Hol-Tox family
The putative holin-like toxin family consists of many small proteins, between 34 and 48 amino acyl residues with a single transmembrane segment. Rajesh et al. first identified the gene and designated it tmp1, which coded for a 34 amino acyl peptide that acts as an antibacterial agent on gram-positive bacteria. This peptide exhibits a single transmembrane domain that is believed to play a role in facilitating the antibacterial activity. A representative list of proteins belonging to the Hol-Tox family can be found in the Transporter Classification Database.