4XXH

TREHALOSE REPRESSOR FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.152 

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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:  
    4XXH

  • 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 determination of TreR in a complex with its noninducer trehalose at 3 ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HTH-type transcriptional regulator TreRAB255Escherichia coli K-12Mutation(s): 0 
Gene Names: treRb4241JW4200
Find proteins for P36673 (Escherichia coli (strain K12))
Explore P36673 
Go to UniProtKB:  P36673
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
6-O-phosphono-alpha-D-glucopyranose-(1-1)-alpha-D-glucopyranose
C, D
2 N/A Oligosaccharides Interaction
Small Molecules
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
T6PKd:  10000   nM  Binding MOAD
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900039
Query on PRD_900039
C, Dtrehalose-6-phosphateOligosaccharide /  Substrate analog

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.152 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.89α = 90
b = 84.89β = 90
c = 169γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
BUSTERrefinement
DENZOdata reduction
DAREFIphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-06-10
    Changes: Non-polymer description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary