A membrane transport system that uses an energy source to move protons against their electrochemical gradient.
An ATP-driven proton pump that acidifies many eukaryotic endomembrane compartments.
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A proton pump is a type of protein found in the membranes of cells that plays a crucial role in transporting protons (H⁺ ions) across that membrane. Proton pumps are essential for various cellular processes, including: 1. **Maintaining pH**: By controlling the concentration of hydrogen ions, proton pumps help maintain the acidity or alkalinity of different cellular compartments and the extracellular environment.