Experiment: 8XB7

HosA transcriptional regulator from enteropathogenic Escherichia coli O127:H6 (strain E2348/69) bound with 4-hydroxy benzoic acid - Conformation II at 2.6 angstrom resolution

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	8PQ4	HosA apoprotein model was used as template for molecular replacement.

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICROBATCH	6.2	277.15	Sodium phosphate dibasic/ Potassium phosphate monobasic, Sodium chloride, PEG 200

Crystal Properties
Matthews coefficient	Solvent content
3.17	61.19

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 66.64	α = 90
b = 66.64	β = 90
c = 94.49	γ = 90

Symmetry
Space Group	P 43 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	IMAGE PLATE	RIGAKU RAXIS IV++	Tube	2023-09-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU FR-E+ SUPERBRIGHT	1.541870

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	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	2.6	66.64	99.6	0.084	0.092	0.036	0.998	16.1	6.1		6948			35.5317

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.6	2.74	99		0.435	0.475	0.188	0.839	4.4	6.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	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	FREE R-VALUE	8PQ4	2.6	54.46	1.38	6935	692	99.38	0.2075	0.203	0.2035	0.2487	0.2475	Random selection	40.92

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]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	4.211
f_angle_d	0.528
f_chiral_restr	0.034
f_plane_restr	0.004
f_bond_d	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1058
Nucleic Acid Atoms
Solvent Atoms	13
Heterogen Atoms	10

Software

Software
Software Name	Purpose
PHENIX	refinement
SCALA	data scaling
iMOSFLM	data reduction
PHASER	phasing