Binding Kinetics
Binding Kinetics - Related Videos
15:27
Determination of High-affinity Antibody-antigen Binding Kinetics Using Four Biosensor Platforms
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Cited by 30 •
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We describe here protocols for the measurement of antibody-antigen binding affinity and kinetics using four commonly used biosensor platforms.
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Protein-Drug Binding: Mechanism and Kinetics
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Protein-drug binding refers to the interaction between drugs and proteins within the body. This binding process can occur intracellularly, involving drug interactions with enzymes or receptors within cells, or extracellularly, involving plasma proteins in the blood. Various forces drive these interactions, including hydrogen bonds, hydrophobic interactions, ionic bonds, electrostatic interactions, and van der Waals forces. These bonds enable drugs to bind to specific sites on proteins,...
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Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell
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We describe a technique for concurrently measuring force-regulated single receptor-ligand binding kinetics and real-time imaging of calcium signaling in a single T lymphocyte.
08:07
Enzyme Assays and Kinetics
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Enzyme kinetics describes the catalytic effects of enzymes, which are biomolecules that facilitate chemical reactions necessary for living organisms. Enzymes act on molecules, referred to as substrates, to form products. Enzyme kinetic parameters are determined via assays that directly or indirectly measure changes in substrate or product concentration over time. This video will cover the basic principles of enzyme kinetics (including rate equations) and kinetic models. The concepts governing...
03:07
Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy
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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws. Collectively, the molecules in a sample of gas have average kinetic energy and average speed; but individually, they move at different speeds. Molecules frequently undergo elastic collisions in which the momentum is conserved. Since the colliding molecules are deflected off at different...
FAQs
Neither rate constant fully describes an interaction by itself. The association rate constant, kon, indicates how readily the complex forms, whereas koff indicates how readily it breaks down. Their combined behavior determines Kd, so interpreting both values reveals whether an observed binding relationship reflects rapid complex formation, prolonged persistence, or both.
Residence time describes how long a ligand remains associated with its target and is linked to the dissociation rate, koff. A slower dissociation corresponds to a longer-lasting complex, whereas a faster dissociation indicates shorter occupancy. This time-dependent information can help explain why interaction duration influences signaling, regulation, and responses to molecular inhibitors.
A binding-strength measurement summarizes the interaction at equilibrium, while Binding Kinetics adds information about the route to that state. Two interactions can therefore require comparison of their association and dissociation behavior, not only their overall equilibrium relationship. This dynamic perspective is especially useful when the duration of target engagement affects biological activity.
A high kon indicates that the ligand and target form a complex readily under the measured conditions. It describes the speed of complex formation, not the complete persistence of the interaction. To interpret its biological significance, researchers also consider koff and the resulting Kd, because rapid association alone does not specify how long the complex remains intact.
Researchers first examine complex formation to determine kon, then monitor complex breakdown to determine koff. These rate constants are interpreted together to obtain the equilibrium dissociation constant, Kd, and to assess residence time. Applying the workflow to the relevant molecular pair supports a dynamic characterization rather than relying only on a single binding-strength measurement.
This approach is useful when the timing of molecular engagement matters, such as when studying signaling or regulation. It can characterize interactions involving proteins, nucleic acids, receptors, antibodies, or drugs. By resolving formation and breakdown rates, the analysis helps connect molecular behavior with the duration and potential biological consequences of target engagement.
Measuring kon and koff allows researchers to compare inhibitors according to both complex formation and persistence. An inhibitor that remains associated for a different duration may produce a different biological effect even when binding-strength measurements appear similar. These kinetic comparisons therefore help explain inhibitor behavior and guide optimization of therapeutic candidates.
The approach applies across several biologically important interaction types, including protein-protein, protein-nucleic acid, receptor-ligand, antibody-target, and drug-target relationships. Measuring their association and dissociation behavior provides a common framework for examining molecular recognition, regulation, signaling, and pharmacological interactions while preserving information about interaction duration.