4RCE

Crystal structure of BACE1 in complex with aminooxazoline xanthene inhibitor 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

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:  

  • 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 w ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-secretase 1
A
411Homo sapiensMutation(s): 2 
Gene Names: BACE1 (BACE, KIAA1149)
EC: 3.4.23.46
Find proteins for P56817 (Homo sapiens)
Go to Gene View: BACE1
Go to UniProtKB:  P56817
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IOD
Query on IOD

Download SDF File 
Download CCD File 
A
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
3LN
Query on 3LN

Download SDF File 
Download CCD File 
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
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
3LNIC50: 2 - 25 nM (99) BINDINGDB
3LNIC50: 2 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.199 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 102.217α = 90.00
b = 102.217β = 90.00
c = 170.426γ = 120.00
Software Package:
Software NamePurpose
CrystalCleardata collection
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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