Part of the ABC transporter FtsEX involved in cellular division. Forms a membrane-associated complex with FtsE. Viable. Exhibits morphological abnormalities indicative of defective division sites. While division in wild-type cells occurs along sequential, alternating division planes, the mutant is characterized by the presence of multiple and atypically arranged division sites which frequently divide the cytoplasm into small cellular compartments. In wild-type cells, the replication and segregation of DNA precedes the ingrowth of a septum resulting in two equally sized daughter cells, the process of which is not seen in mutant cells. Presence of large vacuole-like spaces in the cytoplasm which appear to be filled with condensed DNA (but few ribosomes) that has not been able to correctly segregate during cell division. Belongs to the ABC-4 integral membrane protein family. FtsX subfamily.