SPP1 holin family
The SPP1 Holin Family consists of proteins of between 90 and 160 amino acyl residues in length that exhibit two transmembrane segments. SPP1 is a double-stranded DNA phage that infects the Gram-positive bacteria. Although annotated as holins, members of the SPP1 family are not yet functionally characterized. A representative list of proteins belonging to the SPP1 Holin family can be found in .