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Abstract
Summary The transport of Pr 3+ across phosphatidylcholine vesicles by etheromycin ( 1 ) is first-order in Pr 3+ and second-order in 1 . It has an Arrhenius activation energy E a = 120 kJ.mol −1 , consonant with carrier-mediated transport. The Pr 3+ cations are transported inside complexed with two molecules of the conjugate base of 1 . The ionophore returns to the outside of the membrane as 1 − , H + . Such an antiport mechanism is structurally unavailable to ligands 2–5. Only in the presence of an uncoupler such as picrate does transport occur at a useful rate with such synthetic ligands.
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