5FKM

TetR(D) T103A mutant in complex with anhydrotetracycline and magnesium, I4(1)22


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 

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


Literature

Modular Organisation of Inducer Recognition and Allostery in the Tetracycline Repressor

Werten, S.Schneider, J.Palm, G.J.Hinrichs, W.

(2016) FEBS J 283: 2102

  • DOI: https://doi.org/10.1111/febs.13723
  • Primary Citation of Related Structures:  
    5FKK, 5FKL, 5FKM, 5FKN, 5FKO

  • PubMed Abstract: 

    Induction of the tetracycline repressor (TetR) results from antibiotic-dependent changes in the relative positioning of the DNA-binding domains within the promoter-associated repressor dimer, but the key determinants of this allosteric effect remain poorly characterised. Intriguingly, previous mutational analyses of the tetracycline-interacting site revealed a lack of correlation between residual affinity and induction propensity, suggesting that some of the residues in contact with the antibiotic primarily act in ligand recognition and retention, whereas others are required to transmit the allosteric signal. Here, we provide a structural basis for these observations via crystallographic analysis of the point mutants N82A, H100A, T103A and E147A in complex with the inducer 5a,6-anhydrotetracycline. In conjunction with the available functional data, the four structures demonstrate that a trigger-like movement of the region between helices α6 and α7 towards and into the binding site plays a decisive role in the intramolecular communication process. In sharp contrast, residues lining the binding cavity proper have little or no influence on the allosteric mechanism as such. This nearly complete physical separation of ligand recognition and allostery will have allowed diverging TetR-like repressors to bind novel effectors while the existing induction mechanism remained intact. Consequently, the modularity described here may have been a key factor in the evolutionary success of the widespread and highly diversified repressor class. Structural data are available in the Protein Data Bank under the accession numbers 5FKK, 5FKL, 5FKM, 5FKN and 5FKO.


  • Organizational Affiliation

    Department of Molecular Structural Biology, Institute for Biochemistry, University of Greifswald, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TETRACYCLINE REPRESSOR, CLASS D207Escherichia coliMutation(s): 1 
UniProt
Find proteins for P0ACT4 (Escherichia coli)
Explore P0ACT4 
Go to UniProtKB:  P0ACT4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ACT4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.145α = 90
b = 68.145β = 90
c = 179.517γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-06
    Type: Initial release
  • Version 1.1: 2016-04-13
    Changes: Database references
  • Version 1.2: 2016-06-15
    Changes: Database references
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation, Other
  • Version 1.4: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description