Fluorescent Substrate
Fluorescent Substrate - Related Videos
08:37
Fluorescence-based Monitoring of PAD4 Activity via a Pro-fluorescence Substrate Analog
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Cited by 3 •
2014
PAD4 is an enzyme responsible for the conversion of peptidyl-arginine to peptidyl-citrulline. Dysregulation of PAD4 has been implicated in a number of human diseases. A facile and high-throughput compatible fluorescence based PAD4 assay is described.
03:05
Fluorescent Peptide Zymography: A Modified Technique to Detect Protease Activity Using Fluorogenic Substrates in Zymogram Gels
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2025
In this video, we perform zymography, an electrophoretic technique, to analyze the proteolytic activity within biological samples.
11:13
Identification of Kinase-substrate Pairs Using High Throughput Screening
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Cited by 1 •
2015
Protein phosphorylation is a central feature of how cells interpret and respond to information in their extracellular milieu. Here, we present a high throughput screening protocol using kinases purified from mammalian cells to rapidly identify kinases that phosphorylate a substrate(s) of interest.
07:02
Stiffness Measurement of Soft Silicone Substrates for Mechanobiology Studies Using a Widefield Fluorescence Microscope
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Cited by 19 •
2018
Substrates with stiffness in the kilopascal-range are useful to study the response of cells to physiologically relevant micro-environment stiffness. Using just a widefield fluorescence microscope, the Young's modulus of soft silicone gels can be determined using an indentation with a suitable sphere.
08:36
Creating Two-Dimensional Patterned Substrates for Protein and Cell Confinement
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Cited by 5 •
2011
Self-assembled monolayers (SAMs) formed from long chain alkane thiols on gold provide well-defined substrates for the formation of protein patterns and cell confinement. Microcontact printing of hexadecanethiol using a polydimethylsiloxane (PDMS) stamp followed by backfilling with a glycol-terminated alkane thiol monomer produces a pattern where protein and cells adsorb only to the stamped hexadecanethiol region.
FAQs
The key signal-generating event is conversion of a weakly fluorescent substrate into a fluorescent product. A target enzyme may cleave the compound or chemically modify it, changing the product’s ability to emit light after excitation. Because signal formation depends on that reaction, measured fluorescence can serve as an indirect readout of enzyme activity or a related biological event.
Excitation and emission are separate parts of fluorescence detection. The reaction product emits light at defined wavelengths after absorbing excitation energy, so measurements must distinguish the incoming excitation from the emitted signal. This wavelength-dependent behavior allows instruments to detect the reaction product selectively and convert its fluorescence into a measurable assay readout.
Substrate specificity determines how closely the signal reflects the intended target enzyme rather than other reactions. Background fluorescence can raise the measured signal even when target activity is limited, while assay conditions can alter the reaction or detection process. These factors affect signal clarity and therefore influence how confidently fluorescence intensity represents biological activity.
Enzyme specificity helps connect fluorescence to a particular host or microbial process. If the substrate is modified by unintended enzymes, the resulting signal may reflect several activities rather than the target event. Selecting a chemically responsive compound with appropriate specificity can therefore improve interpretation of pathogen detection or measurements of enzyme activity during infection-related studies.
In an enzyme-linked immunoassay, the substrate is included after the assay has linked the relevant enzyme activity to the biological target being examined. Enzymatic cleavage or chemical modification then generates the fluorescent product, and fluorescence is measured as the assay readout. The signal connects enzyme activity with detection of the targeted immunological event.
Fluorescence intensity provides a measurable signal associated with the amount of fluorescent product generated during the assay. When substrate conversion reflects target enzyme activity, differences in intensity can indicate differences in that activity or in the biological event being monitored. Interpretation still requires attention to substrate specificity, background signal, and assay conditions.
These substrates support several research applications, including enzyme-linked immunoassays, reporter systems, pathogen detection, and measurements of host or microbial enzyme activity. Their value comes from translating enzyme-dependent reactions into detectable fluorescence, allowing investigators to monitor biological events through a sensitive signal. The same principle can therefore connect immune responses, microbial processes, and diagnostic-style detection assays.