Hydrolysis of ATP drives proton movement and helps establish an acidic compartment. The resulting electrochemical gradient supports cargo processing and coupled transport; a low luminal pH is actively maintained rather than an intrinsic property of all membrane vesicles. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 3, 6 and 15, protein function, translation and cell signalling
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