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Schematic representation of the F-like oriT and deletion variants. DNA sequences important to TraI binding and strand cleavage include nic (black triangle) and the inverted repeat (arrows). The binding sites for the accessory proteins IHF (ihfA and ihfB), TraY (sbyA), and TraM (sbmA, sbmB, and sbmC) are illustrated. The Δnic deletions in R1-16 and pOX38 remove TraI relaxase binding sites. The ΔoriT derivatives lack binding sites for TraI, IHF, and TraY.
