Table 1. Open intervals and burst durations of wild-type and mutant AChRs on HEK cells.
Open Intervals | Bursts | |||||
---|---|---|---|---|---|---|
τ1, ms | τ2, ms | τ3, ms | τ1, ms | τ2, ms | τ3, ms | |
(a1) | (a2) | (a3) | (a1) | (a2) | (a3) | |
Wild type | 0.037 ± 0.033a | 0.31 ± 0.050 | 1.35 ± 0.051 | 0.036 ± 0.0017b | 0.47 ± 0.059 | 3.31 ± 0.12 |
(0.17 ± 0.022) | (0.27 ± 0.038) | (0.67 ± 0.042) | (0.24 ± 0.021) | (0.21 ± 0.027) | (0.58 ± 0.038) | |
βV266A | 0.068 ± 0.0072 | 0.85 ± 0.087 | 2.27 ± 0.10 | 0.073 ± 0.0068 | 0.88 ± 0.21 | 13.35 ± 0.87 |
(p.Val289Ala) | (0.20 ± 0.0050) | (0.55 ± 0.031) | (0.25 ± 0.030) | (0.41 ± 0.041) | (0.20 ± 0.045) | (0.39 ± 0.046) |
εV265A | 0.035 ± 0.0025 | 0.31 ± 0.030 | 2.61 ± 0.010 | 0.048 ± 0.0070 | 0.44 ± 0.020 | 14.33 ± 0.31 |
(p.Val285Ala) | (0.18 ± 0.0080) | (0.18 ± 0.027) | (0.65 ± 0.019) | (0.43 ± 0.020) | (0.29 ± 0.033) | (0.28 ± 0.014) |
εV265G | 0.080 ± 0.011 | 1.34 ± 0.33 | 5.30 ± 0.38 | 0.082 ± 0.0026 | 1.60 ± 0.39 | 24.46 ± 3.07 |
(p.Val285Gly) | (0.090 ± 0.013) | (0.30 ± 0.026) | (0.61 ± 0.022) | (0.13 ± 0.013) | (0.24 ± 0.063) | (0.64 ± 0.050) |
εV265L | 0.032 ± 0.0079 | 0.52 ± 0.039 | 3.80 ± 0.66 | 0.035 ± 0.0090 | 0.39 ± 0.025 | 10.82 ± 1.10 |
(p.Val285Leu) | (0.36 ± 0.061) | (0.21 ± 0.028) | (0.44 ± 0.071) | (0.52 ± 0.056) | (0.21 ± 0.048) | (0.28 ± 0.095) |
αV255A | 0.046 ± 0.0052 | 0.34 ± 0.022 | 6.31 ± 0.48 | 0.079 ± 0.012 | 0.55 ± 0.083 | 26.59 ± 2.70 |
(p.Val275Ala) | (0.23± 0.020) | (0.09 ± 0.0040) | (0.67 ± 0.028) | (0.32 ± 0.055) | (0.12 ± 0.017) | (0.56 ± 0.053) |
δV269A | 0.042 ± 0.0034 | 0.35 ± 0.073 | 4.72 ± 0.77 | 0.047± 0.0076 | 0.59 ± 0.090 | 13.90 ± 1.89 |
(p.Val290Ala) | (0.22 ± 0.057) | (0.11 ± 0.028) | (0.67 ± 0.079) | (0.30 ± 0.096) | (0.10 ± 0.012) | (0.60 ± 0.099) |
Values indicate mean ± SE of 21 patches for wild-type and at least 3 patches for all mutants. All patches with ACh 50 nM at final bandwidth 11.7 -12 kHz. MP = -80 mV.
τ1 components of opening intervals and bursts were not detected at 12 and 3 patches, respectively, in wild-type AChR. HGVS nomenclature is shown in parentheses.