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. Author manuscript; available in PMC: 2011 Jul 15.
Published in final edited form as: Structure. 2007 Aug;15(8):955–962. doi: 10.1016/j.str.2007.06.012

Figure 1. Structure of Potassium Channel KcsA.

Figure 1

(A) Side view of KcsA. For the front subunit, the three helices are shown in darker color: inner helix, outer helix, and pore helix.

(B) Top view of KcsA. The selectivity filter is highlighted in black for all four subunits. The potassium ions and oxygen atoms of water in the selectivity filter are shown as spheres.