Part of a cell division machinery (PubMed:18987308, PubMed:21255729). The CdvA, CdvB and CdvC proteins polymerize between segregating nucleoids and persist throughout cell division, forming a successively smaller structure during constriction (PubMed:18987308). CdvA is a membrane interacting protein that recruits ESCRT-III homologs to the membrane (PubMed:21255729). Interacts with CdvB. Forms, with CdvB, colocalized band-like structures between segregating nucleoids. Induced around the genome segregation and cell division stages. Down-regulated after UV irradiation, indicating division inhibition in response to DNA damage. The C-terminal 18 residues mediate the interaction with the wH-like region of CdvB.