1SEG

Crystal structure of a toxin chimera between Lqh-alpha-IT from the scorpion Leiurus quinquestriatus hebraeus and AAH2 from Androctonus australis hector

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1AHO	PDB ENTRY 1AHO

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.6	296	100mM trisodium citrate dihydrate, 1M mono-ammonium dihydrogen phosphate, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 296K

Crystal Properties
Matthews coefficient	Solvent content
2.64	52.96

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 74.523	α = 90
b = 74.523	β = 90
c = 56.973	γ = 90

Symmetry
Space Group	I 4 2 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	CCD	ADSC QUANTUM 4		2002-12-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-4	1.003	ESRF	ID14-4

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	1.3	52.7	97.6	0.041	0.041	25.9	12		19554		-3	14.115

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.3	1.35	88.7		0.252	0.051	5.1	12	19647

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 (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MIR	THROUGHOUT	PDB ENTRY 1AHO	1.3	52.7	18549	1002	97.57	0.15472	0.15472	0.15349	0.17802	RANDOM	14.787

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]
-1.96			-1.96		3.91

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	7.483
r_scangle_it	4.763
r_scbond_it	3.348
r_mcangle_it	2.176
r_angle_refined_deg	1.686
r_mcbond_it	1.574
r_angle_other_deg	0.844
r_symmetry_hbond_refined	0.253
r_nbd_other	0.249
r_nbd_refined	0.22
r_xyhbond_nbd_refined	0.196
r_symmetry_vdw_other	0.157
r_chiral_restr	0.109
r_nbtor_other	0.082
r_symmetry_vdw_refined	0.061
r_bond_refined_d	0.016
r_gen_planes_refined	0.009
r_gen_planes_other	0.004
r_bond_other_d	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	518
Nucleic Acid Atoms
Solvent Atoms	119
Heterogen Atoms	18

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing