Rat liver Golgi vesicles were isolated by differential and density gradient centrifugation. A fraction enriched in galactosyl transferase and depleted in plasma membrane, mitochondrial, endoplasmic reticulum, and lysosomal markers was found to contain an ATP-dependent H+ pump. This proton pump was not inhibited by oligomycin but was sensitive to N-ethyl maleimide, which distinguishes it from the F0-F1 ATPase of mitochondria. GTP did not induce transport, unlike the lysosomal H+ pump. The pump was not dependent on the presence of potassium nor was it inhibited by vanadate, two of the characteristics of the gastric H+ ATPase. Addition of ATP generated a membrane potential that drove chloride uptake into the vesicles, suggesting that Golgi membranes contain a chloride conductance in parallel to an electrogenic proton pump. These results demonstrate that Golgi vesicles can form a pH difference and a membrane potential through the action of an electrogenic proton translocating ATPase.
Article| October 01 1983
Golgi membranes contain an electrogenic H+ pump in parallel to a chloride conductance.
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J Cell Biol (1983) 97 (4): 1303–1308.
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J Glickman, K Croen, S Kelly, Q Al-Awqati; Golgi membranes contain an electrogenic H+ pump in parallel to a chloride conductance.. J Cell Biol 1 October 1983; 97 (4): 1303–1308. doi: https://doi.org/10.1083/jcb.97.4.1303
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