4V2G

Tetracycline repressor TetR(D) bound to chlortetracycline and iso- chlortetracycline


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.182 

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Ligand Structure Quality Assessment 


This is version 1.1 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: 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 ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TETRACYCLINE REPRESSOR PROTEIN CLASS DA, B207Escherichia coliMutation(s): 0 
Gene Names: tetR
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
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CTC
Query on CTC

Download Ideal Coordinates CCD File 
D [auth B]7-CHLOROTETRACYCLINE
C22 H23 Cl N2 O8
CYDMQBQPVICBEU-XRNKAMNCSA-N
 Ligand Interaction
ITC
Query on ITC

Download Ideal Coordinates CCD File 
C [auth A]ISO-7-CHLORTETRACYCLINE
C22 H23 Cl N2 O8
GFSLIMZISCAANG-AXVXPIMKSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
E [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.182 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.249α = 90
b = 69.249β = 90
c = 182.373γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
X-PLORphasing

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