Table 1. Crystallographic summary.
Values in parentheses are for the highest resolution shell.
| Space group | P212121 |
| Unit-cell parameters (Å) | a = 49.2, b = 95.6, c = 226.6 |
| Maximum resolution (Å) | 2.5 (2.54–2.50) |
| Unique reflections | 36773 |
| Completeness | 95.2 (71.2) |
| I/σ(I) | 27.3 (4.6) |
| Mosaicity (°) | 0.64 |
| Redundancy | 2.9 (2.5) |
| Rmerge† | 0.063 (0.248) |
| VM (Å3 Da−1) | 2.36 |
| Refinement | |
| Protein atoms | 7442 |
| Other atoms | 40 (Neu5Ac2en), 124 waters, 1 Cl− |
| Resolution range (Å) | 30–2.5 |
| Rcryst‡ | 0.246 |
| Rfree‡ | 0.298 |
| Mean temperature factor (Å2) | |
| Protein, monomer A/B | 29/45 |
| Neu5Ac2en, monomer A/B | 25/45 |
| Waters | 25 |
| R.m.s.d. bond lengths (Å) | 0.007 |
| R.m.s.d. bond angles (°) | 1.145 |
| Ramachandran favoured/outliers (%) | 90.5/3.7 |
†
R
merge = 
.
‡
R
cryst and R
free = 
− 
; R
free was calculated for a 5% set of reflections excluded from the refinement.