PMC:3569359 / 511-4121
Annnotations
{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/3569359","sourcedb":"PMC","sourceid":"3569359","source_url":"http://www.ncbi.nlm.nih.gov/pmc/3569359","text":"GENOME ANNOUNCEMENT\nThe genus Thermus comprises \u003e15 species of thermophilic bacteria, including the biotechnologically exalted Thermus aquaticus and the genetically tractable Thermus thermophilus. We reported previously the isolation of a large number of Thermus strains from the Great Boiling Spring system in the U.S. Great Basin, typified by Thermus oshimai JL-2 and Thermus thermophilus JL-18, and described their roles in incomplete denitrification in situ (1, 2).\nThe genomes of T. oshimai JL-2 and T. thermophilus JL-18 were sequenced using 454-GS-FLX Titanium and Illumina GA II (2 × 75 bp) methodologies, were assembled using Newbler version 2.3 (prerelease), and were annotated using Prodigal version 1.4, Gene Prediction Improvement Pipeline (GenePRIMP) at the Joint Genome Institute (JGI) in Walnut Creek, CA. The data are available at the Joint Genome Institute (JGI) Integrated Microbial Genomes (IMG) website (3). T. oshimai JL-2 contains a 2.07-Mb circular chromosome carrying 2,205 predicted genes; a circular megaplasmid, pTHEOS01 (0.27 Mb, 268 predicted genes); and a smaller circular plasmid, pTHEOS02 (57.2 kb, 75 predicted genes). T. thermophilus JL-18 has a 1.9-Mb circular chromosome carrying 2,057 predicted genes; a circular megaplasmid, pTTJL1801 (0.26 Mb, 279 predicted genes); and a smaller circular plasmid, pTTJL1802 (0.14 Mb, 172 predicted genes).\nThe chromosome of T. thermophilus JL-18 was similar to those of T. thermophilus HB8 and T. thermophilus HB27, apart from a few chromosomal rearrangements (4). However, extensive rearrangements were observed in the T. thermophilus JL-18 megaplasmid pTTJL1801 when compared to the T. thermophilus HB8 and HB27 megaplasmids; this is consistent with the elevated plasticity reported previously for Thermus megaplasmids (5). The chromosome and megaplasmid of T. oshimai JL-2 pTHEOS01 exhibit little or no synteny with any of the complete Thermus genomes.\nThe megaplasmids of both species include a complete nitrate reductase operon (narGHJIK). T. oshimai JL-2 possesses two nitrate/nitrite transporters (narK1 and narK2), which is similar to T. thermophilus HB8 (6), whereas T. thermophilus JL-18 possesses a single copy of narK. Genes encoding nitrite reductase (nirS and nirK in T. oshimai JL-2 and nirS in T. thermophilus JL-18) and nitric oxide reductase (norB and norC) were also identified in close proximity to the narGHIJK operon in the megaplasmids of both T. thermophilus JL-18 and T. oshimai JL-2. However, nitrous oxide reductase (nos) genes, which are needed for the conversion of nitrous oxide to dinitrogen, are absent, concurrent with the incomplete denitrification phenotype of these strains and the high flux of nitrous oxide reported at Great Boiling Spring (2). Both megaplasmids also possess genes encoding a DNA repair system that is proposed to impart thermophily in T. thermophilus HB8 and HB27 (5). A sox gene cluster that includes a sulfite dehydrogenase gene (soxCD) essential for the chemotrophic growth of Paracoccus pantotrophus (7) was identified in T. oshimai JL-2 and T. thermophilus JL-18 chromosomes, suggesting that these organisms can carry out sulfur oxidation.\n\nNucleotide sequence accession numbers.\nThe genome sequences from this study are available from GenBank under the following accession no: CP003249.1 (T. oshimai JL-2 chromosome), CP003250.1 (T. oshimai JL-2 megaplasmid pTHEOS01), CP003251.1 (T. oshimai JL-2 plasmid pTHEOS02), CP003252.1 (T. thermophilus JL-18 chromosome), CP003253.1 (T. thermophilus JL-18 plasmid pTTJL1801), and CP003254.1 (T. thermophilus JL-18 plasmid 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