3I6U

Structure and Activation Mechanism of the CHK2 DNA-Damage Checkpoint Kinase

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1GXC	1GXC, 1A06
experimental model	PDB	1A06	1GXC, 1A06

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	295	1:1 ratio mix of protein solution (~12 mg/ml protein in 20 mM Tris-HCl, 150 mM NaCl, 10 mM dithiothreitol (DTT), 3% (v/v) glycerol, pH 8.0and well bifffer ( 50 mM Na2SO4 Sulfate, 14% (w/v) PEG 3350). Crystals were flash frozen in crystallization buffer supplemented with 16-20 % (v/v) glycerol., VAPOR DIFFUSION, HANGING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
2.57	52.09

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 123.9	α = 90
b = 152.2	β = 90
c = 52.4	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		CCD	ADSC QUANTUM 315		2006-03-03	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-E		APS	24-ID-E

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym 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	3	30	98.3	0.051		4.96		20144

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	1GXC, 1A06	3	12	17738	1493	95.2	0.247	0.244	0.28	RANDOM	56.81

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]
-0.98			0.09		0.89

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	38.12
r_dihedral_angle_4_deg	22.363
r_dihedral_angle_3_deg	20.389
r_dihedral_angle_1_deg	5.856
r_scangle_it	4.301
r_mcangle_it	2.914
r_scbond_it	2.72
r_mcbond_it	1.701
r_angle_refined_deg	1.24
r_symmetry_hbond_refined	0.359
r_nbtor_refined	0.31
r_symmetry_vdw_refined	0.295
r_nbd_refined	0.223
r_xyhbond_nbd_refined	0.139
r_chiral_restr	0.088
r_bond_refined_d	0.01
r_gen_planes_refined	0.003
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_refined
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	6227
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement