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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 Korea1Korea 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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