3EPI

Structure of Human DNA Polymerase Iota complexed with N2-ethylguanine and incoming TTP

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2ALZ	2ALZ minus DNA

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	277.15	12-15% PEG MME 5000, 0.2-0.4M Ammonium Sulfate, 0.1M MES, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K

Crystal Properties
Matthews coefficient	Solvent content
2.45	49.71

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 98.643	α = 90
b = 98.643	β = 90
c = 202.231	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	RIGAKU SATURN 92		2007-04-30	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU MICROMAX-007	1.5418

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	2.9	14.99	100	0.144	11.8	27.44	13417	13417

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	2.9	3	100		0.323	4	26.36

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	2ALZ minus DNA	2.9	14.99	12753	663	98.93	0.23858	0.23632	0.28203	RANDOM	14.723

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]
0.7	0.35		0.7		-1.05

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	41.523
r_dihedral_angle_4_deg	20.935
r_dihedral_angle_3_deg	19.458
r_dihedral_angle_1_deg	6.269
r_scangle_it	1.623
r_angle_refined_deg	1.532
r_scbond_it	0.977
r_mcangle_it	0.714
r_mcbond_it	0.372
r_symmetry_vdw_refined	0.337
r_nbtor_refined	0.303
r_nbd_refined	0.225
r_xyhbond_nbd_refined	0.155
r_symmetry_hbond_refined	0.148
r_chiral_restr	0.118
r_metal_ion_refined	0.02
r_bond_refined_d	0.01
r_gen_planes_refined	0.004
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2905
Nucleic Acid Atoms	310
Solvent Atoms	69
Heterogen Atoms	6

Software

Software
Software Name	Purpose
CrystalClear	data collection
PHASER	phasing
REFMAC	refinement
d*TREK	data reduction
d*TREK	data scaling