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Structure of human GABA(B) receptor in an inactive state
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 4MQE
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 12.5616 f_angle_d 0.6969 f_chiral_restr 0.0438 f_bond_d 0.0046 f_plane_restr 0.0045
Sample Heterodimer human GABA(B) receptor composed of GABA(B1b) and GABA(B2) subunits.
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE-PROPANE Sample Vitrification Details blot for 4 seconds before plunging
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 233737 Reported Resolution (Å) 3.3 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT Point Symmetry C1
Map-Model Fitting and Refinement Id 1 (4MQE, 4MQE) Refinement Space REAL Refinement Protocol FLEXIBLE FIT Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type GATAN K2 SUMMIT (4k x 4k) Electron Dose (electrons/Å**2) 85
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model FEI TITAN KRIOS Minimum Defocus (nm) -500 Maximum Defocus (nm) -2000 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 130000 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 RELION 3.0 IMAGE ACQUISITION Leginon CTF CORRECTION Gctf 1.06 MODEL FITTING Coot 0.8.9.0 MODEL REFINEMENT PHENIX 1.14 INITIAL EULER ASSIGNMENT cryoSPARC 2 FINAL EULER ASSIGNMENT cryoSPARC 2 RECONSTRUCTION cryoSPARC 2
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION 1048241