4GL5

Structure of human placental aromatase complexed with designed inhibitor HDDG029 (compound 4)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	7.4	277	The enzyme-inhibitor complexes were prepared by the addition from 20mM stock solutions of compound 4 in PEG550 to 18 M (~1mg/ml) of aromatase, to give a final inhibitor concentration of 300 uM. The mixture was incubated overnight at 4 C in 100mM potassium phosphate buffer pH 7.4 containing 20% glycerol, 20mM dithiothreitol, 0.5 M ASD and 1mM BDM. The complex was then concentrated to 25-30mg/ml using ultrafiltration. Protein was setup for crystallization using protein to cocktail ratios 2:1 and 3:1. The protein was mixed with reservoir cocktails of 24-30% polyethylene glycol 4000 in 50mM NaCl, 50mM Tris, pH 8.5 and vapor diffused in sealed 24-well sitting drop plates against corresponding reservoir solution., VAPOR DIFFUSION, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
5.82	78.88

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 140.329	α = 90
b = 140.329	β = 90
c = 118.733	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		2009-12-18	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)	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	3.48	121.53	91.5	0.154	0.154	14.1	3.8	17289	17289	2	1

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	FOURIER SYNTHESIS	THROUGHOUT	3.48	50	17289	15300	832	91.19	0.21277	0.21023	0.26036	RANDOM	91.221

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]
2.91	1.45		2.91		-4.36

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.139
r_dihedral_angle_3_deg	21.448
r_dihedral_angle_4_deg	17.196
r_dihedral_angle_1_deg	6.224
r_scangle_it	1.596
r_angle_refined_deg	1.311
r_mcangle_it	0.925
r_scbond_it	0.879
r_mcbond_it	0.488
r_chiral_restr	0.094
r_bond_refined_d	0.009
r_gen_planes_refined	0.005
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3658
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	69

Software

Software
Software Name	Purpose
HKL-3000	data collection
CCP4	model building
REFMAC	refinement
HKL-3000	data reduction
HKL-3000	data scaling
CCP4	phasing