1Q3B

Crystal structure of the DNA repair enzyme endonuclease-VIII (Nei) from E. coli: The R252A mutant at 2.05 resolution.

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1K3W	The Protein chain from PDB code 1K3W

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.4	288	35% PEG 400, 0.1M Tris-HCl pH 8.4, 0.2M MgCl2, VAPOR DIFFUSION, HANGING DROP, temperature 288K

Crystal Properties
Matthews coefficient	Solvent content
3.29	62.59

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.722	α = 90
b = 80.051	β = 90
c = 169.311	γ = 90

Symmetry
Space Group	I 2 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	MAR CCD 165 mm		2001-12-22	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 5ID-B	1.102	APS	5ID-B

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	2.05	30	99.9	0.06		5.43	25032	25032			25.9

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	2.05	2.09	100		0.421		5	1220

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	The Protein chain from PDB code 1K3W	2.05	29.21	25032	25024	2095	99.7	0.228	0.228	0.26	RANDOM	45.3

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]
-13.87			22.45		-8.58

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	23.7
c_scangle_it	3.03
c_mcangle_it	2.19
c_scbond_it	2.04
c_mcbond_it	1.37
c_angle_deg	1.2
c_improper_angle_d	0.79
c_bond_d	0.006

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2068
Nucleic Acid Atoms
Solvent Atoms	133
Heterogen Atoms	9

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.