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Nature. 2017 Jul 20;547(7663):364-368. doi: 10.1038/nature22988. Epub 2017 Jul 10.

K2P2.1 (TREK-1)-activator complexes reveal a cryptic selectivity filter binding site.

Author information

Cardiovascular Research Institute, University of California, San Francisco, California 941158-9001, USA.
Ono Pharmaceutical Co. Ltd, Mishima-Gun, Osaka 618-8585, Japan.
Small Molecule Discovery Center, University of California, San Francisco, California 93858-2330, USA.
Departments of Biochemistry and Biophysics, and Cellular and Molecular Pharmacology, University of California, San Francisco, California 941158-9001, USA.
California Institute for Quantitative Biomedical Research, University of California, San Francisco, California 941158-9001, USA.
Kavli Institute for Fundamental Neuroscience, University of California, San Francisco, California 941158-9001, USA.
Molecular Biophysics and Integrated Bio-imaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.


Polymodal thermo- and mechanosensitive two-pore domain potassium (K2P) channels of the TREK subfamily generate 'leak' currents that regulate neuronal excitability, respond to lipids, temperature and mechanical stretch, and influence pain, temperature perception and anaesthetic responses. These dimeric voltage-gated ion channel (VGIC) superfamily members have a unique topology comprising two pore-forming regions per subunit. In contrast to other potassium channels, K2P channels use a selectivity filter 'C-type' gate as the principal gating site. Despite recent advances, poor pharmacological profiles of K2P channels limit mechanistic and biological studies. Here we describe a class of small-molecule TREK activators that directly stimulate the C-type gate by acting as molecular wedges that restrict interdomain interface movement behind the selectivity filter. Structures of K2P2.1 (also known as TREK-1) alone and with two selective K2P2.1 (TREK-1) and K2P10.1 (TREK-2) activators-an N-aryl-sulfonamide, ML335, and a thiophene-carboxamide, ML402-define a cryptic binding pocket unlike other ion channel small-molecule binding sites and, together with functional studies, identify a cation-π interaction that controls selectivity. Together, our data reveal a druggable K2P site that stabilizes the C-type gate 'leak mode' and provide direct evidence for K2P selectivity filter gating.

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