4I0H

SPR and structural analysis yield insight towards mechanism of inhibition of BACE inhibitors.

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	5.3	291	Human BACE protein containing residues 57-453 and a C-terminal 6His-tag was concentrated to 6mg/ml in buffer 0.1M borate pH 8.5. Compound was added to give a final molar access of compound:protein of 8:1. Protein and compound were then incubated on ice for 1 hour. The drops were set up with a 1:1(v/v) ratio of protein to mother liquor in a total volume of 2 ul. Diffraction quality crystals of BACE in complex with compound was obtained by sitting-drop vapor diffusion method at 291K against a reservoir containing 0.1 M sodium acetate, 2% PEG8000, VAPOR DIFFUSION, SITTING DROP

Crystal Properties
Matthews coefficient	Solvent content
3.12	60.51

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 83.201	α = 90
b = 105.467	β = 105.11
c = 100.265	γ = 90

Symmetry
Space Group	P 1 21 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	IMAGE PLATE	RIGAKU RAXIS HTC		2010-01-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU MICROMAX-007 HF	1.5418

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	60	97			84800	87435	1	1

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	MOLECULAR REPLACEMENT	THROUGHOUT	2.2	60	79824	4201	99.09	0.21961	0.21703	0.2667	RANDOM	67.888

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		-1.43	1.5		-1.75

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.642
r_dihedral_angle_4_deg	20.653
r_dihedral_angle_3_deg	17.585
r_dihedral_angle_1_deg	8.107
r_scangle_it	4.428
r_scbond_it	2.834
r_angle_refined_deg	2.019
r_mcangle_it	2.007
r_mcbond_it	1.114
r_chiral_restr	0.142
r_bond_refined_d	0.022
r_gen_planes_refined	0.01
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8833
Nucleic Acid Atoms
Solvent Atoms	299
Heterogen Atoms	120

Software

Software
Software Name	Purpose
CrystalClear	data collection
MOLREP	phasing
REFMAC	refinement
CrystalClear	data reduction
CrystalClear	data scaling