Chapter title |
Ganglioside Metabolism and Its Inherited Diseases
|
---|---|
Chapter number | 5 |
Book title |
Gangliosides
|
Published in |
Methods in molecular biology, January 2018
|
DOI | 10.1007/978-1-4939-8552-4_5 |
Pubmed ID | |
Book ISBNs |
978-1-4939-8551-7, 978-1-4939-8552-4
|
Authors |
Bernadette Breiden, Konrad Sandhoff, Breiden, Bernadette, Sandhoff, Konrad |
Abstract |
Gangliosides are sialic acid containing glycosphingolipids, which are abundant in mammalian brain tissue. Several fatal human diseases are caused by defects in glycolipid metabolism. Defects in their degradation lead to an accumulation of metabolites upstream of the defective reactions, whereas defects in their biosynthesis lead to diverse problems in a large number of organs.Gangliosides are primarily positioned with their ceramide anchor in the neuronal plasma membrane and the glycan head group exposed on the cell surface. Their biosynthesis starts in the endoplasmic reticulum with the formation of the ceramide anchor, followed by sequential glycosylation reactions, mainly at the luminal surface of Golgi and TGN membranes, a combinatorial process, which is catalyzed by often promiscuous membrane-bound glycosyltransferases.Thereafter, the gangliosides are transported to the plasma membrane by exocytotic membrane flow. After endocytosis, they are degraded within the endolysosomal compartments by a complex machinery of degrading enzymes, lipid-binding activator proteins, and negatively charged lipids. |
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