Proton Motive Force
Living reference work entry
Proton motive force (PMF) is the force that promotes the movement of protons across membranes downhill the electrochemical potential.
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). This is measured in terms of the potential energy resulting from the difference in concentration between the two compartments. With a charged solute, the potential has two components: the chemical (concentration) and the electrical potentials (Fig. 1); thus, it is named electrochemical potential.
KeywordsATP synthase LUCA Proton gradient Sodium motive force
References and Further Reading
- Harris DA (1995) Bioenergetics at a glance: an illustrated introduction. Wiley-Blackwell, OxfordGoogle Scholar
- Lane N, Allen JF, Martin W (2010) How did LUCA make a living? Chemiosmosis in the origin of life. Bioessays. doi:10.1002/bies.200900131Google Scholar
- Nicholls DG, Ferguson SJ (2002) Bioenergetics 3. Academic, LondonGoogle Scholar
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