Part of the type VI secretion system specialized secretion system, which delivers several virulence factors in both prokaryotic and eukaryotic cells during infection (PubMed:23362380, PubMed:23341465). Forms the spike at the tip of the elongating tube formed by haemolysin co-regulated protein Hcp. Allows the delivery of the TseL antibacterial toxin to target cells where it exerts its toxicity (PubMed:23362380). Additionally, acts directly as an effector and targets the cell wall peptidoglycan layer of prey cells for degradation via its C-terminus (PubMed:23362380, PubMed:23341465). Toxicity is counteracted by a cognate immunity protein TsiV3 (PubMed:23362380, PubMed:24699653, PubMed:23341465). Interacts with TsiV3 (PubMed:24751834, PubMed:24699653, PubMed:23341465). Interacts with TseL (PubMed:23362380). Mutants are unable to secrete TseL. Belongs to the VgrG protein family.