3E8Y

Xray structure of scorpion toxin BmBKTx1

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	3.5	292	0.1 M citric acid, 2 M ammonium sulfate, pH 3.5, VAPOR DIFFUSION, HANGING DROP, temperature 292K

Crystal Properties
Matthews coefficient	Solvent content
1.9	35.31

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 56.633	α = 90
b = 56.633	β = 90
c = 31.759	γ = 90

Symmetry
Space Group	I 41/a

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	MAR CCD 300		2007-08-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 23-ID-D	0.97911	APS	23-ID-D

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	1.1	20	99.78	0.045	41.6	5.9		17925			10.1

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)
	1.1	1.129	97.33		0.417	2.35	5.9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	AB INITIO PHASING	THROUGHOUT	1.1	20	17925	2035	99.78	0.20175	0.20006	0.21737	RANDOM	12.096

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]
0.1			0.1		-0.21

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	21.906
r_dihedral_angle_3_deg	11.966
r_sphericity_free	10.207
r_sphericity_bonded	5.928
r_scangle_it	5.335
r_dihedral_angle_1_deg	5.074
r_scbond_it	4.556
r_mcangle_it	3.215
r_rigid_bond_restr	2.297
r_mcbond_it	2.244
r_angle_refined_deg	1.92
r_nbtor_refined	0.312
r_nbd_refined	0.211
r_symmetry_vdw_refined	0.192
r_chiral_restr	0.124
r_xyhbond_nbd_refined	0.111
r_symmetry_hbond_refined	0.095
r_bond_refined_d	0.015
r_gen_planes_refined	0.01

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	240
Nucleic Acid Atoms
Solvent Atoms	22
Heterogen Atoms	6

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
SHELXS	phasing