This study aimed to develop a bile-responsive expression system for lactobacilli. The promoters of four genes, encoding phosphoenolpyruvate-dependent sugar phosphotransferase (mannose-specific), L-lactate dehydrogenase (LDH), HPr kinase, and D-alanine-D-alanine ligase, respectively, which were highly expressed by bile addition in PF01, were chosen. Each promoter was amplified by polymerase chain reaction and fused upstream of the β-glucuronidase gene as a reporter, respectively. Then, these constructs were cloned into - shuttle vector pULP2, which was generated by the fusion of pUC19 with the plasmid pLP27. Finally, the constructed vectors were introduced into for a promoter activity assay. The LDH promoter showed the highest activity and its activity increased 1.8-fold by bile addition. The constructed vector maintained in until 80 generations without selection pressure. A bile-responsive expression vector, pULP3-P, for spp. can be an effective tool for the bile-inducible expression of bioactive proteins in intestine after intake in the form of fermented dairy foods.
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