Abstract
Complex immunoprecipitation (Co-IP) is a powerful technique for precipitating an intact protein complex out of solution and cell lysates using an antibody that specifically binds to a particular protein in a large complex of proteins. Mass spectrometry (MS) is used to identify, sequence, and quantify proteins. RNA-induced silencing complexes (RISCs), Ago2 centered protein assemblies, are essential for miRNA mediated RNA decay and gene expression regulation; however, the complete list of RISCs is unknown. Here we describe methods used to combine IP and MS to identify new components of RISCs.
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