Fig. 5

Gene organization and phylogenetic relationships of type VI secretion system (T6SS) gene clusters in Enterobacter species. A Schematic representation of the identified T6SS genes in Enterobacter species. Three types of T6SS gene clusters were detected among the 49 strains, named T6SS-A, T6SS-B and T6SS-C. The Clusters of Orthologous Groups (COG) IDs were presented under the genes in the clusters. B The phylogenetic trees was constructed using amino acid sequences of TssC in Enterobacter strains and 31 well-studied T6SSs (black). In general, T6SS gene clusters were classified into 3 groups (i-iii), and the group i was composed of six subfamilies (i1, i2, i3, i4a, i4b and i5). Our Enterobacter T6SSs were shown in red, pink and blue colors