3JCJ
Structures of ribosome-bound initiation factor 2 reveal the mechanism of subunit association
ELECTRON MICROSCOPY
Sample |
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70S-fMet-tRNAiMet-IF2-GDPNP complex |
Sample Components |
70S ribosome |
fMet-tRNAiMet |
Initiation Factor 2 |
Specimen Preparation | |
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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 | |
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Reconstruction Method | SINGLE PARTICLE |
Number of Particles | 54585 |
Reported Resolution (Å) | 3.7 |
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 | |||||||||
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Detector Type | GATAN K2 SUMMIT (4k x 4k) | ||||||||
Electron Dose (electrons/Å**2) | 20 |
Imaging Experiment | 1 | 2 |
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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 | ||||
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CTF Correction Type | CTF Correction Details | Number of Particles Selected | Particle Selection Details | |
CTFFIND4 |