Structure of Bace-1 (Beta-Secretase) in Complex with 6-(Thiophen-3-yl)quinolin-2-amine

Experimental Data Snapshot

  • Resolution: 2.48 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

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From Fragment Screening to In Vivo Efficacy: Optimization of a Series of 2-Aminoquinolines as Potent Inhibitors of Beta-Site Amyloid Precursor Protein Cleaving Enzyme 1 (BACE1).

Cheng, Y.Judd, T.C.Bartberger, M.D.Brown, J.Chen, K.Fremeau, R.T.Hickman, D.Hitchcock, S.A.Jordan, B.Li, V.Lopez, P.Louie, S.W.Luo, Y.Michelsen, K.Nixey, T.Powers, T.S.Rattan, C.Sickmier, E.A.St Jean, D.J.Wahl, R.C.Wen, P.H.Wood, S.

(2011) J Med Chem 54: 5836-5857

  • DOI: https://doi.org/10.1021/jm200544q
  • Primary Citation of Related Structures:  
    3RSV, 3RSX, 3RTH, 3RTM, 3RTN, 3RU1, 3RVI

  • PubMed Abstract: 

    Using fragment-based screening of a focused fragment library, 2-aminoquinoline 1 was identified as an initial hit for BACE1. Further SAR development was supported by X-ray structures of BACE1 cocrystallized with various ligands and molecular modeling studies to expedite the discovery of potent compounds. These strategies enabled us to integrate the C-3 side chain on 2-aminoquinoline 1 extending deep into the P2' binding pocket of BACE1 and enhancing the ligand's potency. We were able to improve the BACE1 potency to subnanomolar range, over 10(6)-fold more potent than the initial hit (900 μM). Further elaboration of the physical properties of the lead compounds to those more consistent with good blood-brain barrier permeability led to inhibitors with greatly improved cellular activity and permeability. Compound 59 showed an IC(50) value of 11 nM on BACE1 and cellular activity of 80 nM. This compound was advanced into rat pharmacokinetic and pharmacodynamic studies and demonstrated significant reduction of Aβ levels in cerebrospinal fluid (CSF).

  • Organizational Affiliation

    Chemistry Research and Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, USA. yuanc@amgen.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-secretase 1411Homo sapiensMutation(s): 2 
Gene Names: BACE1BACEKIAA1149
UniProt & NIH Common Fund Data Resources
Find proteins for P56817 (Homo sapiens)
Explore P56817 
Go to UniProtKB:  P56817
GTEx:  ENSG00000186318 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56817
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
RSV PDBBind:  3RSX Kd: 3.88e+4 (nM) from 1 assay(s)
BindingDB:  3RSX Kd: 3.88e+4 (nM) from 1 assay(s)
Binding MOAD:  3RSX Kd: 3.88e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.48 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.992α = 90
b = 101.992β = 90
c = 170.98γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-08-31
    Type: Initial release