3EQC

X-ray structure of the human mitogen-activated protein kinase kinase 1 (MEK1) in a ternary complex with compound 1, ATP-GS AND MG2P

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	281	0.1M TRIS-CL, pH 8.0; 18% PEG 4000; 0.2M CALCIUM CHLORIDE; 3% DMSO, VAPOR DIFFUSION HANGING DROP, temperature 281K

Crystal Properties
Matthews coefficient	Solvent content
2.38	48.37

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 77.22	α = 90
b = 77.22	β = 90
c = 222.05	γ = 120

Symmetry
Space Group	P 61 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					M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 17-ID	1.0	APS	17-ID

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	1.8	50	99.2	0.056	12.9			38811

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	1.8	1.83	99.5		0.656			1813

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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		THROUGHOUT	1.8	50	38811	1818	98.95	0.201	0.199	0.235	RANDOM	43.6

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]
-5.975			-5.975		11.95

RMS Deviations
Key	Refinement Restraint Deviation
t_dihedral_angle_d	19.952
t_it	1.856
t_angle_deg	1.175
t_nbd	0.042
t_gen_planes	0.017
t_bond_d	0.01
t_trig_c_planes	0.01
IMPROPER ANGLES (DEGREES)
t_pseud_angle

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2438
Nucleic Acid Atoms
Solvent Atoms	184
Heterogen Atoms	60

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
TNT	refinement
PDB_EXTRACT	data extraction
BUSTER-TNT	refinement

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.