title: Two novel conjugative plasmids from a single strain of Sulfolobus.
abstract: Two conjugative plasmids (CPs) were isolated and characterized from the same 'Sulfolobus islandicus' strain, SOG2/4. The plasmids were separated from each other and transferred into Sulfolobus solfataricus. One has a high copy number and is not stable (pSOG1) whereas the other has a low copy number and is stably maintained (pSOG2). Plasmid pSOG2 is the first Sulfolobus CP found to have these characteristics. The genomes of both pSOG plasmids have been sequenced and were compared to each other and the available Sulfolobus CPs. Interestingly, apart from a very well-conserved core, 70 % of the pSOG1 and pSOG2 genomes is largely different and composed of a mixture of genes that often resemble counterparts in previously described Sulfolobus CPs. However, about 20 % of the predicted genes do not have known homologues, not even in other CPs. Unlike pSOG1, pSOG2 does not contain a gene for the highly conserved PlrA protein nor for obvious homologues of partitioning proteins. Unlike pNOB8 and pKEF9, both pSOG plasmids lack the so-called clustered regularly interspaced short palindrome repeats (CRISPRs). The sites of recombination between the two genomes can be explained by the presence of recombination motifs previously identified in other Sulfolobus CPs. Like other Sulfolobus CPs, the pSOG plasmids possess a gene encoding an integrase of the tyrosine recombinase family. This integrase probably mediates plasmid site-specific integration into the host chromosome at the highly conserved tRNA(Glu) loci.
authors.affiliation: UMR CNRS 6539, IUEM, Université de Bretagne Occidentale, Technopôle Brest-Iroise, Place Copernic, 29280 Plouzané, France.|Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands.
authors.forename: Gaël
authors.initials: G
authors.lastname: Erauso
authors.affiliation: Biology Department, Portland State University, Portland, OR 97207, USA.|Max-Planck-Institut für Biochemie, Martinsried, Germany.
authors.forename: Kenneth M
authors.initials: KM
authors.lastname: Stedman
authors.affiliation: Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands.
authors.forename: Harmen J G
authors.initials: HJG
authors.lastname: van de Werken
authors.affiliation: Max-Planck-Institut für Biochemie, Martinsried, Germany.
authors.forename: Wolfram
authors.initials: W
authors.lastname: Zillig
authors.affiliation: Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands.
authors.forename: John
authors.initials: J
authors.lastname: van der Oost
mesh_terms: D001483:Base Sequence; D004251:DNA Transposable Elements; D018628:Gene Dosage; D005822:Genetic Vectors; D020745:Genome, Archaeal; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D009876:Operon; D010957:Plasmids / Q000235:genetics*; D011995:Recombination, Genetic; D016944:Sulfolobus / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D004251:DNA Transposable Elements