Abstract

The strain DAU334T, which was obtained from samples of sea water and sediments collected from the East Sea in the Republic of Korea, is a rod-shaped, Gram-stain-negative bacterium. It is facultative and positive for the oxidase and catalase enzymes. Based on the analysis of 16S rRNA sequences, it was determined that strain DAU334T had the highest degree of similarity to several strains of Shewanella species, i.e., S. schlegeliana HRKA1T (99%), S. halifaxensis HAE-EB4T (99%), S. pneumatophori SCRC-2738T (99%), S. sairae SM2-1T (99%), and S. marinintestina IK-1T (1419/1440, 99%), respectively. The complete genome sequence consisted of one contig with 4 343 646 bp, and the genome G+C content was 43.12%. The average nucleotide identity (ANI), digital DNA-DNA hybridization (dDDH), and average amino acid identity (AAI) between strain DAU334T and its closest relatives were 77.85‒71.10, 82.14‒67.07, and 22.60‒19.70%, respectively. The major fatty acids (>10%) of strain DAU334T were iso-C13:0 and Summed feature 3 (C16:1 w7c and/or C16:1 w6c). The respiratory quinones were ubiquinone 7 (Q7), ubiquinone 8 (Q8), menaquinone 7 (MK-7), menaquinone 8 (MK-8), methylated menaquinone 7 (MMK-7), and an unidentified one. According to the results of polyphasic analyses, the strain DAU334T belongs to a novel species within the genus Shewanella, for which the name Shewanellayoungdeokensis sp. nov. (type strain DAU334T = KCTC 72428T = JCM 35745T = KCCM 43479T) is proposed.

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