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 43WO | pdb_000043wo

Cryo-EM structure of the E. coli ArnA hexamer


ELECTRON MICROSCOPY
Sample
Hexameric state of ArnA
Specimen Preparation
Sample Aggregation StatePARTICLE
Vitrification InstrumentFEI VITROBOT MARK IV
Cryogen NameETHANE
Sample Vitrification Details
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles260782
Reported Resolution (Å)3.24
Resolution MethodFSC 0.143 CUT-OFF
Other DetailsGold-standard half maps were generated in cryoSPARC v4.7.1 during final non-uniform refinement from independently refined half-datasets.
Refinement Type
Symmetry TypePOINT
Point SymmetryD3
Map-Model Fitting and Refinement
Id1
Refinement Space
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details
Data Acquisition
Detector TypeTFS FALCON 4i (4k x 4k)
Electron Dose (electrons/Å**2)50
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)
Microscope ModelTFS KRIOS
Minimum Defocus (nm)1750
Maximum Defocus (nm)2750
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS2.7
Imaging ModeBRIGHT FIELD
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)300
Imaging Details
EM Software
TaskSoftware PackageVersion
PARTICLE SELECTIONcryoSPARC4.7.1
MODEL REFINEMENTPHENIX1.21.2_5419
CTF CORRECTIONcryoSPARC4.7.1
INITIAL EULER ASSIGNMENTcryoSPARC4.7.1
FINAL EULER ASSIGNMENTcryoSPARC4.7.1
CLASSIFICATIONcryoSPARC4.7.1
RECONSTRUCTIONcryoSPARC4.7.1
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION3129209Initial particles were selected using blob picking. Templates generated from 2D class averages were subsequently used for template-based particle picking in cryoSPARC