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CD spectra of arginine-vasopressin (AVP) and of its analogues substituted in position 1 and/or 7 were measured in aqueous solution at different pH values. The shapes of the CD spectra of AVP analogues substituted in position 1 are strongly influenced by the type of group attached to the beta-carbon of residue 1. The substitution of the proline residues in position 7 by N-methylalanine also leads to a change in conformation of the peptide. The differences in the CD spectra are interpreted in terms of conformational changes, which are due to the interaction of the tyrosine side chain with neighbouring residues (for 1-substituted analogues of AVP), or to that between the hexapeptide ring and acyclic tripeptide chain (for 7-substituted analogues).
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