8PET | pdb_00008pet

Cryo-EM structure of the full-length human alpha1beta3 GABA(A) receptor (babba arrangement) in complex with nanobody Nb25, expressed with a 5-fold excess of beta3 over alpha1

ELECTRON MICROSCOPY

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Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	9.919
f_angle_d	0.45
f_chiral_restr	0.04
f_bond_d	0.004
f_plane_restr	0.004

Sample
Cryo-EM structure of the full-length human alpha1beta3 GABA(A) receptor (babba arrangement) in complex with nanobody Nb25, expressed with a 5-fold excess of beta3 over alpha1

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK III
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	213401
Reported Resolution (Å)	2.6
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1
Refinement Space
Refinement Protocol	AB INITIO MODEL
Refinement Target
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K3 (6k x 4k)
Electron Dose (electrons/Å**2)	50.63

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	700
Maximum Defocus (nm)	2100
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification	130000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	Warp
IMAGE ACQUISITION	EPU
CTF CORRECTION	CTFFIND	4.1.13
MODEL FITTING	Coot
MODEL REFINEMENT	PHENIX
INITIAL EULER ASSIGNMENT	cryoSPARC	3.2
FINAL EULER ASSIGNMENT	cryoSPARC	4.1.2
CLASSIFICATION	cryoSPARC	4.1.2
RECONSTRUCTION	cryoSPARC	4.1.2

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		2175702