4INB

Crystal Structure of the N-Terminal Domain of HIV-1 Capsid in Complex With benzodiazepine Inhibitor

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.231 

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This is version 1.1 of the entry. See complete history. 


Literature

Monitoring Binding of HIV-1 Capsid Assembly Inhibitors Using (19) F Ligand-and (15) N Protein-Based NMR and X-ray Crystallography: Early Hit Validation of a Benzodiazepine Series.

Goudreau, N., Coulombe, R., Faucher, A.M., Grand-Maitre, C., Lacoste, J.E., Lemke, C.T., Malenfant, E., Bousquet, Y., Fader, L., Simoneau, B., Mercier, J.F., Titolo, S., Mason, S.W.

(2013) ChemMedChem 8: 405-414

  • DOI: 10.1002/cmdc.201200580
  • Primary Citation of Related Structures:  
    4INB

  • PubMed Abstract: 

    • The emergence of resistance to existing classes of antiretroviral drugs underlines the need to find novel human immunodeficiency virus (HIV)-1 targets for drug discovery. The viral capsid protein (CA) represents one such potential target. Recently, a ser ...

    The emergence of resistance to existing classes of antiretroviral drugs underlines the need to find novel human immunodeficiency virus (HIV)-1 targets for drug discovery. The viral capsid protein (CA) represents one such potential target. Recently, a series of benzodiazepine inhibitors was identified via high-throughput screening using an in vitro capsid assembly assay (CAA). Here, we demonstrate how a combination of NMR and X-ray co-crystallography allowed for the rapid characterization of the early hits from this inhibitor series. Ligand-based (19)F NMR was used to confirm inhibitor binding specificity and reversibility as well as to identify the N-terminal domain of the capsid (CA(NTD)) as its molecular target. Protein-based NMR ((1)H and (15)N chemical shift perturbation analysis) identified key residues within the CA(NTD) involved in inhibitor binding, while X-ray co-crystallography confirmed the inhibitor binding site and its binding mode. Based on these results, two conformationally restricted cyclic inhibitors were designed to further validate the possible binding modes. These studies were crucial to early hit confirmation and subsequent lead optimization.

    Organizational Affiliation: 

    Dept. of Chemistry and Biological Sciences, Research & Development, Boehringer Ingelheim (Canada) Ltd, 2100 Cunard Street, Laval, Québec, H7S 2G5, Canada. nathalie.goudreau@boehringer-ingelheim.com



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gag protein A146Human immunodeficiency virus 1Mutation(s): 0 
Gene Names: gag
Find proteins for A9PKC6 (Human immunodeficiency virus 1)
Explore A9PKC6 
Go to UniProtKB:  A9PKC6
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1F6
Query on 1F6
Download Ideal Coordinates CCD File 
A
(3Z)-3-{[(2-methoxyethyl)amino]methylidene}-1-methyl-5-phenyl-7-(trifluoromethyl)-1H-1,5-benzodiazepine-2,4(3H,5H)-dione
C21 H20 F3 N3 O3
ZVVPSWCRCLQQOH-SSZFMOIBSA-N		 Ligand Interaction
NA
Query on NA
Download Ideal Coordinates CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
1F6IC50:  890   nM  Binding MOAD
1F6IC50 :  890   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.231 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.95α = 90
b = 89.21β = 90
c = 39.27γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
CNSrefinement
CNXrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2013-01-04 
  • Released Date: 2013-02-27 
    • Deposition Author(s): Coulombe, R.

Revision History 

  • Version 1.0: 2013-02-27
    Type: Initial release
  • Version 1.1: 2013-03-13
    Changes: Database references