4D7N

TetR(D) in complex with anhydrotetracycline and potassium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Tetracycline Repressor Allostery Does not Depend on Divalent Metal Recognition.

Werten, S.Dalm, D.Palm, G.J.Grimm, C.C.Hinrichs, W.

(2014) Biochemistry 53: 7990

  • DOI: https://doi.org/10.1021/bi5012805
  • Primary Citation of Related Structures:  
    2XPU, 4D7M, 4D7N, 4V2F, 4V2G

  • PubMed Abstract: 

    Genes that render bacteria resistant to tetracycline-derived antibiotics are tightly regulated by repressors of the TetR family. In their physiologically relevant, magnesium-complexed form, tetracyclines induce allosteric rearrangements in the TetR homodimer, leading to its release from the promoter and derepression of transcription. According to earlier crystallographic work, recognition of the tetracycline-associated magnesium ion by TetR is crucial and triggers the allosteric cascade. Nevertheless, the derivative 5a,6-anhydrotetracycline, which shows an increased affinity for TetR, causes promoter release even in the absence of magnesium. To resolve this paradox, it has been proposed that metal-free 5a,6-anhydrotetracycline acts via an exceptional, conformationally different induction mode that circumvents the normal magnesium requirement. We have tested this hypothesis by determining crystal structures of TetR-5a,6-anhydrotetracycline complexes in the presence of magnesium, ethylenediaminetetraacetic acid, or high concentrations of potassium. Analysis of these three structures reveals that, irrespective of the metal, the effects of 5a,6-anhydrotetracycline binding are indistinguishable from those of canonical induction by other tetracyclines. Together with a close scrutiny of the earlier evidence of a metal-triggered mechanism, these results demonstrate that magnesium recognition per se is not a prerequisite for tetracycline repressor allostery.


  • Organizational Affiliation

    Department of Molecular Structural Biology, Institute for Biochemistry, University of Greifswald , Felix-Hausdorff-Strasse 4, D-17487 Greifswald, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TETRACYCLINE REPRESSOR, CLASS D217Escherichia coliMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.065α = 90
b = 68.065β = 90
c = 178.909γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-10
    Type: Initial release
  • Version 1.1: 2015-01-14
    Changes: Database references
  • Version 1.2: 2015-04-22
    Changes: Other
  • Version 1.3: 2019-07-17
    Changes: Data collection
  • Version 1.4: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description