2AQJ

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

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	293	8% PEG20000, 0.1M Mes pH 6.5, 20mM tryptophan, VAPOR DIFFUSION, SITTING DROP, temperature 293 K

Crystal Properties
Matthews coefficient	Solvent content
2.6	52.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 67.63	α = 90
b = 67.63	β = 90
c = 276.027	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	CCD	ADSC QUANTUM 4		2003-11-19	M	MAD
2	1
3	1

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-1	0.934, 0.9796, 0.9798, 0.9252	ESRF	ID14-1

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	1.8	54.66	93	0.071	0.071	6.4	9.1	57128	57013	2.11	2.3	25.52

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)
	1.8	1.9	93	68.8	0.337	0.337	2.3	5.2	5997

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	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	MAD	THROUGHOUT	1.8	54.66	57013	56573	2857	93.12	0.169	0.167	0.168	0.202	RANDOM	29.429

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]
0.24			0.24		-0.49

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.683
r_dihedral_angle_4_deg	20.862
r_dihedral_angle_3_deg	13.857
r_sphericity_free	6.435
r_dihedral_angle_1_deg	6.099
r_scangle_it	3.371
r_sphericity_bonded	2.48
r_scbond_it	2.287
r_mcangle_it	1.67
r_rigid_bond_restr	1.512
r_angle_refined_deg	1.478
r_mcbond_it	1.099
r_nbtor_refined	0.317
r_symmetry_vdw_refined	0.247
r_nbd_refined	0.21
r_xyhbond_nbd_refined	0.158
r_symmetry_hbond_refined	0.128
r_chiral_restr	0.102
r_bond_refined_d	0.013
r_gen_planes_refined	0.007

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4162
Nucleic Acid Atoms
Solvent Atoms	393
Heterogen Atoms	69

Software

Software
Software Name	Purpose
SCALA	data scaling
SOLVE	phasing
RESOLVE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
MOSFLM	data reduction
CCP4	data scaling