Proton-Binding Sites of Acid-Sensing Ion Channel 1
Figure 3
An acidic-residue ring that comprises Glu80 and Glu417.
(Left) side view and (right) top view from the extracellular bulk. Carbon atoms of the residues that belong to the same subunit are depicted in the same color (yellow, pink, and cyan), while those of Gln277 and Gln279 are in white in all the subunits. Gln277 and Gln279 are depicted as sticks. The water oxygen atoms at Glu80 are depicted as blue spheres.