Molecular display, a technique that presents proteins or peptides on the surface of microorganisms, enables high-throughput screening and has become an essential tool in bimolecular engineering. To display properly, the proteins should be fused to a display motif, translocated through the membrane, and anchored at the cell surface. Many surface proteins, for example, Lpp-ompA, InaK and AIDA-I from Escherichia coli, have been used for displaying target proteins, such as antigens, enzymes, and bioadsorbents [1].