title: Characterization of a region of plasmid pBL1 of Brevibacterium lactofermentum involved in replication via the rolling circle model.
abstract: The minimal region for autonomous replication of pBL1, a 4.5-kb cryptic plasmid of Brevibacterium lactofermentum ATCC 13869 that has been used to construct a variety of corynebacterium vectors, was shown to be contained on a 1.8-kb HindII-SphI DNA fragment. This region contains two open reading frames (ORFs) (ORF1 and ORF5) which are essential for pBL1 replication in B. lactofermentum. Accumulation of single-strand intermediates in some of the constructions indicates that plasmid pBL1 replicates via the rolling circle replication model; its plus strand and minus strand were identified by hybridization with two synthetic oligonucleotide probes complementary to each pBL1 strand. ORF1 seems to encode the Rep protein and showed partial homology with sequences for Rep proteins from Streptomyces plasmids which replicate via rolling circle replication such as pIJ101, pSB24, and pJV1.
authors.affiliation: Section of Microbiology, Faculty of Biology, University of León, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Fernandez-Gonzalez
authors.forename: R F
authors.initials: RF
authors.lastname: Cadenas
authors.forename: M F
authors.initials: MF
authors.lastname: Noirot-Gros
authors.forename: J F
authors.initials: JF
authors.lastname: Martin
authors.forename: J A
authors.initials: JA
authors.lastname: Gil
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics; D001483:Base Sequence; D001951:Brevibacterium / Q000235:genetics*; D004265:DNA Helicases; D004261:DNA Replication / Q000235:genetics*; D004269:DNA, Bacterial / Q000096:biosynthesis*; D004270:DNA, Circular / Q000096:biosynthesis*; D004277:DNA, Single-Stranded / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics; D005822:Genetic Vectors / Q000235:genetics; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009690:Nucleic Acid Conformation; D009693:Nucleic Acid Hybridization; D015345:Oligonucleotide Probes; D016366:Open Reading Frames / Q000235:genetics; D010957:Plasmids / Q000145:classification / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D015534:Trans-Activators
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004270:DNA, Circular; D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; D015345:Oligonucleotide Probes; D015534:Trans-Activators; C045264:replication initiator protein; D004265:DNA Helicases