3G6J

C3b in complex with a C3b specific Fab

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.8		Crystals of the C3b:S77 complex were obtained within a week at 19\xB0 C from 4 ml hanging drops, consisting of a 1:1 ratio of protein solution (10 mg/ml protein in 50 mM NaCl, 25 mM TRIS pH 7.8) to mother liquor (10% PEG 4000, 0.2 M MgCl2, 100 mM Na-HEPES, pH 7.0), suspended over mother liquor, VAPOR DIFFUSION, HANGING DROP

Crystal Properties
Matthews coefficient	Solvent content
2.93	58.09

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 216.436	α = 90
b = 180.417	β = 115.73
c = 154.584	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	ADSC QUANTUM 315	mirrors	2007-02-08	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 5.0.2	1.0	ALS	5.0.2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	3.05	50	100	0.0135		3.7	101495	101590

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	3.05	3.16	100		0.667	2.1	4.5	10108

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-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 2ICF	3.1	20	96423	96819	4825	99.99	0.2178	0.2178	0.21437	0.2822	RANDOM	35.199

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]
0.78		0.23	-1.05		0.46

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.477
r_dihedral_angle_3_deg	17.418
r_dihedral_angle_4_deg	15.627
r_dihedral_angle_1_deg	6.371
r_mcangle_it	3.208
r_scangle_it	2.177
r_mcbond_it	1.913
r_scbond_it	1.36
r_angle_refined_deg	1.025
r_angle_other_deg	0.792
r_metal_ion_refined	0.234
r_mcbond_other	0.198
r_nbd_refined	0.185
r_nbd_other	0.18
r_nbtor_refined	0.174
r_symmetry_vdw_other	0.155
r_symmetry_vdw_refined	0.141
r_xyhbond_nbd_refined	0.135
r_symmetry_hbond_refined	0.123
r_nbtor_other	0.08
r_chiral_restr	0.061
r_xyhbond_nbd_other	0.023
r_bond_refined_d	0.007
r_gen_planes_refined	0.002
r_bond_other_d	0.001
r_gen_planes_other	0.001
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	31006
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	2

Software

Software
Software Name	Purpose
HKL-2000	data collection
PHASER	phasing
REFMAC	refinement
HKL-2000	data reduction
SCALEPACK	data scaling