Affinity Purification of Protein Complexes Using TAP Tags
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Updated: Apr 9, 2026

Purification of Native Complexes for Structural Study Using a Tandem Affinity Tag Method
Published on: July 27, 2016
1Department of Cell Biology, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, USA.
Abstract:
This protocol is used for the isolation and analysis of protein complexes using the tandem affinity purification (TAP) tag system. The protocol describes the purification of a protein fused to a TAP tag comprised of two protein A domains and the calmodulin binding peptide separated by a TEV cleavage site. This is a powerful technique for rapid purification of protein complexes and the analysis of their stoichiometric composition, posttranslational modifications, structure, and functional activities.
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