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Structural identification of vasodilator binding sites on the SUR2 subunit.
- Source :
- Nature Communications; 5/13/2022, Vol. 13 Issue 1, p1-9, 9p
- Publication Year :
- 2022
-
Abstract
- ATP-sensitive potassium channels (K<subscript>ATP</subscript>), composed of Kir6 and SUR subunits, convert the metabolic status of the cell into electrical signals. Pharmacological activation of SUR2- containing K<subscript>ATP</subscript> channels by class of small molecule drugs known as K<subscript>ATP</subscript> openers leads to hyperpolarization of excitable cells and to vasodilation. Thus, K<subscript>ATP</subscript> openers could be used to treat cardiovascular diseases. However, where these vasodilators bind to K<subscript>ATP</subscript> 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<subscript>ATP</subscript> 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<subscript>ATP</subscript> 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 13
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 156892117
- Full Text :
- https://doi.org/10.1038/s41467-022-30428-y