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From a Cone Snail Toxin to a Competitive MC4R Antagonist.

The melanocortin 4 receptor (MC4R) plays a role in energy homeostasis and represents a target for treating energy balance disorders. For decades, synthetic ligands have been derived from MC4R endogenous agonists and antagonists, such as setmelanotide used to treat rare forms of genetic obesity. Recently, animal venoms have demonstrated their capacity to provide melanocortin ligands with toxins from a scorpion and a spider. Here, we described a cone snail toxin, N-CTX-Ltg1a, with a nanomolar affinity for hMC4R but unrelated to any known toxins or melanocortin ligands. We then derived from the conotoxin the linear peptide HT1-0, a competitive antagonist of Gs, G15, and β-arrestin2 pathways with a low nanomolar affinity for hMC4R. Similar to endogenous ligands, HT1-0 needs hydrophobic and basic residues to bind hMC4R. Altogether, it represents the first venom-derived peptide of high affinity on MC4R and paves the way for the development of new MC4R antagonists.

Date de publication
22 septembre 2022
Reynaud S, Laurin SA, Ciolek J, Barbe P, Van Baelen AC, Susset M, Blondel F, Ghazarian M, Boeri J, Vanden Driessche M, Upert G, Mourier G, Kessler P, Konnert L, Beroud R, Keck M, Servent D, Bouvier M, Gilles N
Référence PubMed
J Med Chem 2022;65(18):12084-12094
ID PubMed
Health and Life Sciences Department, Université Paris Saclay, French Alternative Energies and Atomic Energy Commission (CEA), CEA Saclay, Bat 152, 91191 Gif sur Yvette, France.