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Cryo-EM structure of the PP2A:B55-ARPP19 complex
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 3DW8 in silico model AlphaFold P56211
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 8.0161 f_angle_d 0.3804 f_chiral_restr 0.0371 f_plane_restr 0.0024 f_bond_d 0.002
Sample Quadruple complex of PP2A:B55 (PP2Aa:PP2Ac:B55) bound to thiophosphorylated ARPP19
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 52934 Reported Resolution (Å) 2.77 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT
Map-Model Fitting and Refinement Id 1 (3DW8) Refinement Space REAL Refinement Protocol FLEXIBLE FIT Refinement Target Cross-correlation Overall B Value Fitting Procedure Details Iterating between manual refinement in Coot and automated real-space refinement in Phenix
Data Acquisition Detector Type GATAN K3 BIOQUANTUM (6k x 4k) Electron Dose (electrons/Å**2) 70
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 700 Maximum Defocus (nm) 1900 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 105000 Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 300 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION RELION 4.0.1 PARTICLE SELECTION Topaz 0.2.5 IMAGE ACQUISITION EPU 3.2 CTF CORRECTION CTFFIND 4.1.14 CTF CORRECTION RELION 4.0.1 MODEL FITTING UCSF ChimeraX 1.6 INITIAL EULER ASSIGNMENT RELION 4.0.1 FINAL EULER ASSIGNMENT RELION 4.0 RECONSTRUCTION RELION 4.0.1 MODEL REFINEMENT PHENIX 1.20.1-4487 MODEL REFINEMENT Coot 0.9
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 1170216