Low Affinity Interactions
Low Affinity Interactions - Related Videos
10:02
Identification of Protein Interacting Partners Using Tandem Affinity Purification
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Cited by 20 •
2012
Tandem affinity purification is a robust approach for the identification of protein binding partners. As proof of concept, this methodology was applied to the well-characterized translation initiation factor eIF4E to co-precipitate the host cell factors involved in translation initiation. This method is easily adapted to any cellular or viral protein.
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.
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.
01:41
Affinity and Avidity
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2019
Overview Antibodies bind to toxins or substances on the surface of cells, bacteria, viruses, or fungi. The substance is called an antigen, and the precise binding site is the epitope. The strength of the antibody-epitope interaction is called affinity. When an antibody binds an antigen by multiple epitopes, the cumulative strength of the interaction is called avidity. The strength of the interaction influences the elicited immune response. The Adaptive Immune System Increases Efficiency by...
12:30
Avidity-based Extracellular Interaction Screening (AVEXIS) for the Scalable Detection of Low-affinity Extracellular Receptor-Ligand Interactions
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Cited by 56 •
2012
AVEXIS is a high throughput protein interaction assay developed to systematically screen for novel extracellular receptor-ligand pairs involved in cellular recognition processes. It is specifically designed to detect transient protein interactions that are difficult to identify using other high throughput approaches.
FAQs
A single contact contributes only limited binding energy, but several contacts can act together across interacting biomolecules. Hydrogen bonds, electrostatic attraction, hydrophobic effects, and van der Waals contacts collectively improve recognition and association while preserving reversibility. This combination allows assemblies to form selectively without requiring a permanent bond between every participating molecule.
Because these associations readily dissociate, changes in molecular concentration or surrounding conditions can shift the balance between assembled and unassembled states. Higher concentrations can favor transient complex formation, whereas altered conditions may weaken contacts and promote dissociation. This sensitivity helps biomolecular systems respond dynamically rather than remain locked in one configuration.
Low affinity interactions support temporary recognition and can separate without breaking a covalent structure. Their reversibility distinguishes them from permanent bonding, allowing molecules to associate, dissociate, and reassociate as conditions change. In biochemistry, this behavior is important when a system must coordinate selective binding or assembly while retaining the ability to remodel its molecular organization.
Several noncovalent forces can contribute simultaneously. Hydrogen bonding and electrostatic attraction help provide recognition between compatible molecular surfaces, while hydrophobic effects and van der Waals contacts add further stabilizing contributions. No single contact must account for the entire association; their combined effects determine whether a transient complex forms and how readily it dissociates.
Experimental interpretation should consider that observed associations may change when molecular concentrations or other conditions change. A transient complex may therefore reflect a shifting equilibrium rather than a permanent assembly. Accounting for this behavior helps researchers design and interpret experiments involving biomolecular recognition, dynamic protein networks, selective transport, and other systems that depend on controlled binding.
They contribute to dynamic protein networks, enzyme regulation, membrane organization, and biomolecular condensates. Their combined contacts can guide molecular assembly, while their reversibility permits these systems to reorganize. They also matter in selective transport and therapeutic design, where controlled, temporary binding can be more useful than an interaction that permanently fixes molecular partners together.