1LT6

HEAT-LABILE ENTEROTOXIN B-PENTAMER COMPLEXED WITH METANITROPHENYLGALACTOSIDE

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1LTA	PDB ENTRY 1LTA

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5		pH 7.5

Crystal Properties
Matthews coefficient	Solvent content
2.33	47.27

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 68.67	α = 90
b = 95.36	β = 100.77
c = 85.65	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	295	AREA DETECTOR	SIEMENS	DOUBLY-FOCUSED MIRRORS	1996-09-16	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH2R

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	2.2	25	90.2	0.089		2.23		51781			22

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)
	2.2	2.3	71.8		0.298

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation 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	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1LTA	2.2	25	1	46246		82.8	0.182	0.182	0.273	RANDOM	27

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]
-5.742		1.669	1.919		3.822

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	24.5
x_mcangle_it	6.2
x_scangle_it	6.2
x_mcbond_it	4.1
x_scbond_it	4.1
x_angle_deg	1.66
x_improper_angle_d	1.53
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

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8240
Nucleic Acid Atoms
Solvent Atoms	252
Heterogen Atoms	210

Software

Software
Software Name	Purpose
XENGEN	data collection
MACRO	data reduction
AMoRE	phasing
X-PLOR	refinement
XENGEN	data reduction
MACRO	data scaling