9CG7

70S initiation complex (tRNA-fMet M1 + AUG start codon)

ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	7K00

Sample
70S initiation complex (tRNA-fMet M1 + AUG start codon)

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	101538
Reported Resolution (Å)	2.75
Resolution Method	FSC 0.143 CUT-OFF
Other Details	cryoSPARC homogeneous 3D refinement
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (7K00)
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target
Overall B Value	64.3
Fitting Procedure
Details	Starting model was fit into the unsharpened 3D reconstruction in UCSF ChimeraX before performing real-space refinement with the sharpened map in PHENI ...	Starting model was fit into the unsharpened 3D reconstruction in UCSF ChimeraX before performing real-space refinement with the sharpened map in PHENIX

Data Acquisition
Detector Type	GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å**2)	58.4

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TALOS ARCTICA
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	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification	79000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	Topaz	0.2.5
IMAGE ACQUISITION	EPU
CTF CORRECTION	cryoSPARC	4.5.3
MODEL FITTING	UCSF ChimeraX	1.8
INITIAL EULER ASSIGNMENT	cryoSPARC	4.5.3
FINAL EULER ASSIGNMENT	cryoSPARC	4.5.3
CLASSIFICATION	cryoSPARC	4.5.3
RECONSTRUCTION	cryoSPARC	4.5.3
MODEL REFINEMENT	PHENIX	1.20.1-4487-000

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION	cryoSPARC patch CTF estimation	492576

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.