Required for the insertion and/or proper folding and/or complex formation of integral membrane proteins into the membrane. Involved in integration of membrane proteins that insert both dependently and independently of the Sec translocase complex, as well as at least some lipoproteins. Interacts with KhpB (also called EloR/Jag). Alters the localization of KhpB which localizes not only to the midcell but also the old cell poles. No change in localization of MltG. Belongs to the OXA1/ALB3/YidC family. Type 2 subfamily.