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Figure 5.
Figure 5: Structure of the MthK K+ channel. a, A single
four-fold repeated unit of the MthK channel contains a pore
domain (blue cylinders) and two RCK domains (blue and red
ribbons). Disordered segments (dashed) and Ca^2+ ions (yellow
spheres) are shown. b, Molecular surface of the MthK tetramer
viewed from the side (extracellular surface on top) with one
unit removed. Green and yellow spheres show K+ and Ca^2+ ions,
respectively. c, Stereo diagram of the Ca^2+-binding site with
protein atoms in green and red and Ca^2+ in yellow. All ribbon
diagrams were prepared using RIBBONS39 and all surface models
using GRASP40.
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