K(2P)2.1 (TREK-1)-activator complexes reveal a cryptic selectivity filter binding site.

K(2P)2.1 (TREK-1)-activator complexes reveal a cryptic selectivity filter binding site.
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k(2p)2.1(Trek-1) - 激活器复合物揭示了一个隐秘的选择性滤波器结合位点。

DOI:
10.1038/nature22988
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发表时间:
2017-07-20
期刊:
影响因子:
64.8
通讯作者:
Minor DL Jr
Minor DL Jr
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lolicato M;Arrigoni C;Mori T;Sekioka Y;Bryant C;Clark KA;Minor DL Jr

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Polymodal K2P (KCNK) thermo- and mechanosensitive TREK potassium channels, generate ‘leak’ currents that regulate neuronal excitability, respond to lipids, temperature, and mechanical stretch, and influence pain, temperature perception, and anesthetic responses. These dimeric voltage-gated ion channel (VGIC) superfamily members have a unique topology comprising two pore forming regions per subunit. Contrasting other potassium channels, K2Ps use a selectivity filter ‘C-type’ gate as the principal gating site. Despite recent advances, K2Ps suffer from a poor pharmacologic profile limiting mechanistic and biological studies. Here, we describe a new small molecule TREK activator class that directly stimulates the C-type gate by acting as molecular wedges that restrict interdomain interface movement behind the selectivity filter. Structures of K2P2.1(TREK-1) alone 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 unveil a previously unknown, druggable K2P site that stabilizes the C-type gate ‘leak mode’ and provide direct evidence for K2P selectivity filter gating.
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