|
KMID : 0545120150250122100
|
|
Journal of Microbiology and Biotechnology
2015 Volume.25 No. 12 p.2100 ~ p.2105
|
|
|
Development of Bile Salt-Resistant Leuconostoc citreum by Expression of Bile Salt Hydrolase Gene
|
|
Cho Seung-Kee
Lee Soo-Jin
Shin So-Yeon
Moon Jin-Seok
Li Ling
Joo Woo-Ha
Kang Dae-Kyung
Han Nam-Soo
|
|
|
Abstract
|
|
|
|
Probiotic bacteria must have not only tolerance against bile salt but also no genes for antibiotic resistance. Leuconostoc citreum is a dominant lactic acid bacterium in various fermented foods, but it is not regarded as a probiotic because it lacks bile salt resistance. Therefore, we aimed to construct a bile salt-resistant L. citreum strain by transforming it with a bile salt hydrolase gene (bsh). We obtained the 1,001 bp bsh gene from the chromosomal DNA of Lactobacillus plantarum and subcloned it into the pCB4170 vector under a constitutive P710 promoter. The resulting vector, pCB4170BSH was transformed into L. citreum CB2567 by electroporation, and bile saltresistant transformants were selected. Upon incubation with glycodeoxycholic acid sodium salt (GDCA), the L. citreum transformants grew and formed colonies, successfully transcribed the bsh gene, and expressed the BSH enzyme. The recombinant strain grew in up to 0.3% (w/v) GDCA, conditions unsuitable for the host strain. In in vitro digestion conditions of 10 mM bile salt, the transformant was over 67.6% viable, whereas only 0.8% of the host strain survived.
|
|
|
KEYWORD
|
|
|
Leuconostoc citreum, probiotics, bile salt hydrolase
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
  
|