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. 1986 May;81(1):222–227. doi: 10.1104/pp.81.1.222

Association of H+-Translocating ATPase in the Golgi Membrane System from Suspension-Cultured Cells of Sycamore (Acer pseudoplatanus L.)

Md Showkat Ali 1, Takashi Akazawa 1
PMCID: PMC1075310  PMID: 16664779

Abstract

The Golgi complex and the disrupted vesicular membranes were prepared from suspension-cultured cells of sycamore (Acer pseudoplatanus L.) using protoplasts as the starting material and employing linear sucrose density gradient centrifugation followed by osmolysis (Ali et al. [1985] Plant Cell Physiol 26: 1119-1133). The isolated Golgi fraction was found to be enriched with marker enzyme activities and depleted of the activity of a typical mitochondrial marker enzyme, cytochrome c oxidase. Golgi complex, and vesicular membranes derived thereof were found to contain the specific ATPase (specific activity of about 0.5 to 0.7 micromoles per minute per milligram protein). Inhibitor studies suggested that the ATPase of Golgi was different from plasma membrane, tonoplast and mitochondrial ATPases as it was not inhibited by sodium vanadate, potassium nitrate, oligomycin and sodium azide. The sensitivity to N-ethylmaleimide further distinguished the Golgi ATPase from F0 to F1 ATPase of mitochondria. The internal acidification was measured by monitoring the difference in absorbance at 550 nanometers minus 600 nanometers using neutral red as a probe. The maximum rate detected with Golgi and disrupted membrane system was 0.49 and 0.61 optical density unit per minute per milligram protein, at pH 7.5, respectively, indicating that the proton pump activity was tightly associated with the Golgi membranes. In both cases, the acidification was inhibited 70 to 90% by various ionophores, indicating that the proton pump was electrogenic in nature. Both the Golgi ATPase activity and ATP-dependent acidification were profoundly inhibited by N,N′-dicyclohexylcarbodiimide, which also indicate that the two activities are catalyzed by the same enzyme.

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Selected References

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