3MHZ

1.7A structure of 2-fluorohistidine labeled Protective Antigen

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1ACC	A lower resolution structure was initially solved from in-house diffraction data by molecular replacement using 1ACC as the starting model. The resulting model was then refined against the high resolution synchrotron data.

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	8.2	293	30% PEG 400, 0.1M Tris, pH 8.2, vapor diffusion, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.41	48.91

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 71.368	α = 90
b = 93.975	β = 90
c = 119.115	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	100	CCD	ADSC QUANTUM 210r		2009-08-12		SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 17-BM	1.0000	APS	17-BM

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	1.7	50	98.7	0.093	9.8	6.6	88352	88352

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)
	1.7	1.76	89.5		0.589	1.897	4.7	7898

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-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	Mean Isotropic B
X-RAY DIFFRACTION	Direct Replacement	THROUGHOUT	A lower resolution structure was initially solved from in-house diffraction data by molecular replacement using 1ACC as the starting model. The resulting model was then refined against the high resolution synchrotron data.	1.7	50	87519	87519	4400	98.669	0.1917	0.2	0.2217	0.23	27.856

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]
-1.809			-0.604		2.413

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	41.155
r_dihedral_angle_3_deg	13.972
r_dihedral_angle_4_deg	12.072
r_dihedral_angle_1_deg	6.435
r_scangle_it	3.852
r_scbond_it	2.452
r_scangle_other	1.866
r_angle_refined_deg	1.733
r_mcangle_it	1.583
r_angle_other_deg	0.956
r_mcbond_it	0.91
r_mcangle_other	0.716
r_scbond_other	0.499
r_mcbond_other	0.282
r_nbd_refined	0.209
r_symmetry_vdw_other	0.192
r_nbtor_refined	0.173
r_xyhbond_nbd_refined	0.139
r_symmetry_hbond_refined	0.12
r_symmetry_vdw_refined	0.119
r_chiral_restr	0.106
r_metal_ion_refined	0.086
r_symmetry_hbond_other	0.037
r_bond_refined_d	0.016
r_gen_planes_refined	0.007
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5281
Nucleic Acid Atoms
Solvent Atoms	400
Heterogen Atoms	15

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
HKL-2000	data scaling