The electrochemical proton gradient and its influence on citrate uptake in tonoplast vesicles of Hevea brasiliensis

Planta ◽  
1981 ◽  
Vol 153 (5) ◽  
pp. 486-493 ◽  
Author(s):  
Bernard Marin ◽  
J. Andrew C. Smith ◽  
Ulrich L�ttge
Keyword(s):  
Hevea Brasiliensis ◽  
Proton Gradient ◽  
Electrochemical Proton Gradient

scholarly journals The control by ΔµH+ of the tonoplast-bound H+-translocating adenosine triphosphatase from rubber-tree (Hevea brasiliensis) latex

1985 ◽  
Vol 229 (2) ◽  
pp. 459-467 ◽  
Author(s):  
B P Marin
Keyword(s):  
Atpase Activity ◽  
Equilibrium State ◽  
Hevea Brasiliensis ◽  
Adenosine Triphosphatase ◽  
Atp Hydrolysis ◽  
Rubber Tree ◽  
The Other ◽  
Proton Gradient ◽  
Electrochemical Proton Gradient ◽  
The Relationship

The relationship between tonoplast-bound ATPase activity and the magnitude of the electrochemical proton gradient has been investigated on tightly sealed vesicles prepared from rubber-tree (Hevea brasiliensis) latex. A variety of methods have been used to modify, either alone or together, the two components of the electrochemical proton gradient (delta mu H+). When the delta pH component was decreased either by titration with (NH4)2SO4 or by addition of protonophores or nigericin in the presence of K+, ATPase activity was stimulated. On the other hand, when the delta psi component was decreased either by addition of lipophilic cations or by addition of valinomycin in the presence of K+, ATPase activity decreased. It is concluded that activity of the tonoplast-bound ATPase is regulated by changes in the electrochemical proton gradient across the tonoplast, so that, once the maximum proton gradient is established across the tonoplast, any perturbation of the equilibrium state should result in the increased rate of ATP hydrolysis as the enzyme attempts to re-establish the initial gradient.

Electrochemical proton gradient and phosphate potential in bacterial chromatophores

FEBS Letters ◽  
1974 ◽  
Vol 49 (2) ◽  
pp. 203-207 ◽  
Author(s):  
Rita Casadio ◽  
Assunta Baccarini Melandri ◽  
Davide Zannoni ◽  
Bruno A. Melandri
Keyword(s):  
Proton Gradient ◽  
Phosphate Potential ◽  
Electrochemical Proton Gradient

Gradation of the Magnitude of the Electrochemical Proton Gradient in Mycoplasma Cells

1981 ◽  
Vol 113 (3) ◽  
pp. 499-506 ◽  
Author(s):  
Mohammed BENYOUCEF ◽  
Jean-Louis RIGAUD ◽  
Gerard LEBLANC
Keyword(s):  
Proton Gradient ◽  
Electrochemical Proton Gradient
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