title: Molecular dissection of a bifidobacterial replicon.
abstract: The 2.1-kb cryptic plasmid pCIBAO89 from Bifidobacterium asteroides harbors a 1.4-kb segment which is sufficient for its autonomous replication. The segment is divided into two parts, the presumed replication origin, ori89, and the rep gene encoding the putative 41-kDa Rep89 replication initiation protein. This minimal replication region of pCIBAO89 was functionally dissected by transcriptional analyses as well as by DNA-binding studies, and the information obtained was exploited to create a number of Escherichia coli-Bifidobacterium shuttle vectors capable of transforming various bifidobacteria with an efficiency of up to 10(6) transformants/mug DNA.
authors.affiliation: Department of Microbiology, National University of Ireland, Western Road, Cork, Ireland.
authors.forename: Michelle
authors.initials: M
authors.lastname: Cronin
authors.forename: Moritz
authors.initials: M
authors.lastname: Knobel
authors.forename: Mary
authors.initials: M
authors.lastname: O'Connell-Motherway
authors.forename: Gerald F
authors.initials: GF
authors.lastname: Fitzgerald
authors.forename: Douwe
authors.initials: D
authors.lastname: van Sinderen
mesh_terms: D001644:Bifidobacterium / Q000235:genetics*; D004265:DNA Helicases / Q000235:genetics / Q000378:metabolism; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics; D005822:Genetic Vectors / Q000235:genetics; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics*; D011485:Protein Binding; D018741:Replication Origin / Q000235:genetics; D012093:Replicon / Q000235:genetics*; D017422:Sequence Analysis, DNA; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic; D014169:Transformation, Bacterial
chemical_list: D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D015534:Trans-Activators; C045264:replication initiator protein; D004265:DNA Helicases