3IJ4

Cesium sites in the crystal structure of a functional acid sensing ion channel in the desensitized state

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	277.15	150-350 mM NaCl, 100 mM HEPES, 23-28% PEG 400, 10 mM taurine, soaked in 250 mM CsCl cryo solution, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K

Crystal Properties
Matthews coefficient	Solvent content
3.75	67.19

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 131.787	α = 90
b = 131.787	β = 90
c = 119.107	γ = 120

Symmetry
Space Group	H 3

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	vertically collimating premirror, LN2 cooled double-crystal silicon (111) monochromator, toroidal focusing M2 mirror	2008-08-23	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 5.0.2	1.3776	ALS	5.0.2

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	3	80	93.5	0.095				15430

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)
	3	3.077	95.7		0.084	1.1

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	MOLECULAR REPLACEMENT	THROUGHOUT	3	27.47	14636	794	99.97	0.225	0.223	0.272	RANDOM	51.848

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]

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.674
r_dihedral_angle_3_deg	18.186
r_dihedral_angle_4_deg	10.908
r_dihedral_angle_1_deg	6.406
r_angle_refined_deg	1.163
r_scangle_it	0.95
r_mcangle_it	0.742
r_scbond_it	0.562
r_mcbond_it	0.407
r_nbtor_refined	0.301

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.674
r_dihedral_angle_3_deg	18.186
r_dihedral_angle_4_deg	10.908
r_dihedral_angle_1_deg	6.406
r_angle_refined_deg	1.163
r_scangle_it	0.95
r_mcangle_it	0.742
r_scbond_it	0.562
r_mcbond_it	0.407
r_nbtor_refined	0.301
r_nbd_refined	0.194
r_symmetry_hbond_refined	0.187
r_symmetry_vdw_refined	0.161
r_xyhbond_nbd_refined	0.129
r_chiral_restr	0.08
r_bond_refined_d	0.007
r_gen_planes_refined	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3190
Nucleic Acid Atoms
Solvent Atoms	54
Heterogen Atoms	5

Software

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

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 R01GM157729.