4AN3

Crystal structures of human MEK1 with carboxamide-based allosteric inhibitor XL518 (GDC-0973), or related analogs.

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
other		UNPUBLISHED MEK1-ATP STRUCTURE

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.9		SITTING DROP VAPOR DIFFUSION VS. 26.5 % PEG-2000 MME, 0.1 M TRIMETHYLAMINE N-OXIDE, 0.1 M TRIS (PH 8.9)

Crystal Properties
Matthews coefficient	Solvent content
2.32	47

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 108.659	α = 90
b = 108.659	β = 90
c = 50.113	γ = 120

Symmetry
Space Group	P 61

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	MARMOSAIC 325 mm CCD	MIRRORS	2005-03-31	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL11-1		SSRL	BL11-1

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	2.1	44.23	99.5	0.07	8.1	3.2		19901		2

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	2.1	2.18	100		0.46	2.2	3.2

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X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	UNPUBLISHED MEK1-ATP STRUCTURE	2.1	44.22	18755	1021	99.37	0.22865	0.22574	0.28311	RANDOM	44.537

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]
-1.99	-0.99		-1.99		2.98

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.931
r_dihedral_angle_4_deg	18.065
r_dihedral_angle_3_deg	17.791
r_dihedral_angle_1_deg	7.106
r_scangle_it	4.385
r_scbond_it	3.035
r_angle_refined_deg	2.1
r_mcangle_it	1.861
r_mcbond_it	1.105
r_nbtor_refined	0.315
r_symmetry_vdw_refined	0.264
r_nbd_refined	0.249
r_xyhbond_nbd_refined	0.209
r_symmetry_hbond_refined	0.191
r_chiral_restr	0.13
r_metal_ion_refined	0.038
r_bond_refined_d	0.02
r_gen_planes_refined	0.008
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_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2191
Nucleic Acid Atoms
Solvent Atoms	88
Heterogen Atoms	58

Software

Software
Software Name	Purpose
REFMAC	refinement
d*TREK	data reduction
d*TREK	data scaling
MOLREP	phasing