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Emulsion technology has been successfully applied to the fields of next-generation high-throughput sequencing, protein engineering and clinical diagnostics. Here, we extend its scope to proteomics research by developing and characterizing a method, termed iCLIP (in vitro compartmentalized linkage of interacting partners), which enables genes encoding interacting protein pairs to be linked in a single segment of DNA. This will facilitate archiving of the interactomes from library versus library two-hybrid screens as libraries of linked DNAs. We further demonstrate the ability to interrogate a model yeast two-hybrid iCLIP library for interactants by "PCR-pulldown," using a primer specific to a gene of interest along with a universal primer. iCLIP libraries may also be subjected to high-throughput sequencing to generate interactome information. The applicability of the technique is also demonstrated in the related context of the bacterial two-hybrid system. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.