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. 1987 Dec 15;248(3):755–764. doi: 10.1042/bj2480755

Human N-acetylgalactosamine-4-sulphate sulphatase. Purification, monoclonal antibody production and native and subunit Mr values.

G J Gibson 1, G T Saccone 1, D A Brooks 1, P R Clements 1, J J Hopwood 1
PMCID: PMC1148614  PMID: 3435483

Abstract

Initial purification of N-acetylgalactosamine-4-sulphate sulphatase from human liver homogenates containing approx. 1 mg of enzyme in 26 g of soluble proteins was achieved by a six-column chromatography procedure and yielded approx. 40 micrograms of a single major protein species. Enzyme thus prepared was used to produce N-acetylgalactosamine-4-sulphate sulphatase-specific monoclonal antibodies. The use of a monoclonal antibody linked to a solid support facilitated the purification of approx. 0.5 mg of N-acetylgalactosamine-4-sulphate sulphatase from a similar liver homogenate. Moreover the enzyme isolated contained a single protein species, shown by SDS/polyacrylamide-gel electrophoresis to have an Mr of 57,000, which dissociated into subunits of Mr 43,000 and 13,000 in the presence of reducing agents. Essentially identical enzyme preparations were isolated from homogenates of human kidney and lung and from concentrated human urine. The native protein Mr of enzyme from human liver and kidney was assessed by gel-permeation chromatography to be 43,000 on Ultrogel AcA and Bio-Gel P-150. The liver N-acetylgalactosamine-4-sulphate sulphatase was shown to have pH optima of approx. 4 and 5.5 with the oligosaccharide substrate (GalNAc4S-GlcA-GalitolNAc4S) and fluorogenic substrate (methylumbelliferyl sulphate) respectively. Km values of 60 microM and 4 mM and Vmax. values of 2 and 20 mumol/min per mg were determined with the oligosaccharide and fluorogenic substrates respectively.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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