Introduction of protonic potential of Brønsted−Lowry acids and bases to the quantification of the energy of proton translocation and elucidation of oxidative phosphorylation

Wang, Yaotian; Wang, Jianguo; Pang, Junjie; Zhang, Lijuan; Xu, Weiwei; Shao, Cuimin

doi:10.1016/j.jelechem.2020.113909

Cited by 1 publication

(1 citation statement)

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“…The iso protic potential of proton occurs in the buffer solution because PT is extremely rapid 23 in aqueous solution. The pH value of solution indicates the apparent protic potential (P) 24 of the intermolecular and intramolecular proton acceptor. The center of the optimum pH range for a buffer occurs at the point where there are equal concentrations of the acid and conjugate base.…”

Section: ⎡ ⎣ ⎤ ⎦mentioning

confidence: 99%

The Principle for Proton Motive Force Generated by Quinones Oxidoreduction

Wang,

Liu,

Lin

et al. 2024

J. Electrochem. Soc.

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The proton motive force across the inner mitochondrial membrane drives adenosine triphosphate synthesis. Q-cycle is a mechanism of the proton motive force generation. Its essential feature is a bifurcation and forming semiquinone, which remains contentious. Three cathodic waves of benzoquinone appeared in dilute phosphate buffered solution (pH 3.35), which was attributed to dramatic pH change at electrode surface. These waves indicated that at different potential of the electrode, benzoquinone accepted the protons from H3O+, H2PO4 −, and H2O, and produced H2O, HPO4 2−, and OH−, respectively. It revealed that the pKa of hydroquinone was dependent on the potential of the electrode and external oxidant, which was attributed to the nature of proton-coupled electron transfer of quinone oxidoreduction. We proposed a mechanism that the proton motive force was directly produced by the reductant at Qi site and the oxidant at Qo site through quinone oxidoreduction.

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Section: ⎡ ⎣ ⎤ ⎦mentioning

confidence: 99%