Abstract
The dynorphin (Dyn) A analog arodyn (Ac[Phe1-3,Arg4,d-Ala8]Dyn A-(1–11)NH2) is a κ opioid receptor-selective antagonist, but as a linear peptide it is conformationally flexible and subject to metabolism by proteases. To restrict its conformational flexibility both short- and long-range cyclizations via ring-closing metathesis (RCM) involving residues in both the N-terminal “message” and C-terminal “address” sequences were explored. Cyclization between allyglycine (AllGly) residues in positions 5 and 8 yielded peptides with the highest κ opioid receptor affinity (Ki = 54 and 63 nM) and selectivity for κ over µ receptors (185- and 149-fold) comparable to arodyn (175-fold), with similar results for the peptides with the cis and trans double bond configurations; both isomers exhibited competitive antagonism of κ opioid receptors with potencies similar to arodyn. The minor cis isomer cyclized between AllGly residues in positions 2 and 8 exhibited similar κ receptor affinity to arodyn, but lacked selectivity for κ over µ opioid receptors. These results provide important structure-activity relationship information for cyclization of arodyn that we are using in the design of the next generation of cyclic arodyn analogs.
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Notes
Unless otherwise indicated, all amino acids are the L-isomer, and standard abbreviations are used according to the IUPAC-IUB Joint Commission of Biochemical Nomenclature [27]
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Acknowledgements
This research was supported by the National Institute on Drug Abuse grant R01 DA018832. We thank Ms. Bridget Sefranek for her excellent technical assistance with the radioligand and [35S]GTPγS binding assays.
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This paper is dedicated to Dr. Gary Gunewald, an outstanding chemist who has contributed so much to the field of medicinal chemistry and a wonderful colleague.
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Fang, WJ., Murray, T.F. & Aldrich, J.V. Analogs of the κ opioid receptor antagonist arodyn cyclized by ring-closing metathesis retain κ opioid receptor affinity, selectivity and κ opioid receptor antagonism. Med Chem Res 30, 1397–1407 (2021). https://doi.org/10.1007/s00044-021-02758-x
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DOI: https://doi.org/10.1007/s00044-021-02758-x