5FKN

TetR(D) T103A mutant in complex with anhydrotetracycline and magnesium, P4(3)2(1)2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.3 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: 10.1111/febs.13723
  • Primary Citation of Related Structures:  
  • Also Cited By: 6RGX, 6RCR, 6RBM, 6RBL, 6QJX, 6QJW, 6FPL, 5MRU

  • 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 ...

    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.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TETRACYCLINE REPRESSOR, CLASS D, T103A MUTANT
A, B
207Escherichia coliMutation(s): 1 
Gene Names: tetR
Find proteins for P0ACT4 (Escherichia coli)
Go to UniProtKB:  P0ACT4
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
TDC
Query on TDC

Download SDF File 
Download CCD File 
A, B
5A,6-ANHYDROTETRACYCLINE
C22 H22 N2 O7
CXCVEERYMJZMMM-DOCRCCHOSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.224 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 67.950α = 90.00
b = 67.950β = 90.00
c = 179.450γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-04-06
    Type: Initial release
  • Version 1.1: 2016-04-13
    Type: Database references
  • Version 1.2: 2016-06-15
    Type: Database references
  • Version 1.3: 2019-05-08
    Type: Data collection, Experimental preparation, Other