3K1O

Crystal structure of sterol 14-alpha demethylase (CYP51) from Trypanosoma cruzi in complex with a potential antichagasic drug, posaconazole

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3G1Q	PDB entry 3G1Q

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.2	298	PEG 3350, POTASSIUM FORMATE, SODIUM CHLORIDE, pH 7.2, VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.52	51.17

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 63.121	α = 90
b = 63.121	β = 90
c = 229.302	γ = 120

Symmetry
Space Group	P 31 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	MARMOSAIC 225 mm CCD	Be Lenses/Diamond Laue Mono	2009-07-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 21-ID-F	0.97872	APS	21-ID-F

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	2.89	30	99.53	0.067	26	8.5	11966	11910	4.1	4.1	71.7

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	2.89	2.94	100		0.588	4.1	8.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Cut-off Sigma (F)	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	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 3G1Q	2.89	29.17	4.1	4.1	11910	606	99.52	0.23033	0.22807	0.27597	RANDOM	45.997

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]
-0.27	-0.14		-0.27		0.41

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	29.718
r_dihedral_angle_4_deg	15.401
r_dihedral_angle_3_deg	14.266
r_scangle_it	4.078
r_dihedral_angle_1_deg	3.83
r_scbond_it	2.441
r_angle_refined_deg	1.697
r_mcangle_it	1.481
r_mcbond_it	0.77
r_chiral_restr	0.054

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	29.718
r_dihedral_angle_4_deg	15.401
r_dihedral_angle_3_deg	14.266
r_scangle_it	4.078
r_dihedral_angle_1_deg	3.83
r_scbond_it	2.441
r_angle_refined_deg	1.697
r_mcangle_it	1.481
r_mcbond_it	0.77
r_chiral_restr	0.054
r_bond_refined_d	0.014
r_gen_planes_refined	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3491
Nucleic Acid Atoms
Solvent Atoms	10
Heterogen Atoms	94

Software

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

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.