Table 1. Data and refinement statistics. Values in parentheses pertain to the highest resolution shell (width = 0.1 Å).
| Structure | Complex I | Complex II | Complex IIIa (In-house) | Complex IIIb (Synchrotron) |
| Protein Data Bank code | 2IYO | 2IYP | 2IZ0 | 2IZ1 |
| Space group | P3212 | C2 | C2 | C2 |
| Unit cell | ||||
| a, b, c (Å) | 60.58, 60.58, 243.13 | 71.06, 105.06, 240.48 | 71.06, 104.81, 240.52 | 71.07, 104.82, 240.52 |
| β (°) | 98.3 | 98.5 | 98.3 | |
| Resolution range (Å) | 20–2.4 | 30–2.8 | 45–2.6 | 35–2.3 |
| Unique reflections/Redundancy | 19588/5.5 | 39483/1.8 | 52468/2.9 | 73076/6.1 |
| Completeness (%) | 95.7 (74.8) | 90.7 (81.9) | 97.5 (83.4) | 94.5 (67.3) |
| < I/ σ(I) > /Mosaicity (°) | 13.7 (6.7)/0.4 | 6.5 (3.0)/0.6 | 41.7 (11.4)/0.3 | 32.9 (11.2)/0.3 |
| R-sym (%)a | 6.5 (14.6) | 7.9 (25.0) | 7.0 (18.0) | 5.7 (12.7) |
| Wilson B (Å2) | 40.5 | 50.9 | 36.9 | 31.8 |
| No. of protein residues/solvent molecules | 470/313 | 1407/429 | 1406/1708 | 1406/1963 |
| R-work b/R-free c (%) | 15.9/22.1 | 18.3/26.3 | 12.3/19.3 | 13.7/19.7 |
| Average B (Å2) | ||||
| Overall/protein/solvent | 27.6/27.2/32.1 | 36.8/36.9/31.7 | 16.7/15.3/24.9 | 18.9/16.4/32.8 |
| rmsd | ||||
| Bond lengths (Å)/bond angles (°) | 0.009/1.165 | 0.010/1.315 | 0.008/1.124 | 0.010/1.234 |
| Cruickshank’s DPId (Å) | 0.24 | 0.41 | 0.25 | 0.19 |
| Ramachandran plot (%) | ||||
| Most favoured region | 94.2 | 91.7 | 94.0 | 93.7 |
| Additional allowed regions | 5.3 | 7.8 | 5.4 | 5.6 |
| General allowed regions | 0.0 | 0.2 | 0.1 | 0.2 |
| Disallowed region | 0.5 | 0.3 | 0.5 | 0.5 |
a
R-sym = ΣhΣi||(h,i) - < I(h) > I/ΣhΣi I(h,i), where |(h,i) is the intensity of the ith measurement of reflection h and < |(h) > is the mean value of |(h,i) for all i measurements.
b
R-work = Σhkl||Fo| − |Fc||/Σ|Fo|, where Fo is the observed structure-factor amplitude and Fc the structure-factor amplitude calculated from the model.
c
R-free is the same as R-work except only calculated using a subset, 5%, of the data that are not included in any least-squares refinement calculations.
d
DPI = diffraction-component precision index [35].