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GENOME ANNOUNCEMENT

Complete Genome Sequence of “Candidatus Puniceispirillum marinum” IMCC1322, a Representative of the SAR116 Clade in the Alphaproteobacteria

Hyun-Myung Oh, Kae Kyoung Kwon, Ilnam Kang, Sung Gyun Kang, Jung-Hyun Lee, Sang-Jin Kim, Jang-Cheon Cho
Hyun-Myung Oh
1Division of Biology and Ocean Sciences, Inha University, Incheon 402-751, Republic of Korea
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Kae Kyoung Kwon
2 Marine Biotechnology Research Center, Korea Ocean Research & Development Institute, Ansan 425-600, Republic of Korea
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Ilnam Kang
1Division of Biology and Ocean Sciences, Inha University, Incheon 402-751, Republic of Korea
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Sung Gyun Kang
2 Marine Biotechnology Research Center, Korea Ocean Research & Development Institute, Ansan 425-600, Republic of Korea
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Jung-Hyun Lee
2 Marine Biotechnology Research Center, Korea Ocean Research & Development Institute, Ansan 425-600, Republic of Korea
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Sang-Jin Kim
2 Marine Biotechnology Research Center, Korea Ocean Research & Development Institute, Ansan 425-600, Republic of Korea
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  • For correspondence: chojc@inha.ac.kr s-jkim@kordi.re.kr
Jang-Cheon Cho
1Division of Biology and Ocean Sciences, Inha University, Incheon 402-751, Republic of Korea
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  • For correspondence: chojc@inha.ac.kr s-jkim@kordi.re.kr
DOI: 10.1128/JB.00347-10
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ABSTRACT

The complete genome sequence of “Candidatus Puniceispirillum marinum” IMCC1322, the first cultured representative of the SAR116 clade in the Alphaproteobacteria, is reported here. The genome contains genes for proteorhodopsin, aerobic-type carbon monoxide dehydrogenase, dimethylsulfoniopropionate demethylase, and C1 compound metabolism. The genome information proposes the SAR116 group to be metabolic generalists in ocean nutrient cycling.

Ever since the first description of the SAR116 clade (2, 4), members of this unique alphaproteobacterial group have been found in various marine environments based on culture-independent approaches (4, 10). The SAR116 clade has been regarded as a ubiquitous but uncultured lineage of marine bacterioplanktons (5). Isolated from a surface seawater sample from the Western Pacific Ocean Margin (East Sea of Korea), “Candidatus Puniceispirillum marinum” IMCC1322 was subjected to whole-genome sequencing. Here we report the complete genome sequence of IMCC1322, the first cultured representative of the SAR116 clade. Genomic DNA of IMCC1322 was prepared, shotgun sequenced, and analyzed by Macrogen, Inc. (Seoul, South Korea). Open reading frame (ORF) prediction and annotation were done with the EMFAS software program (Ensoltek, Inc., Daejeon, South Korea) using homology searches in the NCBI/UniProt databases and non-homology-based function annotations (genome context analysis).

The circular chromosome of IMCC1322 was 2,753,527 bp in length (48.85 G+C mol%) with a single rRNA operon and no extrachromosomal genetic element. A putative prophage sequence was found at base pair positions 405,417 to 424,699 (19,283 bp in length) by the phage_finder software program (3). Two thousand, five hundred forty-six predicted ORFs of the IMCC1322 genome showed the best blast hits to genomes of Magnetospirillum magneticum AMB-1 (210; 8.2%) and Rhodospirillum rubrum ATCC 11170 (190; 7.2%), members of the Rhodospirillaceae that have been proposed to be distant phylogenetic affiliates of the SAR116 clade (5). IMCC1322 had an impaired Embden-Meyerhoff-Parnas pathway due to the lack of 6-phosphofructokinase, but it possessed Entner-Doudoroff pathway genes encoding 6-phosphogluconate dehydratase and 2-dehydro-3-deoxyphosphogluconate aldolase. The IMCC1322 genome contained nitrate reductase, sulfate reductase, and an inorganic phosphate uptake system, including the phosphate regulon sensor phoR and a high-affinity ABC phosphate transporter system, polyphosphate kinase, and exopolyphosphatase/GppA phosphatase.

The most interesting features of the IMCC1322 genome are genes of biogeochemical importance in the ocean surface, encoding proteorhodopsin (PR), carbon monoxide dehydrogenase (CODH), C1 compound metabolism, and dimethylsulfoniopropionate (DMSP) demethylase (encoded by dmdA). The IMCC1322 PR gene was followed by retinal biosynthesis gene clusters of the rhodopsin chromophore (crtE-crtI-crtB-crtY). PR, known as the light-driven proton pump (1, 11), may help IMCC1322 compete in the ocean surface because IMCC1322 has many ATP-independent electrochemical transporters, as well as ABC-type transporter genes. The genome is predicted to contain genes for the form II (Bradyrhizobium, Mesorhizobium, and Sinorhizobium [BMS]) large subunit of CODH (coxL) with the AYXGAGR active-site motif (8), along with the medium (coxM) and small (coxS) subunits in the arrangement coxSLM. Strain IMCC1322 possesses genes for metabolism of C1 compounds: methanol, formaldehyde, formate, formamide, and methanesulfonate. The genome of strain IMCC1322 contained a gene for glycine/serine hydroxymethyltransferase to enter into an assimilatory serine cycle via the serine pathway (9). Strain IMCC1322 had a DMSP demethylase gene similar to dmdA of “Candidatus Pelagibacter ubique” HTCC1062 (6, 7) and Silicibacter pomeroyi DSS-3 (7), and IMCC1322 also had dimethyl sulfoxide (DMSO) reductase.

“Candidatus Puniceispirillum marinum” IMCC1322 is expected to be a metabolic generalist carrying functional genes for utilizing resourceful sunlight, DMSP, CO, and C1 compounds in the surface ocean. Such metabolic potential of strain IMCC1322, the first cultured representative of the SAR116 clade, might reflect ecological niches for even more dominant marine bacterioplankton clades SAR11, Roseobacter, and SAR86.

Nucleotide sequence accession number.

The complete genome sequence of strain IMCC1322 is available in GenBank under accession number CP001751.

ACKNOWLEDGMENTS

This research was supported by the Marine and Extreme Genome Research Center Program, funded by the MLTM (to K.K.K., S.G.K., S.-J.K., and J.-H.L.), by the 21C Frontier Program of Microbial Genomics and Applications (to J.-C.C.), and by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the MEST (to H.-M.O., 2009-0069493).

FOOTNOTES

    • Received 30 March 2010.
    • Accepted 1 April 2010.
  • Copyright © 2010 American Society for Microbiology

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Complete Genome Sequence of “Candidatus Puniceispirillum marinum” IMCC1322, a Representative of the SAR116 Clade in the Alphaproteobacteria
Hyun-Myung Oh, Kae Kyoung Kwon, Ilnam Kang, Sung Gyun Kang, Jung-Hyun Lee, Sang-Jin Kim, Jang-Cheon Cho
Journal of Bacteriology May 2010, 192 (12) 3240-3241; DOI: 10.1128/JB.00347-10

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Complete Genome Sequence of “Candidatus Puniceispirillum marinum” IMCC1322, a Representative of the SAR116 Clade in the Alphaproteobacteria
Hyun-Myung Oh, Kae Kyoung Kwon, Ilnam Kang, Sung Gyun Kang, Jung-Hyun Lee, Sang-Jin Kim, Jang-Cheon Cho
Journal of Bacteriology May 2010, 192 (12) 3240-3241; DOI: 10.1128/JB.00347-10
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KEYWORDS

Alphaproteobacteria
Genome, Bacterial

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