期刊
CELL REPORTS
卷 27, 期 6, 页码 1848-+出版社
CELL PRESS
DOI: 10.1016/j.celrep.2019.04.050
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资金
- Electron Microscopy Laboratory
- Ministry of Science and Technology of China (National Key R&D Program of China) [2016YFA0502004]
- National Natural Science Foundation of China [31622021, 31870833, 31821091]
- Beijing Natural Science Foundation [5192009]
- Young Thousand Talents Program of China
- China Postdoctoral Science Foundation [2016M600856, 2017T100014]
- Boya Postdoctoral Fellowship of Peking University
Repaglinide (RPG) is a short-acting insulin secretagogue widely prescribed for the treatment of type 2 diabetes. It boosts insulin secretion by inhibiting the pancreatic ATP-sensitive potassium channel (K-ATP). However, the mechanisms by which RPG binds to the K-ATP channel are poorly understood. Here, we describe two cryo-EM structures: the pancreatic K-ATP channel in complex with inhibitory RPG and adenosine-5'-(gamma-thio)-triphosphate (ATP gamma S) at 3.3 angstrom and a medium-resolution structure of a RPG-bound mini SUR1 protein in which the N terminus of the inward-rectifying potassium channel 6.1 (Kir6.1) is fused to the ABC transporter module of the sulfonylurea receptor 1 (SUR1). These structures reveal the binding site of RPG in the SUR1 subunit. Furthermore, the high-resolution structure reveals the complex architecture of the ATP binding site, which is formed by both Kir6.2 and SUR1 subunits, and the domain-domain interaction interfaces.
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