4MQE

Crystal structure of the extracellular domain of human GABA(B) receptor in the apo form

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	277	10% PEG3350, 20% glycerol, 0.12 M sodium acetate, pH 7.0, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
3.01	59.13

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 71.08	α = 90
b = 113.08	β = 97.58
c = 73.11	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	ADSC QUANTUM 315		2011-04-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-C	0.97918	APS	24-ID-C

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym I (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	2.35	113.076	98.9	0.042	0.042	14.8	3.7	47242	47242			67.68

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.35	2.48	100		0.483	0.483	1.6	3.8	6925

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 4F11	2.35	23.69	47178	47178	2442	98.95	0.207	0.207	0.2056	0.2316	RANDOM	69.7684

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]
-0.2803		6.3819	-12.4253		12.7056

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	23.11
t_torsion_other	23.1
t_omega_torsion	2.92
t_it	1.328
t_angle_deg	1.16
t_gen_planes	0.015
t_bond_d	0.009
t_trig_c_planes	0.007

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6501
Nucleic Acid Atoms
Solvent Atoms	246
Heterogen Atoms	134

Software

Software
Software Name	Purpose
SCALA	data scaling
BUSTER-TNT	refinement
PDB_EXTRACT	data extraction
XDS	data scaling
XDS	data reduction
PHASER	phasing
BUSTER	refinement

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.