2Q3C

2.1 A Resolution Crystal Structure of O-Acetylserine Sulfhydrylase (OASS) Holoenzyme From MYCOBACTERIUM TUBERCULOSIS in Complex with the Inhibitory Peptide DFSI

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2Q3B	pdb entry 2Q3B, Holoenzyme

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	293	0.1 M HEPES, 80% MPD, 4 mM DFSI-peptide, pH 8.0, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
3.61	65.96

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 72.458	α = 90
b = 72.458	β = 90
c = 178.936	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 210		2007-03-03	M	SINGLE WAVELENGTH

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

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	2.1	59.66	93.2	0.089	11.5	5.1	26571	26571			31

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	2.1	2.21	96.2		0.352	3.3	5	3941

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 2Q3B, Holoenzyme	2.1	51.23	25171	25171	1341	92.28	0.18826	0.18826	0.18723	0.20747	RANDOM	36.734

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]
1.94			1.94		-3.89

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.041
r_dihedral_angle_4_deg	16.614
r_dihedral_angle_3_deg	12.736
r_angle_other_deg	6.9
r_dihedral_angle_1_deg	4.835
r_scangle_it	2.818
r_scbond_it	1.588
r_angle_refined_deg	1.195
r_mcangle_it	1.002
r_mcbond_it	0.587
r_nbtor_refined	0.299
r_symmetry_vdw_refined	0.216
r_nbd_refined	0.192
r_xyhbond_nbd_refined	0.14
r_chiral_restr	0.13
r_symmetry_hbond_refined	0.109
r_nbd_other	0.093
r_nbtor_other	0.047
r_bond_refined_d	0.009
r_gen_planes_refined	0.004
r_bond_other_d	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2276
Nucleic Acid Atoms
Solvent Atoms	163
Heterogen Atoms	8

Software

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