Fluorescent Protein Screening
Fluorescent Protein Screening - Related Videos
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
10:24
A Fluorescence-based Protocol for Preliminary Screening of Protein Synthesis Inhibitors from Natural Sources
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2026
This protocol introduces a fluorometric screening methodology optimized for identifying natural product/small molecule inhibitors of protein synthesis. Its practicality makes it suitable for both undergraduate instruction in drug discovery techniques and implementation in medicinal chemistry campaigns.
03:15
Screening of Cyclic di-GMP Modulators Using Bacteria Expressing a Fluorescent Reporter Protein
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2025
Source: Rugjee, K. N., et al. Establishment of a High-throughput Setup for Screening Small Molecules That Modulate c-di-GMP Signaling in Pseudomonas aeruginosa. J. Vis. Exp. (2016).This video demonstrates the screening of cyclic di-GMP modulators using genetically modified bacteria that express green fluorescent protein (GFP) under the control of a c-di-GMP-sensitive promoter. Fluorescence is measured in a multi-well plate containing different test compounds. Compounds that inhibit c-di-GMP...
14:53
High-throughput Screening and Biosensing with Fluorescent C. elegans Strains
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Cited by 63 •
2011
A procedure for liquid-based culturing and dispensing of C. elegans strains expressing fluorescent reporter proteins is described that does not require expensive sorting equipment. This approach can be applied to numerous inducible C. elegans genes for drug discovery or biosensing of contaminants.
06:26
Rapid Assessment of Membrane Protein Quality by Fluorescent Size Exclusion Chromatography
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Cited by 2 •
2023
The present protocol describes a procedure to perform fluorescent size exclusion chromatography (FSEC) on membrane proteins to assess their quality for downstream functional and structural analysis. Representative FSEC results collected for several G-protein coupled receptors (GPCRs) under detergent-solubilized and detergent-free conditions are presented.
FAQs
Excitation wavelength provides the input used to evaluate how a candidate fluorescent protein emits light. By comparing emitted fluorescence among expressed variants, researchers can assess properties such as intensity, color, brightness, and stability. This optical readout links a protein sequence variant to an observable phenotype, allowing selection based on the property most relevant to the intended biochemical experiment.
Selection can incorporate functional activity as well as optical behavior. A variant may therefore be evaluated not only for emitted light, but also for whether its activity supports the intended reporter or biosensor use. Considering both dimensions helps connect fluorescence measurements with the biological function the engineered protein must perform in a biochemical system.
Expression of candidate genes within cells or other biological systems lets fluorescent proteins function as genetically encoded reporters, biosensors, or labels. Their fluorescence can then support observation of molecular interactions, protein localization, and biochemical changes in the biological context where they are expressed. This connection makes the method useful for live-cell imaging and quantitative studies of biological mechanisms.
A typical workflow begins with candidate genes, followed by expression in cells or another biological system. The expressed variants are exposed to an excitation wavelength, and their emitted light is evaluated. Researchers can then compare fluorescence intensity, color, brightness, stability, or activity and select variants matching the desired optical or functional outcome.
Useful variants are identified by matching screening measurements to the purpose of the experiment. If brightness or intensity is the priority, emitted-light measurements guide comparison; color, stability, or activity may instead be the relevant criterion. This interpretation supports selection of variants suited to a specific protein-engineering goal rather than applying one criterion to every screening result.
Fluorescent protein screening is relevant to biochemistry because selected variants can be incorporated into tools that reveal molecular behavior. Reporters, biosensors, and labels support tracking of interactions, localization, and biochemical changes, while live-cell imaging provides access to processes in living systems. These outputs enable quantitative studies of protein behavior and biological mechanisms.