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Figure 4
The structure of the NaK2K ion channel is shown as ribbons with the residue Phe92 shown as sticks. The A conformation of Phe92 is shown in magenta while the B conformation of Phe92 is shown in blue, with potassium ions shown as orange spheres. (a) Phe92 is located at the bottom of the selectivity filter, for clarity only two of the four subunits that form a complete ion channel are shown. (b) A bottom-up view of a complete ion channel, again conformation A of Phe92 is shown in magenta while the B conformation of Phe92 is shown in blue.

IUCrJ
Volume 7| Part 5| September 2020| Pages 835-843
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520008271