A theoretical model for electron and proton coupling at quinone-binding site of photosystem II of higher plants.
In this work we consider the coupling of electron and proton transfer near Q(B) in the reaction center (RC) of photosystem II (PS2). We have carried out the calculations of the energy levels and proton density in the system Q(B)(-) Histidine L190. It is shown that the proton of the histidine forms the H-bond with twice-reduced Q(B)(2-). Based on these calculations, we propose a new explanation of the coupling between the electron and proton transfer.
Belousov
R V
RV
Faculty of Physics, Moscow State University, Leninskie Gory, 119992, Moscow, Russia.
Poltev
S V
SV
Kukushkin
A K
AK
D016227:Benzoquinones / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D001692:Biological Transport / Q000502:physiology; D003198:Computer Simulation; D004579:Electron Transport; D006639:Histidine / Q000737:chemistry* / Q000378:metabolism; D008954:Models, Biological; D008956:Models, Chemical; D010084:Oxidation-Reduction; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000378:metabolism; D010940:Plant Proteins / Q000737:chemistry* / Q000378:metabolism; D011485:Protein Binding; D011522:Protons; D011789:Quantum Theory
D016227:Benzoquinones; D045332:Photosystem II Protein Complex; D010940:Plant Proteins; D011522:Protons; C004532:quinone; D006639:Histidine