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Structure of positive allosteric modulator-free active human calcium-sensing receptor
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 5K5S
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 5.667 f_angle_d 0.566 f_chiral_restr 0.042 f_bond_d 0.004 f_plane_restr 0.004
Sample Homodimer human calcium sensing receptor
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details blot for 4 seconds before plunging
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 105000 Reported Resolution (Å) 2.7 Resolution Method FSC 0.143 CUT-OFF Other Details Global (ECD) 2.7A
TM 3.5A Refinement Type Symmetry Type POINT Point Symmetry C2
Map-Model Fitting and Refinement Id 1 (5K5S, 5K5S) Refinement Space REAL Refinement Protocol FLEXIBLE FIT Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type GATAN K3 (6k x 4k) Electron Dose (electrons/Å**2) 70.35
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) 1000 Maximum Defocus (nm) 2500 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 Preliminary grid screening was performed manually.
EM Software Task Software Package Version PARTICLE SELECTION cryoSPARC 2.16 IMAGE ACQUISITION Leginon CTF CORRECTION cryoSPARC 2.16 MODEL FITTING Coot 0.9.1 MODEL REFINEMENT PHENIX 1.14 INITIAL EULER ASSIGNMENT cryoSPARC 2.16 FINAL EULER ASSIGNMENT cryoSPARC 3.0 CLASSIFICATION RELION 3.1 RECONSTRUCTION cryoSPARC 3.0
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 892000