title: Inducible promoter-repressor system from the Lactobacillus casei phage phiFSW.
abstract: With the aim to extend the presently available inducible gene expression systems for lactobacilli, we have isolated a thermoinducible promoter-repressor cassette from the temperate Lactobacillus casei phage phiFSW-TI in Escherichia coli. The phiFSW-TI promoter fragment was abutted to the plasmid-borne promoterless beta-glucuronidase (gusA) reporter gene and shown to direct its transcription in L. casei. In addition, the functionality of the promoter-repressor system was verified in the L. casei phiFSW-TI lysogen by showing that the gusA reporter gene, controlled by the isolated phiFSW-TI promoter, was repressed at 28 degrees C and expressed at 42 degrees C. Moreover, a homology search revealed that the C terminus of the isolated phiFSW repressor shows a high similarity to the small mutS-related domain of the MutS2 protein family that is unprecedented for phage-encoded repressor proteins.
authors.affiliation: Institute of Microbiology and Genetics, Vienna Biocenter, University of Vienna, 1030 Vienna, Austria.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Binishofer
authors.forename: Isabella
authors.initials: I
authors.lastname: Moll
authors.forename: Bernhard
authors.initials: B
authors.lastname: Henrich
authors.forename: Udo
authors.initials: U
authors.lastname: Bläsi
mesh_terms: D000595:Amino Acid Sequence; D001435:Bacteriophages / Q000235:genetics*; D001483:Base Sequence; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D015967:Gene Expression Regulation, Viral; D007780:Lacticaseibacillus casei / Q000821:virology*; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics / Q000502:physiology*; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D013696:Temperature; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism*; D054334:Viral Regulatory and Accessory Proteins
chemical_list: D012097:Repressor Proteins; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; C016649:phage repressor proteins