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Binding of a hemoregulatory tetrapeptide by a bis-guanidinium crown ether

König, B. ; Späth, A.


A synthetic receptor for the molecular recognition of a tetrapeptide in aqueous buffer was obtained by combining a luminescent crown ether with two pyrrole-guanidinium moieties. The compound interacts with ammonium carboxylates of complementary geometry and binds the hemoregulatory peptide Ac-Ser-Asp-Lys-Pro with K=7x1000 M-1 at physiological pH. Shorter fragments and other tetrapeptides show no ...


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