| Structural highlights
1k62 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Related: | 1aos, 1hy1, 1hy0, 1auw, 1dcn, 1i0a |
| Activity: | Argininosuccinate lyase, with EC number 4.3.2.1 |
| Resources: | FirstGlance, OCA, RCSB, PDBsum |
Disease
[ARLY_HUMAN] Defects in ASL are the cause of arginosuccinic aciduria (ARGINSA) [MIM:207900]. An autosomal recessive disorder of the urea cycle. The disease is characterized by mental and physical retardation, liver enlargement, skin lesions, dry and brittle hair showing trichorrhexis nodosa microscopically and fluorescing red, convulsions, and episodic unconsciousness.[1] [2] [3] [4]
Function
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
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.
Three-dimensional structure of the argininosuccinate lyase frequently complementing allele Q286R.,Sampaleanu LM, Vallee F, Thompson GD, Howell PL Biochemistry. 2001 Dec 25;40(51):15570-80. PMID:11747432[5]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Barbosa P, Cialkowski M, O'Brien WE. Analysis of naturally occurring and site-directed mutations in the argininosuccinate lyase gene. J Biol Chem. 1991 Mar 15;266(8):5286-90. PMID:1705937
- ↑ Walker DC, McCloskey DA, Simard LR, McInnes RR. Molecular analysis of human argininosuccinate lyase: mutant characterization and alternative splicing of the coding region. Proc Natl Acad Sci U S A. 1990 Dec;87(24):9625-9. PMID:2263616
- ↑ Kleijer WJ, Garritsen VH, Linnebank M, Mooyer P, Huijmans JG, Mustonen A, Simola KO, Arslan-Kirchner M, Battini R, Briones P, Cardo E, Mandel H, Tschiedel E, Wanders RJ, Koch HG. Clinical, enzymatic, and molecular genetic characterization of a biochemical variant type of argininosuccinic aciduria: prenatal and postnatal diagnosis in five unrelated families. J Inherit Metab Dis. 2002 Sep;25(5):399-410. PMID:12408190
- ↑ Trevisson E, Salviati L, Baldoin MC, Toldo I, Casarin A, Sacconi S, Cesaro L, Basso G, Burlina AB. Argininosuccinate lyase deficiency: mutational spectrum in Italian patients and identification of a novel ASL pseudogene. Hum Mutat. 2007 Jul;28(7):694-702. PMID:17326097 doi:10.1002/humu.20498
- ↑ Sampaleanu LM, Vallee F, Thompson GD, Howell PL. Three-dimensional structure of the argininosuccinate lyase frequently complementing allele Q286R. Biochemistry. 2001 Dec 25;40(51):15570-80. PMID:11747432
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