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Related Concept Videos

Immunoprecipitation01:20

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- ChIP02:36

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...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

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.
Types of Coprecipitation01:10

Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...

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Related Experiment Video

Updated: Jun 3, 2026

Immunoprecipitation with an Anti-Epitope Tag Affinity Gel to Study Protein-Protein Interactions
07:16

Immunoprecipitation with an Anti-Epitope Tag Affinity Gel to Study Protein-Protein Interactions

Published on: January 5, 2024

Immunoprecipitation.

K Johansen1, L Svensson

  • 1Department of Virology, Swedish Institute for Infectious Diseases Control, Stockholm, Sweden.

Methods in Molecular Medicine
|March 11, 2011
PubMed
Summary
This summary is machine-generated.

Immunoprecipitation detects and quantifies proteins, aiding in antibody characterization. This sensitive method analyzes protein conformation and immune responses to pathogens.

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Immunoprecipitation is a key technique for detecting and quantifying antigens within complex protein mixtures.
  • It is also crucial for characterizing specific antibody responses against well-defined proteins.

Purpose of the Study:

  • To elucidate the methodology and applications of immunoprecipitation for protein analysis.
  • To highlight its sensitivity and advantages over other techniques like immunoblotting.

Main Methods:

  • Formation of antigen-antibody complexes using antibodies and typically radiolabeled proteins.
  • Separation of complexes from contaminants, followed by dissociation.
  • Analysis of target proteins using sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), autoradiography, or gel scanning.

Main Results:

  • Immunoprecipitation can detect minute amounts of radiolabeled proteins (~100 pg).
  • Sensitivity can be enhanced for unlabeled proteins using methods like enzymatic assays or Western blotting.
  • The technique preserves native protein conformation, allowing analysis of the immune response in its natural state.

Conclusions:

  • Radioimmunoprecipitation assay (RIPA) is a versatile tool for detecting viral proteins and characterizing antibody preparations.
  • It is essential for determining the specificity of immune responses to various pathogens.
  • Immunoprecipitation offers unique advantages for studying protein interactions and immune responses in their native form.