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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Structural Insights into Notch Receptor-Ligand Interactions.

Penny A Handford1, Boguslawa Korona2, Richard Suckling3

  • 1Department of Biochemistry, University of Oxford, Oxford, OX1 3RE, UK. penny.handford@bioch.ox.ac.uk.

Advances in Experimental Medicine and Biology
|July 22, 2018
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Summary

The Notch receptor

Keywords:
C2 domainCalcium bindingEGF12FringeLipid binding

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Area of Science:

  • Cellular biology
  • Molecular biology
  • Structural biology

Background:

  • Notch receptor signaling is crucial for cell-cell communication.
  • Early studies identified epidermal growth factor-like (EGF) domains 11 and 12 as key for Notch ligand binding.

Purpose of the Study:

  • To define the molecular basis of Notch receptor-ligand interaction.
  • To elucidate the structural architecture of the Notch complex at the cell surface.
  • To understand the role of O-glycosylation in Notch signaling.

Main Methods:

  • Protein expression and purification
  • Structure determination (e.g., X-ray crystallography, cryo-EM)
  • Functional assays

Main Results:

  • Notch EGF11 and 12 interact with Delta/Serrate/LAG-2 (DSL) and C2 domains of ligands.
  • Membrane-binding and additional protein interactions modulate Notch signal generation.
  • O-glycosylation directly impacts the binding interface and domain stability, influencing Notch activity.

Conclusions:

  • The core Notch-ligand interaction involves specific EGF and DSL/C2 domains.
  • O-glycosylation plays a significant role in modulating Notch binding and signaling.
  • Future research should focus on the complete extracellular architecture, lipid binding, and pathologies related to Notch pathway mutations.