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Related Concept Videos

Protein Networks02:26

Protein Networks

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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
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Protein-protein Interfaces02:04

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Related Experiment Video

Updated: Jun 21, 2025

Characterization of Neuronal Lysosome Interactome with Proximity Labeling Proteomics
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Mapping the IMiD-dependent cereblon interactome using BioID-proximity labelling.

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  • 1Monash Haematology, Monash Health, Clayton, Australia.

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|July 8, 2024
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Summary

Immunomodulatory imide drugs (IMiDs) target cereblon (CRBN) in multiple myeloma. New proximity labeling identified MYH9 as a novel CRBN

Keywords:
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Immunomodulatory imide drugs (IMiDs) are crucial for multiple myeloma (MM) therapy.
  • IMiDs function by binding cereblon (CRBN), an E3 ligase adaptor, altering substrate specificity and degrading key MM transcription factors.
  • Understanding IMiD toxicities requires deeper mechanistic insight beyond therapeutic targets.

Purpose of the Study:

  • To characterize the CRBN interactome using BioID2-dependent proximity labeling (BioID2-CRBN) in the presence and absence of IMiDs and bortezomib.
  • To identify novel CRBN interactions and potential contributors to IMiD-associated toxicities.
  • To establish proximity labeling as a tool for mechanistic profiling of E3 ligase-modulating drugs.

Main Methods:

  • Utilized BioID2-CRBN proximity labeling to map protein interactions with CRBN.
  • Analyzed CRBN interactome changes induced by IMiDs and the proteasome inhibitor bortezomib in MM cells.
  • Identified biotinylated proteins and characterized novel CRBN-protein interactions.

Main Results:

  • BioID2-CRBN successfully biotinylated known CRBN interactors and neosubstrates upon IMiD treatment.
  • Bortezomib alone significantly altered the CRBN interactome.
  • Identified 'neointeractors'—proteins augmented in interaction with CRBN by IMiDs but not degraded—distinct from neosubstrates.
  • Discovered Non-Muscle Myosin Heavy Chain IIA (MYH9) as a putative CRBN neointeractor.

Conclusions:

  • Proximity labeling with BioID2-CRBN provides a powerful approach to map drug-induced changes in E3 ligase interactomes.
  • MYH9 is identified as a novel CRBN neointeractor potentially contributing to IMiD-related hematological toxicities.
  • These findings advance the mechanistic understanding of IMiD action and toxicity, paving the way for improved therapeutic strategies.