1QM6

Closed form of Clostridium perfringens alpha-toxin strain NCTC8237

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1CA1	CALCIUM-FREE, CLOSED ALPHA-TOXIN STRAIN CER89L43 (PDB CODE: 1CA1)

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	4.7		PROTEIN WAS CRYSTALLISED BY HANGING DROP FROM 1.8-2.0 M NACL IN 0.1 M NA ACETATE, PH 4.7 OR 4.8

Crystal Properties
Matthews coefficient	Solvent content
2.45	50

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 149.54	α = 90
b = 149.54	β = 90
c = 193.83	γ = 120

Symmetry
Space Group	H 3 2

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	MARRESEARCH	MIRRORS	1998-06-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SRS BEAMLINE PX7.2		SRS	PX7.2

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	2.6	30	90.5	0.121	8.8	3.9		29145			28.8

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	2.6	2.7	87.9		0.336	4.2	3.6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	CALCIUM-FREE, CLOSED ALPHA-TOXIN STRAIN CER89L43 (PDB CODE: 1CA1)	2.5	30	26163	1291	90.2	0.22	0.22	0.247	SAME AS FOR PDB 1CA1	18.9

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]
4.442	0.436		4.442		-8.884

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	23.27
c_scangle_it	3.07
c_mcangle_it	2.07
c_scbond_it	1.85
c_angle_deg	1.27
c_mcbond_it	1.17
c_improper_angle_d	1.16
c_bond_d	0.0083
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6012
Nucleic Acid Atoms
Solvent Atoms	89
Heterogen Atoms	4

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALA	data scaling
CNS	phasing
X-PLOR	phasing
CNS	refinement