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 

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Ligand Structure Quality Assessment 


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: https://doi.org/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. 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 ...

    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)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA SECRETASE 1A455Homo sapiensMutation(s): 2 
Gene Names: BACE1, BACE, KIAA1149
EC: 3.4.23.46
UniProt & NIH Common Fund Data Resources
Find proteins for P56817 (Homo sapiens)
Explore P56817 
Go to UniProtKB:  P56817
PHAROS:  P56817
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56817
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 
E [auth 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 
B [auth A],
C [auth A],
D [auth A]		IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
H24 BindingDB:  2VA6 IC50: min: 380, max: 9.10e+4 (nM) from 4 assay(s)
PDBBind:  2VA6 IC50: 670 (nM) from 1 assay(s)
Binding MOAD:  2VA6 IC50: 670 (nM) from 1 assay(s)
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

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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