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  • Title: Specific binding of the calcium antagonist [3H]verapamil to membrane fractions from plants.
    Author: Andrejauskas E, Hertel R, Marmé D.
    Journal: J Biol Chem; 1985 May 10; 260(9):5411-4. PubMed ID: 3157687.
    Abstract:
    Specific binding of the Ca2+ channel blocker [3H] verapamil to a membrane fraction from plants has been characterized. Binding to zucchini membranes was saturable and reversible. The apparent equilibrium dissociation constant is KD = 102 nM and the maximum number of binding sites is Bmax = 60 pmol/mg of protein. The KD determined from the association and dissociation rate constants is 130 nM. [3H]Verapamil binding to zucchini membranes could not be inhibited by the Ca2+ antagonists nifedipine and diltiazem. However, [3H]verapamil could be displaced by diltiazem but not by nifedipine from corn membranes. Sucrose density fractionation of zucchini membrane preparations revealed that [3H]verapamil binding sites are located primarily at the plasma membrane.
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