Crystal structure of the TetR-like transcriptional regulator LfrR from Mycobacterium smegmatis

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 

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Structural Plasticity and Distinct Drug-Binding Modes of Lfrr, a Mycobacterial Efflux Pump Regulator.

Bellinzoni, M.Buroni, S.Schaeffer, F.Riccardi, G.De Rossi, E.Alzari, P.M.

(2009) J Bacteriol 191: 7531

  • DOI: https://doi.org/10.1128/JB.00631-09
  • Primary Citation of Related Structures:  
    2V57, 2WGB

  • PubMed Abstract: 

    The TetR-like transcriptional repressor LfrR controls the expression of the gene encoding the Mycobacterium smegmatis efflux pump LfrA, which actively extrudes fluoroquinolones, cationic dyes, and anthracyclines from the cell and promotes intrinsic antibiotic resistance. The crystal structure of the apoprotein form of the repressor reveals a structurally asymmetric homodimer exhibiting local unfolding and a blocked drug-binding site, emphasizing the significant conformational plasticity of the protein necessary for DNA and multidrug recognition. Crystallographic and calorimetric studies of LfrR-drug complexes further confirm the intrinsic flexibility of the homodimer, which provides a dynamic mechanism to broaden multidrug binding specificity and may be a general property of transcriptional repressors regulating microbial efflux pump expression.

  • Organizational Affiliation

    Institut Pasteur, Unité de Biochimie Structurale and CNRS URA 2185, Institut Pasteur, 75724 Paris Cedex 15, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
190Mycolicibacterium smegmatisMutation(s): 0 
Find proteins for Q58L87 (Mycolicibacterium smegmatis)
Explore Q58L87 
Go to UniProtKB:  Q58L87
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ58L87
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.646α = 90
b = 86.646β = 90
c = 96.77γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-20
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance