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 (By similarity). Partially complements an E.coli yidC depletion experiment. No visible phenotype. Belongs to the OXA1/ALB3/YidC family. Type 2 subfamily.