1QK5

TOXOPLASMA GONDII HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE WITH XMP, PYROPHOSPHATE AND TWO MG2+ IONS

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		8.5	277	30% PEG 4000, 100 MM TRIS.CL (PH 8.5), 200 MM LI2SO4, 0.25 % BETA-OCTYLGLUCOPYRANOSIDE. THE CRYSTAL WAS GROWN IN THE PRESENCE OF 1 MM XANTHINE, 1 MM PRPP AND 10 MM MGCL2 AT 277 K.

Crystal Properties
Matthews coefficient	Solvent content
2.09	43

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 55.208	α = 90
b = 112.255	β = 90
c = 144.28	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	PRINCETON SCIENTIFIC INSTRUMENTS 2K CCD	PT-COATED MIRROR	1998-02-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X25		NSLS	X25

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.6	13	98	0.076	10.3	4.2		58200			24.14

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.6	1.66	93.9		0.373	2.4	3.7

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1QK3, SUBUNIT A, WITHOUT LOOPS, WATERS, OR GMP	1.6	13	55139	2953	98	0.23351	0.26099	RANDOM	25.06

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]

RMS Deviations
Key	Refinement Restraint Deviation
p_scangle_it	3.53
p_mcangle_it	2.466
p_scbond_it	2.282
p_mcbond_it	1.709
p_chiral_restr	0.147
p_angle_d	0.04
p_planar_d	0.038
p_bond_d	0.015
p_plane_restr	0.012
p_angle_deg
p_hb_or_metal_coord
p_singtor_nbd
p_multtor_nbd
p_xhyhbond_nbd
p_xyhbond_nbd
p_planar_tor
p_staggered_tor
p_orthonormal_tor
p_transverse_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3472
Nucleic Acid Atoms
Solvent Atoms	182
Heterogen Atoms	70

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing