3S79

Human placental aromatase cytochrome P450 (CYP19A1) refined at 2.75 angstrom

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.4	277	20-30% PEG 4000, phosphate buffer, pH 7.4, VAPOR DIFFUSION, SITTING DROP, temperature 277K

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 140.218	α = 90
b = 140.218	β = 90
c = 119.271	γ = 120

Symmetry
Space Group	P 32 2 1

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 315		2007-11-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 19-ID	0.979	APS	19-ID

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	2.75	121.43	99.5	0.077	25.42	6	33618	33618			83.2

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.75	2.85	100

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-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	Refinement at higher resolution	THROUGHOUT	PDB ENTRY 3EQM	2.75	121.27	33618	33618	1769	99.15	0.22047	0.22047	0.21965	0.2356	RANDOM	69.152

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]
2.24	1.12		2.24		-3.36

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.828
r_dihedral_angle_3_deg	20.189
r_dihedral_angle_4_deg	16.205
r_dihedral_angle_1_deg	6.177
r_scangle_it	1.851
r_angle_refined_deg	1.272
r_scbond_it	1.04
r_mcangle_it	0.88
r_mcbond_it	0.455
r_chiral_restr	0.101
r_bond_refined_d	0.008
r_gen_planes_refined	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3658
Nucleic Acid Atoms
Solvent Atoms	37
Heterogen Atoms	79

Software

Software
Software Name	Purpose
ADSC	data collection
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling