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Paradesulfovibrio onnuriensis gen. nov., sp. nov., a chemolithoautotrophic sulfate-reducing bacterium isolated from the Onnuri vent field of the Indian Ocean and reclassification of Desulfovibrio senegalensis as Paradesulfovibrio senegalensis comb. nov.
Yun Jae Kim 1,2, Jhung-Ahn Yang 1, Jae Kyu Lim 1,2, Mi-Jeong Park 1,2, Sung-Hyun Yang 1, Hyun Sook Lee 1,2, Sung Gyun Kang 1,2, Jung-Hyun Lee 1,2, Kae Kyoung Kwon 1,2
Journal of Microbiology 2020;58(4):252-259.
DOI: https://doi.org/10.1007/s12275-020-9376-0
Published online: February 27, 2020
1Korea Institute of Ocean Science and Technology, Busan 49111, Republic of Korea, 2KIOST School, University of Science and Technology, Daejeon 34113, Republic of Korea
Corresponding author:  Kae Kyoung Kwon , Tel: +82-51-664-3371, 
Received: 5 August 2019   • Revised: 31 October 2019   • Accepted: 21 January 2020
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Abstract

An anaerobic, rod-shaped, mesophilic, chemolithoautotrophic, sulfate-reducing bacterial strain IOR2T was isolated from a newly found deep-sea hydrothermal vent (OVF, Onnuri Vent Field) area in the central Indian Ocean ridge (11°24􍿁88􍿂􀁇 S 66°25􍿁42􍿂􀁇E, 2021 m water depth). The 16S rRNA gene sequence analysis revealed that the strain IOR2T was most closely related to Desulfovibrio senegalensis BLaC1T (96.7%). However, it showed low similarity with the members of the family Desulfovibrionaceae, such as Desulfovibrio tunisiensis RB22T (94.0%), D. brasiliensis LVform1T (93.9%), D. halophilus DSM 5663T (93.7%), and Pseudodesulfovibrio aespoeensis Aspo-2T (93.2%). The strain IOR2T could grow at 23– 42°C (optimum 37°C), pH 5.0–8.0 (optimum pH 7.0) and with 0.5–6.5% (optimum 3.0%) NaCl. The strain could use lactate, pyruvate, H2, and glycerol as electron donors and sulfate, thiosulfate, and sulfite as electron acceptors. The major fatty acids of the strain IOR2T were iso-C15:0, iso-C17:0, anteiso- C15:0, and summed feature 9 (C16:0 methyl/iso-C17:1ω9c). Both the strains IOR2T and BLaC1T could grow with CO2 and H2 as the sole sources of carbon and energy, respectively. Genomic evidence for the Wood-Ljungdahl pathway in both the strains reflects chemolithoautotrophic growth. The DNA G + C content of the strain IOR2T and BLaC1T was 58.1–60.5 mol%. Based on the results of the phylogenetic and physiologic studies, Paradesulfovibrio onnuriensis gen. nov., sp. nov. with the type strain IOR2T (= KCTC 15845T = MCCC 1K04559T) was proposed to be a member of the family Desulfovibrionaceae. We have also proposed the reclassification of D. senegalensis as Paradesulfovibrio senegalensis comb. nov.

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    Paradesulfovibrio onnuriensis gen. nov., sp. nov., a chemolithoautotrophic sulfate-reducing bacterium isolated from the Onnuri vent field of the Indian Ocean and reclassification of Desulfovibrio senegalensis as Paradesulfovibrio senegalensis comb. nov.
    J. Microbiol. 2020;58(4):252-259.   Published online February 27, 2020
    DOI: https://doi.org/10.1007/s12275-020-9376-0
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