Cryo-electron microscopy structure of the Slo2.2 Na+-activated K+ channel

Richard K. Hite, Peng Yuan, Zongli Li, Yichun Hsuing, Thomas Walz and Roderick MacKinnon ()
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Richard K. Hite: Rockefeller University and Howard Hughes Medical Institute
Peng Yuan: Rockefeller University and Howard Hughes Medical Institute
Zongli Li: Harvard Medical School
Yichun Hsuing: Rockefeller University and Howard Hughes Medical Institute
Thomas Walz: Harvard Medical School
Roderick MacKinnon: Rockefeller University and Howard Hughes Medical Institute

Nature, 2015, vol. 527, issue 7577, 198-203

Abstract: Abstract Na+-activated K+ channels are members of the Slo family of large conductance K+ channels that are widely expressed in the brain, where their opening regulates neuronal excitability. These channels fulfil a number of biological roles and have intriguing biophysical properties, including conductance levels that are ten times those of most other K+ channels and gating sensitivity to intracellular Na+. Here we present the structure of a complete Na+-activated K+ channel, chicken Slo2.2, in the Na+-free state, determined by cryo-electron microscopy at a nominal resolution of 4.5 ångströms. The channel is composed of a large cytoplasmic gating ring, in which resides the Na+-binding site and a transmembrane domain that closely resembles voltage-gated K+ channels. In the structure, the cytoplasmic domain adopts a closed conformation and the ion conduction pore is also closed. The structure reveals features that can explain the unusually high conductance of Slo channels and how contraction of the cytoplasmic gating ring closes the pore.

Date: 2015
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DOI: 10.1038/nature14958

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