Conformational modifications of cyclic hexapeptide somatostatin analogs
- 1 February 1984
- journal article
- research article
- Published by Wiley in International Journal of Peptide and Protein Research
- Vol. 23 (2) , 142-150
- https://doi.org/10.1111/j.1399-3011.1984.tb02704.x
Abstract
A model for the bioactive conformation of the highly active cyclic hexapeptide somatostatin analog cyclo-(Pro-Phe-d-Trp-Lys-Thr-Phe) has been proposed. As a test of this model, several compounds containing lactam and N-Me amino acid conformational modifications in the Thr-Phe-Pro-Phe beta turn were synthesized. The N-Me alanine and sarcosine substitutions for proline gave highly active analogs, while lactam dipeptides in place of Phe-Pro decreased potency. 1H n.m.r. and CD spectra of these analogs illustrate the conformational effects in solution of these modifications. The results provide additional support for the proposed conformational model.Keywords
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