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Chitinophaga caseinilytica sp. nov., a casein hydrolysing bacterium isolated from forest soil

Archives of Microbiology volume 200, pages 645–651 (2018)Cite this article

Abstract

A novel casein hydrolysing bacterium designated strain S-52T was isolated from Kyonggi University forest soil. Cells were strictly aerobic, Gram stain-negative, oxidase- and catalase- positive, non-motile, non-spore-forming, rod-shaped, and golden-yellow-pigmented. Strain S-52T hydrolysed casein. It was able to grow at 20–37 °C (optimum 25–32 °C), pH 6.5–11.0 (optimum 7–9.5), and at 3% (w/v) NaCl concentration. Strain exhibits flexirubin-type pigments. Phylogenetic analysis based on 16S rRNA gene sequence revealed that strain S-52T formed a lineage within the genus Chitinophaga that was distinct from other species of the genus. Closest member was Chitinophaga barathri YLT18T (97.16% 16 S rRNA gene sequence similarity). The major cellular fatty acids were iso-C15:0, C16:1ω5c, iso-C17:0 3-OH, and summed feature 3 (C16:1ω7c and/or C16: 1ω6c). MK-7 was sole respiratory quinone. The major polar lipid was phosphatidylethanolamine. The DNA G + C content of strain S-52T was 48.8 mol%. DNA–DNA relatedness of strain S-52T with Chitinophaga barathri was 42.5%. On the basis of phenotypic, genotypic, phylogenetic, and chemotaxonomic characterization, S-52T represents a novel species in the genus Chitinophaga, for which the name Chitinophaga caseinilytica sp. nov. is proposed. The type strain is S-52T (= KEMB 9005-540T = KACC 19118T = NBRC 112679T).

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Funding

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2016R1D1A1A09916982).

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Authors and Affiliations

  1. Department of Life Science, College of Natural Sciences, Kyonggi University, Suwon, Gyeonggi-Do, 16227, South Korea

    Ram Hari Dahal & Jaisoo Kim

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  1. Ram Hari Dahal
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  2. Jaisoo Kim
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Correspondence to Jaisoo Kim.

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Communicated by Erko Stackebrandt.

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Dahal, R.H., Kim, J. Chitinophaga caseinilytica sp. nov., a casein hydrolysing bacterium isolated from forest soil. Arch Microbiol 200, 645–651 (2018). https://doi.org/10.1007/s00203-018-1473-7

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Keywords

  • Chitinophaga caseinilytica sp. nov.
  • Chitinophagaceae
  • Forest soil
  • Casein hydrolysis
  • Strictly aerobic
  • Golden-yellow pigmented