Immunoprecipitation of protein complexes, also known as co-immunoprecipitation (Co-IP), is a powerful technique to analyze protein-protein interactions. Commercial availability of Dynabeads® Protein A magnetic beads provides a fast, convenient, and efficient method for protein interaction studies by Co-IP followed by immunoblotting (Co-IP-blotting). Recently, the Co-IP-blotting technique helped us to investigate complicated protein interactions/networks involving nuclear protein 1 (Nupr1), a recently discovered regulator of apoptosis in human cartilage cells. The methods and protocols for Co-IP-blotting are reported here in detail.
Keywords: Electrophoresis; Immunoblotting; Immunoprecipitation; Magnetic bead; Nitrocellulose membrane; Pull-down.
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