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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Related Experiment Video

Updated: Jun 2, 2026

Bimolecular Fluorescence Complementation
08:54

Bimolecular Fluorescence Complementation

Published on: April 15, 2011

Bimolecular fluorescence complementation.

Katy A Wong1, John P O'Bryan

  • 1Department of Pharmacology, University of Illinois at Chicago, USA.

Journal of Visualized Experiments : Jove
|April 29, 2011
PubMed
Summary
This summary is machine-generated.

Bimolecular Fluorescence Complementation (BiFC) visualizes protein complex localization within cells. This method offers advantages over traditional techniques for studying protein interactions and compartmentalized signaling.

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Last Updated: Jun 2, 2026

Bimolecular Fluorescence Complementation
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Published on: April 15, 2011

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Area of Science:

  • Cellular and Molecular Biology
  • Biochemistry
  • Biophysics

Background:

  • Understanding protein complex localization is crucial for deciphering cellular signaling pathways.
  • Conventional methods like immunoprecipitation lack spatial resolution for complex localization.
  • Existing techniques such as fluorescence co-localization and Förster Resonance Energy Transfer (FRET) have limitations including high background noise and technical challenges.

Purpose of the Study:

  • To highlight Bimolecular Fluorescence Complementation (BiFC) as a superior method for visualizing subcellular protein complex distribution.
  • To compare BiFC with alternative protein-protein interaction assays.

Main Methods:

  • BiFC involves splitting a fluorescent protein into two non-fluorescent fragments, fused to proteins of interest.
  • Upon interaction, the fragments complement, reconstituting fluorescence and indicating complex localization.
  • Comparison with co-localization, FRET, and Bioluminescence Resonance Energy Transfer (BRET) methods.

Main Results:

  • BiFC effectively monitors protein complex interaction and subcellular compartmentalization.
  • BiFC offers advantages over co-localization and FRET, including minimal background fluorescence and simpler image processing.
  • BiFC can detect weak or transient interactions and does not require high protein overexpression.

Conclusions:

  • BiFC is an excellent method for visualizing the subcellular localization of protein complexes.
  • This technique provides valuable insights into compartmentalized signaling dynamics.
  • BiFC overcomes several limitations of other protein-protein interaction assays.