Table 1.
Data collection and refinement statistics
| Data collection | |
| Wavelength, Å | 0.979 |
| Resolution range, Å | 30.0–2.5 (2.6–2.5) |
| Total number of observations | 277,638 |
| Unique reflections | 49,835 (7,094) |
| Completeness, % | 99.1 (95.2) |
| Redundancy | 5.6 (5.0) |
| 〈I/σ(I)〉 | 6.3 (1.6) |
| Rmerge, % | 12.6 (76.5*) |
| Refinement | |
| Resolution range, Å | 20.0–2.5 |
| Reflections in Rwork | 46,767 |
| Reflections in Rfree | 2,620 |
| Rwork, % | 24.4 |
| Rfree, % | 29.4 |
| rms deviations | |
| Bond lengths, Å | 0.021 |
| Bond angles, ° | 2.953 |
| Torsion angles, ° | 21.895 |
| No. of atoms | 12,353 |
| RNA | 4,126 |
| Protein | 7,736 |
| Water molecules | 474 |
| Mean temperature factor for all atoms, Å2 | 50.4 |
| SRP19, S domain A, B | 39.2, 39.8 |
| SRP54, S domain A, B | 54.6, 63.2 |
| SRP RNA, S domain A, B | 32.1, 35.3 |
| Water molecules | 45.9 |
Values in parentheses are for the highest-resolution shell.
*The R factor for the highest-resolution shell is high; however, the redundancy of 5.0 allows useful data to be obtained in this shell.