Crystal Structure of ToxT from Vibrio Cholerae O395

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

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This is version 1.3 of the entry. See complete history


Structure of Vibrio cholerae ToxT reveals a mechanism for fatty acid regulation of virulence genes.

Lowden, M.J.Skorupski, K.Pellegrini, M.Chiorazzo, M.G.Taylor, R.K.Kull, F.J.

(2010) Proc Natl Acad Sci U S A 107: 2860-2865

  • DOI: https://doi.org/10.1073/pnas.0915021107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cholera is an acute intestinal infection caused by the bacterium Vibrio cholerae. In order for V. cholerae to cause disease, it must produce two virulence factors, the toxin-coregulated pilus (TCP) and cholera toxin (CT), whose expression is controlled by a transcriptional cascade culminating with the expression of the AraC-family regulator, ToxT. We have solved the 1.9 A resolution crystal structure of ToxT, which reveals folds in the N- and C-terminal domains that share a number of features in common with AraC, MarA, and Rob as well as the unexpected presence of a buried 16-carbon fatty acid, cis-palmitoleate. The finding that cis-palmitoleic acid reduces TCP and CT expression in V. cholerae and prevents ToxT from binding to DNA in vitro provides a direct link between the host environment of V. cholerae and regulation of virulence gene expression.

  • Organizational Affiliation

    Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, NH 03755, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TCP pilus virulence regulatory protein276Vibrio cholerae O395Mutation(s): 0 
Gene Names: tcpNtoxTVC0395_A0363
Find proteins for A5F384 (Vibrio cholerae serotype O1 (strain ATCC 39541 / Classical Ogawa 395 / O395))
Explore A5F384 
Go to UniProtKB:  A5F384
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA5F384
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PAM

Download Ideal Coordinates CCD File 
C16 H30 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.311α = 90
b = 77.739β = 90
c = 83.568γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations
  • Version 1.3: 2024-04-03
    Changes: Refinement description