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Abstract

A Gram-stain-negative, strictly aerobic, oval-shaped, non-motile bacterium with no flagella, designated strain SCR17, was isolated from a shrimp gill habitat in Tangyin hydrothermal field of Okinawa Trough. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain SCR17 formed a lineage within the family ‘’, and shared 16S rRNA gene sequence similarity of 93.2–96.2 % to the related genera and . Strain SCR17 was able to grow with 0–14 % (w/v) NaCl (optimum, 9–10 %). The sole respiratory quinone was ubiquinone-10. The major polar lipids of strain SCR17 comprised phosphatidylcholine (PC), phosphatidylglycerol (PG), phosphatidylethanolamine (PE), an unidentified aminolipid (AL), an unidentified phospholipid (PL) and an unidentified lipid (L). The predominant fatty acids (more than 10 % of the total fatty acids) were Cω7 or/and Cω6, anteiso-C, C and C cyclo 8 . The genomic DNA G+C content of strain SCR17 was 67.7 mol%. Based on polyphasic taxonomic analyses, strain SCR17 is considered to represent a novel species in a new genus of the family ‘’, for which the name gen. nov., sp. nov. is proposed. The type strain of is SCR17 (=JCM 33426=MCCC 1K03732). The discovery of a novel host-associated bacterium in hydrothermal fields provides an opportunity for the study of host–bacterial symbiosis in extreme environments.

Funding
This study was supported by the:
  • Scientific and Technological Innovation Project of Qingdao National Laboratory for Marine Science and Technology (Award 2016ASKJ14)
    • Principle Award Recipient: Xiao-Hua Zhang
  • The Youth Talent Support Program of the Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Award LMEES-YTSP-2018-02-07)
    • Principle Award Recipient: Min Yu
  • National Natural Science Foundation of China (Award U1706208 and 41976137)
  • National Key R&D Program of China (Award 2018YFC0310701)
    • Principle Award Recipient: Min Yu
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2020-01-16
2024-04-25
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