FadR, Fatty Acid Responsive Transcription Factor from Vibrio cholerae

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


The 40-residue insertion in Vibrio cholerae FadR facilitates binding of an additional fatty acyl-CoA ligand.

Shi, W.Kovacikova, G.Lin, W.Taylor, R.K.Skorupski, K.Kull, F.J.

(2015) Nat Commun 6: 6032-6032

  • DOI: https://doi.org/10.1038/ncomms7032
  • Primary Citation of Related Structures:  
    4P96, 4P9U, 4PDK

  • PubMed Abstract: 

    FadR is a master regulator of fatty acid metabolism and influences virulence in certain members of Vibrionaceae. Among FadR homologues of the GntR family, the Vibrionaceae protein is unusual in that it contains a C-terminal 40-residue insertion. Here we report the structure of Vibrio cholerae FadR (VcFadR) alone, bound to DNA, and in the presence of a ligand, oleoyl-CoA. Whereas Escherichia coli FadR (EcFadR) contains only one acyl-CoA-binding site in each monomer, crystallographic and calorimetric data indicate that VcFadR has two. One of the binding sites resembles that of EcFadR, whereas the other, comprised residues from the insertion, has not previously been observed. Upon ligand binding, VcFadR undergoes a dramatic conformational change that would more fully disrupt DNA binding than EcFadR. These findings suggest that the ability to bind and respond to an additional ligand allows FadR from Vibrionaceae to function as a more efficient regulator.

  • Organizational Affiliation

    1] Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, USA [2] Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fatty acid metabolism regulator protein
A, B
279Vibrio cholerae HC-21A1Mutation(s): 0 
Gene Names: fadRVCHC21A1_1913
Find proteins for A0A0H2UKZ1 (Vibrio cholerae HC-21A1)
Explore A0A0H2UKZ1 
Go to UniProtKB:  A0A0H2UKZ1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2UKZ1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.176 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.48α = 90
b = 87.48β = 90
c = 81.43γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI072661

Revision History  (Full details and data files)

  • Version 1.0: 2015-02-04
    Type: Initial release
  • Version 1.1: 2015-02-25
    Changes: Derived calculations
  • Version 1.2: 2017-09-20
    Changes: Author supporting evidence, Derived calculations, Other, Refinement description, Source and taxonomy
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references, Refinement description