RRC ID 34335
著者 Sakanaka M, Tamai S, Hirayama Y, Onodera A, Koguchi H, Kano Y, Yokota A, Fukiya S.
タイトル Functional analysis of bifidobacterial promoters in Bifidobacterium longum and Escherichia coli using the α-galactosidase gene as a reporter.
ジャーナル J Biosci Bioeng
Abstract Heterologous gene expression in bifidobacteria requires weak, strong, and inducible promoters depending on the objectives of different expression studies. Weak promoters in Escherichia coli can also be desirable for stable heterologous gene cloning. Here, we developed a reporter system using the Bifidobacterium longum α-galactosidase gene and investigated the activity and inducibility of seven bifidobacterial promoters in B. longum and their activities in E. coli. These studies revealed diverse promoter activities. Three promoters were highly active in B. longum, but only slightly active in E. coli. Among these, two phosphoketolase gene (xfp) promoters exhibited strong activity in B. longum cells grown on glucose. In contrast, the promoter activity of the fructose transporter operon (fruEKFG) was strongly induced by carbohydrates other than glucose, including fructose, xylose, and ribose. These promoters will allow strong or highly inducible expression in bifidobacteria and stable gene cloning in E. coli. In contrast to the functions of these promoters, the promoter of sucrose-utilization operon cscBA showed very high activity in E. coli but low activity in B. longum. Other three promoters were functional in both B. longum and E. coli. In particular, two sucrose phosphorylase gene (scrP) promoters showed inducible activity by sucrose and raffinose in B. longum, indicating their applicability for regulated expression studies. The diverse promoter functions revealed in this study will contribute to enabling the regulated expression of heterologous genes in bifidobacteria research.
巻・号 118(5)
ページ 489-95
公開日 2014-11-1
DOI 10.1016/j.jbiosc.2014.05.002
PII S1389-1723(14)00155-8
PMID 24932968
MeSH Bifidobacterium / drug effects Bifidobacterium / genetics* Carbohydrates / pharmacology Escherichia coli / drug effects Escherichia coli / genetics* Gene Expression Regulation, Bacterial / drug effects Gene Expression Regulation, Bacterial / genetics* Genes, Reporter / genetics* Operon / drug effects Operon / genetics Promoter Regions, Genetic / genetics* Up-Regulation / drug effects alpha-Galactosidase / genetics*
IF 2.366
WOS 分野 FOOD SCIENCE & TECHNOLOGY BIOTECHNOLOGY & APPLIED MICROBIOLOGY
リソース情報
一般微生物 JCM 1190