8AJX

E. coli NfsA with Fumarate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.133 
  • R-Value Work: 0.106 
  • R-Value Observed: 0.107 

Starting Model: experimental
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This is version 2.1 of the entry. See complete history


Literature

Oxygen-insensitive nitroreductase E. coli NfsA, but not NfsB, is inhibited by fumarate.

Day, M.A.Jarrom, D.Rajah, N.Searle, P.F.Hyde, E.I.White, S.A.

(2023) Proteins 91: 585-592

  • DOI: https://doi.org/10.1002/prot.26451
  • Primary Citation of Related Structures:  
    8AJX

  • PubMed Abstract: 

    Escherichia coli NfsA and NfsB are founding members of two flavoprotein families that catalyze the oxygen-insensitive reduction of nitroaromatics and quinones by NAD(P)H. This reduction is required for the activity of nitrofuran antibiotics and the enzymes have also been proposed for use with nitroaromatic prodrugs in cancer gene therapy and biocatalysis, but the roles of the proteins in vivo in bacteria are not known. NfsA is NADPH-specific whereas NfsB can also use NADH. The crystal structures of E. coli NfsA and NfsB and several analogs have been determined previously. In our crystal trials, we unexpectedly observed NfsA bound to fumarate. We here present the X-ray structure of the E. coli NfsA-fumarate complex and show that fumarate acts as a weak inhibitor of NfsA but not of NfsB. The structural basis of this differential inhibition is conserved in the two protein families and occurs at fumarate concentrations found in vivo, so impacting the efficacy of these proteins.


  • Organizational Affiliation

    School of Biosciences, University of Birmingham, Birmingham, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oxygen-insensitive NADPH nitroreductase240Escherichia coliMutation(s): 0 
Gene Names: nfsAmda18mdaAybjBb0851JW0835
EC: 1
UniProt
Find proteins for P17117 (Escherichia coli (strain K12))
Explore P17117 
Go to UniProtKB:  P17117
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP17117
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.133 
  • R-Value Work: 0.106 
  • R-Value Observed: 0.107 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.061α = 90
b = 52.237β = 134.17
c = 64.957γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-18
    Type: Initial release
  • Version 1.1: 2023-01-25
    Changes: Database references
  • Version 1.2: 2023-04-12
    Changes: Database references
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection
  • Version 2.1: 2024-02-07
    Changes: Refinement description