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Weltrowska G, Nguyen TMD, Chung NN, Wilkes BC, Schiller PW. Equipotent enantiomers of cyclic opioid peptides at μ opioid receptor. Pept Sci (Hoboken) 2018; 111. [PMID: 30801053 DOI: 10.1002/pep2.24078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Head-to-tail cyclized analogues of the μ opioid receptor (MOR) agonist tetrapeptides DALDA (H-Tyr-D-Arg-Phe-Lys-NH2 and [Dmt1]DALDA (H-Dmt-D-Arg-Phe-Lys-NH2; Dmt = 2',6'-dimethyltyrosine) and their enantiomers (mirror-image isomers) were synthesized and pharmacologically characterized in vitro. Three pairs of enantiomeric cyclic peptides with both mirror-image isomers having equipotent MOR binding affinities but different binding affinities at the δ and κ opioid receptors were identified. The cyclic peptide enantiomers c[-D-Arg-Phe-Lys-Tyr-] (1) and c[-Arg-D-Phe-D-Lys-D-Tyr-] (2) showed nearly identical MOR binding affinity (1 - 2 nM) and equipotent MOR antagonist activity. The results of a MOR docking study indicated a very similar binding mode of the two enantiomers with nearly complete spatial overlap of the peptide ring structures and side chain interactions with the same MOR residues. Compounds 1 and 2 represent the first pair of enantiomeric G-protein-coupled receptor (GPCR) ligands having multiple chiral centers, with both optical antipodes showing equal, low nanomolar receptor binding affinity.
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Affiliation(s)
- Grazyna Weltrowska
- Laboratory of Chemical Biology and Peptide Research, Montreal Clinical Research Institute, 110 Pine Ave. West, Montreal, Quebec, Canada H2W 1R7
| | - Thi M-D Nguyen
- Laboratory of Chemical Biology and Peptide Research, Montreal Clinical Research Institute, 110 Pine Ave. West, Montreal, Quebec, Canada H2W 1R7
| | - Nga N Chung
- Laboratory of Chemical Biology and Peptide Research, Montreal Clinical Research Institute, 110 Pine Ave. West, Montreal, Quebec, Canada H2W 1R7
| | - Brian C Wilkes
- Laboratory of Chemical Biology and Peptide Research, Montreal Clinical Research Institute, 110 Pine Ave. West, Montreal, Quebec, Canada H2W 1R7
| | - Peter W Schiller
- Laboratory of Chemical Biology and Peptide Research, Montreal Clinical Research Institute, 110 Pine Ave. West, Montreal, Quebec, Canada H2W 1R7.,Department of Pharmacology and Physiology, Université de Montréal, Montreal, Quebec, Canada H3C 3J7
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Weltrowska G, Nguyen TMD, Chung NN, Wood J, Ma X, Guo J, Wilkes BC, Ge Y, Laferrière A, Coderre TJ, Schiller PW. A Cyclic Tetrapeptide ("Cyclodal") and Its Mirror-Image Isomer Are Both High-Affinity μ Opioid Receptor Antagonists. J Med Chem 2016; 59:9243-9254. [PMID: 27676089 DOI: 10.1021/acs.jmedchem.6b01200] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Head-to-tail cyclization of the μ opioid receptor (MOR) agonist [Dmt1]DALDA (H-Dmt-d-Arg-Phe-Lys-NH2 (9; Dmt = 2',6'-dimethyltyrosine) resulted in a highly active, selective MOR antagonist, c[-d-Arg-Phe-Lys-Dmt-] (1) ("cyclodal"), with subnanomolar binding affinity. A docking study of cyclodal using the crystal structure of MOR in the inactive form showed a unique binding mode with the two basic residues of the ligand forming salt bridges with the Asp127 and Glu229 receptor residues. Cyclodal showed high plasma stability and was able to cross the blood-brain barrier to reverse morphine-induced, centrally mediated analgesia when given intravenously. Surprisingly, the mirror-image isomer (optical antipode) of cyclodal, c[-Arg-d-Phe-d-Lys-d-Dmt-] (2), also turned out to be a selective MOR antagonist with 1 nM binding affinity, and thus, these two compounds represent the first example of mirror image opioid receptor ligands with both optical antipodes having high binding affinity. Reduction of the Lys-Dmt peptide bond in cyclodal resulted in an analogue, c[-d-Arg-Phe-LysΨ[CH2NH]Dmt-] (8), with MOR agonist activity.
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Affiliation(s)
- Grazyna Weltrowska
- Laboratory of Chemical Biology and Peptide Research, Clinical Research Institute of Montreal , 110 Pine Avenue des Pins Ouest, Montreal, Quebec H2W 1R7, Canada
| | - Thi M-D Nguyen
- Laboratory of Chemical Biology and Peptide Research, Clinical Research Institute of Montreal , 110 Pine Avenue des Pins Ouest, Montreal, Quebec H2W 1R7, Canada
| | - Nga N Chung
- Laboratory of Chemical Biology and Peptide Research, Clinical Research Institute of Montreal , 110 Pine Avenue des Pins Ouest, Montreal, Quebec H2W 1R7, Canada
| | - JodiAnne Wood
- Center for Drug Discovery, Northeastern University , 360 Huntington Avenue, Boston, Massachusetts 02115, United States
| | - Xiaoyu Ma
- Center for Drug Discovery, Northeastern University , 360 Huntington Avenue, Boston, Massachusetts 02115, United States
| | - Jason Guo
- Center for Drug Discovery, Northeastern University , 360 Huntington Avenue, Boston, Massachusetts 02115, United States
| | - Brian C Wilkes
- Laboratory of Chemical Biology and Peptide Research, Clinical Research Institute of Montreal , 110 Pine Avenue des Pins Ouest, Montreal, Quebec H2W 1R7, Canada
| | - Yang Ge
- Anesthesia Research Unit, Department of Anesthesia, McGill University , 3655 Promenade Sir William Osler, Montreal, Quebec H3G 1Y6, Canada
| | - André Laferrière
- Anesthesia Research Unit, Department of Anesthesia, McGill University , 3655 Promenade Sir William Osler, Montreal, Quebec H3G 1Y6, Canada
| | - Terence J Coderre
- Anesthesia Research Unit, Department of Anesthesia, McGill University , 3655 Promenade Sir William Osler, Montreal, Quebec H3G 1Y6, Canada
| | - Peter W Schiller
- Laboratory of Chemical Biology and Peptide Research, Clinical Research Institute of Montreal , 110 Pine Avenue des Pins Ouest, Montreal, Quebec H2W 1R7, Canada.,Department of Pharmacology, Université de Montréal , Montreal, Quebec H3C 3J7, Canada
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Shigenaga T, Otagiri K, Kanehisa H, Okai H. Studies of Bitter Peptides from Casein Hydrolyzate. VII. Bitterness of the retro-BPIa (Val–Ile–Phe–Pro–Pro–Gly–Arg) and Its Fragments. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1984. [DOI: 10.1246/bcsj.57.103] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Otagiri K, Miyake I, Ishibashi N, Fukui H, Kanehisa H, Okai H. Studies of Bitter Peptides from Casein Hydrolyzate. II. Syntheses of Bitter Peptide Fragments and Analogs of BPIa (Arg–Gly–Pro–Pro–Phe–Ile–Val) from Casein Hydrolyzate. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1983. [DOI: 10.1246/bcsj.56.1116] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Vicentini CB, Veronese AC, Giori P, Baraldi PG, Guarneri M. Carboxyl activation in peptide synthesis using 4-oximino-pyrazol-5-ones. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1980; 16:48-54. [PMID: 7440062 DOI: 10.1111/j.1399-3011.1980.tb02933.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
4-Oximino-pyrazol-5-ones 2a, b and their esters with N-protected amino acids 3a, b have been studied for carboxyl activation in peptide synthesis. 2a, b and 3a, b appear to be diastereoisomeric mixtures whose configurations have been assigned on the basis of spectroscopic and X-ray data. Some peptides obtained using these pyrazolone derivatives are reported: no racemization was noted by the Weigand test.
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