This domain is found in bacteria. This domain is typically between 65 to 81 amino acids in length. This domain is found associated with pfam01145. This domain is the N terminal of the bacterial membrane protein HflK. HflK complexes with HflC to form a membrane protease which is modulated by the GTPase HflX. The N terminal domain of HflK is the membrane spanning region which anchors the protein in the bacterial membrane.