Chapter title |
Structural Insights into Notch Receptor-Ligand Interactions
|
---|---|
Chapter number | 2 |
Book title |
Molecular Mechanisms of Notch Signaling
|
Published in |
Advances in experimental medicine and biology, January 2018
|
DOI | 10.1007/978-3-319-89512-3_2 |
Pubmed ID | |
Book ISBNs |
978-3-31-989511-6, 978-3-31-989512-3
|
Authors |
Penny A. Handford, Boguslawa Korona, Richard Suckling, Christina Redfield, Susan M. Lea |
Abstract |
Pioneering cell aggregation experiments from the Artavanis-Tsakonas group in the late 1980's localized the core ligand recognition sequence in the Drosophila Notch receptor to epidermal growth factor-like (EGF) domains 11 and 12. Since then, advances in protein expression, structure determination methods and functional assays have enabled us to define the molecular basis of the core receptor/ligand interaction and given new insights into the architecture of the Notch complex at the cell surface. We now know that Notch EGF11 and 12 interact with the Delta/Serrate/LAG-2 (DSL) and C2 domains of ligand and that membrane-binding, together with additional protein-protein interactions outside the core recognition domains, are likely to fine-tune generation of the Notch signal. Furthermore, structure determination of O-glycosylated variants of Notch alone or in complex with receptor fragments, has shown that these sugars contribute directly to the binding interface, as well as to stabilizing intra-molecular domain structure, providing some mechanistic insights into the observed modulatory effects of O-glycosylation on Notch activity.Future challenges lie in determining the complete extracellular architecture of ligand and receptor in order to understand (i) how Notch/ligand complexes may form at the cell surface in response to physiological cues, (ii) the role of lipid binding in stabilizing the Notch/ligand complex, (iii) the impact of O-glycosylation on binding and signalling and (iv) to dissect the different pathologies that arise as a consequence of mutations that affect proteins involved in the Notch pathway. |
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Immunology and Microbiology | 1 | 3% |
Other | 0 | 0% |
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