Experiment: 5A8I

Crystal structure of the FHA domain of ArnA from Sulfolobus acidocaldarius

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2FF4	PDB ENTRY 2FF4

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1				RESERVOIR BUFFER: 0.1 M HEPES PH 7.5; 1.5 M LI2SO4 PROTEIN BUFFER: 20 MM TRIS PH 8.0; 100 MM NACL 3.5 MG/ML PROTEIN IN PROTEIN BUFFER MIX RESERVOIR AND PROTEIN 1:1

Crystal Properties
Matthews coefficient	Solvent content
2.54	51.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 43.57	α = 90
b = 43.57	β = 90
c = 71.83	γ = 90

Symmetry
Space Group	P 43

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		2012-03-08	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	BESSY BEAMLINE 14.1		BESSY	14.1

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	1.75	30.81	99.6	0.03	21.95	4.18		13490		-3	24.82

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	1.75	1.84	99.6		0.52	1.45	4.24

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	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)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	PDB ENTRY 2FF4	1.75	30.809	13488	685	99.54	0.1686	0.1675	0.1713	0.1893	0.1941	25.77

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	13.118
f_angle_d	1.002
f_chiral_restr	0.06
f_bond_d	0.005
f_plane_restr	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	939
Nucleic Acid Atoms
Solvent Atoms	120
Heterogen Atoms	22

Software

Software
Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
CCP4	phasing