Heparan sulfate (terminal N-sulfoglucosamine sulfate) (HS)

Heparan sulfate oligosaccharides with terminal N-sulfoglucosamine sulfate residues are specific carbohydrate structures that serve as substrates for the lysosomal enzyme sulfamidase (SGSH). In the normal metabolic pathway, these residues are degraded through the sequential action of various hydrolases, starting with the removal of the N-sulfate group. However, in individuals with Mucopolysaccharidosis type IIIA (MPS IIIA), also known as Sanfilippo syndrome Type A, a deficiency in sulfamidase leads to the pathological accumulation of these partially degraded oligosaccharides within lysosomes. This accumulation is particularly toxic to neurons, leading to severe and progressive neurodegeneration, cognitive decline, and behavioral issues. Therapeutic interventions, such as enzyme replacement therapy (ERT) and gene therapy, aim to provide functional sulfamidase to catalyze the breakdown of these residues. Monitoring the levels of these oligosaccharides in the cerebrospinal fluid and urine is a critical biomarker for assessing disease progression and treatment efficacy.

Other names

Heparan sulfate oligosaccharides at terminal N-sulfoglucosamine sulfate residuesN-sulfated heparan sulfateSanfilippo A substrateHeparan sulfate N-sulfate

Enzymatic hydrolysis of the N-sulfate group from the terminal glucosamine residue at the non-reducing end of heparan sulfate chains.