4LND

Crystal structure of human apurinic/apyrimidinic endonuclease 1 with essential Mg2+ cofactor

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	295	0.1 M MES pH 6.5, 30% (v/v) PEG 300, VAPOR DIFFUSION, SITTING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
3.08	60.05

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 165.795	α = 90
b = 90.94	β = 123.22
c = 94.03	γ = 90

Symmetry
Space Group	C 1 2 1

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	ADSC QUANTUM 315r		2012-01-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL7-1	1.03325	SSRL	BL7-1

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	1.92	69.35	85.4	0.1	3.6	2.5	75632	75632		-3

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	1.92	1.96	84.4		0.63	0.7	2.4

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	PDB ENTRY 1BIX	1.92	48	75632	71263	3746	84.38	0.2185	0.21734	0.24052	RANDOM	34.649

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]
0.58		0.91	-0.25		-0.49

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.472
r_dihedral_angle_4_deg	18.7
r_dihedral_angle_3_deg	13.49
r_dihedral_angle_1_deg	6.333
r_angle_other_deg	3.37
r_long_range_B_refined	2.846
r_long_range_B_other	2.841
r_mcangle_it	1.295
r_mcangle_other	1.294
r_angle_refined_deg	1.243
r_scangle_other	1.21
r_mcbond_it	0.783
r_mcbond_other	0.783
r_scbond_it	0.73
r_scbond_other	0.73
r_chiral_restr	0.071
r_bond_refined_d	0.008
r_gen_planes_other	0.007
r_gen_planes_refined	0.005
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6331
Nucleic Acid Atoms
Solvent Atoms	120
Heterogen Atoms	3

Software

Software
Software Name	Purpose
Blu-Ice	data collection
PHASER	phasing
REFMAC	refinement
MOSFLM	data reduction
Aimless	data scaling