Luminometer Assay
Luminometer Assay - Related Videos
08:32
The ATP Bioluminescence Assay
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2023
In fireflies, the luciferase enzyme converts a compound called luciferin into oxyluciferin, and produces light or “luminescence” as a result. This reaction requires energy derived from ATP in order to proceed, so researchers have exploited the luciferase-luciferin interaction to gauge ATP levels in cells. Given ATP’s role as the cell’s currency of energy, the ATP bioluminescence assay can provide insight into cellular metabolism and overall cell health.In this video, JoVE discusses cellular...
02:36
The Luciferase Assay: A High-Throughput Assay to Measure Luminescent Signals Using Engineered Nanoluciferase System-Based Bioreporters
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2025
The video demonstrates the luciferase assay used to quantify luciferase-tagged proteins. The assay uses an engineered luciferase enzyme composed of a large fragment that binds with the small fragment, which is conjugated with a protein of interest. The bound subunits form an active enzyme that, in the presence of the substrate, releases a luminescent signal. This signal is then quantified using a luminometer.
07:18
Intracellular Refolding Assay
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Cited by 9 •
2012
In this protocol a method to measure intracellular protein refolding after heat shock is described. This method can be used to study foldases like molecular chaperones and their co-factors or compounds able to influence their activity. Firefly luciferase activity is used as reporter to measure chaperone refolding activity.
02:01
Assessing Pseudovirus Infection Using Luciferase Reporter 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 assay to quantify pseudovirus infection in epithelial cells. The pseudovirus encodes the luciferase gene, which is expressed in infected cells. After washing, and cells are incubated with lysis buffer at an ultra-low temperature, and then thawed to induce lysis.
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.
FAQs
The assay interprets photon output as a measurable signal from an ongoing chemical, enzymatic, or biological reaction. When the emitted light correlates with the amount or activity of a target, signal intensity can serve as a quantitative readout. Controlled conditions are important because they help make differences in light production reflect biological differences rather than inconsistent assay conditions.
Luciferase-driven bioluminescence provides one biological source of measurable light, while chemiluminescent reactions provide another through chemical processes. The luminometer detects the photons generated by either reaction and converts their intensity into data. This flexibility allows the same measurement approach to support different experimental goals, including reporter-gene analysis, enzyme activity measurements, and detection of biological interactions.
Light detection offers a sensitive readout of reaction activity, allowing researchers to quantify changes in molecular or cellular processes. Because the signal can correlate with target amount or activity, comparisons between measurements can reveal increases or decreases in biological function. This sensitivity supports applications such as monitoring gene expression, evaluating cell viability, and screening potential treatments.
Reaction conditions should remain controlled so that differences in photon output can be interpreted consistently. The measured signal reflects the activity of the chemical, enzymatic, or biological reaction under those conditions, rather than serving as an isolated observation of light. Consistent control therefore strengthens quantitative comparisons across samples and improves interpretation of molecular or cellular activity.
A basic workflow begins with a reaction designed to produce light, followed by measurement of the emitted photons with a luminometer. The resulting signal intensity is then related to the biological target or activity being studied. Depending on the experimental design, this readout can support quantitative assessment of gene expression, cell viability, enzyme activity, or biological interactions.
Researchers may select this approach when they need rapid, quantitative information about molecular or cellular activity. It is relevant to reporter-gene studies, drug screening, diagnostics, gene-expression monitoring, cell-viability assessment, enzyme analysis, and detection of biological interactions. In each case, the light signal provides an experimental outcome that can be compared under controlled conditions.