3TEM

Quinone Oxidoreductase (NQ02) bound to the imidazoacridin-6-one 6a1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.150 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Novel Inhibitors of NRH:Quinone Oxidoreductase 2 (NQO2): Crystal Structures, Biochemical Activity, and Intracellular Effects of Imidazoacridin-6-ones.

Dunstan, M.S.Barnes, J.Humphries, M.Whitehead, R.C.Bryce, R.A.Leys, D.Stratford, I.J.Nolan, K.A.

(2011) J Med Chem 54: 6597-6611

  • DOI: https://doi.org/10.1021/jm200416e
  • Primary Citation of Related Structures:  
    3TE7, 3TEM

  • PubMed Abstract: 

    Imidazoacridin-6-ones are shown to be potent nanomolar inhibitors of the enzyme NQO2. By use of computational molecular modeling, a reliable QSAR was established, relating inhibitory potency with calculated binding affinity. Further, crystal structures of NQO2 containing two of the imidazoacridin-6-ones have been solved. To generate compounds with reduced off-target (DNA binding) effects, an N-oxide moiety was introduced into the tertiary aminoalkyl side chain of the imidazoacridin-6-ones. This resulted in substantially less toxicity in a panel of eight cancer cell lines, decreased protein binding, and reduced DNA binding and nuclear accumulation. Finally, one of the N-oxides showed potent ability to inhibit the enzymatic function of NQO2 in cells, and therefore, it may be useful as a pharmacological probe to study the properties of the enzyme in vitro and in vivo.


  • Organizational Affiliation

    Manchester Interdisciplinary Biocentre, University of Manchester and Manchester Cancer Research Centre, Manchester M13 9PT, U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribosyldihydronicotinamide dehydrogenase [quinone]
A, B
228Homo sapiensMutation(s): 0 
Gene Names: NQO2NMOR2
EC: 1.10.99.2 (PDB Primary Data), 1.10.5.1 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P16083 (Homo sapiens)
Explore P16083 
Go to UniProtKB:  P16083
PHAROS:  P16083
GTEx:  ENSG00000124588 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16083
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
D [auth A],
I [auth B]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
6A1
Query on 6A1

Download Ideal Coordinates CCD File 
E [auth A],
G [auth B]
hydroxy(2-{[(5S)-6-hydroxy-8-methoxy-4,5-dihydro-3H-imidazo[4,5,1-de]acridin-5-yl]amino}ethyl)dimethylammonium
C19 H25 N4 O3
VTPADFJSUDVABF-AWEZNQCLSA-O
IMD
Query on IMD

Download Ideal Coordinates CCD File 
F [auth A]IMIDAZOLE
C3 H5 N2
RAXXELZNTBOGNW-UHFFFAOYSA-O
ZN
Query on ZN

Download Ideal Coordinates CCD File 
C [auth A],
H [auth B]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.150 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.764α = 90
b = 83.571β = 90
c = 106.281γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-21
    Type: Initial release
  • Version 1.1: 2011-10-05
    Changes: Database references
  • Version 1.2: 2011-10-19
    Changes: Database references
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations