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  • 1
    ISSN: 0006-3525
    Keywords: molecular scaffolds ; β-turn ; tachykinin antagonist ; x-ray ; nmr ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We recently reported the rational design, synthesis, and structural characterization of the most potent and selective peptide-based neurokinin A antagonist thus far described: cyclo(Met1-Asp2-Trp3-Phe4-Dap5-Leu6)cyclo(2β-5β). Its bicyclic structure is characterized by a type I and a type II two β-turn around Trp3-Phe4 and Leu6-Met1, respectively. In order to understand whether the two different β-turned structures are determined by the bicyclic structure or by the amino acid type at the corner positions, we have synthesized the pseudosymmetrical analogue cyclo(Phe1-Asp2-Trp3-Phe4-Dap5-Trp6)cyclo(2β-5β). The structural characterization in the crystal state and in solution, here reported, gives an experimental evidence that the backbone of the bicyclic structure is a rigid scaffold that can be used to build both a type I and type II β-turn independently from the amino acid composition. © 1997 John Wiley & Sons, Inc. Biopoly 40: 505-518, 1996
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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