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논문 기본 정보

자료유형
학술저널
저자정보
(Department of Animal Resources Science, Dankook University) (Department of Animal Resources Science, Dankook University) (Department of Animal Resources Science, Dankook University) (Department of Animal Resources Science, Dankook University)
저널정보
한국축산식품학회 Food science of animal resources Food science of animal resources 제39권 제1호
발행연도
수록면
13 - 22 (10page)

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초록· 키워드

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 Lactobacillus johnsonii PF01, were chosen. Each promoter was amplified by polymerase chain reaction and fused upstream of the ${\beta}$-glucuronidase gene as a reporter, respectively. Then, these constructs were cloned into E. coli-Lactobacillus shuttle vector pULP2, which was generated by the fusion of pUC19 with the L. plantarum plasmid pLP27. Finally, the constructed vectors were introduced into L. plantarum 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 L. plantarum until 80 generations without selection pressure. A bile-responsive expression vector, $pULP3-P_{LDH}$, for Lactobacillus 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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