3IGQ

Crystal structure of the extracellular domain of a bacterial pentameric ligand-gated ion channel

X-RAY DIFFRACTION

Crystallization

Crystal Properties
Matthews coefficient	Solvent content
2.28	45.96

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 84.45	α = 90
b = 130.24	β = 90
c = 113.59	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 210		2007-08-24	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-1	0.934	ESRF	ID14-1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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	2.3	25	98.4	0.057	11.23	2.03	108138	105975		-3

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	2.3	2.44	97.91		0.424	1.96	2.01

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	SIRAS	THROUGHOUT	2.3	25	53353	2845	99.75	0.20902	0.2066	0.25515	RANDOM	50.431

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]
-0.48			1.07		-0.58

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.291
r_dihedral_angle_4_deg	20.082
r_dihedral_angle_3_deg	16.173
r_dihedral_angle_1_deg	7.621
r_scangle_it	5.581
r_scbond_it	3.176
r_mcangle_it	2.212
r_angle_refined_deg	1.831
r_mcbond_it	1.11
r_chiral_restr	0.113

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.291
r_dihedral_angle_4_deg	20.082
r_dihedral_angle_3_deg	16.173
r_dihedral_angle_1_deg	7.621
r_scangle_it	5.581
r_scbond_it	3.176
r_mcangle_it	2.212
r_angle_refined_deg	1.831
r_mcbond_it	1.11
r_chiral_restr	0.113
r_bond_refined_d	0.019
r_gen_planes_refined	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8603
Nucleic Acid Atoms
Solvent Atoms	408
Heterogen Atoms	42

Software

Software
Software Name	Purpose
SHARP	phasing
REFMAC	refinement
XDS	data reduction
SCALA	data scaling

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.