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Significance The type VI secretion system involves multiple strategies for effector delivery via fusion or interaction of effectors to structural components of the phage tail-like structure, the tube component Hcp or spike protein VgrG. However, the detailed mechanisms underlying how diverse VgrG proteins govern effector delivery remains unclear. Here, we report that the divergent C-terminus of VgrG protein is the molecular determinant governing specific effector delivery and is required for interacting with a specific adaptor/chaperone protein that stabilizes and binds directly with the cognate effector. The striking conservation of genetic modules encoding homologous VgrG, a distinct set of potential adaptor/chaperone, and a specific effector in various Proteobacteria strongly suggest a conserved mechanism in type VI effector delivery.

VgrG C terminus confers the type VI effector transport specificity and is required for binding with PAAR and adaptor–effector complex