PROTON MOTIVE FORCE Meaning and
Definition
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Proton Motive Force (PMF) refers to the electrochemical gradient of protons across a biological membrane. It is a fundamental concept in bioenergetics and refers to the factor that drives the movement of protons across a membrane, usually into the interior of a cell or an organelle.
The PMF is comprised of two components: the electrical potential difference (Δψ) and the pH gradient (ΔpH). The electrical potential difference arises from the separation of positive and negative charges across the membrane, with the interior having a more negative charge than the exterior. The pH gradient, on the other hand, is the difference in proton concentration (H+) across the membrane, with the exterior usually having a more acidic pH than the interior.
The PMF plays a critical role in a variety of biological processes, particularly in energy conversion and transport. It serves as the driving force for ATP synthesis during oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts. Additionally, it facilitates the transport of ions, metabolites, and other molecules across biological membranes via proton pumps and antiporters.
In summary, the proton motive force is the electrochemical gradient of protons across a biological membrane that serves as the primary driving force for ATP synthesis and various transport processes in cells and organelles.
Common Misspellings for PROTON MOTIVE FORCE
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