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Immunoprecipitation

Immunoprecipitation

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
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...

Chromatin Immunoprecipitation- ChIP

Chromatin Immunoprecipitation- ChIP

Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...

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Related Experiment Video

Updated: May 23, 2026

Protein Extract Preparation and Co-immunoprecipitation from Caenorhabditis elegans

Protein Extract Preparation and Co-immunoprecipitation from Caenorhabditis elegans

Published on: May 23, 2020

Immunoprecipitation: preclearing the lysate.

Ed Harlow, David Lane

|April 10, 2012

Summary

This summary is machine-generated.

This study details a preclearing method using irrelevant antibodies to reduce background noise in immunoprecipitation assays. This technique improves the signal-to-noise ratio for more accurate results.

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Area of Science:

Biochemistry
Immunology
Molecular Biology

Background:

Immunoprecipitation (IP) is crucial for isolating specific proteins.
High background noise and low signal-to-noise ratio can compromise IP assay accuracy.
Nonspecific protein binding is a common challenge in IP experiments.

Purpose of the Study:

To introduce a preclearing protocol to enhance immunoprecipitation specificity.
To reduce background contaminants and improve the signal-to-noise ratio in IP assays.

Main Methods:

An irrelevant antibody, not recognizing the target antigen, is added to the lysate.
Rabbit serum provides a diverse antibody mixture for broad nonspecific binding.
Fixed Staphylococcus aureus Cowan I (SAC) is used as a source of Protein A to capture antibodies.
The precleared sample is then ready for the final immunoprecipitation step.

Main Results:

Nonspecific proteins are effectively removed by the irrelevant antibody during the preclearing step.
The signal-to-noise ratio is significantly improved, leading to cleaner IP results.
The protocol prepares samples for a more reliable final immunoprecipitation.

Conclusions:

The described preclearing method is an effective strategy to reduce background in immunoprecipitation.
This technique enhances the specificity and reliability of protein isolation via IP.
The protocol offers a practical approach to improve the quality of immunoprecipitation data.