Toxin secreted by the H1 type VI (H1-T6SS) secretion system into the periplasm of recipient cells. Degrades peptidoglycan via amidase activity thereby helping itself to compete with other bacteria (PubMed:21776080, PubMed:22931054, PubMed:22813741, PubMed:22700987). To protect itself, the bacterium synthesizes immunity protein Tsi1 that specifically interacts with and inactivates cognate toxin (PubMed:21776080, PubMed:22931054, PubMed:22700987). Hydrolysis of gamma-D-glutamyl bonds to the L-terminus (position 7) of meso-diaminopimelic acid (meso-A2pm) in 7-(L-Ala-gamma-D-Glu)-meso-A2pm and 7-(L-Ala-gamma-D-Glu)-7-(D-Ala)-meso-A2pm. It is required that the D-terminal amino and carboxy groups of meso-A2pm are unsubstituted. Forms an heterotetramer with Tsi1 consisting of two Tse1 dimers and two Tsi1 dimers. Formation of the complex inactivates Tse1 enzymatic activity. Delivered to the target cell periplasm by the H1 type VI (H1-T6SS) secretion system.