The SPP1 Holin (SPP1 Holin) Family (TC# 1.E.31) consists of proteins of between 90 and 160 amino acyl residues (aas) in length that exhibit two transmembrane segments (TMSs).
SPP1 is a double-stranded DNA phage that infects the Gram-positive bacteria.
[1] 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 Transporter Classification Database.
[2] As of this edit, this article uses content from "1.E.31 The SPP1 Holin (SPP1 Holin) Family", which is licensed in a way that permits reuse under the Creative Commons Attribution-ShareAlike 3.0 Unported License, but not under the GFDL.