ELECTRON MICROSCOPY

Sample

MloK1 potassium channel in lipidic bilayer of 2D crystals

Specimen Preperation
Sample Aggregation State 2D ARRAY
Vitrification Instrument ?
Cryogen Name ETHANE
Sample Vitrification Details ?
3D Reconstruction
Reconstruction Method SINGLE PARTICLE
Number of Particles 27849
Reported Resolution (Å) 5.2
Resolution Method FSC 0.143 CUT-OFF
Other Details Resolution estimated based on FSC between spherically-masked half-maps with a soft edge, with the FSC normalized to an expected volume corresponding to a molecular weight of 160 kDa.
Refinement Type
Symmetry Type POINT
Map-Model Fitting and Refinement
ID 1
Refinement Space ?
Refinement Protocol FLEXIBLE FIT
Refinement Target ?
Overall B Value ?
Fitting Procedure ?
Details The consensus model was flexibily fit in to the EM map of this class using Normal Mode Analysis with iMODFIT, and then real-space refined using PHENIX.
Data Acquisition
Detector Type GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å2) 45
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model FEI TITAN KRIOS
Minimum Defocus (nm) 750
Maximum Defocus (nm) 4300
Minimum Tilt Angle (degrees) ?
Maximum Tilt Angle (degrees) ?
Nominal CS 2.7
Imaging Mode BRIGHT FIELD
Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification 50000
Calibrated Magnification ?
Source FIELD EMISSION GUN
Acceleration Voltage (kV) 300
Imaging Details ?
Imaging Experiment
Task Software Package Version
CTF CORRECTION CTFFIND ?
CTF CORRECTION CTFTILT ?
MODEL FITTING iMODFIT 1.44
INITIAL EULER ASSIGNMENT FOCUS ?
FINAL EULER ASSIGNMENT FREALIGN 9.11
CLASSIFICATION FREALIGN 9.11
RECONSTRUCTION FREALIGN 9.11
MODEL REFINEMENT PHENIX 1.13
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION The defocus at the center of each particle box was estimated based on the tilt geometry.