2D1F

Structure of Mycobacterium tuberculosis threonine synthase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural, biochemical, and in vivo investigations of the threonine synthase from Mycobacterium tuberculosis.

Covarrubias, A.S.Hogbom, M.Bergfors, T.Carroll, P.Mannerstedt, K.Oscarson, S.Parish, T.Jones, T.A.Mowbray, S.L.

(2008) J Mol Biol 381: 622-633

  • DOI: 10.1016/j.jmb.2008.05.086
  • Primary Citation of Related Structures:  
    2D1F

  • PubMed Abstract: 
  • Threonine biosynthesis is a general feature of prokaryotes, eukaryotic microorganisms, and higher plants. Since mammals lack the appropriate synthetic machinery, instead obtaining the amino acid through their diet, the pathway is a potential focus for the development of novel antibiotics, antifungal agents, and herbicides ...

    Threonine biosynthesis is a general feature of prokaryotes, eukaryotic microorganisms, and higher plants. Since mammals lack the appropriate synthetic machinery, instead obtaining the amino acid through their diet, the pathway is a potential focus for the development of novel antibiotics, antifungal agents, and herbicides. Threonine synthase (TS), a pyridoxal-5-phosphate-dependent enzyme, catalyzes the final step in the pathway, in which L-homoserine phosphate and water are converted into threonine and inorganic phosphate. In the present publication, we report structural and functional studies of Mycobacterium tuberculosis TS, the product of the rv1295 (thrC) gene. The structure gives new insights into the catalytic mechanism of TSs in general, specifically by suggesting the direct involvement of the phosphate moiety of the cofactor, rather than the inorganic phosphate product, in transferring a proton from C4' to C(gamma) in the formation of the alphabeta-unsaturated aldimine. It further provides a basis for understanding why this enzyme has a higher pH optimum than has been reported elsewhere for TSs and gives rise to the prediction that the equivalent enzyme from Thermus thermophilus will exhibit similar behavior. A deletion of the relevant gene generated a strain of M. tuberculosis that requires threonine for growth; such auxotrophic strains are frequently attenuated in vivo, indicating that TS is a potential drug target in this organism.


    Organizational Affiliation

    Department of Cell and Molecular Biology, Uppsala University, SE-751 24 Uppsala, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Threonine synthaseA, B360Mycobacterium tuberculosisMutation(s): 0 
EC: 4.2.3.1
Find proteins for P9WG59 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WG59 
Go to UniProtKB:  P9WG59
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP
Query on PLP

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.964α = 90
b = 55.964β = 90
c = 368.378γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance