Protein Fragment Complementation
Protein Fragment Complementation - Related Videos
08:38
Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells
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Cited by 27 •
2015
Proteins interact with each other and these interactions determine in a large part their functions. Protein interaction partners can be identified at high-throughput in vivo using a yeast fitness assay based on the dihydrofolate reductase protein-fragment complementation assay (DHFR-PCA).
04:29
Bimolecular Complementation Affinity Purification to Isolate Two Interacting Proteins
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2025
In this video, we have demonstrated bimolecular complementation affinity purification, BiCAP, to detect and isolate specific protein dimers using conformation-specific single-domain antibodies.
11:11
Flow Cytometric Analysis of Bimolecular Fluorescence Complementation: A High Throughput Quantitative Method to Study Protein-protein Interaction
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Cited by 8 •
2013
Flow cytometric analysis of Bimolecular Fluorescence Complementation provides a high throughput quantitative method to study protein-protein interaction. This methodology can be applied to mapping protein binding sites and for screening factors that regulate protein-protein interaction.
04:02
Split Luciferase Complementation Assay to Identify Specific Protein-Protein Interactions
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2025
This video demonstrates the split luciferase complementation assay to detect protein-protein interactions. In this assay, the proteins of interest are tagged to small and large fragments of the luciferase enzyme. When the proteins interact, the large and small fragments combine to form an active enzyme complex, which in the presence of a specific substrate, releases bright luminescence that can be measured.
10:39
Bimolecular Fluorescence Complementation (BiFC) Assay for Protein-Protein Interaction in Onion Cells Using the Helios Gene Gun
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Cited by 18 •
2010
This article illustrates how to properly use the BioRad Helios Gene Gun to introduce plasmid DNA into onion epidermal cells and how to test for protein-protein interactions in onion cells based on the principle of Bimolecular Fluorescence Complementation...
FAQs
The reporter fragments remain functionally incomplete while attached to separate candidate proteins. If those proteins associate, their proximity allows the complementary fragments to reassemble, restoring reporter function. The resulting fluorescence, luminescence, or enzymatic activity provides an experimental signal that indicates the interaction occurred and can be measured for biological analysis.
The method can provide information about when an interaction occurs, where it occurs within living cells, and how strong it is relative to another interaction measured under comparable conditions. These dimensions help connect a protein association to cellular regulation rather than treating the interaction as an isolated yes-or-no observation.
Reporter reassembly can be monitored through fluorescence, luminescence, or enzymatic activity. Each output supplies a measurable indication that the fragments became functional, while the selected signal determines how the interaction is observed experimentally. Using these reporter activities allows researchers to examine protein associations through different detectable readouts without changing the underlying interaction principle.
Measurements made in living cells can connect protein association with cellular location and timing. This context is important because signaling pathways, molecular complexes, and regulatory processes depend on where and when proteins associate. Protein Fragment Complementation therefore helps examine interactions as events occurring within biological systems rather than only as isolated molecular pairings.
A typical workflow links complementary reporter fragments to the candidate proteins, places the resulting constructs in a cellular context, and monitors reporter activity when the proteins associate. Researchers then examine the measurable signal, considering its timing, location, or relative strength. This sequence connects engineered protein pairs with interpretable interaction data.
Researchers can apply Protein Fragment Complementation when they need to investigate signaling pathways, molecular complexes, or broader mechanisms of cellular regulation. The interaction signal helps identify associations that may contribute to these processes, while information about timing and location can relate the observed protein pairing to its role within the cell.
The technique can be used to screen compounds for effects on a specific protein interaction. A change in the reporter signal can indicate that a compound disrupts or stabilizes the association, allowing researchers to examine interaction-modifying activity. This application connects protein interaction analysis with the search for compounds that alter molecular regulation.