Schematic structure of the Potassium channel showing the different components and the transport of K+ ions

Diagram

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Top: View of the enzyme from inside the cell showing the entrance pore that admits hydrated ions.

Bottom: View looking up the selectivity filter showing how mobile dehydrated K+ ions are coordinated by peptide carbonyl O atoms provided by each of the four subunits. Note the almost four-fold symmetry axis.

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