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Structures of ribosome-bound initiation factor 2 reveal the mechanism of subunit association: Initiation Complex I
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