title: Bacterial cells carrying synthetic dual-function operon survived starvation.
abstract: A synthetic dual-function operon with a bistable structure was designed and successfully integrated into the bacterial genome. Bistability was generated by the mutual inhibitory structure comprised of the promoters P(tet) and P(lac) and the repressors LacI and TetR. Dual function essential for cell growth was introduced by replacing the genes (i.e., hisC and leuB) encoding proteins involved in the biosynthesis of histidine and leucine from their native chromosomal locations to the synthetic operon. Both colony formation and population dynamics of the cells carrying this operon showed that the cells survived starvation and the newly formed population transited between the two stable states, representing the induced hisC and leuB levels, in accordance with the nutritional status. The results strongly suggested that the synthetic design of proto-operons sensitive to external perturbations is practical and functional in native cells.
authors.affiliation: Department of Bioinformatics Engineering, Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Ito
authors.forename: Saburo
authors.initials: S
authors.lastname: Tsuru
authors.forename: Bei-Wen
authors.initials: BW
authors.lastname: Ying
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Yomo
mesh_terms: D004926:Escherichia coli / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism; D006639:Histidine / Q000096:biosynthesis / Q000235:genetics; D056968:Lac Repressors / Q000235:genetics / Q000378:metabolism; D007930:Leucine / Q000096:biosynthesis / Q000235:genetics; D009876:Operon / Q000502:physiology*; D011401:Promoter Regions, Genetic / Q000502:physiology*
chemical_list: D029968:Escherichia coli Proteins; D056968:Lac Repressors; C539064:LacI protein, E coli; D006639:Histidine; D007930:Leucine