1BL8

POTASSIUM CHANNEL (KCSA) FROM STREPTOMYCES LIVIDANS

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5		ONE-TO-MIXTURE OF PROTEIN SOLUTION AND RESERVOIR (200 MM CACL2, 100 MM HEPES PH 7.5, 48% PEG 400).

Crystal Properties
Matthews coefficient	Solvent content
4.99	75.34

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 128.78	α = 90
b = 68.93	β = 124.63
c = 112.04	γ = 90

Symmetry
Space Group	C 1 2 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	PRINCETON 2K			M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	CHESS BEAMLINE A1		CHESS	A1

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	3.2	30	93.3	0.086		6.1		12603		2	90

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	3.2	3.3	66.6			2.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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	MIR	3.2	10	2	12054	1252	93.3	0.28	0.28	0.29	SHELL

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
x_dihedral_angle_d	23.73
x_angle_deg	1.1
x_improper_angle_d	0.53
x_bond_d	0.006
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2820
Nucleic Acid Atoms
Solvent Atoms	1
Heterogen Atoms	3

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CCP4	model building
SHELXL-97	model building
X-PLOR	refinement
CCP4	phasing
SHELXL-97	phasing