[Electron structure of plastoquinone and coupling of electron and proton transport in thylakoids of the higher plants].
The energy dependence on hydrogen position for a system, consisting of plastoquinone (in different redox states) and histidine molecules was studied. The distance between the atoms forming the hydrogen bond, an oxygen of the quinone molecule and a nitrogen of histidine, was supposed to be fixed. It was shown that for neutral quinone the total energy is minimal when the hydrogen is bound to histidine; for reduced quinone, the probability of hydrogen binding to quinone and histidine is approximately equal (so that a hydrogen bond is formed) and on secondary reduction of plastoquinone, the hydrogen binds to it.
S V
SV
Poltev
A A
AA
Belov
S A
SA
Kuznetsova
A K
AK
Kukushkin
D004579:Electron Transport; D006860:Hydrogen Bonding; D017136:Ion Transport; D008954:Models, Biological; D008958:Models, Molecular; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D010944:Plants / Q000378:metabolism* / Q000648:ultrastructure; D010971:Plastoquinone / Q000737:chemistry* / Q000378:metabolism; D011522:Protons; D013816:Thermodynamics; D020524:Thylakoids / Q000378:metabolism*
D011522:Protons; D010971:Plastoquinone