Cryo-EM structure of the human mitochondrial RNA polymerase transcription initiation complex (POLRMT/TFB2M/DNA/RNA) without TFAM; and with a 2-mer RNA (pppGpA) and GTP poised for catalysis (pre-IC3-TFAM)
ELECTRON MICROSCOPY
Refinement
| RMS Deviations | |
|---|---|
| Key | Refinement Restraint Deviation |
| f_dihedral_angle_d | 16.447 |
| f_angle_d | 0.543 |
| f_chiral_restr | 0.035 |
| f_plane_restr | 0.005 |
| f_bond_d | 0.002 |
| Sample |
|---|
| Cryo-EM structure of the human mitochondrial RNA polymerase transcription initiation complex (POLRMT/TFB2M/DNA/RNA) without TFAM; and with a 2-mer RNA (pppGpA) and GTP poised for catalysis (pre-IC3-TFAM) |
| Sample Components |
| DNA-directed RNA polymerase, mitochondrial |
| DNA (56-mer) |
| Dimethyladenosine transferase 2, mitochondrial |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | FEI VITROBOT MARK IV |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | incubated on the grid for 5 seconds prior to double sided blotting for 3.5 seconds at force 1 |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 136426 |
| Reported Resolution (Å) | 3.5 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C1 |
| Map-Model Fitting and Refinement | |||||
|---|---|---|---|---|---|
| Id | 1 | ||||
| Refinement Space | |||||
| Refinement Protocol | FLEXIBLE FIT | ||||
| Refinement Target | Correlation coefficient | ||||
| Overall B Value | 68 | ||||
| Fitting Procedure | |||||
| Details | |||||
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | FEI FALCON IV (4k x 4k) | ||||||||
| Electron Dose (electrons/Å**2) | 40 | ||||||||
| Imaging Experiment | 1 |
|---|---|
| Date of Experiment | |
| Temperature (Kelvin) | |
| Microscope Model | TFS GLACIOS |
| Minimum Defocus (nm) | 600 |
| Maximum Defocus (nm) | 1800 |
| Minimum Tilt Angle (degrees) | |
| Maximum Tilt Angle (degrees) | |
| Nominal CS | 2.7 |
| Imaging Mode | BRIGHT FIELD |
| Specimen Holder Model | OTHER |
| Nominal Magnification | 130000 |
| Calibrated Magnification | |
| Source | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 200 |
| Imaging Details |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| PARTICLE SELECTION | cryoSPARC | |
| MODEL REFINEMENT | PHENIX | 1.19.2_4158: |
| RECONSTRUCTION | Coot | |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| NONE | ||||
