Crystal Structure of Threonine Synthase from Thermus Thermophilus HB8, Trigonal Crystal Form

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.191 

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Crystal Structures of Threonine Synthase from Thermus thermophilus HB8: Conformational change, substrate recognition, and mechanism.

Omi, R.Masaru, G.Miyahara, I.Mizuguchi, H.Hayashi, H.Kagamiyama, H.Hirotsu, K.

(2003) J Biol Chem 278: 46035-46045

  • DOI: https://doi.org/10.1074/jbc.M308065200
  • Primary Citation of Related Structures:  
    1UIM, 1UIN, 1V7C

  • PubMed Abstract: 

    Threonine synthase, which is a PLP-dependent enzyme, catalyzes the beta,gamma-replacement reaction of l-homoserine phosphate to yield threonine and inorganic phosphate. The three-dimensional structures of the enzyme from Thermus thermophilus HB8 in its unliganded form and complexed with the substrate analogue 2-amino-5-phosphonopentanoic acid have been determined at 2.15 and 2.0 A resolution, respectively. The complexed form, assigned as an enamine, uncovered the interactions of the cofactor-analogue conjugate with the active site residues. The binding of the substrate analogue induces a large conformational change at the domain level. The small domain rotates by about 25 degrees and approaches the large domain to close the active site. The complicated catalytic process of the enzyme has been elucidated based on the complex structure to reveal the stereochemistry of the reaction and to present the released inorganic phosphate as a possible catalyst to carry a proton to the Cgamma atom of the substrate.

  • Organizational Affiliation

    Department of Chemistry, Graduate School of Science, Osaka City University, Osaka 558-8585, Japan.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Threonine Synthase
A, B
351Thermus thermophilusMutation(s): 0 
Gene Names: HB8TthHB5018_04960
Find proteins for P83823 (Thermus thermophilus)
Explore P83823 
Go to UniProtKB:  P83823
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP83823
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.191 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.207α = 90
b = 113.207β = 90
c = 150.346γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance