2ZK7

Structure of a C-terminal deletion mutant of Thermoplasma acidophilum aldohexose dehydrogenase (AldT)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.240 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

C-terminal tail derived from the neighboring subunit is critical for the activity of Thermoplasma acidophilum D-aldohexose dehydrogenase

Nishioka, T.Yasutake, Y.Nishiya, Y.Tamura, N.Tamura, T.

(2009) Proteins 74: 801-807

  • DOI: https://doi.org/10.1002/prot.22300
  • Primary Citation of Related Structures:  
    2ZK7

  • PubMed Abstract: 

    The D-aldohexose dehydrogenase from the thermoacidophilic archaeon Thermoplasma acidophilum (AldT) is a homotetrameric enzyme that catalyzes the oxidation of several D-aldohexoses, especially D-mannose. AldT comprises a unique C-terminal tail motif (residues 247-255) that shuts the active-site pocket of the neighboring subunit. The functional role of the C-terminal tail of AldT has been investigated using mutational and crystallographic analyses. A total of four C-terminal deletion mutants (Delta254, Delta253, Delta252, and Delta249) and two site-specific mutants (Y86G and P254G) were expressed by Escherichia coli and purified. Enzymatic characterization of these mutants revealed that the C-terminal tail is a requisite and that the interaction between Tyr86 and Pro254 is critical for enzyme activity. The crystal structure of the Delta249 mutant was also determined. The structure showed that the active-site loops undergo a significant conformational change, which leads to the structural deformation of the substrate-binding pocket.


  • Organizational Affiliation

    Laboratory of Molecular Environmental Microbiology, Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glucose 1-dehydrogenase related protein
A, B
257Thermoplasma acidophilumMutation(s): 0 
Gene Names: Ta0754
EC: 1.1.1.118
UniProt
Find proteins for Q9HK51 (Thermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165))
Explore Q9HK51 
Go to UniProtKB:  Q9HK51
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HK51
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.240 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.238α = 90
b = 68.238β = 90
c = 337.356γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2014-01-22
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Refinement description