2H2Q | pdb_00002h2q

Crystal structure of Trypanosoma cruzi Dihydrofolate Reductase-Thymidylate synthase

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1J3I	PDB entry 1J3I

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	295	17% 2-Methyl-2,4-Pentanediol, 10% PEG 4000, 0.1M Potassium citrate, pH 6.0, VAPOR DIFFUSION, HANGING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
2.44	49.65

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 88.681	α = 90
b = 137.25	β = 90
c = 189.27	γ = 90

Symmetry
Space Group	C 2 2 21

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	MARRESEARCH		2004-07-02	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 19-BM	0.9998	APS	19-BM

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	2.4	50	99.5	0.061	8.2		45396	45818	1	1

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	2.4	2.49	95.8		0.24			4372

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 (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1J3I	2.4	43.15	45396	43565	2158	95.16	0.208	0.206	0.211	0.241	0.2091	RANDOM	37.46

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]
-3.06			5.28		-2.22

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.667
r_dihedral_angle_4_deg	16.647
r_dihedral_angle_3_deg	16.332
r_dihedral_angle_1_deg	5.24
r_scangle_it	1.379
r_angle_refined_deg	1.113
r_scbond_it	0.833
r_mcangle_it	0.756
r_mcbond_it	0.429
r_nbtor_refined	0.301
r_nbd_refined	0.186
r_symmetry_vdw_refined	0.159
r_xyhbond_nbd_refined	0.119
r_symmetry_hbond_refined	0.103
r_chiral_restr	0.067
r_bond_refined_d	0.007
r_gen_planes_refined	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8028
Nucleic Acid Atoms
Solvent Atoms	307
Heterogen Atoms	136

Software

Software
Software Name	Purpose
REFMAC	refinement
SCALEPACK	data scaling
CNS	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
CCP4	phasing
DENZO	data reduction