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. 2010 Aug 12;53(1):13–19. doi: 10.1016/j.ymeth.2010.08.007

Fig. 2.

Fig. 2

The double pull-down approach to characterize HIV–human protein complexes. In this strategy, cell lines are expressing two proteins, one viral and one host, each with a different affinity tag. The first purification step enriches for the viral protein, and presumably all the complexes it is associated with whereas the second purification step targets a host protein and enriches for a specific and stoichiometric viral-host protein complex.