2XGD

Crystal structure of a designed homodimeric variant T-A(L)A(L) of the tetracycline repressor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Computational Design of a Chain-Specific Tetracycline Repressor Heterodimer.

Stiebritz, M.T.Wengrzik, S.Klein, D.L.Richter, J.P.Srebrzynski, A.Weiler, S.Muller, Y.A.

(2010) J.Mol.Biol. 403: 371

  • DOI: 10.1016/j.jmb.2010.07.055
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The specificity and selectivity of protein-protein interactions are of central importance for many biological processes, including signal transduction and transcription control. We used the in-house side-chain packing program MUMBO to computationally ...

    The specificity and selectivity of protein-protein interactions are of central importance for many biological processes, including signal transduction and transcription control. We used the in-house side-chain packing program MUMBO to computationally design a chain-specific heterodimeric variant of the bacterial transcription regulator tetracycline repressor (TetR), called T-A(A)B. Our goal was to engineer two different TetR chain variants, A and B, that no longer interact as AA or BB homodimers but selectively recombine to form heterodimers. Although 56 residues from each chain contribute to a dimer interface as large as 2200 Å(2) in wild-type TetR, the substitution of only three residues in one chain and two residues in a second chain sufficed for generating specificity in a T-A(A)B heterodimer variant. The design was corroborated in vivo by a cell-based transcription assay, and in vitro by CD spectroscopy and X-ray crystallography. Crystal structure analyses showed that while selectivity in the B chain is achieved entirely through van der Waals repulsion, the best selectivity in the A chain is obtained for the variant with the lowest number of atoms in the interface, thus possibly leading to underpacking of the dimer interface. This results in a marked decrease in thermal stability and a drastic reduction in the solubility of the T-A(A)A(A) homodimer in comparison to the designed T-A(A)B heterodimer variant.


    Organizational Affiliation

    Lehrstuhl für Biotechnik, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Im IZMP, Henkestr. 91, D-91052 Erlangen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TETRACYCLINE REPRESSOR PROTEIN CLASS B FROM TRANSPOSON TN10, TETRACYCLINE REPRESSOR PROTEIN CLASS D
A
208Escherichia coliMutation(s): 2 
Gene Names: tetR, tetR
Find proteins for P04483 (Escherichia coli)
Go to UniProtKB:  P04483
Find proteins for P0ACT4 (Escherichia coli)
Go to UniProtKB:  P0ACT4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.217 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 69.656α = 90.00
b = 69.656β = 90.00
c = 184.328γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XSCALEdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-09-22
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance