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Cryo-EM structure of the undecorated barbed end of filamentous beta/gamma actin
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 8A2T
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 5.3048 f_angle_d 0.5606 f_chiral_restr 0.0417 f_plane_restr 0.0033 f_bond_d 0.0021
Sample actin-phalloidin complex Sample Components cytosolic beta-gamma actin phalloidin
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE-PROPANE Sample Vitrification Details
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 43618 Reported Resolution (Å) 3.59 Resolution Method FSC 0.143 CUT-OFF Other Details Performed in CryoSPARC. All barbed end particles were isolated from from other particles that represented pointed end and filament core. Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (8A2T) Refinement Space REAL Refinement Protocol FLEXIBLE FIT Refinement Target Overall B Value Fitting Procedure Details Real space refinement in phenix.
Data Acquisition Detector Type FEI FALCON III (4k x 4k) Electron Dose (electrons/Å**2) 56
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TALOS ARCTICA Minimum Defocus (nm) 1200 Maximum Defocus (nm) 2700 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 120000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 200 Imaging Details Microsope alignment was performed using SHERPA (Thermo Fisher)
EM Software Task Software Package Version PARTICLE SELECTION crYOLO 1.8 IMAGE ACQUISITION EPU CTF CORRECTION CTFFIND 4.13 MODEL FITTING Coot 0.9.8.1 MODEL REFINEMENT PHENIX 1.20.1-4487-000 INITIAL EULER ASSIGNMENT cryoSPARC 3.3.2 FINAL EULER ASSIGNMENT cryoSPARC 3.3.2 CLASSIFICATION cryoSPARC 3.3.2 RECONSTRUCTION cryoSPARC 3.3.2
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 252982 CrYOLO was trained to pick filament ends.