3OX3

X-ray Structural study of quinone reductase II inhibition by compounds with micromolar to nanomolar range IC50 values


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

X-ray structural studies of quinone reductase 2 nanomolar range inhibitors.

Pegan, S.D.Sturdy, M.Ferry, G.Delagrange, P.Boutin, J.A.Mesecar, A.D.

(2011) Protein Sci 20: 1182-1195

  • DOI: 10.1002/pro.647
  • Primary Citation of Related Structures:  
    3OVM, 3OWX, 3OX1, 3OX2, 3OX3, 3OWH

  • PubMed Abstract: 
  • Quinone reductase 2 (QR2) is one of two members comprising the mammalian quinone reductase family of enzymes responsible for performing FAD mediated reductions of quinone substrates. In contrast to quinone reductase 1 (QR1) which uses NAD(P)H as its co-substrate, QR2 utilizes a rare group of hydride donors, N-methyl or N-ribosyl nicotinamide ...

    Quinone reductase 2 (QR2) is one of two members comprising the mammalian quinone reductase family of enzymes responsible for performing FAD mediated reductions of quinone substrates. In contrast to quinone reductase 1 (QR1) which uses NAD(P)H as its co-substrate, QR2 utilizes a rare group of hydride donors, N-methyl or N-ribosyl nicotinamide. Several studies have linked QR2 to the generation of quinone free radicals, several neuronal degenerative diseases, and cancer. QR2 has been also identified as the third melatonin receptor (MT3) through in cellulo and in vitro inhibition of QR2 by traditional MT3 ligands, and through recent X-ray structures of human QR2 (hQR2) in complex with melatonin and 2-iodomelatonin. Several MT3 specific ligands have been developed that exhibit both potent in cellulo inhibition of hQR2 nanomolar, affinity for MT3. The potency of these ligands suggest their use as molecular probes for hQR2. However, no definitive correlation between traditionally obtained MT3 ligand affinity and hQR2 inhibition exists limiting our understanding of how these ligands are accommodated in the hQR2 active site. To obtain a clearer relationship between the structures of developed MT3 ligands and their inhibitory properties, in cellulo and in vitro IC₅₀ values were determined for a representative set of MT3 ligands (MCA-NAT, 2-I-MCANAT, prazosin, S26695, S32797, and S29434). Furthermore, X-ray structures for each of these ligands in complex with hQR2 were determined allowing for a structural evaluation of the binding modes of these ligands in relation to the potency of MT3 ligands.


    Organizational Affiliation

    Department of Chemistry & Biochemistry, University of Denver, Denver, Colorado 80208, USA. spegan@du.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ribosyldihydronicotinamide dehydrogenase [quinone]A, B231Homo 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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD (Subject of Investigation/LOI)
Query on FAD

Download Ideal Coordinates CCD File 
D [auth A], G [auth B]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
4X4 (Subject of Investigation/LOI)
Query on 4X4

Download Ideal Coordinates CCD File 
E [auth A], H [auth B]N-[2-(2-methoxy-1H-dipyrido[2,3-a:3',2'-e]pyrrolizin-11-yl)ethyl]furan-2-carboxamide
C21 H18 N4 O3
WIMLBKFZRMRSHL-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
C [auth A], F [auth B]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
4X4 Binding MOAD:  3OX3 IC50: 11 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.421α = 90
b = 83.607β = 90
c = 106.407γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-05-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description