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KMID : 0880220200580040260
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Journal of Microbiology
2020 Volume.58 No. 4 p.260 ~ p.267
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Thermococcus indicus sp. nov., a Fe(III)-reducing hyperthermophilic archaeon isolated from the Onnuri Vent Field of the Central Indian Ocean ridge
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Lim Jae-Kyu
Kim Yun-Jae
Yang Jhung-Ahn
Namirimu Teddy
Yang Sung-Hyun
Park Mi-Jeong
Kwon Yong-Min
Lee Hyun-Sook
Kang Sung-Gyun
Lee Jung-Hyun
Kwon Kae-Kyoung
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Abstract
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A strictly anaerobic, dissimilatory Fe(III)-reducing hyperthermophilic archaeon, designated as strain IOH1T, was isolated from a new deep-sea hydrothermal vent (Onnuri Vent Field) area in the Central Indian Ocean ridge. Strain IOH1T showed > 99% 16S rRNA gene sequence similarity with Thermococcus celericrescens TS2T (99.4%) and T. siculi DSM 12349T (99.2%). Additional three species T. barossii SHCK-94T (99.0%), T. celer Vu13T (98.8%), and T. piezophilus (98.6%) showed > 98.6% of 16S rRNA gene sequence similarity, however, the maximum OrthoANI value is 89.8% for the genome of T. celericrescens TS2T. Strain IOH1T cells are coccoid, 1.2?1.8 μm in diameter, and motile by flagella. Growth was at 70?82°C (optimum 80°C), pH 5.4?8.0 (optimum pH 6.0) with 2?4% (optimum 3%) NaCl. Growth of strain IOH1T was enhanced by starch, pyruvate, D(+)-maltose and maltodextrin as a carbon sources, and elemental sulfur as an electron acceptor; clearly different from those of related species T. celecrescens DSM 17994T and T. siculi DSM 12349T. Strain IOH1T, T. celercrescence DSM 17994T, and T. siculi DSM 12349T reduced soluble Fe(III)-citrate present in the medium, whereas the amount of total cellular proteins increased with the concomitant accumulation of Fe(II). We determined a circular chromosome of 2,234 kb with an extra-chromosomal archaeal plasmid, pTI1, of 7.7 kb and predicted 2,425 genes. The DNA G + C content was 54.9 mol%. Based on physiological properties, phylogenetic, and genome analysis, we proposed that strain IOH1T (= KCTC 15844T = JCM 39077T) is assigned to a new species in the genus Thermococcus and named Thermococcus indicus sp. nov.
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KEYWORD
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Thermococcus indicus sp. nov., Fe(III)-reduction, hyperthermophile, Indian Ocean, Onnuri Vent Field
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