ELECTRON MICROSCOPY

Sample

Heterotrimer of QacA (54kDa) in complexed with two single domain camelid antibodies (A4/B7)

Specimen Preperation
Sample Aggregation State PARTICLE
Vitrification Instrument FEI VITROBOT MARK IV
Cryogen Name ETHANE
Sample Vitrification Details blot time of 5 to 6 seconds before plunging
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 218040
Reported Resolution (Å) 3.8
Resolution Method FSC 0.143 CUT-OFF
Other Details maps were derived from non uniform refinement follwed by density modification in phenix which yielded a resolution of 3.6 angstroms
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol AB INITIO MODEL
Refinement Target ?
Overall B Value 201
Fitting Procedure ?
Details Real space refinement
Data Acquisition
Detector Type GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å2) 51
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 1500
Maximum Defocus (nm) 4500
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 105000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
MODEL REFINEMENT PHENIX 1.20rc4_4425:
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION ?