title: Opioid peptides. Synthesis and binding assays of desamino-Tyr1 dermorphin analogues. XII.
abstract: Eight new dermorphin peptides, X-C6H4-CH2CH2CO-D-Ala-Phe-(L or D)-Yaa-NH2 [X = H, OH; Y = lysine, homoarginine (Har)], were prepared and tested by binding assays. They show negligible affinity for mu-, delta- and K-receptor sites. These findings indicate that the N-terminal ammonium group can not be replaced by the ammonium or guanidinium function located at the side-chain in Lys or Har derivatives.
mesh_terms: D000701:Analgesics, Opioid / Q000138:chemical synthesis* / Q000378:metabolism; D000818:Animals; D001667:Binding, Competitive; D001921:Brain / Q000378:metabolism; D055598:Chemical Phenomena; D002621:Chemistry; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000378:metabolism; D018847:Opioid Peptides; D011957:Receptors, Opioid / Q000378:metabolism*
chemical_list: D000701:Analgesics, Opioid; D009842:Oligopeptides; D018847:Opioid Peptides; D011957:Receptors, Opioid; C030058:dermorphin