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Argininosuccinate lyase

Argininosuccinate lyase
Symbol ASL
Entrez 435
HUGO 746
OMIM 608310
RefSeq NM_000048
UniProt P04424
Other data
EC number
Locus Chr. 7 pter-q22

ASL (argininosuccinate lyase) is a human gene that makes the protein argininosuccinate lyase, one of the enzymes controlling a series of reactions called the urea cycle. The ASL enzyme starts the reaction in which the amino acid arginine, a building block of proteins, is produced from argininosuccinate:

The urea cycle is a sequence of reactions in the cells of the liver. It processes excess nitrogen, generated when protein is used by the body, to make a compound called urea that is excreted by the kidneys. Eliminating the excess nitrogen in this way prevents it from accumulating in the form of ammonia, which is toxic.

The ASL gene is located on chromosome 7 between the centromere (junction of the long and short arm) and the long (q) arm at position 11.2, from base pair 64,984,963 to base pair 65,002,090.

ASL is related to intragenic complementation.[1][2][3]

Related conditions

Argininosuccinic aciduria is associated with ASL. [4][5]

Several different mutations in the ASL gene have been identified.[6]

A mutated ASL gene may make an argininosuccinate lyase enzyme that is shorter than normal or the wrong shape.

The shape of an enzyme affects its ability to bring other substances together to start a chemical reaction. If the argininosuccinate lyase enzyme is misshapen, it cannot fulfill its role in the urea cycle. Excess nitrogen is not converted to urea for excretion, and toxic ammonia accumulates in the body.


  1. ^ Turner MA, Simpson A, McInnes RR, Howell PL (1997). "Human argininosuccinate lyase: a structural basis for intragenic complementation". Proc Natl Acad Sci U S A 94 (17): 9063-8. PMID 9256435
  2. ^ Yu B, Howell PL (2000). "Intragenic complementation and the structure and function of argininosuccinate lyase". Cell Mol Life Sci 57 (11): 1637-51. PMID 11092456
  3. ^ Yu B, Thompson GD, Yip P, Howell PL, Davidson AR (2001). "Mechanisms for intragenic complementation at the human argininosuccinate lyase locus". Biochemistry 40 (51): 15581-90. PMID 11747433
  4. ^ Reid Sutton V, Pan Y, Davis EC, Craigen WJ (2003). "A mouse model of argininosuccinic aciduria: biochemical characterization". Mol Genet Metab 78 (1): 11-6. PMID 12559843
  5. ^ Tanaka T, Nagao M, Mori T, Tsutsumi H (2002). "A novel stop codon mutation (X465Y) in the argininosuccinate lyase gene in a patient with argininosuccinic aciduria". Tohoku J Exp Med 198 (2): 119-24. PMID 12512996
  6. ^ Linnebank M, Tschiedel E, Haberle J, Linnebank A, Willenbring H, Kleijer WJ, Koch HG (2002). "Argininosuccinate lyase (ASL) deficiency: mutation analysis in 27 patients and a completed structure of the human ASL gene". Hum Genet 111 (4-5): 350-9. PMID 12384776
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Argininosuccinate_lyase". A list of authors is available in Wikipedia.
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