Experiment: 6PNW

X-RAY STRUCTURE OF ERABUTOXIN C, A DIMERIC NEUROTOXIN

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3EBX	PDB entry 3EBX, ERABUTOXIN B

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	EVAPORATION	6	298	PHOSPHATE BUFFER, AMMONIUM SULFATE PH 6

Crystal Properties
Matthews coefficient	Solvent content
2.23	44.87

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 55.6	α = 90
b = 53.75	β = 90
c = 40.99	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	290	DIFFRACTOMETER	SYNTEX	Syntex P21 diffractometer	1983-02-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SEALED TUBE	OTHER	1.542

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	38	85.6	0.08	7.3	2.2		7681

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2	2.2	70

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-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	NONE	PDB entry 3EBX, ERABUTOXIN B	2	10	4	7469		85.6	0.161	0.1855		NONE

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]

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	948
Nucleic Acid Atoms
Solvent Atoms	145
Heterogen Atoms

Software

Software
Software Name	Purpose
PROLSQ	refinement
REFPK	data processing
SORTAV	data scaling
SORTVA	data reduction
TFORM	phasing
FRFS	phasing