Table 4.
Gating properties of wild-type and hybrid αY93F and αW149F receptors in the presence of TMA
| Receptor | β (s−1) | EC50 (μm) | n | α (s−1) | Θ |
|---|---|---|---|---|---|
| wild-type | 8156 ± 382 | 2375 ± 265 | 1.2 ± 0.1 | 1508 ± 205 | 5.4 |
| αY93F hybrid | 228 ± 67 | 2474 ± 1037 | 1.7 ± 1.2 | 3068 ± 68 | 0.074 |
| αW149F hybrid | 844 ± 430 | 7041 ± 4862 | 1.7 ± 0.6 | 2001 ± 57 | 0.42 |
The values for the wild-type receptor are from Akk & Auerbach (1996). β was determined from the saturation of the effective opening rate by fitting to eqn (1). α was determined in the presence of 2 mM TMA (pipette potential = 50–60 mV). Θ is β/α.