2QUO

Crystal Structure of C terminal fragment of Clostridium perfringens enterotoxin

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	vapor diffusion, siting drop	8.3	293	0.8 M lithium sulfate monohydrate, 20% glycerol, Tris buffer, pH 8.3, vapor diffusion, siting drop, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.23	44.9

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 37.626	α = 90
b = 49.041	β = 90
c = 69.078	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	100	IMAGE PLATE	RIGAKU RAXIS IV	Osmic Confocal BLue optic	2007-02-10	M	SINGLE WAVELENGTH
2	1	x-ray	100	M	SAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH3R	1.5418
2	ROTATING ANODE	RIGAKU RUH3R	1.5418

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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	1.75	50	99.6	0.093	0.093	23.2	7.5	13039	13039		2.36	22.31

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)
	1.75	1.81	98.2		0.185		3.6	1299

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	SAD	THROUGHOUT	1.75	40	2	13412	13412	663	99.84	0.19891	0.19891	0.197	0.229	RANDOM	14.794

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]
-0.18			-0.08		0.25

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.99
r_dihedral_angle_4_deg	17.231
r_dihedral_angle_3_deg	13.931
r_dihedral_angle_1_deg	9.248
r_scangle_it	1.954
r_angle_refined_deg	1.296
r_scbond_it	1.289
r_mcangle_it	0.767
r_mcbond_it	0.471
r_nbtor_refined	0.304

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.99
r_dihedral_angle_4_deg	17.231
r_dihedral_angle_3_deg	13.931
r_dihedral_angle_1_deg	9.248
r_scangle_it	1.954
r_angle_refined_deg	1.296
r_scbond_it	1.289
r_mcangle_it	0.767
r_mcbond_it	0.471
r_nbtor_refined	0.304
r_nbd_refined	0.211
r_symmetry_vdw_refined	0.211
r_symmetry_hbond_refined	0.167
r_xyhbond_nbd_refined	0.127
r_chiral_restr	0.087
r_bond_refined_d	0.007
r_gen_planes_refined	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1011
Nucleic Acid Atoms
Solvent Atoms	202
Heterogen Atoms	5

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SHELX	phasing
SHELX	model building
REFMAC	refinement
PDB_EXTRACT	data extraction
StructureStudio	data collection
SHELXD	phasing

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.