1CKU

AB INITIO SOLUTION AND REFINEMENT OF TWO HIGH POTENTIAL IRON PROTEIN STRUCTURES AT ATOMIC RESOLUTION

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		5.3		1.3 M AMMONIUM SULPHATE, 40 MM TRIS 180 MM KCL, pH 5.3

Crystal Properties
Matthews coefficient	Solvent content
2.25	45

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 35.067	α = 90
b = 51.389	β = 90
c = 92.39	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MARRESEARCH	BENT CRYSTAL	1997-04-11	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X11		EMBL/DESY, HAMBURG	X11

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	1.2	20	97.4	0.088	9	12.5		50551

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	1.25	94.4		0.2	5.4	2.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	DIRECT METHODS	FREE R	1.2	20	51872	1321	97.4	0.1275	0.1315		0.178	THIN SHELLS

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]

Coordinate Error
Structure Solution Method	Refinement High Resolution	Refinement Low Resolution
1	1182	1562.5

RMS Deviations
Key	Refinement Restraint Deviation
s_similar_dist	0.126
s_approx_iso_adps	0.083
s_non_zero_chiral_vol	0.076
s_zero_chiral_vol	0.07
s_anti_bump_dis_restr	0.057
s_similar_adp_cmpnt	0.031
s_from_restr_planes	0.03
s_angle_d	0.029
s_bond_d	0.013
s_rigid_bond_adp_cmpnt	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1249
Nucleic Acid Atoms
Solvent Atoms	334
Heterogen Atoms	16

Software

Software
Software Name	Purpose
SHELX	model building
SHELXL-97	refinement
DENZO	data reduction
SCALEPACK	data scaling
SHELX	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 R01GM133198.