Crystal structure of human argininosuccinate synthase in complex with aspartate and citrulline

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.198 

Starting Model: experimental
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Structure of human argininosuccinate synthetase.

Karlberg, T.Collins, R.van den Berg, S.Flores, A.Hammarstrom, M.Hogbom, M.Holmberg Schiavone, L.Uppenberg, J.

(2008) Acta Crystallogr D Biol Crystallogr 64: 279-286

  • DOI: https://doi.org/10.1107/S0907444907067455
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Argininosuccinate synthetase catalyzes the transformation of citrulline and aspartate into argininosuccinate and pyrophosphate using the hydrolysis of ATP to AMP and pyrophosphate. This enzymatic process constitutes the rate-limiting step in both the urea and arginine-citrulline cycles. Previous studies have investigated the crystal structures of argininosuccinate synthetase from bacterial species. In this work, the first crystal structure of human argininosuccinate synthetase in complex with the substrates citrulline and aspartate is presented. The human enzyme is compared with structures of argininosuccinate synthetase from bacteria. In addition, the structure also provides new insights into the function of the numerous clinical mutations identified in patients with type I citrullinaemia (also known as classic citrullinaemia).

  • Organizational Affiliation

    Structural Genomics Consortium, Karolinska Institutet, MBB/SGC, 171 77 Stockholm, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Argininosuccinate synthase413Homo sapiensMutation(s): 0 
Gene Names: ASS1ASS
UniProt & NIH Common Fund Data Resources
Find proteins for P00966 (Homo sapiens)
Explore P00966 
Go to UniProtKB:  P00966
GTEx:  ENSG00000130707 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00966
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.198 
  • Space Group: F 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.94α = 90
b = 117.47β = 90
c = 155.15γ = 90
Software Package:
Software NamePurpose
MAR345data collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-05
    Type: Initial release
  • Version 1.1: 2008-02-20
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection