2OVC

Crystal structure of a coiled-coil tetramerization domain from Kv7.4 channels

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.5	289	45% MPD, 0.2M ammonium acetate, 0.1M Bis-Tris, pH 5.5, vapor diffusion, hanging drop, temperature 289K

Crystal Properties
Matthews coefficient	Solvent content
2.17	43.25

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 33.185	α = 90
b = 33.185	β = 90
c = 55.283	γ = 90

Symmetry
Space Group	I 4

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	Double Crystal	2005-05-20		SINGLE WAVELENGTH
2	1

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 8.3.1	1.116	ALS	8.3.1
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	2.07	28.46	99.6	0.053	15.3	7.3		1841

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	2.07	2.14	100		0.096		6.1	194

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	2.07	28.46	1841	81	99.25	0.197	0.196	0.224	RANDOM	22.128

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]
-0.24			-0.24		0.48

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	48.328
r_dihedral_angle_3_deg	18.303
r_dihedral_angle_1_deg	5.17
r_scangle_it	4.569
r_scbond_it	2.565
r_dihedral_angle_4_deg	2.443
r_angle_refined_deg	1.586
r_mcangle_it	1.513
r_mcbond_it	0.854
r_nbtor_refined	0.304
r_xyhbond_nbd_refined	0.256
r_nbd_refined	0.224
r_symmetry_vdw_refined	0.215
r_symmetry_hbond_refined	0.195
r_chiral_restr	0.1
r_bond_refined_d	0.014
r_gen_planes_refined	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	245
Nucleic Acid Atoms
Solvent Atoms	18
Heterogen Atoms

Software

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