Table 1.
Cryo-EM data collection, refinement and validation statistics.
| WT C1 (EMDB-24768) | WT C13 (EMDB-24769) (PDB 7SPB) | WT C17 (EMDB-24770) (PDB 7SPC) | TraV/K/B C13 (EMDB-24771) (PDB 7SPI) | TraV/K/B C17 (EMDB-24772) (PDB 7SPJ) | TraV/K/B C16 (EMDB-24773) (PDB 7SPK) | |
|---|---|---|---|---|---|---|
| Data collection and processing | ||||||
| Magnification | 81,000 | 81,000 | 81,000 | 81,000 | 81,000 | 81,000 |
| Voltage (kV) | 300 | 300 | 300 | 300 | 300 | 300 |
| Electron exposure (e−/Å2) | 40 | 40 | 40 | 40 | 40 | 40 |
| Defocus range (μm) | −0.8, −2.8 | −0.8, −2.8 | −0.8, −2.8 | −0.8, −2.8 | −0.8, −2.8 | −0.8, −2.8 |
| Pixel size (Å) | 1.0652 | 1.0652 | 1.0652 | 1.0652 | 1.0652 | 1.0652 |
| Symmetry imposed | C1 | C13 | C17 | C13 | C17 | C16 |
| Initial particle images | 323,000 | 323,000 | 323,000 | 321,000 | 321,000 | 321,000 |
| Final particle images | 70,700 | 70,700 | 70,700 | 148,000 | 26,000 | 22,000 |
| Map resolution (Å) | 4.28 Å | 3.31 Å | 2.95 Å | 2.97 Å | 3.56 Å | 3.90 Å |
| FSC threshold | 0.143 | 0.143 | 0.143 | 0.143 | 0.143 | 0.143 |
| Refinement and model validation | ||||||
| Initial model used (PDB code) | None | None | None | None | None | |
| Model resolution (Å) | 3.7 | 3.2 | 3.3 | 4.0 | 4.0 | |
| FSC threshold | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| Model composition | ||||||
| Non-H atoms | 57,408 | 29,716 | 57,408 | 29,597 | 27,968 | |
| Protein residues Ligands | 7488 | 3978 | 7488 | 3961 | 3744 | |
| R.m.s. deviations | ||||||
| Bond lengths (Å) | 0.009 | 0.010 | 0.009 | 0.010 | 0.006 | |
| Bond angles (°) | 1.535 | 1.304 | 1.529 | 1.406 | 1.055 | |
| Validation | ||||||
| MolProbity score | 2.60 | 2.30 | 2.88 | 2.64 | 1.96 | |
| Clashscore | 19.49 | 12.51 | 16.92 | 17.51 | 14.57 | |
| Poor rotamers (%) | 4.19 | 3.26 | 9.57 | 6.56 | 2.48 | |
| Ramachandran plot | ||||||
| Favored (%) | 95.02 | 95.61 | 93.58 | 96.04 | 95.75 | |
| Allowed (%) | 4.45 | 4.39 | 5.43 | 3.96 | 4.25 | |
| Disallowed (%) | 0.53 | 0 | 0.71 | 0 | 0 | |