2XRN

Crystal structure of TtgV


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal Structure of Ttgv in Complex with its DNA Operator Reveals a General Model for Cooperative DNA Binding of Tetrameric Gene Regulators.

Lu, D.Fillet, S.Meng, C.Alguel, Y.Kloppsteck, P.Bergeron, J.Krell, T.Gallegos, M.T.Ramos, J.Zhang, X.

(2010) Genes Dev 24: 2556

  • DOI: 10.1101/gad.603510
  • Primary Citation of Related Structures:  
    2XRN, 2XRO

  • PubMed Abstract: 
  • The majority of bacterial gene regulators bind as symmetric dimers to palindromic DNA operators of 12-20 base pairs (bp). Multimeric forms of proteins, including tetramers, are able to recognize longer operator sequences in a cooperative manner, although how this is achieved is not well understood due to the lack of complete structural information ...

    The majority of bacterial gene regulators bind as symmetric dimers to palindromic DNA operators of 12-20 base pairs (bp). Multimeric forms of proteins, including tetramers, are able to recognize longer operator sequences in a cooperative manner, although how this is achieved is not well understood due to the lack of complete structural information. Models, instead of structures, of complete tetrameric assembly on DNA exist in literature. Here we present the crystal structures of the multidrug-binding protein TtgV, a gene repressor that controls efflux pumps, alone and in complex with a 42-bp DNA operator containing two TtgV recognition sites at 2.9 Å and 3.4 Å resolution. These structures represent the first full-length functional tetrameric protein in complex with its intact DNA operator containing two continuous recognition sites. TtgV binds to its DNA operator as a highly asymmetric tetramer and induces considerable distortions in the DNA, resulting in a 60° bend. Upon binding to its operator, TtgV undergoes large conformational changes at the monomeric, dimeric, and tetrameric levels. The structures here reveal a general model for cooperative DNA binding of tetrameric gene regulators and provide a structural basis for a large body of biochemical data and a reinterpretation of previous models for tetrameric gene regulators derived from partial structural data.


    Organizational Affiliation

    Division of Molecular Biosciences, Centre for Structural Biology, Imperial College, London, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HTH-TYPE TRANSCRIPTIONAL REGULATOR TTGVA, B241Pseudomonas putidaMutation(s): 2 
Find proteins for Q93PU6 (Pseudomonas putida (strain DOT-T1E))
Explore Q93PU6 
Go to UniProtKB:  Q93PU6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.862α = 90
b = 116.184β = 104.34
c = 71.881γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-01
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance