4MR8

Crystal structure of the extracellular domain of human GABA(B) receptor bound to the antagonist CGP35348

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	59.12

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 70.98	α = 90
b = 112.75	β = 97.8
c = 73.45	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		2011-08-16	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-C	0.97949	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	2.15	112.749	99.2	0.037	0.037	18.6	3.7	61684	61684			48.23

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	2.15	2.27	97		0.462	0.462	1.6	3.2	8759

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 4MQE	2.15	59.67	61654	61654	3081	99.09	0.2098	0.2098	0.2091	0.2227	RANDOM	53.2603

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]
3.2186		3.3894	-11.2366		8.018

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	18.44
t_torsion_other	18.44
t_omega_torsion	2.53
t_angle_deg	1.04
t_it	0.944
t_gen_planes	0.013
t_bond_d	0.009
t_trig_c_planes	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6485
Nucleic Acid Atoms
Solvent Atoms	474
Heterogen Atoms	126

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.