GST Pull-Down Assay to Measure Complex Formations

Abstract

The GST pull-down assay is an intuitive and fast in vitro method for analyzing protein–protein or protein–ligand interactions and is comprised of a “bait” which is a GST-fused protein expressed in E. coli host or a baculovirus expression system and a “prey” which comprises putative binding partner protein(s) or other ligand molecule(s). This method is suitable for examining the direct interaction between two purified proteins and estimating the extent of the affinity.