3J9Y

Cryo-EM structure of tetracycline resistance protein TetM bound to a translating E.coli ribosome


ELECTRON MICROSCOPY
Sample
TetM bound to ErmC L-RNCs
Sample Components
ErmCL-stalled E. coli ribosome
Tetracycline resistance protein TetM
Specimen Preparation
Sample Aggregation StatePARTICLE
Vitrification InstrumentFEI VITROBOT MARK IV
Cryogen NameETHANE
Sample Vitrification DetailsPlunged into liquid ethane (FEI VITROBOT MARK IV)
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles78186
Reported Resolution (Å)3.9
Resolution MethodFSC 0.143 CUT-OFF
Other DetailsSince images from microscopy were processed in the absence of spatial frequencies higher than 8 A, an FSC cut-off value of 0.143 was used for average ...Since images from microscopy were processed in the absence of spatial frequencies higher than 8 A, an FSC cut-off value of 0.143 was used for average resolution determination of 3.9 A (Scheres and Chen, 2012). The final map was sharpened by applying an automatically determined negative B-factor using the program EMBFACTOR (Fernandez et al, 2008). (Single particle--Applied symmetry: C1)
Refinement Type
Symmetry TypePOINT
Point SymmetryC1
Map-Model Fitting and Refinement
Id1 (5AFI)
Refinement SpaceREAL
Refinement ProtocolRIGID BODY FIT
Refinement Target
Overall B Value
Fitting Procedure
DetailsREFINEMENT PROTOCOL--rigid body
Data Acquisition
Detector TypeFEI FALCON II (4k x 4k)
Electron Dose (electrons/Å**2)28
Imaging Experiment1
Date of Experiment2014-03-14
Temperature (Kelvin)
Microscope ModelFEI TITAN KRIOS
Minimum Defocus (nm)700
Maximum Defocus (nm)3500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging ModeBRIGHT FIELD
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification125085
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)300
Imaging Details
EM Software
TaskSoftware PackageVersion
MODEL FITTINGUCSF Chimera
RECONSTRUCTIONSPIDER
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
Defocus groups