2VKV

TetR (BD) variant L17G with reverse phenotype


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.180 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

A Protein Functional Leap: How a Single Mutation Reverses the Function of the Transcription Regulator Tetr.

Resch, M.Striegl, H.Henssler, E.M.Sevvana, M.Egerer-Sieber, C.Schiltz, E.Hillen, W.Muller, Y.A.

(2008) Nucleic Acids Res 36: 4390

  • DOI: https://doi.org/10.1093/nar/gkn400
  • Primary Citation of Related Structures:  
    2VKV

  • PubMed Abstract: 

    Today's proteome is the result of innumerous gene duplication, mutagenesis, drift and selection processes. Whereas random mutagenesis introduces predominantly only gradual changes in protein function, a case can be made that an abrupt switch in function caused by single amino acid substitutions will not only considerably further evolution but might constitute a prerequisite for the appearance of novel functionalities for which no promiscuous protein intermediates can be envisaged. Recently, tetracycline repressor (TetR) variants were identified in which binding of tetracycline triggers the repressor to associate with and not to dissociate from the operator DNA as in wild-type TetR. We investigated the origin of this activity reversal by limited proteolysis, CD spectroscopy and X-ray crystallography. We show that the TetR mutant Leu17Gly switches its function via a disorder-order mechanism that differs completely from the allosteric mechanism of wild-type TetR. Our study emphasizes how single point mutations can engender unexpected leaps in protein function thus enabling the appearance of new functionalities in proteins without the need for promiscuous intermediates.


  • Organizational Affiliation

    Lehrstuhl für Biotechnik, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Henkestrasse 91 and Staudtstrasse 5, D-91052 Erlangen, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TETRACYCLINE REPRESSOR PROTEIN CLASS B FROM TRANSPOSON TN10, TETRACYCLINE REPRESSOR PROTEIN CLASS D208Escherichia 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: 1.74 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.65α = 90
b = 54.46β = 90
c = 56.85γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata 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: 2008-07-08
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-06-28
    Changes: Data collection
  • Version 1.4: 2019-03-06
    Changes: Data collection, Experimental preparation
  • Version 1.5: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description