5FOB

Crystal Structure of Human Complement C3b in complex with Smallpox Inhibitor of Complement (SPICE)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2I07	PDB ENTRIES 2I07, 3O8E, 2WII
experimental model	PDB	3O8E	PDB ENTRIES 2I07, 3O8E, 2WII
experimental model	PDB	2WII	PDB ENTRIES 2I07, 3O8E, 2WII

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1				75MM AMMONIUM IODIDE, 3.5% PEG 3350

Crystal Properties
Matthews coefficient	Solvent content
3.25	64.22

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 68.891	α = 75.03
b = 83.311	β = 76.2
c = 127.377	γ = 68.5

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					M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-4		ESRF	ID14-4

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	47.8	97.2	0.11	4.3	2		84531		1.5	60.63

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	2.5	2.55	96.3		0.39	1	1.9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	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	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	PDB ENTRIES 2I07, 3O8E, 2WII	2.6	42.356	1.96	75190	2249	97.29	0.1989	0.198	0.2295	80

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
f_dihedral_angle_d	18.734
f_angle_d	0.879
f_chiral_restr	0.061
f_bond_d	0.005
f_plane_restr	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	14003
Nucleic Acid Atoms
Solvent Atoms	207
Heterogen Atoms	235

Software

Software
Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	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.