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Related Experiment Video

Updated: Jul 20, 2025

Bimolecular Fluorescence Complementation
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Published on: April 15, 2011

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Bimolecular Fluorescence Complementation Assay to Evaluate HSP90-Client Protein Interactions in Cells.

Abir Chakraborty1, Gregory L Blatch1,2,3, Adrienne L Edkins4

  • 1Biomedical Biotechnology Research Unit (BioBRU), Department of Biochemistry and Microbiology, Rhodes University, Makhanda, South Africa.

Methods in Molecular Biology (Clifton, N.J.)
|August 4, 2023
PubMed
Summary

Bimolecular Fluorescence Complementation (BiFC) visualizes protein-protein interactions in cells. This study applies BiFC to analyze chaperone-client protein networks, specifically Hsp90 and CDK4 interactions.

Keywords:
BiFCCDK4HSP90PPIProtein–protein interactions

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein-protein interactions (PPI) are crucial for cellular functions and maintaining proteostasis.
  • Molecular chaperones, co-chaperones, and client proteins form PPI networks essential for protein homeostasis.
  • Visualizing and analyzing PPIs in cells aids in understanding protein homeostasis regulation.

Purpose of the Study:

  • To describe the application of the Bimolecular Fluorescence Complementation (BiFC) assay for studying PPIs in live or fixed cells.
  • To demonstrate the utility of BiFC in analyzing chaperone-client interactions, using Hsp90 and CDK4 as a model system.
  • To enable spatiotemporal analysis of protein complexes and the impact of inhibitors or mutations on these networks.

Main Methods:

  • Utilized the Bimolecular Fluorescence Complementation (BiFC) assay.
  • Developed a BiFC assay to detect interactions between Hsp90 (chaperone) and CDK4 (client protein).
  • Applied the assay to live and fixed cells for distribution and spatiotemporal analysis of protein complexes.

Main Results:

  • Successfully applied the BiFC assay to visualize Hsp90-CDK4 complexes in cells.
  • Demonstrated the capability of BiFC for spatiotemporal analysis of chaperone-client interactions.
  • Showcased the assay's amenability to studying the effects of inhibitors and mutations on protein networks.

Conclusions:

  • The BiFC assay is a valuable tool for studying protein-protein interactions in live or fixed cells.
  • This method enables detailed analysis of chaperone-client interactions, such as Hsp90-CDK4.
  • BiFC facilitates the investigation of factors influencing chaperone-client protein networks, including inhibitors and mutations.