Part of the ABC transporter complex involved in maltodextrin import. Binds maltodextrin. Can also bind maltose with low affinity, but is not involved in its uptake. Inhibited by glucose and lactose. The complex is composed of two ATP-binding proteins (MsmX), two transmembrane proteins (MdxF and MdxG) and a solute-binding protein (MdxE). Induced by maltose and repressed by glucose. Maltodextrin can also be transported inside the cell after degradation to maltose by extracellular amylase AmyE, transported as maltose by MalP. Belongs to the bacterial solute-binding protein 1 family.