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BioID: A Screen for Protein-Protein Interactions.

Kyle J Roux1,2, Dae In Kim1, Brian Burke3

  • 1Children's Health Research Center, Sanford Research, North Sioux Falls, South Dakota.

Current Protocols in Protein Science
|March 9, 2018
PubMed
Summary

BioID is a proximity-dependent biotinylation method for identifying protein interactions in living cells. This technique uses a promiscuous biotin ligase to label and isolate candidate interacting proteins.

Keywords:
BioIDbiotinylationprotein-protein interactionproximity-dependent labeling

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Protein interactions are crucial for cellular functions.
  • Identifying physiologically relevant interactions within living cells remains challenging.
  • Existing methods may not capture weak, transient, or insoluble protein interactions.

Purpose of the Study:

  • To introduce and describe the BioID technique for screening protein interactions.
  • To highlight BioID's ability to identify proximal endogenous proteins in a proximity-dependent manner.
  • To showcase BioID's versatility in studying various interaction types and cell systems.

Main Methods:

  • Fusion of a promiscuous biotin ligase to a protein of interest.
  • Expression of the fusion protein in living cells.
  • Proximity-dependent biotinylation of endogenous proteins.
  • Isolation and identification of biotinylated proteins via biotin-affinity capture.

Main Results:

  • BioID successfully identifies candidate interacting proteins based on proximity.
  • The method is effective for insoluble proteins and weak/transient interactions.
  • BioID allows for temporal regulation of interaction screening.
  • Demonstrated applicability in mammalian cells with potential for diverse cell types.

Conclusions:

  • BioID is a powerful tool for discovering physiologically relevant protein interactions in vivo.
  • Its unique mechanism enables the capture of previously difficult-to-study interactions.
  • BioID offers broad applicability across different cell types and species for proteomic studies.