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Immunoblotting and immunodetection.

Sean Gallagher¹, Scott E Winston², Steven A Fuller²

¹Hoefer Scientific, San Francisco, California.

Current Protocols in Immunology

|April 25, 2008

Summary

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Western blotting identifies specific antigens using antibodies. This unit details protein transfer to membranes, blocking, antibody probing, and enzyme-linked detection for visualization, including stripping and reprobing methods.

Area of Science:

Biochemistry
Molecular Biology
Immunology

Background:

Immunoblotting, commonly known as western blotting, is a crucial technique for detecting specific antigens.
It relies on the specific binding of antibodies (polyclonal or monoclonal) to target antigens.

Purpose of the Study:

To provide detailed procedures for western blotting.
To cover antigen transfer, membrane blocking, antibody probing, and signal detection.

Main Methods:

Electrophoretic transfer of antigens from polyacrylamide gels to nitrocellulose, PVDF, or nylon membranes.
Monitoring transfer using reversible staining or Ponceau S staining.
Blocking non-specific binding sites with protein or detergent solutions.
Immunodetection using primary and secondary antibodies conjugated to enzymes (horseradish peroxidase or alkaline phosphatase) via direct or avidin-biotin methods.

Related Experiment Videos

Visualization of antibody-antigen complexes using chromogenic or luminescent substrates.

Methods for stripping and reprobing membranes are also presented.

Main Results:

Successful transfer and immobilization of antigens onto various membrane types.
Effective blocking of non-specific binding sites.
Specific detection of antibody-antigen complexes through enzymatic activity.
Visualization of results using appropriate substrates.
Demonstration of membrane stripping and reprobing for multiple analyses.

Conclusions:

The presented protocols offer a comprehensive guide to performing western blotting.
These methods facilitate reliable identification and visualization of specific antigens.
The ability to strip and re-probe membranes enhances experimental efficiency and reduces reagent consumption.