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In most cases the proton-motive force is generated by an electron transport chain which acts as a proton pump, using the Gibbs free energy of redox reactions to pump protons (hydrogen ions) out across the membrane, separating the charge across the membrane. In mitochondria, energy released by the electron transport chain is used to move protons ...
A difference of solute concentration between two compartments separated by a biological membrane generates a tendency to equilibrium, which, in the case of protons, is called proton motive force (PMF).
Mar 26, 2016 · The proton motive force occurs when the cell membrane becomes energized due to electron transport reactions by the electron carriers embedded in it. Basically, this causes the cell to act like a tiny battery. Its energy can either be used right away to do work, like power flagella, or be stored for later in ATP.
The gradient is sometimes called the proton-motive force, and you can think of it as a form of stored energy, kind of like a battery. Like many other ions, protons can't pass directly through the phospholipid bilayer of the membrane because its core is too hydrophobic.
In place of such an intermediate, Mitchell proposed a proton gradient across a membrane: the proton motive force (Mitchell 1961). It works much like a hydroelectric dam.
Oct 18, 2022 · Proton motive force (PMF) is the force that promotes the movement of protons across membranes downhill the electrochemical potential.
Aug 31, 2023 · In an electron transport system, energy from electron transfer during oxidation-reduction reactions enables certain carriers to transport protons (H+) across a membrane. As the H+ concentration increases on one side of the membrane, an electrochemical gradient called proton motive force develops.
Dec 24, 2022 · Describe the role of the proton motive force in respiration Key Points The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, releasing energy in the process as they break high-energy bonds.
In an electron transport system, energy from electron transfer during oxidation-reduction reactions enables certain carriers to transport protons (H+) across a membrane. As the H+ concentration increases on one side of the membrane, an electrochemical gradient called proton motive force develops.
The proton-motive force powers the synthesis of ATP. Heterologous experimental systems confirmed that proton gradients can power ATP synthesis. Coupled nature of respiration in mitochondria. O2 consumed only with ADP, excess Pi. (+) Uncoupler DNP (O. 2 consumed without ADP). Oxidation of substrates is. coupled to the. phosphorylation of ADP.
