Table 3. Suppressing KC1-AKT1 K+ Current in X. laevis Oocytes by VAMP721 Depends on the Longin Domain Residue Tyr-57.
| V1/2 (mV) | gmax (ms) | δ | |
|---|---|---|---|
| AKT1 | −93.1 ± 1.0 | 0.52 ± 0.01 | −1.45 ± 0.03 |
| AKT1+KC1 | −186.8 ± 2.1 | ||
| AKT1+KC1+VAMP721 | −212.2 ± 3.2* | ||
| AKT1+KC1+VAMP723 | −189.2 ± 1.4 | ||
| AKT1+KC1+VAMP721Y57A | −209.7 ± 3.1* | ||
| AKT1+KC1+VAMP721Y57D | −187.1 ± 2.4 |
Parameter values are results of joint, nonlinear least-squares fitting of K+ currents in Figure 10. Fittings were carried out with the gating charge, δ, and gmax held in common, and values for the voltage giving half-maximal conductance V1/2 were allowed to vary between data sets. Data are from seven or more separate experiments for each construct combination and are given as means ± se. Significance for V1/2 as the difference from KC1-AKT1 expressed alone at *P < 0.01.