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Multiresidue Tetrapeptide Substitutions Yield a 140-fold Selective Melanocortin-3 over Melanocortin-4 Receptor Agonist

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Specialty Chemistry
Date 2021 Jan 25
PMID 33488972
Citations 2
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Abstract

The five melanocortin receptors regulate numerous physiological functions. Although many ligands have been developed for the melanocortin-4 receptor (MC4R), the melanocortin-3 receptor (MC3R) has been less-well characterized, in part due to the lack of potent, selective tool compounds. Previously an Ac-His-Arg-(pI)DPhe-Tic-NH scaffold, inverting the Phe-Arg motif of the native melanocortin signal sequence, was identified to possess mMC3R over mMC4R selective agonist activity. In this study, a library of 12 compounds derived from this scaffold was synthesized and assayed at the mouse melanocortin receptors (MCRs), utilizing substitutions previously shown to increase mMC3R agonist potency and/or selectivity. One compound (, Ac-Val-Gln-DBip-DTic-NH) was identified as greater than 140-fold selective for the mMC3R over the mMC4R, possessed 70 nM potency at the mMC3R, and partially stimulated the mMC4R at 100 μM concentrations without antagonist activity. This pharmacological profile may be useful in developing new tool and therapeutic ligands that selective signal through the MC3R.

Citing Articles

Recommended Tool Compounds for the Melanocortin Receptor (MCR) G Protein-Coupled Receptors (GPCRs).

Weirath N, Haskell-Luevano C ACS Pharmacol Transl Sci. 2024; 7(9):2706-2724.

PMID: 39296259 PMC: 11406693. DOI: 10.1021/acsptsci.4c00129.


Incorporation of Indoylated Phenylalanine Yields a Sub-Micromolar Selective Melanocortin-4 Receptor Antagonist Tetrapeptide.

Ericson M, Larson C, Freeman K, Nicke L, Geyer A, Haskell-Luevano C ACS Omega. 2022; 7(31):27656-27663.

PMID: 35967074 PMC: 9366794. DOI: 10.1021/acsomega.2c03307.

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