Archives of Microbiology

, Volume 199, Issue 2, pp 335–346 | Cite as

Mariprofundus micogutta sp. nov., a novel iron-oxidizing zetaproteobacterium isolated from a deep-sea hydrothermal field at the Bayonnaise knoll of the Izu-Ogasawara arc, and a description of Mariprofundales ord. nov. and Zetaproteobacteria classis nov.

  • Hiroko MakitaEmail author
  • Emiko Tanaka
  • Satoshi Mitsunobu
  • Masayuki Miyazaki
  • Takuro Nunoura
  • Katsuyuki Uematsu
  • Yoshihiro Takaki
  • Shinro Nishi
  • Shigeru Shimamura
  • Ken Takai
Original Paper


A novel iron-oxidizing chemolithoautotrophic bacterium, strain ET2T, was isolated from a deep-sea sediment in a hydrothermal field of the Bayonnaise knoll of the Izu-Ogasawara arc. Cells were bean-shaped, curved short rods. Growth was observed at a temperature range of 15–30 °C (optimum 25 °C, doubling time 24 h) and a pH range of 5.8–7.0 (optimum pH 6.4) in the presence of NaCl at a range of 1.0–4.0 % (optimum 2.75 %). The isolate was a microaerophilic, strict chemolithoautotroph capable of growing using ferrous iron and molecular oxygen (O2) as the sole electron donor and acceptor, respectively; carbon dioxide as the sole carbon source; and either ammonium or nitrate as the sole nitrogen source. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that the new isolate was related to the only previously isolated Mariprofundus species, M. ferrooxydans. Although relatively high 16S rRNA gene similarity (95 %) was found between the new isolate and M. ferrooxydans, the isolate was distinct in terms of cellular fatty acid composition, genomic DNA G+C content and cell morphology. Furthermore, genomic comparison between ET2T and M. ferrooxydans PV-1 indicated that the genomic dissimilarity of these strains met the standard for species-level differentiation. On the basis of its physiological and molecular characteristics, strain ET2T (= KCTC 15556T = JCM 30585 T) represents a novel species of Mariprofundus, for which the name Mariprofundus micogutta is proposed. We also propose the subordinate taxa Mariprofundales ord. nov. and Zetaproteobacteria classis nov. in the phylum Proteobacteria.


Zetaproteobacteria Mariprofundus sp. Iron-oxidizing bacteria Hydrothermal field Bayonnaise knoll 



We thank the captain and crew of the R/V Natsushima, the operation team of the ROV Hyper-Dolphin and chief scientist Dr. Motohiro Shimanaga (Kumamoto University) for their valuable help in obtaining deep-sea hydrothermal vent samples during cruise NT14-06. We also thank Mr. Akihiro Tame for his excellent assistance in preparing samples for electron microscopy. We are grateful to Dr. Chong Chen for his help in improving this manuscript. This work was partially supported by JSPS KAKENHI Grant Number JP26820389.

Supplementary material

203_2016_1307_MOESM1_ESM.docx (311 kb)
Supplementary material 1 (DOCX 311 kb)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Hiroko Makita
    • 1
    • 2
    Email author
  • Emiko Tanaka
    • 2
    • 1
  • Satoshi Mitsunobu
    • 3
  • Masayuki Miyazaki
    • 1
  • Takuro Nunoura
    • 1
  • Katsuyuki Uematsu
    • 4
  • Yoshihiro Takaki
    • 1
  • Shinro Nishi
    • 1
  • Shigeru Shimamura
    • 1
  • Ken Takai
    • 1
  1. 1.Japan Agency for Marine-Earth Science and Technology (JAMSTEC)YokosukaJapan
  2. 2.Department of Applied ChemistryKanagawa Institute of TechnologyAtsugi, KanagawaJapan
  3. 3.Department of Environmental Conservation, Graduate School of AgricultureEhime UniversityMatsuyamaJapan
  4. 4.Section 1 Geochemical Oceanography, Office of Marine Research Department of Marine ScienceMarine Works Japan Ltd.YokosukaJapan

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