1XL4

Intermediate gating structure 1 of the inwardly rectifying K+ channel KirBac3.1

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1P7B	PDB ENTRY 1P7B

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.6	293	90mM Hepes, 2.5% PEG 8000, 2.5% PEG 4000, 20% PEG 400, 12.5mM magnesium chloride, 42.5mM magnesium acetate, 2.5% glycerol, 14mM Hega-10, pH 7.6, VAPOR DIFFUSION, SITTING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
3.8	65

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 105.627	α = 90
b = 109.385	β = 90
c = 88.786	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						M	SINGLE WAVELENGTH

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.6	26					29551

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	Brunger	PDB ENTRY 1P7B	2.6	12	3	29249	27724	1525		0.226	0.253	Random

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]
-3.752			-3.714		7.466

RMS Deviations
Key	Refinement Restraint Deviation
x_scangle_it	3.243
x_scbond_it	2.972
x_mcangle_it	2.086
x_mcbond_it	1.695
x_angle_d	1.26
x_bond_d	0.007

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4487
Nucleic Acid Atoms
Solvent Atoms	180
Heterogen Atoms	6

Software

Software
Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
CNS	refinement
X-PLOR	refinement
CCP4	data scaling
CNS	phasing