1016/j.jphotobiol.2018.10.005
Аннотация: The temperature dependence of the dark recombination rate in photooxidizedbacteriochlorophyll (P) and photoreduced quinone acceptors (ubiquinones) QA andQB of photosynthetic reaction centers of purple bacteria Rhodobacter sphaeroides(Rb. sphaeroides) was studied. Photoinduced changes in the absorption weredetected in the Qx absorption band of photooxidized bacteriochlorophyll at 600 nmand in the bands corresponding to the redox changes of ubiquinones at 335 and420-450 nm. Kinetic analysis was used to evaluate the activation energy and thecharacteristic time of the transient process of relaxation accompanying electronstabilization at the final quinone acceptor. A comparative study of the kinetics ofoxidation-reduction reactions of photoactive bacteriochlorophyll RC purplebacteria and quinone acceptors in their individual absorption bands is aninformative approach to studying the mechanisms of this stabilization. The analysisof the revealed kinetic differences makes it possible to estimate the activationenergy and the characteristic times of the transition relaxation processes associatedwith the stabilization of the electron in the quinone acceptor part of RC. Purplebacterial reaction centers have fundamental similarities with PSII reaction centers.Such a similarity represents evolutional closeness between the two types of RC. Soit is possible that the photoinduced charge separation in PSII RC, as well as inpurple bacteria RC, is also accompanied by definite conformational changes. Thepossible role of hydrogen bonds of surrounding protein in the relaxation processesaccompanying the electron transfer to quinone acceptors is discussed.
Добавил в систему: Пащенко Владимир Захарович

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Relaxation processes accompanying electron stabilization in the quinone acceptor part of Rb. sphaeroides reaction centersстатья

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