4RG8

Structural and biochemical studies of a moderately thermophilic Exonuclease I from Methylocaldum szegediense

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8	298	20% PEG6K, 0.1 M Tris pH8, 0.2 M calcium chloride , VAPOR DIFFUSION, SITTING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.78	55.75

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 60.967	α = 90
b = 97.02	β = 90
c = 111.411	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100					M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	DIAMOND BEAMLINE I02	0.9795	Diamond	I02

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.12	29.08	99.22			36277	36277	2	2

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.12	2.17	94.92

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 (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1FXX	2.12	29.08	36277	1912	99.22	0.22278	0.22433	0.22278	0.25292	RANDOM	49.365

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]
-0.34			0.44		-0.1

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.702
r_dihedral_angle_3_deg	14.626
r_dihedral_angle_4_deg	14.239
r_dihedral_angle_1_deg	5.324
r_long_range_B_refined	4.959
r_long_range_B_other	4.804
r_scangle_other	2.755
r_mcangle_it	2.624
r_mcangle_other	2.623
r_scbond_it	1.596
r_scbond_other	1.596
r_mcbond_it	1.555
r_mcbond_other	1.555
r_angle_refined_deg	1.029
r_angle_other_deg	0.741
r_chiral_restr	0.059
r_bond_refined_d	0.005
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	3768
Nucleic Acid Atoms
Solvent Atoms	189
Heterogen Atoms	1

Software

Software
Software Name	Purpose
PHASER	phasing
REFMAC	refinement
xia2	data reduction
xia2	data scaling