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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Tagging and Fusion Proteins01:24

Tagging and Fusion Proteins

Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
Immunofluorescence Microscopy01:12

Immunofluorescence Microscopy

A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.
The...
Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Related Experiment Video

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Fluorescent Labeling of COS-7 Expressing SNAP-tag Fusion Proteins for Live Cell Imaging
07:38

Fluorescent Labeling of COS-7 Expressing SNAP-tag Fusion Proteins for Live Cell Imaging

Published on: May 17, 2010

Imaging proteins inside cells with fluorescent tags.

Georgeta Crivat1, Justin W Taraska

  • 1University of Maryland, College Park, Department of Entomology and Program in Cell and Molecular Biology, College Park, MD 20742, USA.

Trends in Biotechnology
|September 20, 2011
PubMed
Summary
This summary is machine-generated.

This review covers four genetic methods for fluorescently labeling proteins in cells. It discusses new developments and practical tips for using these advanced protein imaging techniques.

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Area of Science:

  • Molecular Biology
  • Cellular Imaging
  • Biochemistry

Background:

  • Understanding protein function and regulation relies on observing biological molecules.
  • Genetically encoded fluorescent fusion tags are powerful tools for protein imaging.
  • Effective protein labeling is crucial for visualizing cellular processes.

Purpose of the Study:

  • To review advancements in genetic protein labeling techniques for cellular imaging.
  • To discuss practical considerations for implementing these methods in living cells.
  • To provide an overview of current strategies for fluorescent protein tagging.

Main Methods:

  • Autofluorescent proteins
  • Self-labeling enzyme systems
  • Enzyme-catalyzed probe attachment
  • Biarsenical dyes targeting tetracysteine motifs

Main Results:

  • Each of the four standard genetic labeling methods presents unique advantages and limitations.
  • Recent developments have expanded the capabilities and applications of these techniques.
  • Practical considerations for successful protein imaging in live cells are highlighted.

Conclusions:

  • Genetic protein labeling is essential for studying protein dynamics and function in vivo.
  • The choice of labeling method depends on specific experimental requirements and cellular context.
  • Continued innovation in protein tagging technologies enhances our ability to visualize cellular mechanisms.