Abstract
We have constructed a constitutive high-level-expression vector for the genus Bifidobacterium and used it to express cholesterol oxidase from Streptomyces coelicola. The promoter region of the 16S rRNA gene was amplified by inverse PCR and used for the construction of pBES16PR. The optimal ribosome-binding site (RBS) for Bifidobacterium was incorporated in pBES16PR. In order to test the efficacy of this expression vector, we constructed pBES16PR-CHOL with the structural gene for cholesterol oxidase under the control of the 16S rRNA promoter, and used it to transform Bifidobacterium longum. The gene was successfully expressed and high level of cholesterol oxidase activity was obtained in B. longum. This is the first report of an expression vector for the genus Bifidobacterium using a 16S rRNA gene promoter and successful expression of cholesterol oxidase.
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This work was supported by the 21C Frontier Microbial Genomics and Applications Center Program, Ministry of Science and Technology (Grant MG05-0307-1-0), Republic of Korea.
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Myeong Soo Park and Bin Kwon contributed equally.
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Park, M.S., Kwon, B., Shim, J.J. et al. Heterologous expression of cholesterol oxidase in Bifidobacterium longum under the control of 16S rRNA gene promoter of bifidobacteria. Biotechnol Lett 30, 165–172 (2008). https://doi.org/10.1007/s10529-007-9514-3
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DOI: https://doi.org/10.1007/s10529-007-9514-3