Abstract
The function of the Mg-dependent ATPase of Hevea tonoplast in active proton transport was investigated by using a purified tonoplast fraction containing tightly sealed vesicles. In the used experimental conditions, the uptake of [14C]triphenylmethyl-phosphonium ion ([14C]TPMP+) and [3H]tetraphenyl-phosphonium ion ([3H]TPP+) by the vesicles indicated a transmembrane potential difference, negative inside. In parallel, the uptake of [14C]methylamine into the vesicles monitored a transmembrane pH gradient, interior acid. The addition of 5 mM Mg-ATP markedly depolarized the membrane and increased the magnitude of trnasmembrane pH gradient. These ATP-driven events were substrate specific for Mg-ATP. They were strongly inhibited by ATPase inhibitors such as N, N′-dicyclohexylcar-bodiimide. They were completely eliminated by proton conductors such as carbonylcyanide-p-trifluoromethoxy-phenylhydrazone and 5-chloro-3-tert-butyl-2′-chloro-4-nitro-salicylanilide. They depended on the pH of the medium, the maximum being reached at about pH 7.0. These data provide in vitro evidence that the Mg-ATPase localized at tonoplast level is an electrogenic pump. They are consistent with the hypothesis that an electrogenic H+ pump is catalyzed by the tonoplast ATPase of higher plants.
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Abbreviations
- ΔpH:
-
transmembrane pH gradient
- Δψ:
-
electrical potential difference across membrane
- DCCD:
-
N, N′-dicyclohexyl-carbodiimide
- FCCP:
-
carbonyl-cyanide-p-trifluoromethoxy-phenylhydrazone
- clone PB 86:
-
clone Prang Besar 86
- S-13:
-
5-chloro-3-tert-butyl-2′-chloro-4-nitro-salicylanilide
- TPMP+ :
-
triphenyl-methyl-phosphonium ion
- TPP+ :
-
tetraphenylphosphonium ion
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Marin, B. Evidence for an electrogenic adenosine-triphosphatase in Hevea tonoplast vesicles. Planta 157, 324–330 (1983). https://doi.org/10.1007/BF00397403
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DOI: https://doi.org/10.1007/BF00397403