Co-immunoprecipitation and protein blots.

Knowledge about the identity of the interacting partners is important for the understanding of the function and the cellular activity of a given protein. Here we describe co-immunoprecipitation and pull-down as methods that are widely used for the identification and characterization of protein-protein interactions. These methods are well suited to find or confirm the interaction among multiple proteins, given the availability of a specific antibody for or a tagged version of the protein of interest.