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Biosynthesis of Lysosomal Proteinases in Health and Disease
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Lukas Mach
Published/Copyright:
June 1, 2005
Abstract
Proteolytic maturation of lysosomal proteinases is initiated after receptormediated targeting to prelysosomal compartments, while terminal processing occurs upon delivery to lysosomes. These late processing events are impaired in patients suffering from inherited lysosomal disorders, such as sialic acid storage disease and mucolipidosis II (Icell disease). Lysosomes in the affected cells display marked changes in their physiological and morphological properties, with features reminiscent of prelysosomal compartments. This indicates that the absence of mature lysosomes interferes with the final processing steps during the biosynthesis of lysosomal proteinases. Thus, impaired proteinase maturation reflects an incompetent lysosomal apparatus and as such can be seen as a hallmark of lysosomal storage diseases.
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Published Online: 2005-06-01
Published in Print: 2002-05-15
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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- Thyroid Stimulating Hormone Upregulates Secretion of Cathepsin B from Thyroid Epithelial Cells
- Selective Release of Calpain Produced αII-Spectrin (α-Fodrin) Breakdown Products by Acute Neuronal Cell Death
- Altered Storage of Proteases in Mast Cells from Mice Lacking Heparin: A Possible Role for Heparin Carboxypeptidase A Processing
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