1OK2

Decay accelerating factor (CD55): the structure of an intact human complement regulator.

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1H03	PDB ENTRY 1H03

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		4.6		0.2 M AMMONIUM SULPHATE 20% M-PEG 5K, 0.1M SODIUM ACETATE PH 4.6, 10% GLYCEROL

Crystal Properties
Matthews coefficient	Solvent content
2.59	50

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 47.58	α = 86.56
b = 55.62	β = 84.44
c = 61.53	γ = 64.22

Symmetry
Space Group	P 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	MARRESEARCH		2002-05-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ELETTRA BEAMLINE 5.2R		ELETTRA	5.2R

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	2.5	19	99	0.07	15.4	7		18310			0.239

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1H03	2.5	19	18283	18283		99	0.229			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]

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	19.85
t_it	1.17
t_angle_deg	0.981
t_nbd	0.122
t_gen_planes	0.018
t_bond_d	0.01
t_trig_c_planes	0.007
t_incorr_chiral_ct
t_pseud_angle
t_omega_torsion

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	19.85
t_it	1.17
t_angle_deg	0.981
t_nbd	0.122
t_gen_planes	0.018
t_bond_d	0.01
t_trig_c_planes	0.007
t_incorr_chiral_ct
t_pseud_angle
t_omega_torsion
t_other_torsion
t_improper_torsion
t_chiral_improper_torsion
t_sum_occupancies
t_utility_distance
t_utility_angle
t_utility_torsion
t_ideal_dist_contact

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3930
Nucleic Acid Atoms
Solvent Atoms	275
Heterogen Atoms	80

Software

Software
Software Name	Purpose
SHARP	model building
TNT	refinement
SCALA	data scaling
MOLREP	phasing
BUSTER	phasing
TNT	phasing
SHARP	phasing
DM	phasing
SOLOMON	phasing
SIGMAA	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 R01GM157729.