Abstract
In humans, the quantity of α-l-fucosidase in serum is determined by heredity. The mechanism controlling levels of the enzyme in serum is unknown. Lymphoid cell lines derived from individuals with either low, intermediate, or high α-l-fucosidase in serum were established. Steady-state levels of intracellular and extracellular α-l-fucosidase as well as rates of synthesis and secretion of enzyme overlapped among the cell lines. Thus,vivo} serum phenotypes were not expressed in this system. No appreciable differences in the qualitative processing of newly made α-l-fucosidase were observed among these lymphoid cell lines. Cells pulse-labeled with35S-methionine from 0.25 to 2 hr had an intracellular form of enzyme with aM r=58,000. Cells pulsed for 1.5 hr and chased for 21 hr with unlabeled methionine had an intracellular form ofM r=60,000 and an extracellular form ofM r=62,000. All three enzyme forms were glycoproteins with a common polypeptide chain ofM r=52,000 but with different carbohydrate moieties. No evidence for a high molecular mass precursor form of α-l-fucosidase was found. Fucosidosis is a rare, inherited disease in which α-l-fucosidase activity in tissues and body fluids is low or absent. The mutations for fucosidosis and the serum polymorphism map separately. Lymphoid cells from two siblings with fucosidosis had 8-fold to 341-fold less intracellular α-l-fucosidase protein with 11-fold to 56-fold lower specific activities than control cells. Residual mutant enzyme was a glycoprotein with a polypeptide chain virtually the same size (M r=52,000) as control enzyme. However, residual mutant enzyme was hypoglycosylated and hypersecreted as compared to control enzyme.
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This research was supported by National Institutes of Health Grant DK 32161.
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DiCioccio, R.A., Brown, K.S. Biosynthesis, processing, and extracellular release of α-l-fucosidase in lymphoid cell lines of different genetic origins. Biochem Genet 26, 401–420 (1988). https://doi.org/10.1007/BF02401794
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DOI: https://doi.org/10.1007/BF02401794