Abstract
INTRODUCTIONOne approach to identifying protein–protein interactions is the biochemical purification of a target protein from cells or tissues under nondenaturing conditions, followed by the mass spectrometric identification of the components of the purified protein complex. The combination of highly specific protein purification strategies and mass spectrometry has proven to be a very successful approach for identifying protein–protein interactions. The tandem affinity purification (TAP) affinity tag and purification method allows efficient recovery of proteins present at low cellular concentrations under native conditions. Expressing the target protein at its natural levels avoids the assembly of overexpressed proteins into nonphysiological complexes. This protocol describes calmodulin affinity capture of the TAP-tagged complexes after immunoglobulin G (IgG) affinity purification has been performed. These complexes can then be analyzed by methods such as high-sensitivity liquid chromatography coupled with tandem mass spectrometry and/or multidimensional protein identification technology (MudPIT) analysis.
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