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Related Concept Videos

Western Blotting01:15

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Western blotting is an analytical technique for protein identification. It has various applications in immunology and medicine, including detecting diseases like bovine spongiform encephalopathy, mad cow disease, and human and feline immunodeficiency virus from biological samples.
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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
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Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
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Immunocytochemistry (ICC) and immunohistochemistry (IHC) are techniques that use antibodies to check for specific proteins or antigens in a sample. The technique was first published by Albert Coons in 1941 to detect the presence of pneumococcal antigen in tissue sections from mice infected with Pneumococcus. Immunocytochemistry helps localization of proteins or antigens in individual cells like blood cells, stem cells, etc., while immunohistochemistry does the same for tissue samples.
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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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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.
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Immunoblot Analysis
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Immunoblot Analysis

Published on: June 20, 2008

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Immunoblotting and Immunodetection.

Duojiao Ni1, Peng Xu2, Sean Gallagher1

  • 1Analytik Jena, Upland, California.

Current Protocols in Cell Biology
|March 4, 2017
PubMed
Summary
This summary is machine-generated.

Western blotting is a key technique for identifying specific antigens using antibodies. This protocol details sample preparation, protein separation, membrane transfer, and immunodetection for accurate antigen identification.

Keywords:
alkaline phosphataseantibodieshorseradish peroxidaseimmunoblotwestern blot

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunology

Background:

  • Immunoblotting, commonly known as western blotting, is a widely used technique in molecular biology.
  • It enables the detection and identification of specific proteins (antigens) within a complex mixture.
  • The technique relies on the specific binding of antibodies to target antigens.

Purpose of the Study:

  • To provide comprehensive protocols for performing immunoblotting (western blotting).
  • To detail each step from protein sample preparation to final detection.
  • To ensure reproducibility and accuracy in identifying specific antigens.

Main Methods:

  • Protein sample solubilization using SDS and reducing agents.
  • Separation of proteins by SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis).
  • Electrophoretic transfer of separated proteins to a membrane, monitored by Ponceau S staining.
  • Immunodetection using primary and secondary antibodies, followed by signal detection via fluorescent, chromogenic, or luminescent substrates.

Main Results:

  • Successful identification of specific antigens through antibody recognition.
  • Demonstration of efficient protein transfer and binding to membranes.
  • Validation of immunodetection methods using various labeling and detection strategies.

Conclusions:

  • Immunoblotting is a robust method for antigen detection.
  • The provided protocols cover all essential steps for successful western blotting.
  • The technique allows for sensitive and specific identification of target proteins.