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Journal Article
Research Support, Non-U.S. Gov't
Crystal structures of human ET B receptor provide mechanistic insight into receptor activation and partial activation.
Nature Communications 2018 November 10
Endothelin receptors (ETA and ETB ) are class A GPCRs activated by vasoactive peptide endothelins, and are involved in blood pressure regulation. ETB -selective signalling induces vasorelaxation, and thus selective ETB agonists are expected to be utilized for improved anti-tumour drug delivery and neuroprotection. Here, we report the crystal structures of human ETB receptor in complex with ETB -selective agonist, endothelin-3 and an ETB -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 ETB .
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