This family consists of the stage V sporulation (SpoV) proteins of Bacillus subtilis which includes SpoVM. SpoVM is an small, 26 residue-long protein that is produced in the mother cell chamber of the sporangium during the process of sporulation in B. subtilis. SpoVM forms an amphipathic alpha-helix and is recruited to the polar septum shortly after the sporangium undergoes asymmetric division. The function of SpoVM depends on proper subcellular localisation [1].

1: Subcellular localization of a small sporulation protein in Bacillus subtilis. van Ooij C, Losick R; J Bacteriol 2003;185:1391-1398. PMID:12562810