Key Points
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Various types of mammalian extracellular glycan are produced in the secretory pathway. This Review covers the enzymatic synthesis of glycans and the mechanisms by which cellular glycans are regulated.
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The basic framework by which glycan structures can control molecular interactions is provided, with examples of glycoprotein conformation, glycoprotein maturation and the binding of glycan receptors known as lectins.
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The roles of mammalian glycans in the innate and adaptive immune systems are reviewed, as well as examples of glycan-dependent functions in the ontogeny of various immune cell types.
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This Review encompasses a discussion and tabulation of mammalian glycan linkages, the enzymes that produce them and their cognate recognition molecules that include lectin receptors, in the context of the immune system.
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The role of mammalian glycosylation in controlling the activation of intracellular phosphorylation and signal-transduction pathways is detailed. We review the molecular mechanisms that explain how the glycosylation of cell-surface molecules can govern the assembly and function of glycoprotein signalling complexes.
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Important outstanding questions and unexplored areas are discussed in the context of current methodologies and potential future technologies. We discuss examples of how blocking single enzymes in mammalian glycosylation can either elicit or prevent diseases of the immune system.
Abstract
Glycosylation produces a diverse and abundant repertoire of glycans, which are collectively known as the glycome. Glycans are one of the four fundamental macromolecular components of all cells, and are highly regulated in the immune system. Their diversity reflects their multiple biological functions that encompass ligands for proteinaceous receptors known as lectins. Since the discovery that selectins and their glycan ligands are important for the regulation of leukocyte trafficking, it has been shown that additional features of the vertebrate immune system are also controlled by endogenous cellular glycosylation. This Review focuses on the emerging immunological roles of the mammalian glycome.
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15 October 2008
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Acknowledgements
We apologize to the colleagues and researchers who have made contributions that were not referenced owing to space limitations. J.D.M. is supported by the Howard Hughes Medical Institute and grants from the National Institutes of Health, USA (HL57345, HL78784 and GM62116).
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FURTHER INFORMATION
Glossary
- Glycome
-
The biological repertoire of glycan structures.
- Experimental autoimmune encephalomyelitis
-
An experimental model of multiple sclerosis. Autoimmune disease is induced in animals by immunization with myelin or peptides derived from myelin. The animals develop a paralytic disease with inflammation and demyelination in the brain and spinal cord.
- Immunoreceptor tyrosine-based inhibitory motif
-
(ITIM). A short amino-acid sequence (the consensus sequence of which is V/IXYXXV/L, in which X denotes any amino acid) that is found in the cytoplasmic tail of inhibitory receptors. ITIMs are thought to mediate inhibitory signalling by recruiting phosphatases such as SHP1 (SRC-homology-2-domain-containing protein tyrosine phosphatase 1).
- Clathrin-enriched microdomain
-
A region of the plasma membrane that is associated with clathrin-dependent endocytic mechanisms of protein trafficking and turnover.
- IgA nephropathy
-
An inflammatory disease of the kidney that is associated with the glomerular deposition of IgA.
- Old-world primates
-
A grouping of primates, which includes humans, that are native to Africa and Asia.
- Henoch–Schönlein
-
An inflammatory disease that involves the blood vessels and causes vasculitis.
- Hodgkin's lymphoma
-
A type of lymphoma that is characterized by the presence of Reed–Sternberg cells (derived from B cells) and that spreads between the lymph nodes.
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Marth, J., Grewal, P. Mammalian glycosylation in immunity. Nat Rev Immunol 8, 874–887 (2008). https://doi.org/10.1038/nri2417
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DOI: https://doi.org/10.1038/nri2417
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