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Glucosamine-6-sulphatase is an exo-hydrolase required for the lysosomal degradation of heparan sulphate and keratan sulphate. Deficiency of glucosamine-6-sulphatase activity leads to the lysosomal storage of the glycosaminoglycan, heparan sulphate and the monosaccharide sulphate N-acetylglucosamine 6-sulphate and the autosomal recessive genetic disorder mucopolysaccharidosis type IIID. Glucosamine-6-sulphatase can be classified as a non-arylsulphatase since, relative to arylsulphatase B, it shows negligible activity toward 4-methylumbelliferyl sulphate. We have isolated human cDNA clones and derived amino acid sequence coding for the entire glucosamine-6-sulphatase protein. The predicted sequence has 552 amino acids with a leader peptide of 36 amino acids and contains 13 potential N-glycosylation sites, of which it is likely that 10 are used. Glucosamine-6-sulphatase shows strong sequence similarity to other sulphatases such as the family of arylsulphatases, although the degree of similarity is not as high as that between members of the arylsulphatase family. This pattern of inter- and intra-family similarity delineates regions and amino acid residues that may be critical for sulphatase function and substrate specificity.

A cDNA clone for human glucosamine-6-sulphatase reveals differences between arylsulphatases and non-arylsulphatases