title: Dicarba analogues of the cyclic enkephalin peptides H-Tyr-c[D-Cys-Gly-Phe-D(or L)-Cys]NH(2) retain high opioid activity.
abstract: Dicarba analogues of the cyclic opioid peptides H-Tyr-c[d-Cys-Gly-Phe-d(or l)-Cys]NH2 were synthesized on solid phase by substituting allylglycines for the cysteines and cyclization by ring-closing metathesis between the side chains of the allylglycine residues. Mixtures of cis and trans isomers of the resulting olefinic peptides were obtained, and catalytic hydrogenation yielded the saturated -CH2-CH2- bridged peptides. The dicarba analogues retained high mu and delta agonist potencies. Remarkably, the trans isomer of H-Tyr-c[d-Allylgly-Gly-Phe-l-Allylgly]NH2 was a mu agonist/delta agonist with subnanomolar potency at both receptors.
authors.affiliation: Laboratory of Chemical Biology and Peptide Research, Clinical Research Institute of Montreal, 110 Pine Avenue West, Montreal, Quebec, Canada H2W 1R7.
authors.forename: Irena
authors.initials: I
authors.lastname: Berezowska
authors.forename: Nga N
authors.initials: NN
authors.lastname: Chung
authors.forename: Carole
authors.initials: C
authors.lastname: Lemieux
authors.forename: Brian C
authors.initials: BC
authors.lastname: Wilkes
authors.forename: Peter W
authors.initials: PW
authors.lastname: Schiller
mesh_terms: D000498:Allyl Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D001921:Brain / Q000378:metabolism; D004745:Enkephalins / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects / Q000502:physiology; D066298:In Vitro Techniques; D008297:Male; D008958:Models, Molecular; D008968:Molecular Conformation; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects / Q000502:physiology; D010456:Peptides, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011869:Radioligand Assay; D051381:Rats; D017465:Receptors, Opioid, delta / Q000819:agonists*; D017450:Receptors, Opioid, mu / Q000819:agonists*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D014649:Vas Deferens / Q000187:drug effects / Q000502:physiology
chemical_list: D000498:Allyl Compounds; D004745:Enkephalins; D010456:Peptides, Cyclic; D017465:Receptors, Opioid, delta; D017450:Receptors, Opioid, mu; C519111:tyrosyl-cyclo(allylglycyl-phenylalanyl-allylglycyl)amide