Structure of Aspartate Semialdehyde Dehydrogenase (ASADH) from Streptococcus pneumoniae complexed with NADP

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 

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Examination of key intermediates in the catalytic cycle of aspartate-beta-semialdehyde dehydrogenase from a gram-positive infectious bacteria.

Faehnle, C.R.Le Coq, J.Liu, X.Viola, R.E.

(2006) J Biol Chem 281: 31031-31040

  • DOI: https://doi.org/10.1074/jbc.M605926200
  • Primary Citation of Related Structures:  
    2GYY, 2GZ1, 2GZ2, 2GZ3

  • PubMed Abstract: 

    Aspartate-beta-semialdehyde dehydrogenase (ASADH) catalyzes a critical branch point transformation in amino acid bio-synthesis. The products of the aspartate pathway are essential in microorganisms, and this entire pathway is absent in mammals, making this enzyme an attractive target for antibiotic development. The first structure of an ASADH from a Gram-positive bacterium, Streptococcus pneumoniae, has now been determined. The overall structure of the apoenzyme has a similar fold to those of the Gram-negative and archaeal ASADHs but contains some interesting structural variations that can be exploited for inhibitor design. Binding of the coenzyme NADP, as well as a truncated nucleotide analogue, into an alternative conformation from that observed in Gram-negative ASADHs causes an enzyme domain closure that precedes catalysis. The covalent acyl-enzyme intermediate was trapped by soaking the substrate into crystals of the coenzyme complex, and the structure of this elusive intermediate provides detailed insights into the catalytic mechanism.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartate beta-semialdehyde dehydrogenase
A, B
366Streptococcus pneumoniaeMutation(s): 0 
Gene Names: asd
Find proteins for A0A0H2UPS5 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2UPS5 
Go to UniProtKB:  A0A0H2UPS5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2UPS5
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C21 H28 N7 O17 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.709α = 90
b = 99.165β = 100.83
c = 64.525γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
PDB_EXTRACTdata extraction
CrystalCleardata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-15
    Type: Initial release
  • Version 1.1: 2008-02-06
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description