Figure 4

Domain architecture of PAAR repeat proteins associated of Pantoea ananatis type VI secretion system 1 and 2 (T6SS-1 and T6SS-2). We used the nomenclature of Shneider et al. [59], which categorized PAAR proteins into different classes [1–7] based on domain architecture. The different domains and extensions associates with P. ananatis PAAR proteins are indicated by different colors. No putative effector domains were associated with N or C-terminal extensions located in most PAAR repeat proteins of P. ananatis. However, the RhsD protein of LMG 5342, LMG 2665^T and B1-9 showed extensive structural homology to the insecticidal YenC2 toxins of Yersinia entomophaga. The domain architecture of P. ananatis RhsD protein is similar to the RhsB endonuclease toxin of Dickeya dadantii.