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Agrobacterium tumefaciens causes crown gall disease§on plants and is the primary vector in genetic§engineering of plants. Agrobacterium transports DNA§and proteins to the plant cell via a Type IV§Secretion System. This system is similar to secretion§systems in human pathogens and those used for DNA§exchange during bacterial conjugation. To better§understand this process, a genetic screen using yeast§as the genetically engineered host was developed to§identify host proteins involved in transformation.§While developing this screen, factors that alter§transformation of yeast were identified. The yeast§two-hybrid (Y2H) assay was used to identify protein§interactions between the exported proteins and the§secretion system. Additional studies indicate the§secreted proteins are targeted to the secretion§system via a conserved transport sequence. The Y2H§system was also used to assay for interactions§between proteins of the secretion system. Together,§these studies provide insights into transporter§complex protein subassemblies, the process of protein§export during Agrobacterium transformation, and§contribute to understanding homologous systems in§human pathogens and bacterial conjugation.