3VUQ

Crystal structure of TTHA0167, a transcriptional regulator, TetR/AcrR family from Thermus thermophilus HB8


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and function of a TetR family transcriptional regulator, SbtR, from thermus thermophilus HB8

Agari, Y.Sakamoto, K.Yutani, K.Kuramitsu, S.Shinkai, A.

(2013) Proteins 81: 1166-1178

  • DOI: 10.1002/prot.24266

  • PubMed Abstract: 
  • SbtR is one of the four TetR family transcriptional regulators present in the extremely thermophilic bacterium, Thermus thermophilus HB8. We identified 10 genes controlled by four promoters with negative regulation by SbtR in vitro. The SbtR-regulate ...

    SbtR is one of the four TetR family transcriptional regulators present in the extremely thermophilic bacterium, Thermus thermophilus HB8. We identified 10 genes controlled by four promoters with negative regulation by SbtR in vitro. The SbtR-regulated gene products include probable transporters, probable enzymes for sugar or amino acid metabolism, and nucleic acid-related enzymes. SbtR binds pseudopalindromic sequences, with the consensus sequence of 5'-TGACCCNNKGGTCA-3' surrounding the promoters, and has a proposed 1:1 dimer binding stoichiometry. The X-ray crystal structure analysis revealed that SbtR comprises either nine or 10 α-helices and forms a dimer, as in the typical TetR family proteins. Similar to many characterized TetR family regulators, SbtR has a predicted ligand-binding pocket at the center of each monomer. Interestingly, the SbtR dimer contains an intermolecular disulfide bridge, formed between the Cys164 residues at the entrance of the pocket. The Cys164Ser and Cys164Ala mutant SbtR proteins formed homodimers similar to that of the wild type, but their thermal stabilities were lower by about 8°C, indicating that the disulfide bridge contributes to the thermal stability of the protein. However, altered repression activity of the mutants was not observed in vitro. From these results, we propose that ligand-binding is essential for SbtR to disengage from DNA, in a similar manner to the other characterized TetR family regulators. The formation and reduction of the disulfide bond might function in controlling the ligand-binding affinity of this transcriptional regulator.


    Organizational Affiliation

    RIKEN SPring-8 Center, RIKEN Harima Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcriptional regulator (TetR/AcrR family)
A, B, C, D
187Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)N/A
Find proteins for Q5SLX6 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SLX6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 44.327α = 90.00
b = 174.821β = 92.43
c = 56.158γ = 90.00
Software Package:
Software NamePurpose
BSSdata collection
HKL-2000data reduction
CNSrefinement
HKL-2000data scaling
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-02-27
    Type: Initial release
  • Version 1.1: 2013-12-25
    Type: Database references