2CHB

CHOLERA TOXIN B-PENTAMER COMPLEXED WITH GM1 PENTASACCHARIDE

X-RAY DIFFRACTION

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Starting Model(s)

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

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5		200 MM MGCL2 100 MM CACODYLATE 5% PEG 1000 PH 7.5

Crystal Properties
Matthews coefficient	Solvent content
2.27	46

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 101.9	α = 90
b = 67.58	β = 105.69
c = 80.47	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	287	AREA DETECTOR	SIEMENS		1993-02-16	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	10	100	0.065				35318

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	2.25	99		0.246

Refinement

Statistics
Diffraction ID	Structure Solution 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	Mean Isotropic B
X-RAY DIFFRACTION		PDB ENTRY 1CHB	2	10	1	28828		81.4	0.171	0.171		22

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]
-8.01		-3.97	2.57		5.44

RMS Deviations
Key	Refinement Restraint Deviation
x_mcangle_it	4.3
x_scangle_it	4.3
x_mcbond_it	2.7
x_scbond_it	2.7
x_angle_deg	1.73
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
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d
x_improper_angle_d_na
x_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4070
Nucleic Acid Atoms
Solvent Atoms	388
Heterogen Atoms	316

Software

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