Tandem affinity purification is a robust approach for the identification of protein binding partners. As proof of concept, this methodology was applied to the well-characterized translation initiation factor eIF4E to co-precipitate the host cell factors involved in translation initiation. This method is easily adapted to any cellular or viral protein.
Bailey, D., Urena, L., Thorne, L., Goodfellow, I. Identification of Protein Interacting Partners Using Tandem Affinity Purification. J. Vis. Exp. (60), e3643, doi:10.3791/3643 (2012).