ELECTRON MICROSCOPY

Sample

Escherichia coli RNA polymerase non-regulatory RNA complex - pause prone, closed clamp state

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details Quantifoil UltrAuFoil R1.2/1.3 300 mesh holey gold grids were plasma cleaned on a Model 1070 (Fischione Instruments) for 30 sec at 70% power and with an 80% Argon and 20% Oxygen mixture prior to the application of 0.004 ml of sample. Grids were plunge frozen into liquid ethane using a Vitrobot mark IV (FEI) with 95% chamber humidity at 283K.
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 180841
Reported Resolution (Å) 3.4
Resolution Method FSC 0.143 CUT-OFF
Other Details ?
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol FLEXIBLE FIT
Refinement Target map cross correlation
Overall B Value ?
Fitting Procedure ?
Details ?
Data Acquisition
Detector Type GATAN K3 (6k x 4k)
Electron Dose (electrons/Å2) 52
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 800
Maximum Defocus (nm) 2500
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification ?
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
PARTICLE SELECTION cryoSPARC 3.3
IMAGE ACQUISITION SerialEM ?
CTF CORRECTION CTFFIND 4
MODEL FITTING Coot 0.9
MODEL REFINEMENT PHENIX 1.20
INITIAL EULER ASSIGNMENT cryoSPARC ?
FINAL EULER ASSIGNMENT cryoSPARC 3.3
CLASSIFICATION cryoSPARC 3.3
RECONSTRUCTION cryoSPARC 3.3
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?