Table 2. Refinement Statistics.
| resolution limits (Å) | 30.0–2.25 | 
| overall R factora (%)/no. of reflections | 20.1/49929 | 
| working R factor (%)/no. of reflections | 19.8/47391 | 
| free R factor (%)/no. of reflections | 25.8/2538 | 
| no. of protein atoms | 6762 | 
| no. of heteroatoms | 222 | 
| average B value (Å2) | |
| protein atoms | 44.8 | 
| ligand | 32.5 | 
| solvent | 42.7 | 
| weighted root-mean-square deviation from ideality | |
| bond lengths (Å) | 0.015 | 
| bond angles (deg) | 1.8 | 
| planar groups (Å) | 0.007 | 
| Ramachandran regions (%)b | |
| most favored | 90.6 | 
| additionally allowed | 9.0 | 
| generously allowed | 0.4 | 
| disallowed | 0.0 | 
R factor = (∑|Fo – Fc|/∑|Fo|) × 100, where Fo is the observed structure factor amplitude and Fc is the calculated structure factor amplitude.
Distribution of Ramachandran angles according to PROCHECK.32