4XXH

TREHALOSE REPRESSOR FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.151 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

CRYSTAL STRUCTURE OF THE EFFECTOR-BINDING DOMAIN OF THE TREHALOSE-REPRESSOR OF ESCHERICHIA COLI, A MEMBER OF THE LACI FAMILY, IN ITS COMPLEXES WITH INDUCER TREHALOSE-6-PHOSPHATE AND NONINDUCER TREHALOSE.

Hars, U.Horlacher, R.Boos, W.Welte, W.Diederichs, K.

(1998) PROTEIN SCI. 7: 2511-2521

  • DOI: 10.1002/pro.5560071204
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The crystal structure of the Escherichia coli trehalose repressor (TreR) in a complex with its inducer trehalose-6-phosphate was determined by the method of multiple isomorphous replacement (MIR) at 2.5 A resolution, followed by the structure determi ...

    The crystal structure of the Escherichia coli trehalose repressor (TreR) in a complex with its inducer trehalose-6-phosphate was determined by the method of multiple isomorphous replacement (MIR) at 2.5 A resolution, followed by the structure determination of TreR in a complex with its noninducer trehalose at 3.1 A resolution. The model consists of residues 61 to 315 comprising the effector binding domain, which forms a dimer as in other members of the LacI family. This domain is composed of two similar subdomains each consisting of a central beta-sheet sandwiched between alpha-helices. The effector binding pocket is at the interface of these subdomains. In spite of different physiological functions, the crystal structures of the two complexes of TreR turned out to be virtually identical to each other with the conformation being similar to those of the effector binding domains of the LacI and PurR in complex with their effector molecules. According to the crystal structure, the noninducer trehalose binds to a similar site as the trehalose portion of trehalose-6-phosphate. The binding affinity for the former is lower than for the latter. The noninducer trehalose thus binds competitively to the repressor. Unlike the phosphorylated inducer molecule, it is incapable of blocking the binding of the repressor headpiece to its operator DNA. The ratio of the concentrations of trehalose-6-phosphate and trehalose thus is used to switch between the two alternative metabolic uses of trehalose as an osmoprotectant and as a carbon source.


    Related Citations: 
    • Achieving High Quality Ligand Chemistry in Protein-Ligand Crystal Structures for Drug Design
      Smart, O.S.,Bricogne, G.
      (2015) Multifaceted Roles of Crystallography in Modern Drug Discovery, NATO Science for Peace and Security Series A: Chemistry and Biology, --: --


    Organizational Affiliation

    Department of Biology, University of Konstanz, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HTH-type transcriptional regulator TreR
A, B
255Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: treR
Find proteins for P36673 (Escherichia coli (strain K12))
Go to UniProtKB:  P36673
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
T6P
Query on T6P

Download SDF File 
Download CCD File 
A, B
Trehalose-6-phosphate
6-O-phosphono-alpha-D-glucopyranosyl alpha-D-glucopyranoside
C12 H23 O14 P
LABSPYBHMPDTEL-LIZSDCNHSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
T6PKd: 10000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.151 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 84.890α = 90.00
b = 84.890β = 90.00
c = 169.000γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
DENZOdata reduction
BUSTERrefinement
DAREFIphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-06-10
    Type: Non-polymer description