1ADQ

CRYSTAL STRUCTURE OF A HUMAN IGM RHEUMATOID FACTOR FAB IN COMPLEX WITH ITS AUTOANTIGEN IGG FC

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1FC1	PDB ENTRY 1FC1, 2IG2
experimental model	PDB	2IG2	PDB ENTRY 1FC1, 2IG2

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7		CRYSTALS WERE GROWN BY HANGING DROP VAPOR DIFFUSION. THE HANGING DROPS CONSISTED OF 2UL OF PROTEIN SOLUTION CONTAINING EACH PROTEIN AT 1MG/ML IN 0.1 % SODIUM AZIDE, 20MM TRIS-HCL AT PH 7.0, MIXED WITH AN EQUAL VOLUME OF THE RESERVOIR SOLUTION TO BE SCREENED. CRYSTALS WERE OBTAINED WITH RESERVOIR SOLUTIONS CONTAINING 17.5 - 22.5 % (W/V) POLYETHYLENE GLYCOL (MEAN MW 8000) IN 0.1 % SODIUM AZIDE, 100MM TRIS-HCL, PH 7.0, AT TEMPERATURES BETWEEN 17.5 AND 21.5 (CELSIUS)., vapor diffusion - hanging drop

Crystal Properties
Matthews coefficient	Solvent content
2.9	58

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 160.35	α = 90
b = 81.95	β = 98.27
c = 64.24	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	278	IMAGE PLATE	RIGAKU RAXIS II	COLLIMATOR	1994-06-22	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200

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	3.15	15	98.3	0.113	5.3	3.1		14109		3	25.4

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)
	3.15	3.31	98.8		0.265	2.8	3.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1FC1, 2IG2	3.15	8	11603	756	86	0.225	0.225	0.289	RANDOM	33.1

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	26.47
x_angle_deg	1.18
x_improper_angle_d	1.06
x_bond_d	0.005
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	4977
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
DENZO	data reduction
CCP4	data reduction
AMoRE	phasing
X-PLOR	refinement
CCP4	data scaling