Crystal structure of human endothelin ETBreceptor in complex with peptide inverse agonist IRL2500.Nagiri, C., Shihoya, W., Inoue, A., Kadji, F.M.N., Aoki, J., Nureki, O.
(2019) Commun Biol 2: 236-236
- PubMed: 31263780
- DOI: 10.1038/s42003-019-0482-7
- PubMed Abstract:
Endothelin receptors (ET <sub>A </sub> and ET <sub>B </sub>) are G-protein-coupled receptors activated by endothelin-1 and are involved in blood pressure regulation. IRL2500 is a peptide-mimetic of the C-terminal tripeptide of endothelin-1, and has b ...
Endothelin receptors (ET A and ET B ) are G-protein-coupled receptors activated by endothelin-1 and are involved in blood pressure regulation. IRL2500 is a peptide-mimetic of the C-terminal tripeptide of endothelin-1, and has been characterized as a potent ET B -selective antagonist, which has preventive effects against brain edema. Here, we report the crystal structure of the human ET B receptor in complex with IRL2500 at 2.7 Å-resolution. The structure revealed the different binding modes between IRL2500 and endothelin-1, and provides structural insights into its ET B -selectivity. Notably, the biphenyl group of IRL2500 penetrates into the transmembrane core proximal to D 2.50 , thus stabilizing the inactive conformation. Using the newly-established constitutively active mutant, we clearly demonstrate that IRL2500 functions as an inverse agonist for the ET B receptor. The current findings will expand the chemical space of ETR antagonists and facilitate the design of inverse agonists for other class A GPCRs.
2Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, 980-8578 Miyagi Japan.,1Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, 113-0033 Japan.