Figure 2.
![Figure 2. Comparison of ion distribution in MthK K+ channel. (Left) The selectivity filter of MthK with K+ ions (Protein Data Bank [PDB] accession no. 3LDC). An Fo–Fc ion omit map (4σ) shows the electron density in the filter. (Right) The selectivity filter of MthK with Na+ ions (PDB accession no. 3LDE). An Fo–Fc ion omit map (4σ) shows the electron density in the filter. Structures are from Ye et al. (2010).](https://cdn.rupress.org/rup/content_public/journal/jgp/146/1/10.1085_jgp.201511371/5/jgp_201511371_fig2.jpeg?Expires=1773524317&Signature=ZS9k9eL5ALTii8u8lvU4NBCYbYsM4lm9qbbPZ7pi~LaUmHKI~g0rHI-h2z2G2mIKtw6wx1AHF7FNn9UhIFEQDLLVtzc91sQf0ix0KV-mxNtkCZedsFSjML~q6Uxmdguwx1pi4sAZ5bidTMuHX~oPDfYCi1EbikhDASpt5Srhq5O8fCdQ8cJbWCMG3jjSg~rDXG8foefLz8FOMo69Bt5drZdAqxvVU4ci1Z4huXZMYg261GWecS~NGrTO7jvVCtaNWLrNnam0z7a~u8I9GlqacXUmMV8dFrnctmb96rIA6~ODl1~2gaW4xgeKtUbACuZlUvaZAMVaDbR0p-1PlMWB4w__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Comparison of ion distribution in MthK K+ channel. (Left) The selectivity filter of MthK with K+ ions (Protein Data Bank [PDB] accession no. 3LDC). An Fo–Fc ion omit map (4σ) shows the electron density in the filter. (Right) The selectivity filter of MthK with Na+ ions (PDB accession no. 3LDE). An Fo–Fc ion omit map (4σ) shows the electron density in the filter. Structures are from Ye et al. (2010).
