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A radioimmunoassay using antibodies raised against bovine serum albumin-conjugated fusicoccin (FC) was applied to measure FC bound to the plasma membrane (PM) isolated from seedlings of radish (Raphanus sativus L.) and of Arabidopsis thaliana treated in vivo plus or minus the toxin. FC bound to the PM from seedlings treated with 5 [mu]M FC was 2-fold (radish) to 7-fold (A. thaliana) higher than the binding capacity of control PM. FC binding depended on the duration of the in vivo treatment but was unaffected by cycloheximide. When FC binding and the PM H+-ATPase activity were compared under different conditions (in vivo or in vitro treatment of different lengths or with different concentrations of FC), a strict linear relation between FC binding and the activation of the PM H+-ATPase was observed in both plant materials under all the conditions tested. Comparison between the maximum binding capacity and the amount of H+-ATPase observed in PM from the two plant materials suggest a one-to-one stoichiometry between the FC receptor and the PM H+-ATPase.

plant physiology

Fusicoccin Binding to Its Plasma Membrane Receptor and the Activation of the Plasma Membrane H+-ATPase (III. Is There a Direct Interaction between the Fusicoccin Receptor and the Plasma Membrane H+-ATPase?)