Structures of ribosome-bound initiation factor 2 reveal the mechanism of subunit association: Initiation Complex I
ELECTRON MICROSCOPY
| Sample |
|---|
| 70S-fMet-tRNAiMet-IF2-GDPNP complex: Initiation Complex I |
| Sample Components |
| 70S ribosome |
| fMet-tRNAiMet |
| Initiation Factor 2 |
| Specimen Preparation | |
|---|---|
| Sample Aggregation State | PARTICLE |
| Vitrification Instrument | FEI VITROBOT MARK I |
| Cryogen Name | ETHANE |
| Sample Vitrification Details | Blot for 2-4 seconds before plunging into liquid ethane (FEI VITROBOT MARK I). |
| 3D Reconstruction | |
|---|---|
| Reconstruction Method | SINGLE PARTICLE |
| Number of Particles | 14872 |
| Reported Resolution (Å) | 4.6 |
| Resolution Method | FSC 0.143 CUT-OFF |
| Other Details | Final maps were calculated from two combined datasets. To avoid overfitting, the data were refined in a resolution-limited scheme using SPIDER. |
| Refinement Type | |
| Symmetry Type | POINT |
| Point Symmetry | C1 |
| Data Acquisition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Detector Type | GATAN K2 (4k x 4k) | GATAN K2 (4k x 4k) | |||||||
| Electron Dose (electrons/Å**2) | 20 | 20 | |||||||
| Imaging Experiment | 1 | 2 |
|---|---|---|
| Date of Experiment | 2013-08-28 | 2015-06-10 |
| Temperature (Kelvin) | ||
| Microscope Model | FEI POLARA 300 | FEI POLARA 300 |
| Minimum Defocus (nm) | 640 | 190 |
| Maximum Defocus (nm) | 7180 | 7570 |
| Minimum Tilt Angle (degrees) | ||
| Maximum Tilt Angle (degrees) | ||
| Nominal CS | 2 | 2 |
| Imaging Mode | BRIGHT FIELD | BRIGHT FIELD |
| Specimen Holder Model | ||
| Nominal Magnification | 31000 | 31000 |
| Calibrated Magnification | 39000 | 39000 |
| Source | FIELD EMISSION GUN | FIELD EMISSION GUN |
| Acceleration Voltage (kV) | 300 | 300 |
| Imaging Details |
| EM Software | ||
|---|---|---|
| Task | Software Package | Version |
| CTF CORRECTION | CTFFIND | 4 |
| RECONSTRUCTION | EMAN | 2 |
| RECONSTRUCTION | SPARX | |
| RECONSTRUCTION | SPIDER | |
| Image Processing | ||||
|---|---|---|---|---|
| CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
| CTFFIND4 | ||||
