Crystal Structure of Aspartate-Semialdehyde Dehydrogenase From Haemophilus influenzae with a Bound Periodate

Experimental Data Snapshot

  • Resolution: 2.15 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.235 

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Structural basis for discrimination between oxyanion substrates or inhibitors in aspartate-beta-semialdehyde dehydrogenase.

Faehnle, C.R.Blanco, J.Viola, R.E.

(2004) Acta Crystallogr D Biol Crystallogr 60: 2320-2324

  • DOI: https://doi.org/10.1107/S0907444904026411
  • Primary Citation of Related Structures:  
    1TA4, 1TB4

  • PubMed Abstract: 

    The reversible dephosphorylation of beta-aspartyl phosphate to L-aspartate-beta-semialdehyde (ASA) in the aspartate biosynthetic pathway is catalyzed by aspartate-beta-semialdehyde dehydrogenase (ASADH). The phosphate that is present to activate the aspartate carboxyl group is held in a separate and distinct binding site once removed and prior to its release from the enzyme. This site had been shown to be selective for tetrahedral oxyanions, with several competitive inhibitors and alternative substrates previously identified for the reverse reaction. Structural studies have now shown that the most potent oxyanion inhibitor (periodate) and a good alternative substrate (arsenate) each occupy the same catalytic phosphate-binding site. However, a rotation of a threonine side chain (Thr137) in the periodate complex disrupts an important hydrogen-bonding interaction with an active-site glutamate (Glu243) that participates in substrate orientation. This subtle change appears to be the difference between a substrate and an inhibitor of this enzyme.

  • Organizational Affiliation

    Department of Chemistry, University of Toledo, Ohio 43606, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartate-semialdehyde dehydrogenase371Haemophilus influenzaeMutation(s): 0 
Gene Names: ASDHI0646
Find proteins for P44801 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Explore P44801 
Go to UniProtKB:  P44801
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP44801
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PEJ

Download Ideal Coordinates CCD File 
I O4
Experimental Data & Validation

Experimental Data

  • Resolution: 2.15 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.235 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.999α = 90
b = 55.146β = 90
c = 57.646γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2004-12-07 
  • Deposition Author(s): Viola, R.E.

Revision History  (Full details and data files)

  • Version 1.0: 2004-12-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references, Derived calculations