3CIQ

A regulatable switch mediates self-association in an immunoglobulin fold

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.4	288	28% PEG 3350, 200 mM ammonium tartrate dibasic, pH 7.40, VAPOR DIFFUSION, SITTING DROP, temperature 288K

Crystal Properties
Matthews coefficient	Solvent content
2.59	52.58

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 67.594	α = 104.38
b = 68.047	β = 94.15
c = 96.218	γ = 117.77

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	NSLS BEAMLINE X12B		NSLS	X12B

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	2.9	50	95.3	0.079		2.2		28565

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	2.9	3	96.5		0.363		2.2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	2.9	50	28565	1539	94.77	0.2267	0.22475	0.26393	RANDOM	57.443

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]
-0.86	-0.24	2.65	-2.42	2.36	4.6

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.168
r_dihedral_angle_3_deg	14.492
r_dihedral_angle_4_deg	12.324
r_dihedral_angle_1_deg	6.172
r_scangle_it	5.372
r_mcangle_it	4.899
r_scbond_it	3.74
r_mcbond_it	3.546
r_angle_refined_deg	0.895
r_nbtor_refined	0.294
r_nbd_refined	0.18
r_symmetry_vdw_refined	0.166
r_xyhbond_nbd_refined	0.109
r_metal_ion_refined	0.081
r_symmetry_hbond_refined	0.079
r_chiral_restr	0.068
r_bond_refined_d	0.006
r_gen_planes_refined	0.002
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	9836
Nucleic Acid Atoms
Solvent Atoms	76
Heterogen Atoms	22

Software

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