IDS, as known as iduronate 2-sulfatase isoform, is a member of the highly conserved sulfatase family of enzymes that catalyze the hydrolysis of O-sulfate and N-salfate esters from a varity of substrates. This protein is required for the lysosomal degradation of the glycosaminoglycans (GAG) heparan sulfate and dermatan sulfate. It hydrolyzes the 2-sulfate group of the IDS units of the GAG. Recombinant human IDS, fused to His-tag at C-terminus, was expressed in insect cell and purified by using conventional chromatography techniques.