Experiment: 2GQS

SAICAR Synthetase Complexed with CAIR-Mg2+ and ADP

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.5	296	Well Solution: 3.4-3.8 M sodium formate, 50 mM Tris; Protein Solution: 15 mg/mL protein, 1.5 mM CAIR, 50 mM ADP, 10 mM L-aspartate, 5 mM DTT, 5 mM EDTA, 15 mM Tris, 25 mM KCl, 55 mM magnesium chloride , pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K

Crystal Properties
Matthews coefficient	Solvent content
2.75	55.33

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 59.43	α = 90
b = 67.12	β = 90
c = 149.31	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	120	IMAGE PLATE	RIGAKU RAXIS IV			M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200	1.5418

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	2.05	49.91	90.4	0.059	14.8	5.94		34593

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)
	2.05	2.12	61.7		0.28	4.2	4.36

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 (All)	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	2.05	24.96	34561	34561	3446	90.2	0.224	0.224	0.22	0.2202	0.263	0.2631	RANDOM	31.2

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]
-0.71			-6.55		7.26

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	22.6
c_scangle_it	2.89
c_scbond_it	2.08
c_mcangle_it	1.79
c_angle_deg	1.3
c_mcbond_it	1.19
c_improper_angle_d	0.72
c_bond_d	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3788
Nucleic Acid Atoms
Solvent Atoms	203
Heterogen Atoms	104

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
PDB_EXTRACT	data extraction
CrystalClear	data reduction
d*TREK	data scaling
AMoRE	phasing