High-throughput screening for protein-protein interactions using yeast two-hybrid arrays

Arrays are used for parallel assays of large numbers of proteins in a single experiment. They provide an alternative to libraries for protein screening purposes. This unit describes a protein array composed of living yeast (Saccharomyces cerevisiae) cells that can be used in a functional screen for protein interactions, the two-hybrid assay. The protocols described here use the yeast proteome as an example, but they can be applied to any other genome or subset thereof.