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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo

Volume 64, Issue Pt_11

sp. nov. and sp. nov. of hyperthermophilic heterotrophs from deep-sea hydrothermal vents Free

Abstract

Two heterotrophic hyperthermophilic strains, ES1 and CL1, were isolated from sp. polychaete worms collected from active hydrothermal vent chimneys in the north-eastern Pacific Ocean. Both were obligately anaerobic and produced HS in the presence of elemental sulfur and H. Complete genome sequences are available for both strains. Phylogenetic analyses based on 16S rRNA gene sequences showed that the strains are more than 97 % similar to most other species of the genus . Therefore, overall genome relatedness index analyses were performed to establish that these strains are novel species. For each analysis, strain ES1 was determined to be most similar to MP, while strain CL1 was determined to be most similar to 4557. The average nucleotide identity scores for these strains were 84 % for strain ES1 and 81 % for strain CL1, genome-to-genome direct comparison scores were 23 % for strain ES1 and 47 % for strain CL1, and the species identification scores were 89 % for strain ES1 and 88 % for strain CL1. For each analysis, strains ES1 and CL1 were below the species delineation cut-off. Therefore, based on their whole genome sequences, strains ES1 and CL1 are suggested to represent novel species of the genus for which the names sp. nov. and sp. nov. are proposed, respectively. The type strains are ES1 ( = DSM 27261 = KACC 17923) and CL1 ( = DSM 27260 = KACC 17922).

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Funding
This study was supported by the:
  • North-east Sun Grant Institute of Excellence (Award NE11-26)
  • USDA CSREES (Award MAS00431)
© 2014 IUMS
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2014-11-01
2024-04-20
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Thermococcus paralvinellae sp. nov. and Thermococcus cleftensis sp. nov. of hyperthermophilic heterotrophs from deep-sea hydrothermal vents
Int J Syst Evol Microbiol 64, 3655 (2014); https://doi.org/10.1099/ijs.0.066100-0
/content/journal/ijsem/10.1099/ijs.0.066100-0
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