1LTI

HEAT-LABILE ENTEROTOXIN (LT-I) COMPLEX WITH T-ANTIGEN

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	liquid - liquid diffusion	7.5		LIQUID-LIQUID DIFFUSION CAPILLARY CONTAINS: 0.1M TRIS PH 7.5, 0.1M NACL, 0.001M EDTA, 0.02% SODIUM AZIDE, 4.5 MG/ML LT-I, 0.025M LACTOSE AND 5% PEG 6000. CRYSTAL WAS SOAKED FOR 1 DAY IN LACTOSE FREE MOTHER LIQUOR CONTAINING 0.1M D-GAL-BETA1,3GALNAC BEFORE DATA COLLECTION., liquid - liquid diffusion

Crystal Properties
Matthews coefficient	Solvent content
2.3	46

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 119.7	α = 90
b = 100.5	β = 90
c = 64.4	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	298	IMAGE PLATE	RIGAKU RAXIS		1995-12-10	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1

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	2.13	77	86.2	0.054	12.2	2.5		38264

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)
	2.13	2.25	73.5		0.16

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION		FREE-R	2.13	8	2	37447		86.5	0.185	0.185	0.274	RANDOM	33.9

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	23
x_angle_deg	1.96
x_improper_angle_d	1.5
x_bond_d	0.012
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	5978
Nucleic Acid Atoms
Solvent Atoms	183
Heterogen Atoms	59

Software

Software
Software Name	Purpose
RAXIS	data collection
RAXIS	data reduction
X-PLOR	model building
X-PLOR	refinement
R-AXIS	data reduction
R-AXIS	data scaling
X-PLOR	phasing