A visual chip-based coimmunoprecipitation technique for analysis of protein-protein interactions.

Here we report a visual chip-based coimmunoprecipitation (vChip-coIP) platform for analysis of protein-protein interactions (PPIs) by combining advantages of an antibody microarray, traditional coIP, and a silver enhancement detection method. The chip was fabricated by spotting anti-Flag antibody on aldehyde-modified slides, and the resulting platform could assay immunoprecipitate from a small amount of crude cell lysates containing Flag-bait and Myc-prey. The interaction signals are visible using biotinylated anti-Myc antibody and colloidal gold-labeled streptavidin followed by a silver enhancement detection method. It is shown that vChip-coIP is a simple, cost-effective, and highly efficient platform for the comprehensive study of PPIs. 2010 Elsevier Inc. All rights reserved.