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. Author manuscript; available in PMC: 2015 Feb 2.
Published in final edited form as: Annu Rev Physiol. 2007;69:317–340. doi: 10.1146/annurev.physiol.69.040705.142215

Table 2.

Comparison of selectivity properties of several K+ channelsa

Channel γ, pS PX/PK, bi-ionic
K+ Rb+ NH4+ Tl+ Rb+ NH4+ Tl+
KcsA (129) 55.6 ± 0.6 23.2 ± 0.8 24.0 ± 0.3 16.4 ± 0.1 0.78 ± 0.07 0.20 ± 0.01 3.2 ± 0.1
Shaker(130) 18 9 14 — 0.66 0.09 —
BK (131) 230 20 41 111 0.7 0.1 1.3
Kir2.1 (33) 29 3 17 24 0.49 0.1 1.8
a

References are in parentheses under the first column.