1AHO

THE AB INITIO STRUCTURE DETERMINATION AND REFINEMENT OF A SCORPION PROTEIN TOXIN

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6.8		pH 6.8

Crystal Properties
Matthews coefficient	Solvent content
1.96	36.43

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 45.9	α = 90
b = 40.7	β = 90
c = 30.1	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	287	IMAGE PLATE	MARRESEARCH	NA	1994-06-26	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X31	0.72, 0.92	EMBL/DESY, Hamburg	X31

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	0.964	16	91	0.073	6.7	6		31001			7.23

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	0.96	0.99	80		0.543	1.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	DIRECT METHODS	0.96	8	2	31001	30609		88	0.158		10.72

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]

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	19.5
p_staggered_tor	12.6
p_planar_tor	4.9
p_scangle_it	2.37
p_scbond_it	1.692
p_mcangle_it	1.523
p_mcbond_it	1.106
p_xhyhbond_nbd	0.485
p_multtor_nbd	0.201
p_singtor_nbd	0.192
p_xyhbond_nbd	0.148
p_chiral_restr	0.127
p_planar_d	0.041
p_plane_restr	0.041
p_angle_d	0.03
p_bond_d	0.014
p_hb_or_metal_coord	0.011
p_angle_deg
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	500
Nucleic Acid Atoms
Solvent Atoms	129
Heterogen Atoms

Software

Software
Software Name	Purpose
MOSFILM	data collection
ROTAVATA	data reduction
AGROVATA	data reduction
SHAKE-N-BAKE	model building
PROFFT	refinement
MOSFLM	data reduction
CCP4	data scaling
ROTAVATA)	data scaling
SHAKE-N-BAKE	phasing