2ARD

The structure of tryptophan 7-halogenase (PrnA) suggests a mechanism for regioselective chlorination

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2AR8

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	293	8% PEG20000, 0.1M Mes pH6.5, 5mM FAD, 30mM sodium dithionite , VAPOR DIFFUSION, SITTING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.6	52.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 68.3	α = 90
b = 68.3	β = 90
c = 274.9	γ = 90

Symmetry
Space Group	P 43 21 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	IMAGE PLATE	RIGAKU RAXIS II		2004-09-20	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU MICROMAX-007

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	2.59	54.82	98.2	0.092	0.089	8	3.97			11.5	2.5	57.69

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	2.59	2.69	96.3	96.3	0.321	0.32	3.3	3.87	1872

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	MOLECULAR REPLACEMENT	THROUGHOUT	2AR8	2.6	54.8	20795	1068	98.52	0.214	0.21	0.211	0.273	RANDOM	29.698

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]
0.25			0.25		-0.5

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.553
r_dihedral_angle_4_deg	19.254
r_dihedral_angle_3_deg	18.594
r_dihedral_angle_1_deg	6.821
r_scangle_it	3.232
r_scbond_it	1.986
r_angle_refined_deg	1.8
r_mcangle_it	1.293
r_mcbond_it	0.721
r_nbtor_refined	0.324

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.553
r_dihedral_angle_4_deg	19.254
r_dihedral_angle_3_deg	18.594
r_dihedral_angle_1_deg	6.821
r_scangle_it	3.232
r_scbond_it	1.986
r_angle_refined_deg	1.8
r_mcangle_it	1.293
r_mcbond_it	0.721
r_nbtor_refined	0.324
r_symmetry_vdw_refined	0.245
r_nbd_refined	0.239
r_symmetry_hbond_refined	0.169
r_xyhbond_nbd_refined	0.166
r_chiral_restr	0.113
r_bond_refined_d	0.017
r_gen_planes_refined	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4008
Nucleic Acid Atoms
Solvent Atoms	93
Heterogen Atoms	53

Software

Software
Software Name	Purpose
d*TREK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
d*TREK	data reduction
MOLREP	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.