Fluorescent Protein Labeling
Fluorescent Protein Labeling - Related Videos
06:48
Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads
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Cited by 3 •
2016
The on-bead method for labeling antibodies with small molecules enables labeling of a small amount of antibodies directly from cell media. This method is compatible with amine and thiol chemistry, and can handle multiple samples in parallel, manually or using automated platforms.
11:55
Examining the Conformational Dynamics of Membrane Proteins in situ with Site-directed Fluorescence Labeling
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Cited by 11 •
2011
We will describe a method which measures the kinetics of ion transport of membrane proteins alongside site-specific analysis of conformational changes using fluorescence on single cells. This technique is adaptable to ion channels, transporters and ion pumps and can be utilized to determine distance constraints between protein subunits.
09:38
Fluorescence Labeling to Visualize Low-Expressed Proteins in Zebrafish
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2025
Here, we present a protocol to label proteins with a fluorescence protein tag in zebrafish larvae, a newly developed and modified in vivo system especially useful for visualizing low-abundance proteins in zebrafish.
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.
07:38
Fluorescent Labeling of COS-7 Expressing SNAP-tag Fusion Proteins for Live Cell Imaging
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Cited by 8 •
2010
SNAP-tag and CLIP-tag protein labeling systems enable the specific, covalent attachment of molecules, including fluorescent dyes, to a protein of interest in live cells. Once cloned and expressed, the tagged protein can be used with a variety of substrates for numerous downstream applications without having to clone again.
FAQs
After the fused gene is expressed, the fluorescent-protein portion forms its chromophore within the protein itself. That chromophore provides the light-responsive component of the label: excitation at a defined wavelength causes the fusion protein to emit light. This sequence links molecular expression to a visible signal in the specimen.
Gene fusion is central because it connects the fluorescent protein sequence to the gene encoding the protein of interest. Expression therefore produces a single fusion protein rather than an unattached label. The fluorescent signal can then be interpreted in relation to the target protein’s location and behavior, which is especially useful when those properties change in living specimens.
Defined excitation wavelengths provide the trigger for observation: when the specimen is illuminated under the appropriate condition, the fluorescent protein emits light. Researchers can therefore use a specified excitation setting to visualize the labeled fusion protein in a living specimen. The emitted signal makes the target’s location or behavior accessible through optical observation.
In neurons, the resulting signal can be used to examine overall morphology as well as the organization of axons and dendrites. These structural readouts help researchers relate a labeled protein or cell to the shape and arrangement of neuronal processes. The approach therefore supports investigation of how neuronal architecture is organized in living specimens.
At synapses, the location of the fluorescent signal can show where a labeled protein is positioned within neuronal connections. Following changes in that signal can also support analysis of protein trafficking, meaning movement of the labeled protein through the cell. These observations connect molecular positioning with synaptic organization and cellular function.
Because the label is genetically encoded, researchers can examine labeled structures in living specimens. In neuroscience, this makes the approach relevant to circuit development and cellular function, while also supporting observations of neuronal morphology, process organization, and protein behavior within the same living context. The method thus links molecular signals with broader neural processes.