Structure of Aspartate-Semialdehyde Dehydrogenase from Methanococcus jannaschii

Experimental Data Snapshot

  • Resolution: 2.29 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

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A New Branch in the Family: Structure of Aspartate-beta-semialdehyde Dehydrogenase from Methanococcus jannaschii

Faehnle, C.R.Ohren, J.F.Viola, R.E.

(2005) J Mol Biol 353: 1055-1068

  • DOI: https://doi.org/10.1016/j.jmb.2005.09.027
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of aspartate-beta-semialdehyde dehydrogenase (ASADH) from Methanococcus jannaschii has been determined to 2.3 angstroms resolution using multiwavelength anomalous diffraction (MAD) phasing of a selenomethionine-substituted derivative to define a new branch in the family of ASADHs. This new structure has a similar overall fold and domain organization despite less than 10% conserved sequence identity with the bacterial enzymes. However, the entire repertoire of functionally important active site amino acid residues is conserved, suggesting an identical catalytic mechanism but with lower catalytic efficiency. A new coenzyme-binding conformation and dual NAD/NADP coenzyme specificity further distinguish this archaeal branch from the bacterial ASADHs. Several structural differences are proposed to account for the dramatically enhanced thermostability of this archaeal enzyme. Finally, the intersubunit communication channel connecting the active sites in the bacterial enzyme dimer has been disrupted in the archaeal ASADHs by amino acid changes that likely prevent the alternating sites reactivity previously proposed for the bacterial ASADHs.

  • Organizational Affiliation

    Department of Chemistry, University of Toledo, 2801 W. Bancroft St., Toledo, OH 43606, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartate-semialdehyde dehydrogenase
A, B
354Methanocaldococcus jannaschiiMutation(s): 10 
Gene Names: asd
Find proteins for Q57658 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Explore Q57658 
Go to UniProtKB:  Q57658
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ57658
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.29 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.254α = 90
b = 95.254β = 90
c = 297.957γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-01
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2015-04-29
    Changes: Non-polymer description