Details

Autor(en) / Beteiligte

• Shihoya, Wataru
• Izume, Tamaki
• Inoue, Asuka
• Yamashita, Keitaro
• Kadji, Francois Marie Ngako
• Hirata, Kunio
• Aoki, Junken
• Nishizawa, Tomohiro
• Nureki, Osamu

Titel

Crystal structures of human ETB receptor provide mechanistic insight into receptor activation and partial activation

Ist Teil von

• Nature communications, 2018-11, Vol.9 (1), p.1-11, Article 4711

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract Endothelin receptors (ET A and ET B ) are class A GPCRs activated by vasoactive peptide endothelins, and are involved in blood pressure regulation. ET B -selective signalling induces vasorelaxation, and thus selective ET B agonists are expected to be utilized for improved anti-tumour drug delivery and neuroprotection. Here, we report the crystal structures of human ET B receptor in complex with ET B -selective agonist, endothelin-3 and an ET B -selective endothelin analogue IRL1620. The structure of the endothelin-3-bound receptor reveals that the disruption of water-mediated interactions between W6.48 and D2.50 is critical for receptor activation, while these hydrogen-bonding interactions are partially preserved in the IRL1620-bound structure. Consistently, functional analysis reveals the partial agonistic effect of IRL1620. The current findings clarify the detailed molecular mechanism for the coupling between the orthosteric pocket and the G-protein binding, and the partial agonistic effect of IRL1620, thus paving the way for the design of improved agonistic drugs targeting ET B .