6HMB

STRUCTURE OF PROTEIN KINASE CK2 CATALYTIC SUBUNIT (ISOFORM CK2ALPHA'; CSNK2A2 Gene product) IN COMPLEX WITH the inhibitor CX-4945 (Silmitasertib)

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.5	293.15	180 MICROLITER ENZYME STOCK SOLUTION (6 MG/ML IN 500 MM NACL, 25 MM TRIS/HCL, PH 8.5) WERE MIXED and incubated WITH 20 MIKROLITER of a STOCK SOLUTION of the inhibitor 4B0 (10 MM 4B0 IN DMSO). 20 MICROLITERS OF the resulting solution WERE MIXED WITH 10 MICROLITERS OF RESERVOIR SOLUTION (900 MM LICL, 28 % (W/V) PEG 6000, 100 MM TRIS/HCL, PH 8.5) IN EACH WELL OF A CRYSTALLIZATION PLATE. A SINGLE MACROSEED, grown UNDER THE SAME CONDITIONS, WAS ADDED TO EACH DROPLET of the plate. THE DROPLETS WERE EQUILIBRATED AT 293.15 K using the sitting drop variant of the VAPOR DIFFUSION method. This procedure generated large single crystals of a CK2alpha'/4B0 complex. Afterwards, the inhibitor 4B0 was exchanged against CX-4945 by an extensive soaking procedure of several steps.

Crystal Properties
Matthews coefficient	Solvent content
2.49	50.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.35	α = 113.08
b = 47.72	β = 90.28
c = 50.42	γ = 90.85

Symmetry
Space Group	P 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	PIXEL	DECTRIS PILATUS3 S 6M		2018-07-16	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID30B	0.8	ESRF	ID30B

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	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	1.04	32.75	98.33	0.071	0.071	0.07737	0.03009	0.998	11.75	6.5		187923			11.53

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.04	1.077	96.75		1.286	1.286	1.398	0.5406	0.576	1.5	6.4

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	AB INITIO PHASING	FREE R-VALUE	1.04	32.592	1.93	187814	1877	98.31	0.1345	0.1343	0.1463

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]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	19.178
f_angle_d	1.18
f_chiral_restr	0.087
f_bond_d	0.009
f_plane_restr	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2768
Nucleic Acid Atoms
Solvent Atoms	448
Heterogen Atoms	67

Software

Software
Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
Arcimboldo	phasing
ARP/wARP	model building

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.