SpoIIM is on e of four stage II sporulation proteins that is necessary for the forespore inside the mother-cell to be properly internalised through the breakdown of peptidoglycans trapped between the membranes of the septum separating the forespore and the mother-cell. The four proteins working in sequence are SpoIIB, Pfam:PF05036, SpoIIM, SpoIIP, Pfam:PF07454, and finally SpoIID, Pfam:PF08486. D, M and P are in a complex with each other and the complex assembles in a hierarchical manner such that M, which serves as a membrane anchor, recruits P to the septum and P, in turn, recruits D to the septum [1].

1: Engulfment during sporulation in Bacillus subtilis is governed by a multi-protein complex containing tandemly acting autolysins. Chastanet A, Losick R; Mol Microbiol. 2007;64:139-152. PMID:17376078