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The FASEB Journal, Vol 7, 1247-1256, Copyright © 1993 by The Federation of American Societies for Experimental Biology

REVIEWS

Aspartylglycosaminuria: protein chemistry and molecular biology of the most common lysosomal storage disorder of glycoprotein degradation

I Mononen, KJ Fisher, V Kaartinen and NN Aronson Jr
Department of Clinical Chemistry, University of Kuopio, Finland.

Aspartylglycosaminuria (AGU) (McKusick 20840) is the most common disorder of glycoprotein degradation caused by the failure of lysosomes to digest the protein-to-carbohydrate linkage of Asn-linked glycoproteins. During the past few years there has been significant progress in our understanding of both the protein chemistry and molecular biology of glycosylasparaginase (EC 3.5.1.26) as well as the molecular changes underlying the storage disease AGU that results from deficiency of this lysosomal hydrolase. Modern clinical assays have been developed for the diagnosis and carrier detection of this disease. Detailed structure, substrate specificity, mechanism of action, and a part of the active site of glycosylasparaginase have been defined. Molecular biology of glycosylasparaginase has progressed rapidly and already some mutations in the glycosylasparaginase gene resulting in AGU have been identified. Evolutionary aspects based on sequence data indicate a mechanistic relationship between mammalian glycosylasparaginases and bacterial/plant asparaginases.


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Copyright © 1993 by The Federation of American Societies for Experimental Biology.