2P5M

C-terminal domain hexamer of AhrC bound with L-arginine

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.8	277	28% PEG 400, 0.1M Tris-HCl, 0.2M magnesium chloride, pH 8.8, VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.44	49.65

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 117.014	α = 90
b = 117.014	β = 90
c = 68.927	γ = 120

Symmetry
Space Group	P 65 2 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	CCD	ADSC QUANTUM 4	mirrors	2003-10-23	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SRS BEAMLINE PX14.2	0.98	SRS	PX14.2

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	1.95	24.11	99.9	0.077	0.077	32.4	16.7		20787			21.2

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)
	1.95	2.06	99.9		0.391	0.391	6.6	12.3	36574

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	MOLECULAR REPLACEMENT	THROUGHOUT	pdb entry 1B4B, Trimer of C-terminal domains from B. steareothermophilus	1.95	24.11	20217	2057	97.38	0.187	0.182	0.224	RANDOM	22.466

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]
0.46	0.23		0.46		-0.7

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.818
r_dihedral_angle_3_deg	15.472
r_dihedral_angle_4_deg	13.02
r_dihedral_angle_1_deg	5.151
r_scangle_it	3.705
r_scbond_it	2.251
r_angle_refined_deg	1.415
r_mcangle_it	1.165
r_mcbond_it	0.894
r_nbtor_refined	0.311
r_nbd_refined	0.225
r_symmetry_vdw_refined	0.223
r_symmetry_hbond_refined	0.154
r_xyhbond_nbd_refined	0.123
r_chiral_restr	0.094
r_bond_refined_d	0.011
r_gen_planes_refined	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1843
Nucleic Acid Atoms
Solvent Atoms	174
Heterogen Atoms	44

Software

Software
Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing