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Cryo-EM structure of an Escherichia coli TnaC(R23F)-ribosome-RF2 complex stalled in response to L-tryptophan
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 6TBV
Sample 70S ribosome stalled during translation of TnaC(R23F) with Pro24 in the P-site and release factor 2 in the A-site. Sample Components 30S subunit 50S subunit P-site tRNA-Pro - TnaC-(R23F) nascent chain mRNA Peptide chain release factor RF2
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 113840 Reported Resolution (Å) 2.6 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (6TBV) Refinement Space Refinement Protocol FLEXIBLE FIT Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type GATAN K2 SUMMIT (4k x 4k) GATAN K2 SUMMIT (4k x 4k) Electron Dose (electrons/Å**2) 40 44
Imaging Experiment 1 2 Date of Experiment Temperature (Kelvin) Microscope Model FEI TALOS ARCTICA FEI TITAN KRIOS Minimum Defocus (nm) -1000 -400 Maximum Defocus (nm) -2000 -1600 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 2.7 2.7 Imaging Mode BRIGHT FIELD BRIGHT FIELD Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER Nominal Magnification 45000 165000 Calibrated Magnification 55127 59880 Source FIELD EMISSION GUN FIELD EMISSION GUN Acceleration Voltage (kV) 200 300 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION RELION 3.1 CTF CORRECTION RELION 3.1 MODEL FITTING UCSF Chimera 1.1.1 MODEL REFINEMENT ISOLDE 1.093 MODEL REFINEMENT PHENIX 1.19.2 MODEL REFINEMENT Coot INITIAL EULER ASSIGNMENT RELION 3.1 FINAL EULER ASSIGNMENT RELION 3.1 CLASSIFICATION RELION 3.1 RECONSTRUCTION RELION 3.1
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 1739950