4MS4

Crystal structure of the extracellular domain of human GABA(B) receptor bound to the agonist baclofen

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.2	293	20% PEG2000, 15% glycerol, 0.2 M ammonium chloride, 0.1 M sodium cacodylate, pH 5.2, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.49	50.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 115.383	α = 90
b = 140.39	β = 90
c = 59.501	γ = 90

Symmetry
Space Group	P 21 21 2

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	1.9	50	98.2	0.073	0.073	10.2	7.1	75350	75350			23.67

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.9	1.93	96.7		0.678		7	3679

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	1.9	27.82	73269	73269	3725	95.21	0.1912	0.1912	0.1898	0.2157	RANDOM	29.0996

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]
2.1877			0.2466		-2.4343

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	19.48
t_torsion_other	19.48
t_omega_torsion	3.39
t_it	1.378
t_angle_deg	1.02
t_gen_planes	0.0176
t_bond_d	0.01
t_trig_c_planes	0.0077

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6535
Nucleic Acid Atoms
Solvent Atoms	690
Heterogen Atoms	28

Software

Software
Software Name	Purpose
SCALEPACK	data scaling
BUSTER-TNT	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection
DENZO	data reduction
PHASER	phasing
BUSTER	refinement

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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.