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Updated: Jul 5, 2026

Immunoprecipitation with an Anti-Epitope Tag Affinity Gel to Study Protein-Protein Interactions
Published on: January 5, 2024
Immunoprecipitation
Juan S Bonifacino1, Esteban C Dell'Angelica, Timothy A Springer
1National Institute of Child Health and Human Development, Bethesda, Maryland, USA.
Abstract:
Immunoprecipitation is a technique in which an antigen is isolated by binding to a specific antibody attached to a sedimentable matrix. It is also used to analyze protein fractions separated by other biochemical techniques such as gel filtration or density gradient sedimentation. The source of antigen for immunoprecipitation can be unlabeled cells or tissues, metabolically or intrinsically labeled cells, or in vitro-translated proteins. This unit describes a wide range of immunoprecipitation techniques, using either suspension or adherent cells lysed by various means (e.g., with and without detergent, using glass beads, etc.). Flow charts and figures give the user a clear-cut explanation of the options for employing the technology.
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