Protein-protein Interaction Assay
Protein-protein Interaction Assay - Related Videos
04:49
Proximity Ligation Assay to Study In Situ Protein-Protein Interactions
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2025
This video describes the proximity ligation assay to study in situ protein-protein interactions in nematode cells. The close proximity of the proteins of interest generates the circular DNA template with the help of a PLA probe attached to a secondary antibody. The probe is further amplified using the amplification solution, which produces a long single-stranded DNA followed by the hybridization of the detector probe, enabling the localization of protein-protein interactions in cells.
04:43
β-Lactamase-Based Conductimetric Biosensor Assay for Protein-Protein Interactions
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2025
This video demonstrates a conductimetric biosensor assay to study the interaction of an antibody with a target antigen immobilized on a transducer chip. The biosensor is engineered to have a bifunctional chimeric protein — a β-lactamase enzyme with a functional catalytic site fused to a nanobody for binding to the immobilized target antigen. Upon binding, the catalytic hydrolysis of an antibiotic substrate by the β-lactamase enzyme generates an electrical signal — confirming the...
03:08
Detection of Protein-Protein Interactions in Drosophila Larvae Using a Proximity Ligation Assay
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2025
This video demonstrates the visualization of protein-protein interactions at the Drosophila neuromuscular junction (NMJ) using Proximity Ligation Assay (PLA). After isolating the body walls, interacting proteins are probed with primary antibodies and PLA-conjugated secondary antibodies. The proximity of the interacting proteins facilitates the ligation of probes with connector oligonucleotides, forming circular DNA, which is then amplified by rolling circle amplification. Fluorescent probes...
08:38
Protein Membrane Overlay Assay: A Protocol to Test Interaction Between Soluble and Insoluble Proteins in vitro
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Cited by 6 •
2011
Testing protein-protein interaction is indispensable for dissection of protein functionality. Here, we introduce an in vitro protein-protein binding assay to probe a membrane-immobilized protein with a soluble protein. This assay provides a reliable method to test interaction between an insoluble protein and a protein in solution.
06:34
Tandem Affinity Purification Assay to Study Protein-Protein Interactions
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2025
This video demonstrates tandem affinity purification — a technique to purify protein complexes from eukaryotic cells to study protein-protein interaction. The complex contains two proteins labeled with different epitope tags. Upon the purification of the complex using two resins with an affinity for the two different tags in a sequential manner, the presence of both proteins in the elute confirms the interaction between the two.
FAQs
Each format converts a protein association into a measurable signal using a different detection principle. Reporter-based systems produce an indirect signal, affinity capture retains one protein complex for detection, fluorescence tracks labeled components, and proximity-based methods respond when proteins are sufficiently close. Comparing these readouts helps investigators select an assay suited to detecting, measuring, or characterizing a particular interaction.
These factors can change the strength or behavior of cancer-related protein associations. Measuring interactions under altered conditions allows researchers to distinguish a stable association from one that depends on a mutation, a post-translational modification, or drug exposure. The resulting comparison can clarify how protein complexes respond to disease-associated changes or treatment and may reveal mechanisms of therapeutic resistance.
Changes in interaction strength provide evidence that a cellular relationship has been altered, even when the participating proteins remain the same. In cancer research, this comparison can help connect a protein complex with signaling regulation, tumor-promoting activity, or treatment resistance. The assay therefore contributes functional context to interaction maps rather than simply listing which proteins can associate.
Planning begins by selecting candidate proteins and defining the biological condition to compare, such as a mutation, modification state, or therapeutic compound exposure. Investigators then choose a format that brings the proteins into a defined system and select an appropriate readout, including reporter, affinity-capture, fluorescence, or proximity-based detection. The measured signals are interpreted as evidence of association or altered interaction.
The choice depends on the information sought and how the interaction can be observed in the defined assay system. Fluorescence can provide a signal linked to the participating proteins, affinity capture can detect complexes retained through binding, and proximity detection responds to close association. These options support complementary ways to characterize protein relationships and compare their behavior across conditions.
Cancer researchers use these assays to map signaling networks and examine protein associations linked to tumor growth or treatment resistance. Testing candidate interactions can also support validation of potential drug targets by showing whether a relevant complex changes under therapeutic conditions. When combined with mutation or modification comparisons, the results help connect molecular interactions with cancer-related pathway regulation.