TABLE II

Po of Kv7.2 and Kv7.3 WT and Mutant Channels at 0 mV


Cell-attached
n
Inside-out + 25 μM diC8-PIP2
n
Kv7.2 wt 0.18 ± 0.04 0.25 ± 0.04 
K452E 0.10 ± 0.02 0.081 ± 0.031 
R459E 0.10 ± 0.02 0.088 ± 0.019 
R461E 0.093 ± 0.025 0.096 ± 0.008 
KRR-EEE 0.017 ± 0.005 10 0.032 ± 0.020 
K425Q 0.07 ± 0.01 0.05 ± 0.01 
K452Q 0.086 ± 0.006 0.093 ± 0.014 
R459Q 0.075 ± 0.007 0.061 ± 0.012 
R461Q 0.076 ± 0.008 0.087 ± 0.015 
KRR-QQQ 0.059 ± 0.013 0.055 ± 0.006 
R463Q 0.045 ± 0.022 0.042 ± 0.019 
R467Q 0.071 ± 0.033 10 0.079 ± 0.025 
R463E 0.42 ± 0.20 10 0.46 ± 0.12 
R467E 0.45 ± 0.19 0.52 ± 0.11 
K449E 0.195 ± 0.07 0.19 ± 0.05 
K469E 0.20 ± 0.06 0.21 ± 0.09 
D458N 0.20 ± 0.04 0.21 ± 0.03 
Kv7.3 wt 0.75 ± 0.09 0.72 ± 0.16 
K406Q 0.26 ± 0.10 0.27 ± 0.07 
KKR-EEE 0.34 ± 0.03 0.10 ± 0.04 
E423V 0.65 ± 0.19 0.67 ± 0.17 
N431D 0.73 ± 0.10 0.66 ± 0.16 

Cell-attached
n
Inside-out + 25 μM diC8-PIP2
n
Kv7.2 wt 0.18 ± 0.04 0.25 ± 0.04 
K452E 0.10 ± 0.02 0.081 ± 0.031 
R459E 0.10 ± 0.02 0.088 ± 0.019 
R461E 0.093 ± 0.025 0.096 ± 0.008 
KRR-EEE 0.017 ± 0.005 10 0.032 ± 0.020 
K425Q 0.07 ± 0.01 0.05 ± 0.01 
K452Q 0.086 ± 0.006 0.093 ± 0.014 
R459Q 0.075 ± 0.007 0.061 ± 0.012 
R461Q 0.076 ± 0.008 0.087 ± 0.015 
KRR-QQQ 0.059 ± 0.013 0.055 ± 0.006 
R463Q 0.045 ± 0.022 0.042 ± 0.019 
R467Q 0.071 ± 0.033 10 0.079 ± 0.025 
R463E 0.42 ± 0.20 10 0.46 ± 0.12 
R467E 0.45 ± 0.19 0.52 ± 0.11 
K449E 0.195 ± 0.07 0.19 ± 0.05 
K469E 0.20 ± 0.06 0.21 ± 0.09 
D458N 0.20 ± 0.04 0.21 ± 0.03 
Kv7.3 wt 0.75 ± 0.09 0.72 ± 0.16 
K406Q 0.26 ± 0.10 0.27 ± 0.07 
KKR-EEE 0.34 ± 0.03 0.10 ± 0.04 
E423V 0.65 ± 0.19 0.67 ± 0.17 
N431D 0.73 ± 0.10 0.66 ± 0.16 

Given on the left are the values of the unitary current and Po of the indicated wt or mutant channels at 0 mV in cell-attached patches or in inside-out patches in the presence of 25 μM diC8-PIP2. n refers to the number of patches in each case. For Kv7.2, KRR-EEE and KRR-QQQ refer to the triple mutant of K452, R459, and R461. For Kv7.3, KKR-EEE refers to the triple mutant of K425, K432, and R434.

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