Table 2.
Crystallographic data collection and refinement statistics
| KcsA E118A | KcsA R122A | |
| Data collection | ||
| Space group | I4 | I4 |
| Cell dimensions | ||
| a, b, c (Å) | 155.95, 155.95, 75.95 | 155.94, 155.94, 75.81 |
| α, β, γ (°) | 90.00, 90.00, 90.00 | 90.00, 90.00, 90.00 |
| Resolution (Å) | 50.0–2.75 (2.85–2.75)a | 50.0–2.75 (2.85–2.75) |
| Rsym | 10.8 (93.2) | 8.3 (65.5) |
| I/σI | 18.5 (2.4) | 20.8 (2.2) |
| Completeness (%) | 99.7 (99.3) | 99.9 (99.2) |
| Redundancy | 7.4 (7.1) | 7.0 (6.2) |
| Refinement | ||
| Resolution (Å) | 49.31–2.75 | 42.87–2.75 |
| No. reflections | 23,757 | 23,755 |
| Rwork/Rfree | 0.183/0.216 | 0.169/0.202 |
| No. atoms | ||
| Protein | 4,057 | 4,081 |
| Ligand/Ion | 37 | 44 |
| Water | 56 | 89 |
| B factors | ||
| Protein | 83.6 | 72.9 |
| Ligand/Ion | 79.2 | 85.0 |
| Water | 57.4 | 56.7 |
| Root mean square deviations | ||
| Bond lengths (Å) | 0.008 | 0.012 |
| Bond angles (°) | 1.481 | 1.819 |
a
Values in parentheses are for the highest-resolution shell.