4JPC

Spirocyclic Beta-Site Amyloid Precursor Protein Cleaving Enzyme 1 (BACE1) Inhibitors


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Spirocyclic beta-site amyloid precursor protein cleaving enzyme 1 (BACE1) inhibitors: from hit to lowering of cerebrospinal fluid (CSF) amyloid beta in a higher species.

Hunt, K.W.Cook, A.W.Watts, R.J.Clark, C.T.Vigers, G.Smith, D.Metcalf, A.T.Gunawardana, I.W.Burkard, M.Cox, A.A.Geck Do, M.K.Dutcher, D.Thomas, A.A.Rana, S.Kallan, N.C.DeLisle, R.K.Rizzi, J.P.Regal, K.Sammond, D.Groneberg, R.Siu, M.Purkey, H.Lyssikatos, J.P.Marlow, A.Liu, X.Tang, T.P.

(2013) J.Med.Chem. 56: 3379-3403

  • DOI: 10.1021/jm4002154
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • A hallmark of Alzheimer's disease is the brain deposition of amyloid beta (Aβ), a peptide of 36-43 amino acids that is likely a primary driver of neurodegeneration. Aβ is produced by the sequential cleavage of APP by BACE1 and γ-secretase; therefore, ...

    A hallmark of Alzheimer's disease is the brain deposition of amyloid beta (Aβ), a peptide of 36-43 amino acids that is likely a primary driver of neurodegeneration. Aβ is produced by the sequential cleavage of APP by BACE1 and γ-secretase; therefore, inhibition of BACE1 represents an attractive therapeutic target to slow or prevent Alzheimer's disease. Herein we describe BACE1 inhibitors with limited molecular flexibility and molecular weight that decrease CSF Aβ in vivo, despite efflux. Starting with spirocycle 1a, we explore structure-activity relationships of core changes, P3 moieties, and Asp binding functional groups in order to optimize BACE1 affinity, cathepsin D selectivity, and blood-brain barrier (BBB) penetration. Using wild type guinea pig and rat, we demonstrate a PK/PD relationship between free drug concentrations in the brain and CSF Aβ lowering. Optimization of brain exposure led to the discovery of (R)-50 which reduced CSF Aβ in rodents and in monkey.


    Organizational Affiliation

    Array BioPharma, 3200 Walnut Street, Boulder, CO 80301, USA. hunt@arraybiopharma.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-secretase 1
A
406Homo sapiensMutation(s): 0 
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
1M6
Query on 1M6

Download SDF File 
Download CCD File 
A
3-[(4R)-2'-amino-1',2,2-trimethyl-5'-oxo-1',2,3,5'-tetrahydrospiro[chromene-4,4'-imidazol]-6-yl]benzonitrile
C21 H20 N4 O2
LASIJFPKQNWUQE-OAQYLSRUSA-N
 Ligand Interaction
NI
Query on NI

Download SDF File 
Download CCD File 
A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
1M6IC50: 94 nM (100) BINDINGDB
1M6EC50: 36 nM (100) BINDINGDB
1M6IC50: 94 nM BINDINGMOAD
1M6IC50: 94 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.185 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 74.981α = 90.00
b = 104.014β = 90.00
c = 100.220γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-10-23
    Type: Database references