Crystal Structure of the Human Argininosuccinate Lyase Q286R Mutant

Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.175 

Starting Model: experimental
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Three-dimensional structure of the argininosuccinate lyase frequently complementing allele Q286R.

Sampaleanu, L.M.Vallee, F.Thompson, G.D.Howell, P.L.

(2001) Biochemistry 40: 15570-15580

  • DOI: https://doi.org/10.1021/bi011525m
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Argininosuccinate lyase (ASL) catalyzes the reversible breakdown of argininosuccinate to arginine and fumarate, a reaction involved in the biosynthesis of arginine in all species and in the production of urea in ureotelic species. In humans, mutations in the enzyme result in the autosomal recessive disorder argininosuccinic aciduria. Intragenic complementation has been demonstrated to occur at the ASL locus, with two distinct classes of ASL-deficient strains having been identified, the frequent and high-activity complementers. The frequent complementers participate in the majority of the complementation events observed and were found to be either homozygous or heterozygous for a glutamine to arginine mutation at residue 286. The three-dimensional structure of the frequently complementing allele Q286R has been determined at 2.65 A resolution. This is the first high-resolution structure of human ASL. Comparison of this structure with the structures of wild-type and mutant duck delta1 and delta2 crystallins suggests that the Q286R mutation may sterically and/or electrostatically hinder a conformational change in the 280's loop (residues 270-290) and domain 3 that is thought to be necessary for catalysis to occur. The comparison also suggests that residues other than R33, F333, and D337 play a role in maintaining the structural integrity of domain 1 and reinforces the suggestion that residues 74-89 require a particular conformation for catalysis. The electron density has enabled the structure of residues 6-18 to be modeled for the first time. Residues 7-9 and 15-18 are in type IV beta-turns and are connected by a loop. The conformation observed is stabilized, in part, by a salt bridge between the side chains of R12 and D18. Although the disease causing mutation R12Q would disrupt this salt bridge, it is unclear why this mutation has such a significant effect on the catalytic activity as residues 1-18 are disordered in all other delta-crystallin structures determined to date.

  • Organizational Affiliation

    Structural Biology and Biochemistry, Hospital for Sick Children, 555 University Avenue, Toronto, M5G 1X8, Ontario, Canada.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Argininosuccinate Lyase
A, B
464Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for P04424 (Homo sapiens)
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Go to UniProtKB:  P04424
GTEx:  ENSG00000126522 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04424
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.65 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.175 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.202α = 90
b = 104.202β = 90
c = 183.019γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-02-01
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references
  • Version 1.4: 2023-08-16
    Changes: Data collection, Refinement description