Journal
ORGANIC LETTERS
Volume 2, Issue 17, Pages 2607-2610Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol006120t
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[GRAPHICS] We show that a tetrapeptide with a heterogeneous backbone, i.e., with two different classes of amino acid residues, adopts a hairpin conformation in which each type of residue plays a different structural role. The alpha residues at the ends form hydrogen bonds characteristic of antiparallel beta-sheet secondary structure, while the central di-beta-peptide segment forms a reverse turn. The configuration of the turn residues is critical to sheet formation.
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