4RCE

Crystal structure of BACE1 in complex with aminooxazoline xanthene inhibitor 2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.202 

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Literature

Lead Optimization and Modulation of hERG Activity in a Series of Aminooxazoline Xanthene beta-Site Amyloid Precursor Protein Cleaving Enzyme (BACE1) Inhibitors.

Epstein, O., Bryan, M.C., Cheng, A.C., Derakhchan, K., Dineen, T.A., Hickman, D., Hua, Z., Human, J.B., Kreiman, C., Marx, I.E., Weiss, M.M., Wahl, R.C., Wen, P.H., Whittington, D.A., Wood, S., Zheng, X.M., Fremeau, R.T., White, R.D., Patel, V.F.

(2014) J Med Chem 57: 9796-9810

  • DOI: 10.1021/jm501266w
  • Primary Citation of Related Structures:  
    4RCE, 4RCF

  • PubMed Abstract: 

    • The optimization of a series of aminooxazoline xanthene inhibitors of β-site amyloid precursor protein cleaving enzyme 1 (BACE1) is described. An early lead compound showed robust Aβ lowering activity in a rat pharmacodynamic model, but advancement was precluded by a low therapeutic window to QTc prolongation in cardiovascular models consistent with in vitro activity on the hERG ion channel ...

    The optimization of a series of aminooxazoline xanthene inhibitors of β-site amyloid precursor protein cleaving enzyme 1 (BACE1) is described. An early lead compound showed robust Aβ lowering activity in a rat pharmacodynamic model, but advancement was precluded by a low therapeutic window to QTc prolongation in cardiovascular models consistent with in vitro activity on the hERG ion channel. While the introduction of polar groups was effective in reducing hERG binding affinity, this came at the expense of higher than desired Pgp-mediated efflux. A balance of low Pgp efflux and hERG activity was achieved by lowering the polar surface area of the P3 substituent while retaining polarity in the P2' side chain. The introduction of a fluorine in position 4 of the xanthene ring improved BACE1 potency (5-10-fold). The combination of these optimized fragments resulted in identification of compound 40, which showed robust Aβ reduction in a rat pharmacodynamic model (78% Aβ reduction in CSF at 10 mg/kg po) and also showed acceptable cardiovascular safety in vivo.

    Organizational Affiliation: 

    Departments of Therapeutic Discovery, ‡Neuroscience, §Molecular Structure and Characterization, ∥Pharmacokinetics and Drug Metabolism, and ⊥Comparative Biology and Safety Sciences, Amgen Inc. , 360 Binney Street, Cambridge, Massachusetts 02142, One Amgen Center Drive, Thousand Oaks, California 91320, and 1120 Veterans Boulevard, South San Francisco, California 94080, United States.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-secretase 1A411Homo sapiensMutation(s): 2 
Gene Names: BACE, BACE1, KIAA1149
EC: 3.4.23.46
UniProt & NIH Common Fund Data Resources
Find proteins for P56817 (Homo sapiens)
Explore P56817 
Go to UniProtKB:  P56817
PHAROS:  P56817
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56817
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3LN
Query on 3LN
Download Ideal Coordinates CCD File 
B [auth A](4S)-2'-(2,2-dimethylpropoxy)-7'-(pyrimidin-5-yl)spiro[1,3-oxazole-4,9'-xanthen]-2-amine
C24 H24 N4 O3
CHZHWZAKWGFQNL-DEOSSOPVSA-N		 Ligand Interaction
IOD
Query on IOD
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A]		IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
3LN Binding MOAD:  4RCE IC50: 2 (nM) from 1 assay(s)
BindingDB:  4RCE IC50: min: 2, max: 25 (nM) from 3 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.202 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.217α = 90
b = 102.217β = 90
c = 170.426γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
DENZOdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-24
    Type: Initial release
  • Version 1.1: 2015-01-14
    Changes: Database references