3FXQ

Crystal structure of the LysR-type transcriptional regulator TsaR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural studies on the full-length LysR-type regulator TsaR from Comamonas testosteroni T-2 reveal a novel open conformation of the tetrameric LTTR fold

Monferrer, D.Tralau, T.Kertesz, M.A.Dix, I.Sola, M.Uson, I.

(2010) Mol Microbiol 75: 1199-1214

  • DOI: 10.1111/j.1365-2958.2010.07043.x
  • Primary Citation of Related Structures:  
    3FXU, 3FXQ, 3FXR, 3FZJ

  • PubMed Abstract: 
  • LysR-type transcriptional regulators (LTTRs) constitute the largest family of regulators in prokaryotes. The full-length structures of the LTTR TsaR from Comamonas testosteroni T-2 and its complex with the natural inducer para-toluensulfonate have been characterized by X-ray diffraction ...

    LysR-type transcriptional regulators (LTTRs) constitute the largest family of regulators in prokaryotes. The full-length structures of the LTTR TsaR from Comamonas testosteroni T-2 and its complex with the natural inducer para-toluensulfonate have been characterized by X-ray diffraction. Both ligand-free and complexed forms reveal a dramatically different quaternary structure from that of CbnR from Ralstonia eutropha, or a putative LysR-type regulator from Pseudomonas aeruginosa, the only other determined full-length structures of tetrameric LTTRs. Although all three show a head-to-head tetrameric ring, TsaR displays an open conformation, whereas CbnR and PA01-PR present additional contacts in opposing C-terminal domains that close the ring. Such large differences may be due to a broader structural versatility than previously assumed or either, reflect the intrinsic flexibility of tetrameric LTTRs. On the grounds of the sliding dimer hypothesis of LTTR activation, we propose a structural model in which the closed structures could reflect the conformation of a ligand-free LTTR, whereas inducer binding would bring about local changes to disrupt the interface linking the two compact C-terminal domains. This could lead to a TsaR-like, open structure, where the pairs of recognition helices are closer to each other by more than 10 A.


    Related Citations: 
    • High crystallizability under air-exclusion conditions of the full-length LysR-type transcriptional regulator TsaR from Comamonas testosteroni T-2 and data-set analysis for a MIRAS structure-solution approach
      Monferrer, D., Tralau, T., Kertesz, M.A., Panjikar, S., Uson, I.
      (2008) Acta Crystallogr Sect F Struct Biol Cryst Commun 64: 764

    Organizational Affiliation

    IBMB-CSIC, Baldiri Reixach 15, Barcelona Science Park, 08028, Barcelona, Spain.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LysR type regulator of tsaMBCDA, B305Comamonas testosteroniMutation(s): 0 
Gene Names: tsaR
UniProt
Find proteins for P94678 (Comamonas testosteroni)
Explore P94678 
Go to UniProtKB:  P94678
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.496α = 90
b = 51.489β = 110.35
c = 107.754γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
PROTEUM PLUSdata collection
XDSdata reduction
PROTEUMdata reduction
XSCALEdata scaling
SADABSdata scaling
SHARPphasing
RESOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-01-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description