2Q3B

1.8 A Resolution Crystal Structure of O-Acetylserine Sulfhydrylase (OASS) Holoenzyme From MYCOBACTERIUM TUBERCULOSIS

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1Z7W	PDB ENTRY 1Z7W

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.4	293	0.1 M HEPES, 80% MPD, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
3.53	65.2

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 70.991	α = 90
b = 70.991	β = 90
c = 179.624	γ = 90

Symmetry
Space Group	P 41 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	110	CCD	ADSC QUANTUM 4		2006-09-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-3	0.934	ESRF	ID14-3

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	1.8	38.46	100	0.094	16.4	7.1	43621	43621			21.2

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	1.8	1.9	100		0.542	3.1	7.3	6244

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 (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1Z7W	1.8	37.96	41331	41331	2201	99.98	0.17508	0.17508	0.17415	0.19247	RANDOM	21.76

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]
0.78			0.78		-1.56

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.529
r_dihedral_angle_4_deg	16.242
r_dihedral_angle_3_deg	12.518
r_dihedral_angle_1_deg	5.032
r_scangle_it	2.891
r_scbond_it	1.933
r_angle_refined_deg	1.28
r_mcangle_it	1.023
r_mcbond_it	0.941
r_angle_other_deg	0.824
r_xyhbond_nbd_refined	0.328
r_symmetry_vdw_other	0.3
r_symmetry_vdw_refined	0.266
r_nbd_refined	0.21
r_nbd_other	0.181
r_nbtor_refined	0.164
r_mcbond_other	0.155
r_symmetry_hbond_refined	0.143
r_nbtor_other	0.08
r_chiral_restr	0.072
r_bond_refined_d	0.01
r_gen_planes_refined	0.004
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2242
Nucleic Acid Atoms
Solvent Atoms	203
Heterogen Atoms	33

Software

Software
Software Name	Purpose
REFMAC	refinement
ADSC	data collection
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing