1FSG

TOXOPLASMA GONDII HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE COMPLEXED WITH 9-DEAZAGUANINE, ALPHA-D-5-PHOSPHORIBOSYL-1-PYROPHOSPHATE (PRPP) AND TWO MG2+ IONS

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
other		UNPUBLISHED T. GONDII HGPRT-GMP COMPLEX STRUCTURE. LOOPS, WATERS AND GMP WERE REMOVED FROM ALL SUBUNITS OF THE MOLECULAR REPLACEMENT MODEL.

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	277	THE PROTEIN (20 mg ml-1) WAS MIXED WITH A SOLUTION CONSISTING OF 30% PEG 4000, 100 MM TRIS.HCL (PH 8.0), 200 MM LI2SO4, and 0.5 % BETA-OCTYLGLUCOPYRANOSIDE. THE CRYSTAL WAS GROWN IN THE PRESENCE OF 2 MM 9-DEAZAGUANINE, 2 MM PRPP AND 10 MM MGCL2 AT 277 K. THE CRYSTAL GREW IN 2 DAYS., VAPOR DIFFUSION, HANGING DROP

Crystal Properties
Matthews coefficient	Solvent content
2.22	45

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 69.33	α = 90
b = 90.18	β = 90
c = 75.72	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MARRESEARCH	RH-COATED MIRROR	1999-03-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL9-1		SSRL	BL9-1

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	1.05	35	99.9	0.072	0.072	8.4	4.2	220504	220504			7.435

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.05	1.08	99.7		0.555	0.555	1.8	3.3	16129

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-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	UNPUBLISHED T. GONDII HGPRT-GMP COMPLEX STRUCTURE. LOOPS, WATERS AND GMP WERE REMOVED FROM ALL SUBUNITS OF THE MOLECULAR REPLACEMENT MODEL.	1.05	35	220433	220504	11158	99.9	0.1222	0.1543	5% of the reflections were randomly selected for the test set.

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
s_angle_d	2.34
s_bond_d	0.015

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3760
Nucleic Acid Atoms
Solvent Atoms	939
Heterogen Atoms	70

Software

Software
Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing
SHELXL-97	refinement
CCP4	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.