Part of the ABC transporter complex MalEFGK involved in maltose/maltodextrin import. Probably responsible for the translocation of the substrate across the membrane. The complex is composed of two ATP-binding proteins (MalK), two transmembrane proteins (MalG and MalF) and a solute-binding protein (MalE). Protein stability and stable complex formation require YidC. When MalF EAA loop mutations are made concomitantly with MalG EAA loop mutations, a complete loss of transport and complex formation is observed. This suggests that the MalF-MalG interaction may be important for the proper assembly and also for the correct function of the transporter. Belongs to the binding-protein-dependent transport system permease family. MalFG subfamily.