1V4G

Crystal Structure of gamma-Glutamylcysteine Synthetase from Escherichia coli B

X-RAY DIFFRACTION

---

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.5	298	sodium formate, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
4.74	73.86

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 326.818	α = 90
b = 326.818	β = 90
c = 104.726	γ = 120

Symmetry
Space Group	H 3

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		2002-03-21	M	SINGLE WAVELENGTH
2	1	x-ray	100	CCD	MARRESEARCH		2001-03-13	M	MAD
1,2	1

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SPRING-8 BEAMLINE BL41XU	0.9726	SPring-8	BL41XU
2	SYNCHROTRON	SPRING-8 BEAMLINE BL41XU	0.9792, 0.9794, 0.9839	SPring-8	BL41XU

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	2.5	48.7	100	0.095	9	5.4	144157	144157			56.6

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	2.5	2.59	100		0.346	3.4	5.3	14422

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	2.5	40	136910	136910	7235	99.9	0.2073	0.2058	0.23601	RANDOM	32.97

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]
0.47	0.24		0.47		-0.71

RMS Deviations
Key	Refinement Restraint Deviation
r_scangle_it	5.257
r_dihedral_angle_1_deg	4.954
r_mcangle_it	4.753
r_angle_other_deg	3.787
r_scbond_it	3.737
r_mcbond_it	3.458
r_angle_refined_deg	1.764
r_symmetry_vdw_other	0.343
r_nbd_other	0.3
r_symmetry_hbond_refined	0.24
r_nbd_refined	0.228
r_symmetry_vdw_refined	0.228
r_xyhbond_nbd_refined	0.184
r_nbtor_other	0.133
r_chiral_restr	0.099
r_bond_refined_d	0.02
r_gen_planes_other	0.01
r_gen_planes_refined	0.007
r_bond_other_d

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	15901
Nucleic Acid Atoms
Solvent Atoms	313
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling
SOLVE	phasing