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Structural identification of vasodilator binding sites on the SUR2 subunit
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Structural identification of vasodilator binding sites on the SUR2 subunit
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Journal Article
Structural identification of vasodilator binding sites on the SUR2 subunit
2022
Overview
ATP-sensitive potassium channels (K
ATP
), composed of Kir6 and SUR subunits, convert the metabolic status of the cell into electrical signals. Pharmacological activation of SUR2- containing K
ATP
channels by class of small molecule drugs known as K
ATP
openers leads to hyperpolarization of excitable cells and to vasodilation. Thus, K
ATP
openers could be used to treat cardiovascular diseases. However, where these vasodilators bind to K
ATP
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
ATP
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
ATP
openers synergize with Mg-nucleotides to stabilize SUR2 in the NBD-dimerized occluded state to activate the channel.
SUR2-containing KATP channels are drug targets for certain vasodilators. Here, the authors determine high-resolution cryo-EM structures of SUR2 in complex with two vasodilators, P1075 and levcromakalim, uncovering the mechanisms of these drugs.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
