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GENOME ANNOUNCEMENTS

Genome Sequences of Pelagibaca bermudensis HTCC2601T and Maritimibacter alkaliphilus HTCC2654T, the Type Strains of Two Marine Roseobacter Genera

J. Cameron Thrash, Jang-Cheon Cho, Steve Ferriera, Justin Johnson, Kevin L. Vergin, Stephen J. Giovannoni
J. Cameron Thrash
1Department of Microbiology, Oregon State University, Corvallis, Oregon 97331
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Jang-Cheon Cho
2Division of Biology and Ocean Sciences, Inha University, Incheon 402-751, Republic of Korea
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Steve Ferriera
3J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850
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Justin Johnson
3J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, Maryland 20850
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Kevin L. Vergin
1Department of Microbiology, Oregon State University, Corvallis, Oregon 97331
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Stephen J. Giovannoni
1Department of Microbiology, Oregon State University, Corvallis, Oregon 97331
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  • For correspondence: steve.giovannoni@oregonstate.edu
DOI: 10.1128/JB.00873-10
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ABSTRACT

Pelagibaca bermudensis HTCC2601T and Maritimibacter alkaliphilus HTCC2654T represent two marine genera in the globally significant Roseobacter clade of the Alphaproteobacteria. Here, we present the genome sequences of these organisms, isolated from the Sargasso Sea using dilution-to-extinction culturing, which offer insight into the genetic basis for the metabolic and ecological diversity of this important group.

Organisms from the Roseobacter clade of the Alphaproteobacteria are numerically significant in the world's oceans and have been found in a wide range of habitats (1, 3). Using previously described high-throughput dilution-to-extinction culturing (6, 13), the marine Roseobacter strains Pelagibaca bermudensis HTCC2601T and Maritimibacter alkaliphilus HTCC2654T were isolated in low-nutrient heterotrophic medium (LNHM) (4) from surface water collected at the Bermuda Atlantic Time-Series Study (BATS) site in the western Sargasso Sea (5, 9). As the type strains for two genera of this globally prolific Roseobacter group, P. bermudensis and M. alkaliphilus were selected for shotgun genome sequencing at the J. Craig Venter Institute through the Moore Foundation Microbial Genome Sequencing Project (http://www.moore.org/microgenome ). Draft genomes of P. bermudensis and M. alkaliphilus, with 103 and 46 contigs, respectively, were annotated and analyzed through the Joint Genome Institute IMG/M website (http://img.jgi.doe.gov/cgi-bin/pub/main.cgi ) (10).

The draft genomes of P. bermudensis and M. alkaliphilus comprise 5,425,920 and 4,529,231 bases, 5,522 and 4,764 predicted open reading frames (ORFs), and 66.44% and 64.13% G+C content, respectively. The P. bermudensis genome is predicted to contain 56 tRNA genes, five 5S rRNA genes, four 16S rRNA genes, and five 23S rRNA genes, and that of M. alkaliphilus 49 tRNA genes and one each of the 5S, 16S, and 23S rRNA genes. Both genomes have putative genes for complete glycolysis and Entner-Doudoroff pathways, a complete tricarboxylic acid cycle, and predicted metabolic pathways for the oxidation of C1 compounds. Both have predicted genes for the synthesis of most essential amino acids and some vitamins and cofactors. Each has putative genes for the utilization of fructose, sucrose, and mannose, confirmed in physiological testing of P. bermudensis (5) but not for M. alkaliphilus (9). P. bermudensis contains a predicted complete RuBisCO complex, unique to the sequenced Roseobacter species (12, 15), a complete assimilatory nitrate reduction pathway, and several type VI secretion genes. M. alkaliphilus is predicted to have complete nitrate reduction pathways to both N2 and ammonia and most type IV secretion genes. Both are predicted to have complete sec pathways and large numbers of ABC transporters (362 in P. bermudensis and 224 in M. alkaliphilus), similar to other Roseobacter strains (15).

M. alkaliphilus was named because of its alkaline growth optimum at pH 10. Na+/H+ antiporters have been shown to be involved in conferring alkaliphilic phenotypes for a variety of organisms by increasing internal cellular H+ concentrations in alkaline conditions where Na+ is present (2, 7, 8, 14, 16, 17). As expected, the genome of M. alkaliphilus contains two putative Na+/H+ antiporters, one homologous to nhaP, important for alkaliphily in several strains (2, 16, 17), and another located adjacent to predicted ABC transporter genes for capsular polysaccharide export.

Nucleotide sequence accession numbers.

The draft genome sequences of Pelagibaca bermudensis HTCC2601T and Maritimibacter alkaliphilus HTCC2654T are available in GenBank under the accession numbers AATQ00000000 and AAMT00000000, respectively. Data annotated independently by GenDB (11) are accessible in the Marine Microbial Genomics database at Oregon State University (http://bioinfo.cgrb.oregonstate.edu/microbes/ ).

ACKNOWLEDGMENTS

Sequencing, assembly, and annotation and data analysis were supported by the Gordon and Betty Moore Foundation Marine Microbiology Initiative as part of its Marine Microbial Sequencing Project (www.moore.org/marinemicro ) and by an individual investigator award to S.J.G.

FOOTNOTES

    • Received 26 July 2010.
    • Accepted 6 August 2010.
  • Copyright © 2010 American Society for Microbiology

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Genome Sequences of Pelagibaca bermudensis HTCC2601T and Maritimibacter alkaliphilus HTCC2654T, the Type Strains of Two Marine Roseobacter Genera
J. Cameron Thrash, Jang-Cheon Cho, Steve Ferriera, Justin Johnson, Kevin L. Vergin, Stephen J. Giovannoni
Journal of Bacteriology Sep 2010, 192 (20) 5552-5553; DOI: 10.1128/JB.00873-10

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Genome Sequences of Pelagibaca bermudensis HTCC2601T and Maritimibacter alkaliphilus HTCC2654T, the Type Strains of Two Marine Roseobacter Genera
J. Cameron Thrash, Jang-Cheon Cho, Steve Ferriera, Justin Johnson, Kevin L. Vergin, Stephen J. Giovannoni
Journal of Bacteriology Sep 2010, 192 (20) 5552-5553; DOI: 10.1128/JB.00873-10
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KEYWORDS

Alphaproteobacteria
Genome, Bacterial

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