Crystal structure of L-Threonine bound L-Threonine dehydrogenase (Y137F) from Hyperthermophilic Archaeon Thermoplasma volcanium

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 

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Crystal Structure of Binary and Ternary Complexes of Archaeal UDP-galactose 4-Epimerase-like L-Threonine Dehydrogenase from Thermoplasma volcanium.

Yoneda, K.Sakuraba, H.Araki, T.Ohshima, T.

(2012) J Biol Chem 287: 12966-12974

  • DOI: https://doi.org/10.1074/jbc.M111.336958
  • Primary Citation of Related Structures:  
    3A1N, 3A4V, 3A9W, 3AJR

  • PubMed Abstract: 

    A gene from the thermophilic archaeon Thermoplasma volcanium encoding an L-threonine dehydrogenase (L-ThrDH) with a predicted amino acid sequence that was remarkably similar to the sequence of UDP-galactose 4-epimerase (GalE) was overexpressed in Escherichia coli, and its product was purified and characterized. The expressed enzyme was moderately thermostable, retaining more than 90% of its activity after incubation for 10 min at up to 70 °C. The catalytic residue was assessed using site-directed mutagenesis, and Tyr(137) was found to be essential for catalysis. To clarify the structural basis of the catalytic mechanism, four different crystal structures were determined using the molecular replacement method: L-ThrDH-NAD(+), L-ThrDH in complex with NAD(+) and pyruvate, Y137F mutant in complex with NAD(+) and L-threonine, and Y137F in complex with NAD(+) and L-3-hydroxynorvaline. Each monomer consisted of a Rossmann-fold domain and a C-terminal catalytic domain, and the fold of the catalytic domain showed notable similarity to that of the GalE-like L-ThrDH from the psychrophilic bacterium Flavobacterium frigidimaris KUC-1. The substrate binding model suggests that the reaction proceeds through abstraction of the β-hydroxyl hydrogen of L-threonine via direct proton transfer driven by Tyr(137). The factors contributing to the thermostability of T. volcanium L-ThrDH were analyzed by comparing its structure to that of F. frigidimaris L-ThrDH. This comparison showed that the presence of extensive inter- and intrasubunit ion pair networks are likely responsible for the thermostability of T. volcanium L-ThrDH. This is the first description of the molecular basis for the substrate recognition and thermostability of a GalE-like L-ThrDH.

  • Organizational Affiliation

    Department of Bioscience, School of Agriculture, Tokai University, Aso, Kumamoto, 869-1404, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NDP-sugar epimerase
A, B
317Thermoplasma volcaniumMutation(s): 1 
Find proteins for Q97BK3 (Thermoplasma volcanium (strain ATCC 51530 / DSM 4299 / JCM 9571 / NBRC 15438 / GSS1))
Explore Q97BK3 
Go to UniProtKB:  Q97BK3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97BK3
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAD

Download Ideal Coordinates CCD File 
D [auth A],
G [auth B]
C21 H27 N7 O14 P2
Query on THR

Download Ideal Coordinates CCD File 
C [auth A],
F [auth B]
C4 H9 N O3
Query on MPD

Download Ideal Coordinates CCD File 
C6 H14 O2
Query on MRD

Download Ideal Coordinates CCD File 
C6 H14 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 150.203α = 90
b = 46.369β = 113.21
c = 89.751γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-05-02
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description