Pseudovirus Binding
Pseudovirus Binding - Related Videos
02:22
Production of Pseudovirus Using Plasmid Transfection in Human Cells
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2026
Source: Chang, X., et al. Preparation of Pseudo-Typed H5 Avian Influenza Viruses with Calcium Phosphate Transfection Method and Measurement of Antibody Neutralizing Activity. J. Vis. Exp. (2021)This video demonstrates the production of influenza pseudoviruses in human cells using calcium phosphate-mediated plasmid transfection, enabling safe generation of single-cycle viral particles for downstream applications such as antibody neutralization assays under biosafety level 2 conditions.
03:09
Determining Optimal Target Cell Density Using a Luciferase-Based Pseudovirus Infection Assay
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2026
Source: Chang, X., et al. Preparation of Pseudo-Typed H5 Avian Influenza Viruses with Calcium Phosphate Transfection Method and Measurement of Antibody Neutralizing Activity. J. Vis. Exp. (2021)This video demonstrates a luciferase-based pseudovirus titration assay to determine the optimal target cell density for maximum infection. By comparing luminescence across cell densities, the method ensures high assay sensitivity and reproducibility for downstream applications.
02:18
The Equilibrium Binding Constant and Binding Strength
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2020
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium: where P and L are the unbound protein and ligand, respectively, and PL is the protein-ligand complex. As the amount of bound ligand is also related to the rate of ligand binding, experiments can also determine Kb by examining the rates of protein-ligand association (kon) and dissociation (koff) using the following ratio: Thus,...
02:40
Ligand Binding Sites
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2020
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands. Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
01:49
Conserved Binding Sites
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2020
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function. Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
FAQs
The decisive interaction is recognition between a selected viral surface protein and a compatible molecule on the target cell. This compatibility determines whether particles attach under the experimental conditions, allowing investigators to examine receptor usage and compare how different cell types support the earliest stages of virus–cell interaction.
Differences in attachment among target cells can indicate which cells express molecules recognized by the displayed viral protein. Because cellular tropism concerns the cells associated with viral interaction, binding measurements help map receptor preferences and identify cell-specific patterns before researchers examine later stages of infection.
Binding depends on the interaction between the displayed surface protein and its compatible host-cell receptor, so measurements must be interpreted within the conditions used for the experiment. Keeping those conditions defined supports meaningful comparisons of attachment, receptor usage, and factors that may alter early virus–cell interactions.
Researchers select engineered particles displaying the viral surface protein of interest and expose them to target cells under defined conditions. Fluorescent or otherwise tagged particles provide a way to detect attachment, after which the amount of bound material can be quantified. This workflow supports direct comparisons across cell types or experimental conditions.
Variant comparisons are useful when investigators want to determine whether changes in selected viral surface proteins alter attachment to target-cell receptors. Measuring binding across variants can reveal differences in receptor usage or cellular tropism while avoiding propagation of a fully infectious virus, supporting studies of early entry-related interactions.
Pseudovirus binding assays can be applied to evaluate neutralizing antibodies, entry inhibitors, and vaccine responses by examining whether these factors influence particle attachment to target cells. Fluorescent or tagged particles make the interaction quantifiable, enabling comparisons of how experimental treatments affect receptor engagement and the early stages of virus–cell contact.