Experiment: 4DSN

Small-molecule ligands bind to a distinct pocket in Ras and inhibit SOS-mediated nucleotide exchange activity

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.5	277	0.2 uL + 0.2 uL drops containing 40 mg/mL KRas, 0.1 M TrisCl, 25% polyethylene glycol 4000, 0.2 M NaOAc, 2% benzamidine-HCl, pH 8.5, VAPOR DIFFUSION, SITTING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.14	42.46

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 78.638	α = 90
b = 78.638	β = 90
c = 77.353	γ = 120

Symmetry
Space Group	H 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	93	CCD	ADSC QUANTUM 315		2010-05-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL7-1	0.97946	SSRL	BL7-1

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	2.03	50	99.8	0.065	26.8	5.5		11523	1	1	31.8

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.03	2.12			0.461	3	5	1123

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	2.03	25.558	1.98	11999	11431	568	98.71	0.1667	0.1646	0.1659	0.2059	0.1668	5%

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]
-6.6449			-6.6449		13.2898

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	15.161
f_angle_d	1.021
f_chiral_restr	0.059
f_bond_d	0.005
f_plane_restr	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1417
Nucleic Acid Atoms
Solvent Atoms	66
Heterogen Atoms	42

Software

Software
Software Name	Purpose
Blu-Ice	data collection
PHASER	phasing
PHENIX	refinement
HKL-2000	data reduction
SCALEPACK	data scaling