1E5X

Structure of threonine synthase from Arabidopsis thaliana


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of Threonine Synthase from Arabidopsis Thaliana

Thomazeau, K.Curien, G.Dumas, R.Biou, V.

(2001) Protein Sci. 10: 638

  • DOI: 10.1110/ps.44301

  • PubMed Abstract: 
  • Threonine synthase (TS) is a PLP-dependent enzyme that catalyzes the last reaction in the synthesis of threonine from aspartate. In plants, the methionine pathway shares the same substrate, O-phospho-L-homoserine (OPH), and TS is activated by S-adeno ...

    Threonine synthase (TS) is a PLP-dependent enzyme that catalyzes the last reaction in the synthesis of threonine from aspartate. In plants, the methionine pathway shares the same substrate, O-phospho-L-homoserine (OPH), and TS is activated by S-adenosyl-methionine (SAM), a downstream product of methionine synthesis. This positive allosteric effect triggered by the product of another pathway is specific to plants. The crystal structure of Arabidopsis thaliana apo threonine synthase was solved at 2.25 A resolution from triclinic crystals using MAD data from the selenomethionated protein. The structure reveals a four-domain dimer with a two-stranded beta-sheet arm protruding from one monomer onto the other. This domain swap could form a lever through which the allosteric effect is transmitted. The N-terminal domain (domain 1) has a unique fold and is partially disordered, whereas the structural core (domains 2 and 3) shares the functional domain of PLP enzymes of the same family. It also has similarities with SAM-dependent methyltransferases. Structure comparisons allowed us to propose potential sites for pyridoxal-phosphate and SAM binding on TS; they are close to regions that are disordered in the absence of these molecules.


    Organizational Affiliation

    Institut de Biologie Structurale Jean-Pierre Ebel, Unité Mixte de Recherche 5075 Centre National de la Recherche Scientifique-Centre d'Etudes Nucléaires-Université Joseph Fourier, F-38027 Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THREONINE SYNTHASE
A, B
486Arabidopsis thalianaGene Names: TS1 (MTO2)
EC: 4.2.3.1
Find proteins for Q9S7B5 (Arabidopsis thaliana)
Go to UniProtKB:  Q9S7B5
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
MSO
Query on MSO
A, B
L-PEPTIDE LINKINGC5 H11 N O3 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.222 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 57.760α = 109.48
b = 62.140β = 97.61
c = 76.590γ = 112.74
Software Package:
Software NamePurpose
SHARPphasing
SCALAdata scaling
MOSFLMdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-08-02
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance