National Natural Science Foundation of China (NSFC)
91957201
中国
National Natural Science Foundation of China (NSFC)
31870833
中国
National Natural Science Foundation of China (NSFC)
31821091
中国
引用
ジャーナル: Nat Commun / 年: 2022 タイトル: Structural identification of vasodilator binding sites on the SUR2 subunit. 著者: Dian Ding / Jing-Xiang Wu / Xinli Duan / Songling Ma / Lipeng Lai / Lei Chen / 要旨: ATP-sensitive potassium channels (K), composed of Kir6 and SUR subunits, convert the metabolic status of the cell into electrical signals. Pharmacological activation of SUR2- containing K channels by ...ATP-sensitive potassium channels (K), composed of Kir6 and SUR subunits, convert the metabolic status of the cell into electrical signals. Pharmacological activation of SUR2- containing K channels by class of small molecule drugs known as K openers leads to hyperpolarization of excitable cells and to vasodilation. Thus, K openers could be used to treat cardiovascular diseases. However, where these vasodilators bind to K and how they activate the channel remains elusive. Here, we present cryo-EM structures of SUR2A and SUR2B subunits in complex with Mg-nucleotides and P1075 or levcromakalim, two chemically distinct K openers that are specific to SUR2. Both P1075 and levcromakalim bind to a common site in the transmembrane domain (TMD) of the SUR2 subunit, which is between TMD1 and TMD2 and is embraced by TM10, TM11, TM12, TM14, and TM17. These K openers synergize with Mg-nucleotides to stabilize SUR2 in the NBD-dimerized occluded state to activate the channel.