Acyclic model peptides with ionophoretic activity

Abstract
Two linear synthetic peptides, N‐tBoc‐Pro‐Gly‐Ala‐NHCH3 and N‐tBoc‐Pro‐D‐Ala‐Ala‐NHCH3, have previously been shown by us to complex with Ca2+ and form 2:1 (peptide:calcium) complexes. Here we report their binding to Pr3+ and demonstrate, by 1H NMR, the peptide‐mediated transport of Pr3+ across dimyristoylphosphatidylcholine unilamellar vesicles via a 2:1 ion‐sandwich complex.