5X93

Human endothelin receptor type-B in complex with antagonist K-8794

Summary for 5X93

• Entry DOI: 10.2210/pdb5x93/pdb
• Descriptor: Endothelin B receptor,Endolysin,Endothelin B receptor, 3-[6-[(4-tert-butylphenyl)sulfonylamino]-5-(2-methoxyphenoxy)-2-pyrimidin-2-yl-pyrimidin-4-yl]oxy-N-(2,6-dimethylphenyl)propanamide, (2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate, ... (6 entities in total)
• Functional Keywords: alpha helical, signaling protein
• Biological source: Homo sapiens (Human); More
• Cellular location: Cell membrane ; Multi-pass membrane protein: P24530
• Total number of polymer chains: 1
• Total formula weight: 57555.78

Authors

Shihoya, W.,Nishizawa, T.,Yamashita, K.,Hirata, K.,Okuta, A.,Tani, K.,Fujiyoshi, Y.,Doi, T.,Nureki, O. (deposition date: 2017-03-05, release date: 2017-08-16, Last modification date: 2024-10-16)

Primary citation

Shihoya, W.,Nishizawa, T.,Yamashita, K.,Inoue, A.,Hirata, K.,Kadji, F.M.N.,Okuta, A.,Tani, K.,Aoki, J.,Fujiyoshi, Y.,Doi, T.,Nureki, O.
X-ray structures of endothelin ETB receptor bound to clinical antagonist bosentan and its analog
Nat. Struct. Mol. Biol., 24:758-764, 2017

PubMed Abstract: Endothelin receptors (ETRs) have crucial roles in vascular control and are targets for drugs designed to treat circulatory-system diseases and cancer progression. The nonpeptide dual-ETR antagonist bosentan is the first oral drug approved to treat pulmonary arterial hypertension. Here we report crystal structures of human endothelin ET receptor bound to bosentan and to the ET-selective analog K-8794, at 3.6-Å and 2.2-Å resolution, respectively. The K-8794-bound structure reveals the detailed water-mediated hydrogen-bonding network at the transmembrane core, which could account for the weak negative allosteric modulation of ET by Na ions. The bosentan-bound structure reveals detailed interactions with ET, which are probably conserved in the ET receptor. A comparison of the two structures shows unexpected similarity between antagonist and agonist binding. Despite this similarity, bosentan sterically prevents the inward movement of transmembrane helix 6 (TM6), and thus exerts its antagonistic activity. These structural insights will facilitate the rational design of new ETR-targeting drugs.

PubMed: 28805809
DOI: 10.1038/nsmb.3450

Experimental method

X-RAY DIFFRACTION (2.2 Å)