4AN2

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		IN HOUSE MEK1-AMPPCP STRUCTURE

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		8.9		MEK1 (8 MG/ML) WAS INCUBATED WITH INHIBITOR (300 MICROMOLAR FINAL CONCENTRATION) AND AMPPCP (2.8 MM FINAL CONCENTRATION) FOR TWO HOURS ON ICE, FOLLOWED BY CRYSTALLIZION VS. 26.5% PEG-2000 MME, 0.1 M TRIMETHYLAMINE N- OXIDE AND 0.1 M TRIS (PH 8.9)

Crystal Properties
Matthews coefficient	Solvent content
2.32	47

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 108.844	α = 90
b = 108.844	β = 90
c = 47.71	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	ADSC QUANTUM 315r		2005-11-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 8.2.1		ALS	8.2.1

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	2.5	54.39	99.8	0.07	15.2	4.4		12819		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	2.5	2.68	99.9		0.56	2.3	4.2

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	IN HOUSE MEK1-AMPPCP STRUCTURE	2.5	94.07	10783	578	99.89	0.21493	0.21079	0.29898	RANDOM	53.06

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]
-0.5	-0.25		-0.5		0.75

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.722
r_dihedral_angle_4_deg	22.051
r_dihedral_angle_3_deg	19.513
r_dihedral_angle_1_deg	7.279
r_scangle_it	4.229
r_scbond_it	2.828
r_angle_refined_deg	2.178
r_mcangle_it	1.802
r_mcbond_it	1.016
r_nbtor_refined	0.322
r_symmetry_vdw_refined	0.278
r_nbd_refined	0.26
r_xyhbond_nbd_refined	0.197
r_symmetry_hbond_refined	0.14
r_chiral_restr	0.139
r_bond_refined_d	0.021
r_gen_planes_refined	0.007
r_metal_ion_refined	0.006
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	2209
Nucleic Acid Atoms
Solvent Atoms	38
Heterogen Atoms	62

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing