Type VI secretion exported toxin that via to its DNase activity induces growth arrest and ultimately DNA degradation within target cell (PubMed:30455305). The activity is initially neutralized by a cognate immunity protein Tsi7 (PubMed:30455305). Endonucleolytic cleavage to 5'-phosphodinucleotide and 5'-phosphooligonucleotide end-products. Interacts with Tsi7.