Bacterial Binding Assay
Bacterial Binding Assay - Related Videos
09:17
Quantification of Bacterial Histidine Kinase Autophosphorylation Using a Nitrocellulose Binding Assay
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Cited by 3 •
2017
We report and demonstrate an optimized nitrocellulose binding assay that can be used to quantify autophosphorylation of purified bacterial histidine kinases. Our method has several advantages over traditional SDS-PAGE based techniques, providing a valuable alternative for characterizing these important proteins.
03:05
Detection of Vitronectin Binding to Bacterial Surfaces using Flow Cytometry
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2025
This video demonstrates the detection of vitronectin's interaction with bacterial surface proteins. The flow-cytometry analysis measures the fluorescence signal of fluorescently labeled antibodies bound to vitronectin, confirming its presence at the bacterial surface. This technique provides insights into host-pathogen interactions and potential bacterial infection therapies.
04:38
Differential Radial Capillary Action of Ligand Assay: A High-Throughput Technique to Identify Bacterial Nucleotide Second Messenger-Binding Intracellular Proteins
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2025
This video demonstrates the differential radial capillary action of ligand assay — a technique for systematic high-throughput screening of intracellular nucleotide second messenger-binding proteins. This technique allows for direct binding of the messengers to the overexpressed target protein in the cell lysate — bypassing the need for protein purification.
04:24
An Assay to Quantify the Binding of Human Norovirus VLPs to Intestinal Bacteria
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2025
This video demonstrates an assay for quantifying human norovirus virus-like particles (VLPs) binding to human intestinal bacteria. The bacterial suspensions are mixed with the VLPs and incubated to allow the formation of VLP-bacteria complexes. The complexes are then labeled with fluorophore-tagged VLP-specific antibodies, followed by flow cytometry-based visualization and quantification to identify the percentage of VLP-bound bacteria.
04:05
Competition Binding Assay to Study Competing GTPase-Binding Protein Partners
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2025
This video demonstrates a competition assay to study GTPase-binding protein partners. Utilizing nucleotide-bound GTPase protein immobilized on magnetic beads, the competitive binding between two interacting protein partners for the same binding site on the GTPase can be studied to assess the binding affinities of the protein partners.
FAQs
The measured result reflects interactions between bacterial adhesion factors and features of the target, including host-cell receptors, purified proteins, surfaces, or biomaterials. Controlled incubation conditions help make these interactions comparable, while surface properties can influence how many cells remain attached. Consequently, the assay can connect bacterial attachment with receptor–ligand interactions or material characteristics.
Washing separates bacteria that have remained attached from cells that did not bind or were only loosely associated. The retained population therefore provides the basis for estimating attachment under the selected assay conditions. If washing is not applied consistently, differences in unbound-cell removal could alter the measured signal and complicate comparisons between targets or bacterial samples.
Using host-cell receptors, purified proteins, surfaces, or biomaterials focuses the assay on different interaction contexts. A receptor or purified protein can help examine specific receptor–ligand relationships, whereas a surface or biomaterial can reveal how physical or chemical surface properties relate to attachment. This flexibility links molecular binding studies with broader investigations of colonization and infection.
A typical workflow brings bacteria into contact with a selected target under controlled conditions, allows attachment during incubation, removes unbound cells by washing, and measures the bacteria that remain. The final measurement may use labeling, microscopy, or growth-based quantification. Keeping the incubation and washing stages consistent is essential for interpreting retained-cell measurements.
Three approaches described for these assays are labeling, microscopy, and growth-based measurements. Labeling supplies a measurable signal associated with retained bacteria, microscopy allows attached cells to be examined directly, and growth-based measurements estimate the retained population through subsequent bacterial growth. The selected readout determines how attachment is represented and compared across experimental targets.
These assays support studies of microbial pathogenesis and host–microbe interactions by examining bacterial attachment related to colonization and infection. They also help evaluate antimicrobial strategies and investigate materials designed either to limit or promote bacterial attachment. In this way, the measurements connect bacterial surface behavior with disease-related mechanisms and biomaterial performance.