2VA6

X-ray crystal structure of beta secretase complexed with compound 24


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.228 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Application of Fragment-Based Lead Generation to the Discovery of Novel, Cyclic Amidine Beta-Secretase Inhibitors with Nanomolar Potency, Cellular Activity, and High Ligand Efficiency.

Edwards, P.D.Albert, J.S.Sylvester, M.Aharony, D.Andisik, D.Callaghan, O.Campbell, J.B.Carr, R.A.Chessari, G.Congreve, M.Frederickson, M.Folmer, R.H.A.Geschwindner, S.Koether, G.Kolmodin, K.Krumrine, J.Mauger, R.C.Murray, C.W.Olsson, L.L.Patel, S.Spear, N.Tian, G.

(2007) J Med Chem 50: 5912

  • DOI: 10.1021/jm070829p
  • Primary Citation of Related Structures:  
    2VA5, 2VA6, 2VA7

  • PubMed Abstract: 
  • Fragment-based lead generation has led to the discovery of a novel series of cyclic amidine-based inhibitors of beta-secretase (BACE-1). Initial fragment hits with an isocytosine core having millimolar potency were identified via NMR affinity screening ...

    Fragment-based lead generation has led to the discovery of a novel series of cyclic amidine-based inhibitors of beta-secretase (BACE-1). Initial fragment hits with an isocytosine core having millimolar potency were identified via NMR affinity screening. Structure-guided evolution of these fragments using X-ray crystallography together with potency determination using surface plasmon resonance and functional enzyme inhibition assays afforded micromolar inhibitors. Similarity searching around the isocytosine core led to the identification of a related series of inhibitors, the dihydroisocytosines. By leveraging the knowledge of the ligand-BACE-1 recognition features generated from the isocytosines, the dihydroisocytosines were efficiently optimized to submicromolar potency. Compound 29, with an IC50 of 80 nM, a ligand efficiency of 0.37, and cellular activity of 470 nM, emerged as the lead structure for future optimization.


    Organizational Affiliation

    CNS Discovery Research, AstraZeneca Pharmaceuticals LP, 1800 Concord Pike, Wilmington, DE 19850-5437, USA. philip.edwards@astrazeneca.com



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA SECRETASE 1A455Homo sapiensMutation(s): 2 
Gene Names: BACE1BACEKIAA1149
EC: 3.4.23.46
Find proteins for P56817 (Homo sapiens)
Explore P56817 
Go to UniProtKB:  P56817
NIH Common Fund Data Resources
PHAROS  P56817
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
H24
Query on H24

Download Ideal Coordinates CCD File 
A
(6S)-2-amino-6-(3'-methoxybiphenyl-3-yl)-3,6-dimethyl-5,6-dihydropyrimidin-4(3H)-one
C19 H21 N3 O2
LQOCXPOKEPYGTJ-IBGZPJMESA-N
 Ligand Interaction
IOD
Query on IOD

Download Ideal Coordinates CCD File 
A
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
H24IC50:  590   nM  BindingDB
H24IC50:  670   nM  BindingDB
H24IC50 :  670   nM  PDBBind
H24IC50:  91000   nM  BindingDB
H24IC50:  590   nM  Binding MOAD
H24IC50:  380   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.228 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.971α = 90
b = 102.971β = 90
c = 167.28γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
C-SEARCHphasing

Structure Validation

View Full Validation Report



Entry History 

Revision History 

  • Version 1.0: 2007-11-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance