Wenyingzhuangia aestuarii sp. nov., A Marine Bacterium of the Family Flavobacteriaceae Isolated from an Estuary


A Gram-negative, strictly aerobic, chemoheterotrophic, pale-yellow pigmented, non-motile, rod-shaped bacterial strain, designated MN1-138T, was isolated from water in the tidal zone at the estuary of Heita river, Iwate, Japan, using an in situ cultivation technique. Preliminary analysis based on the 16S rRNA gene sequence revealed that the novel isolate is affiliated with the family Flavobacteriaceae of the phylum Bacteroidetes, and the highest sequence similarities were found with the species Wenyingzhuangia heitensis H-MN17T (97.3 %). The DNA–DNA relatedness between values between strains MN1-138T and W. heitensis H-MN17T was 34 %. The DNA G+C content of strain MN1-138T was determined to be 33.1 mol%; MK-6 was identified as the major menaquinone; and the presence of iso-C15:0, iso-C15:0 3-OH, and iso-C17:0 3-OH as the major (>10 %) cellular fatty acids. A polar lipid profile was present consisting of phosphatidylethanolamine, two unidentified glycolipids, and two unidentified lipids. From the distinct phylogenetic position and combination of genotypic and phenotypic characteristics, the strain is considered to represent a novel species of the genus Wenyingzhuangia for which the name Wenyingzhuangia aestuarii sp. nov. is proposed. The type strain of W. aestuarii sp. nov. is MN1-138T (=KCTC 42780T = NBRC 111505T).

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We are grateful to Midori Nozawa for her technical assistance. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO), and in part by a research grant (2009–2011) of the Institute for Fermentation, Osaka, Japan.

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Correspondence to Jaewoo Yoon.

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Supplementary Fig. 1

Transmission electron micrograph of a negatively stained cell of strain MN1-138T. Bar, 500 nm. Supplementary material 1 (PPTX 582 kb)

Supplementary Fig. 2

Thin-layer chromatograms showing the total polar lipid compositions of MN1-138T. Total polar lipids were detected by spraying the plate with molybdophosphoric acid, molybdenum blue, α-naphthol, and ninhydrin. PE: phosphatidylenthanolamine, UL: unidentified lipid, UGL: unidentified glycolipid. Supplementary material 2 (PPTX 930 kb)

Supplementary Fig. 3

Negative results from the API 20E, API 50CH, and API ZYM strips. Supplementary material 3 (PPTX 44 kb)

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Yoon, J., Kasai, H. Wenyingzhuangia aestuarii sp. nov., A Marine Bacterium of the Family Flavobacteriaceae Isolated from an Estuary. Curr Microbiol 72, 397–403 (2016). https://doi.org/10.1007/s00284-015-0965-9

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  • Bacteroidetes
  • Marine Agar
  • gyrB Gene
  • Unidentified Lipid
  • Unidentified Glycolipid