Abstract

Sequential L,D polypeptides have been the object of investigations by many authors (1–4), since it was realized that they are strictly related to a natural occurring peptide, gramicidin A, which forms monovalent cation selective transmembrane channels in biological membranes and lipid bilayers (5,6). Here we present the results obtained by x-ray analysis of a linear hexapeptide, Boc-(D-aIle-L-Ile) 3-OMe, which, in the solid state, gives rise to a chain reversal stabilized by multiple intramolecular hydrogen bonds. It is the first description of a β-turn (C 10) and an α-turn (C 13) fused together and included in a larger 17-membered ring (C 17) occurring in a linear peptide.

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