Experiment: 3DDB

Crystal structure of the catalytic domain of Botulinum neurotoxin serotype a with a substrate analog peptide

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3BWI	PDB entry 3BWI

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	293	20% PEG8000, 0.2M Ammoium Sulfate, 0.1M Sodium Cacodylate, 5% Ethylene Glycol, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.17	43.38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 50.871	α = 90
b = 66.581	β = 98.34
c = 65.062	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	100	CCD	ADSC QUANTUM 315	mirrors	2008-03-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X29A	0.979	NSLS	X29A

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	1.6	50	95.4	0.059	23	12.1	53272	53272			15.8

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)
	1.6	1.65	76.3		0.147	2.5	7.7	3514

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	FOURIER SYNTHESIS	THROUGHOUT	PDB entry 3BWI	1.6	32.42	52650	52650	2672	92.7	0.2	0.2	0.1923	0.218	0.2079	RANDOM	23

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]
14.2		0.87	-6.47		-7.73

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	22.7
c_angle_deg	1.2
c_improper_angle_d	0.74
c_bond_d	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3474
Nucleic Acid Atoms
Solvent Atoms	375
Heterogen Atoms	12

Software

Software
Software Name	Purpose
CNS	refinement
CBASS	data collection
HKL-2000	data reduction
HKL-2000	data scaling
CNS	phasing