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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
N-acetylgalactosamine-6-sulfate sulfatase in human placenta: purification and characteristics.
Journal of Biochemistry 1991 December
N-Acetylgalactosamine-6-sulfate sulfatase from human placenta was purified 33,600-fold using beta-N-acetyl-D-galactosamine 6-sulfate-(1----4)-beta-D-glucuronic acid-(1----3)-N-acetyl-D-[3H]galactosaminitol 6-sulfate as the substrate. This enzyme is an oligomer with a molecular mass of 120 kDa and consists of polypeptides of 40 and 15 kDa. The 15 kDa polypeptide is a glycoprotein. This purified protein has activities of N-acetylgalactosamine-6-sulfate sulfatase and galactose-6-sulfate sulfatase. Rabbit antiserum was raised against the purified protein. The antibody titrated N-acetylgalactosamine-6-sulfate sulfatase and galactose-6-sulfate sulfatase. The size of the precursor of the enzyme is 60 kDa, as determined by cell-free translation. The optimal pH values of the N-acetylgalactosamine-6-sulfate sulfatase and galactose-6-sulfate sulfatase activities are pH 3.8-4.0, and the Kms are 8 and 13 microM, respectively. Sulfate and phosphate ions are potent competitive inhibitors for the enzyme and their inhibition constants are 35 and 200 microM, respectively. Cross-reactive materials of 40 and 15 kDa were detected by immunoblot analysis, in the placenta, liver, and normal fibroblasts, but not in fibroblasts from a patient with Morquio disease.
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