4WFE

Human TRAAK K+ channel in a K+ bound conductive conformation

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.8	277	50 mM Tris pH 8.8, 200 mM CaCl2, 27-30% (vol/vol) PEG400, 4% (vol/vol) polypropylene glycol

Crystal Properties
Matthews coefficient	Solvent content
3.41	63.96

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 80.795	α = 90
b = 138.522	β = 95.08
c = 96.843	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	MARMOSAIC 300 mm CCD		2012-11-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 23-ID-D	1.0332	APS	23-ID-D

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.5	48.2	99.6	0.063	22.6	3.8		69456

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.5	2.54	99.8		0.9	3.7

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	4I9W	2.5	48.2	69456	3686	99.59	0.20086	0.19908	0.2341	RANDOM	89.526

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]
-2.11		3.03	-3.19		4.69

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.082
r_dihedral_angle_4_deg	17.186
r_dihedral_angle_3_deg	15.159
r_long_range_B_refined	11.99
r_long_range_B_other	11.987
r_scangle_other	8.401
r_dihedral_angle_1_deg	6.54
r_mcangle_it	6.43
r_mcangle_other	6.43
r_scbond_it	5.8
r_scbond_other	5.799
r_mcbond_it	4.367
r_mcbond_other	4.365
r_angle_refined_deg	1.058
r_angle_other_deg	0.665
r_chiral_restr	0.062
r_bond_refined_d	0.008
r_gen_planes_refined	0.007
r_gen_planes_other	0.003
r_bond_other_d	0.002
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	10398
Nucleic Acid Atoms
Solvent Atoms	191
Heterogen Atoms	9

Software

Software
Software Name	Purpose
REFMAC	refinement
PHASER	phasing