Laimburg Research Centre 1 article published in JoVE Immunology and Infection Unravelling the Function of a Bacterial Effector from a Non-cultivable Plant Pathogen Using a Yeast Two-hybrid Screen Katrin Janik1, Katja Schlink1 1Department of Molecular Biology - Functional Genomics, Laimburg Research Centre Bacterial effector proteins are important for establishing successful infections. This protocol describes the experimental identification of proteinaceous binding partners of a bacterial effector protein in its natural plant host. Identifying these effector interactions via yeast two-hybrid screens has become an important tool in unravelling molecular pathogenicity strategies.