4CF6

Crystal structure of the complex of the P187S variant of human NAD(P) H:quinone oxidoreductase with Cibacron blue at 2.7 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Collapse of the Native Structure by a Single Amino Acid Exchange in Human Nad(P)H:Quinone Oxidoreductase (Nqo1).

Lienhart, W.D.Gudipati, V.Uhl, M.K.Binter, A.Pulido, S.Saf, R.Zangger, K.Gruber, K.Macheroux, P.

(2014) FEBS J 281: 4691

  • DOI: https://doi.org/10.1111/febs.12975
  • Primary Citation of Related Structures:  
    4CET, 4CF6

  • PubMed Abstract: 

    Human quinone oxidoreductase 1 (NQO1) is essential for the antioxidant defense system, stabilization of tumor suppressors (e.g. p53, p33, and p73), and activation of quinone-based chemotherapeutics. Overexpression of NQO1 in many solid tumors, coupled with its ability to convert quinone-based chemotherapeutics into potent cytotoxic compounds, have made it a very attractive target for anticancer drugs. A naturally occurring single-nucleotide polymorphism (C609T) leading to an amino acid exchange (P187S) has been implicated in the development of various cancers and poor survival rates following anthracyclin-based adjuvant chemotherapy. Despite its importance for cancer prediction and therapy, the exact molecular basis for the loss of function in NQO1 P187S is currently unknown. Therefore, we solved the crystal structure of NQO1 P187S. Surprisingly, this structure is almost identical to NQO1. Employing a combination of NMR spectroscopy and limited proteolysis experiments, we demonstrated that the single amino acid exchange destabilized interactions between the core and C-terminus, leading to depopulation of the native structure in solution. This collapse of the native structure diminished cofactor affinity and led to a less competent FAD-binding pocket, thus severely compromising the catalytic capacity of the variant protein. Hence, our findings provide a rationale for the loss of function in NQO1 P187S with a frequently occurring single-nucleotide polymorphism. Structural data are available in the Protein Data Bank under the accession numbers 4cet (P187S variant with dicoumarol) and 4cf6 (P187S variant with Cibacron blue). NQO1 P187S and NQO1 P187S bind by nuclear magnetic resonance (View interaction) NQO1 P187S and NQO1 P187S bind by x-ray crystallography (1, 2) NQO1 and NQO1 bind by molecular sieving (1, 2).


  • Organizational Affiliation

    Institute of Biochemistry, Graz University of Technology, Austria.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NAD(P)H DEHYDROGENASE [QUINONE] 1
A, B
294Homo sapiensMutation(s): 1 
EC: 1.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P15559 (Homo sapiens)
Explore P15559 
Go to UniProtKB:  P15559
PHAROS:  P15559
GTEx:  ENSG00000181019 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15559
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.167α = 90
b = 104.563β = 90
c = 118.566γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata 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: 2014-08-27
    Type: Initial release
  • Version 1.1: 2014-09-03
    Changes: Database references
  • Version 1.2: 2014-10-29
    Changes: Database references
  • Version 1.3: 2017-09-27
    Changes: Data collection
  • Version 1.4: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description