title: Synthesis and conformational study of a cyclic hexapeptide analogue of somatostatin: cyclo(Phe-D-Trp-Lys-Thr-o-AMPA).
abstract: The active sequence Phe7-D-Trp8-Lys9-Thr10 of somatostatin has been cyclized through o-(aminomethyl)phenylacetic acid, a spacer molecule, designed to mimic a Gly-Gly dipeptide containing a cis-constrained peptide bond. The resulting analogue shows no GH-inhibition. A 2D n.m.r. study reveals conformations different from the proposed bio-active one and still sensitive to the medium (solvent).
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D013006:Growth Hormone / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D013007:Growth Hormone-Releasing Hormone / Q000494:pharmacology; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D010902:Pituitary Gland / Q000187:drug effects / Q000378:metabolism; D011487:Protein Conformation
chemical_list: D007202:Indicators and Reagents; C053145:cyclo-phenylalanyl-tryptophyl-lysyl-threonyl-2-(aminomethyl)phenylacetic acid; D013006:Growth Hormone; D013007:Growth Hormone-Releasing Hormone