6P7T

Crystal structure of apo ToxT K231A from Vibrio cholerae strain SCE256


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.250 

wwPDB Validation 3D Report Full Report



Literature

Structural basis for virulence regulation inVibrio choleraeby unsaturated fatty acid components of bile.

Cruite, J.T.Kovacikova, G.Clark, K.A.Woodbrey, A.K.Skorupski, K.Kull, F.J.

(2019) Commun Biol 2: 440-440

  • DOI: 10.1038/s42003-019-0686-x
  • Primary Citation of Related Structures:  
    6PB9, 6P7R, 6P7T

  • PubMed Abstract: 
  • The AraC/XylS-family transcriptional regulator ToxT is the master virulence activator of Vibrio cholerae , the gram-negative bacterial pathogen that causes the diarrheal disease cholera. Unsaturated fatty acids (UFAs) found in bile inhibit th ...

    The AraC/XylS-family transcriptional regulator ToxT is the master virulence activator of Vibrio cholerae , the gram-negative bacterial pathogen that causes the diarrheal disease cholera. Unsaturated fatty acids (UFAs) found in bile inhibit the activity of ToxT. Crystal structures of inhibited ToxT bound to UFA or synthetic inhibitors have been reported, but no structure of ToxT in an active conformation had been determined. Here we present the 2.5 Å structure of ToxT without an inhibitor. The structure suggests release of UFA or inhibitor leads to an increase in flexibility, allowing ToxT to adopt an active conformation that is able to dimerize and bind DNA. Small-angle X-ray scattering was used to validate a structural model of an open ToxT dimer bound to the cholera toxin promoter. The results presented here provide a detailed structural mechanism for virulence gene regulation in V. cholerae by the UFA components of bile and other synthetic ToxT inhibitors.


    Organizational Affiliation

    4Department of Chemistry, Dartmouth College, Hanover, NH USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Toxin co-regulated pilus virulence regulatory proteinA277Vibrio choleraeMutation(s): 1 
Gene Names: tcpND6V39_18295
Find proteins for Q9F5Q9 (Vibrio cholerae)
Explore Q9F5Q9 
Go to UniProtKB:  Q9F5Q9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.250 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.8α = 90
b = 45.5β = 97.7
c = 77γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

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 States5R01AI120068

Revision History 

  • Version 1.0: 2020-01-01
    Type: Initial release