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P680 (PD1PD2) and ChlD1 as alternative electron donors in photosystem II core complexes and isolated reaction centers by I.V. Shelaev; F.E. Gostev; M.I. Vishnev; A.Ya. Shkuropatov; V.V. Ptushenko; M.D. Mamedov; O.M. Sarkisov; V.A. Nadtochenko; A.Yu. Semenov; V.A. Shuvalov is a Medicine article available to read on EtoBox.

What is P680 (PD1PD2) and ChlD1 as alternative electron donors in photosystem II core complexes and isolated reaction centers about?

Low temperature (77-90 K) measurements of absorption spectral changes induced by red light illumination in isolated photosystem II (PSII) reaction centers (RCs, D1/D2/Cyt b559 complex) with different external acceptors and in PSII core complexes have shown that two different electron donors can alternatively function in PSII: chlorophyll (Chl) dimer P(680) absorbing at 684 nm and Chl monomer Chl(D1) absorbing at 674 nm. Under physiological conditions (278 K) transient absorption difference spectroscopy with 20-fs resolution was applied to study primary charge separation in spinach PSII core complexes excited at 710 nm. It was shown that the initial electron transfer reaction takes place with a time constant of ~0.9 ps. This kinetics was ascribed to charge separation between P(680)\* and Chl(D1) absorbing at 670 nm accompanied by the formation of the primary charge-separated state P(680)(+)Chl(DI)(-), as indicated by 0.9-ps transient bleaching at 670 nm. The subsequent electron transfer from Chl(D1)(-) occurred within 13-14 ps and was accompanied by relaxation of the 670-nm band, bleaching of the Pheo(D1) Q(x) absorption band at 545 nm, and development of the anion-radical band of P

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Author

I.V. Shelaev; F.E. Gostev; M.I. Vishnev; A.Ya. Shkuropatov; V.V. Ptushenko; M.D. Mamedov; O.M. Sarkisov; V.A. Nadtochenko; A.Yu. Semenov; V.A. Shuvalov

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1011-1344)

Published

2011

Language

EN

Field

Medicine (Physical Sciences)