Argininosuccinate lyase

Argininosuccinate lyase (ASL) is an enzyme that plays a key role in the urea cycle, a process that helps the body eliminate harmful ammonia. This enzyme performs the fourth step of the urea cycle, which is the breakdown of a molecule called argininosuccinate into two smaller molecules, arginine and fumarate. The arginine is used to make urea, which is excreted in urine, and the fumarate is used in other cellular processes.

Function

The ASL enzyme is found in the cytoplasm of liver cells and cells in the kidneys. It is involved in the urea cycle, a sequence of reactions that occurs in liver cells. The urea cycle processes excess nitrogen, generated when proteins are used by the body, to make a compound called urea that is excreted by the kidneys.

In the urea cycle, the ASL enzyme catalyzes the fourth reaction step, the breakdown of argininosuccinate into arginine and fumarate. This is a crucial step in the process of removing nitrogen from the body.

Clinical significance

Mutations in the ASL gene cause argininosuccinate lyase deficiency, a disorder characterized by an inability to effectively break down proteins, leading to an accumulation of ammonia in the blood (hyperammonemia). This can cause neurological problems and damage to the liver.

See also

• Urea cycle
• Argininosuccinate lyase deficiency
• Hyperammonemia

References

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