Table 1. The influence of upper interface T248 and L249 mutations on activation gating of the Shaker Kv channela .
Channel proteinb | K+ current? | V1/2 (mV) | Z | ΔG open (kcal/mol) |
Wild type | Observed | −21.6±0.2 | 3.20±0.07 | −1.64±0.04 |
T248A | NO | NA | NA | NA |
L249T | Observed | −19.2±0.2 | 3.04±0.05 | −1.36±0.02 |
T248A;L249T | Observed | 6.4±0.2 | 1.89±0.02 | 0.28±0.01 |
Fig. 2 .a The table displays the gating parameters of all single- and double-mutants used to assess the effect of T248 and or L249 mutation on channel maturation and gating, as addressed in
b Mutants were generated using a monomeric gene construct such that all four subunits carry the indicated mutation.