ISDA

ELECTRON MICROSCOPY

Sample

Hybrid pre-translocation state of E. coli ribosome 70S-fMetSec-tRNASec-tRNAfmet-SECIS mRNA complex (H)

Specimen Preperation

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	19868
Reported Resolution (Å)	4.6
Resolution Method	FSC 0.143 CUT-OFF
Other Details	Gold-standard refinement of independent half maps in Relion 1.3
Refinement Type
Symmetry Type	POINT

Map-Model Fitting and Refinement

ID	1
Refinement Space	?
Refinement Protocol	FLEXIBLE FIT
Refinement Target	Maximum likelihood
Overall B Value	?
Fitting Procedure	?
Details	For parts of the model exhibiting larger conformational differences and/or lower local map resolution, additional cycles of real space refinement and manual fitting were performed against experimental map filtered to lower resolution

Data Acquisition

Detector Type	FEI FALCON II (4k x 4k)
Electron Dose (electrons/Å²)	30

Imaging Experiment

Date of Experiment	?
Temprature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	700
Maximum Defocus (nm)	2600
Minimum Tilt Angle (degrees)	?
Maximum Tilt Angle (degrees)	?
Nominal CS	0.001
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification	59000
Calibrated Magnification	?
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	Using a Cs-corrector from CEOS electron optical aberrations were corrected to residual phase errors of 45degree at scattering angles of >12 to 15 mrad.

Imaging Experiment

Image Processing

CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING ONLY	Local CTF correction, after MSA based classification and averaging of local power spectra