Crystal Structure of BACE with Compound 8

Experimental Data Snapshot

  • Resolution: 1.94 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 

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Discovery and optimization of a novel spiropyrrolidine inhibitor of {beta}-secretase (BACE1) through fragment-based drug design.

Efremov, I.V.Vajdos, F.F.Borzilleri, K.A.Capetta, S.Chen, H.Dorff, P.H.Dutra, J.K.Goldstein, S.W.Mansour, M.McColl, A.Noell, S.Oborski, C.E.O'Connell, T.N.O'Sullivan, T.J.Pandit, J.Wang, H.Wei, B.Withka, J.M.

(2012) J Med Chem 55: 9069-9088

  • DOI: https://doi.org/10.1021/jm201715d
  • Primary Citation of Related Structures:  
    3UDH, 3UDJ, 3UDK, 3UDM, 3UDN, 3UDP, 3UDQ, 3UDR, 3UDY

  • PubMed Abstract: 

    The aspartyl protease β-secretase, or BACE, has been demonstrated to be a key factor in the proteolytic formation of Aβ-peptide, a major component of plaques in the brains of Alzheimer's disease (AD) patients, and inhibition of this enzyme has emerged as a major strategy for pharmacologic intervention in AD. An X-ray-based fragment screen of Pfizer's proprietary fragment collection has resulted in the identification of a novel BACE binder featuring spiropyrrolidine framework. Although exhibiting only weak inhibitory activity against the BACE enzyme, the small compound was verified by biophysical and NMR-based methods as a bona fide BACE inhibitor. Subsequent optimization of the lead compound, relying heavily on structure-based drug design and computational prediction of physiochemical properties, resulted in a nearly 1000-fold improvement in potency while maintaining ligand efficiency and properties predictive of good permeability and low P-gp liability.

  • Organizational Affiliation

    Pfizer Worldwide Research, Groton Laboratories, Eastern Point Road, Groton, Connecticut 06340, United States. ivan.efremov@pfizer.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-secretase 1404Homo sapiensMutation(s): 0 
Gene Names: BACE1BACEKIAA1149
UniProt & NIH Common Fund Data Resources
Find proteins for P56817 (Homo sapiens)
Explore P56817 
Go to UniProtKB:  P56817
PHAROS:  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
09A BindingDB:  3UDM IC50: min: 3.30e+4, max: 8.57e+4 (nM) from 2 assay(s)
Binding MOAD:  3UDM IC50: 3.30e+4 (nM) from 1 assay(s)
PDBBind:  3UDM IC50: 3.30e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.94 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.771α = 90
b = 103.571β = 90
c = 99.048γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2012-04-18
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Refinement description