Iduronidase

Iduronidase is an enzyme that plays a crucial role in the lysosomal breakdown of glycosaminoglycans (GAGs). It is specifically responsible for the hydrolysis of the glycosidic bond in the GAGs dermatan sulfate and heparan sulfate.

Function

Iduronidase is a lysosomal enzyme that catalyzes the hydrolysis of the glycosidic bond in dermatan sulfate and heparan sulfate. These GAGs are long, unbranched polysaccharides that are involved in various biological processes, including cell signaling, cell adhesion, and the regulation of cell growth and proliferation. By breaking down these GAGs, iduronidase helps to maintain the normal function of cells and tissues.

Clinical significance

Deficiency of iduronidase leads to a rare genetic disorder known as Mucopolysaccharidosis type I (MPS I). MPS I is characterized by the accumulation of dermatan sulfate and heparan sulfate in various tissues and organs, leading to a wide range of symptoms, including skeletal abnormalities, heart disease, and cognitive impairment.

Treatment for MPS I involves enzyme replacement therapy with a synthetic form of iduronidase, known as laronidase. Laronidase is designed to replace the missing or deficient iduronidase, thereby helping to break down the accumulated GAGs and alleviate the symptoms of MPS I.

See also

• Lysosomal storage disease
• Glycosaminoglycan
• Mucopolysaccharidosis