Non-essential cell division protein. Interacts in vitro with multiple Fts proteins, including FtsQ and FtsN. Localizes at the septal ring (PubMed:19684127, PubMed:19880599, PubMed:23290046). Recruitment to the septal ring requires FtsZ (PubMed:19880599). The SPOR domain binds septal peptidoglycans and is required to target DamX to the septal ring. Deletion mutant shows no obvious phenotype, but absence of the protein aggravates the division defect in ftsN or dedD mutants. Overexpression induces cell filamentation. Belongs to the DamX family.