Shewanella youngdeokensis sp. nov. Isolated from Marine Sediment and Sea Water of East Sea in Republic of Korea

The strain DAU334^T, 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 DAU334^T had the highest degree of similarity to several strains of Shewanella species, i.e., S. schlegeliana HRKA1^T (99%), S. halifaxensis HAE-EB4^T (99%), S. pneumatophori SCRC-2738^T (99%), S. sairae SM2-1^T (99%), and S. marinintestina IK-1^T (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 DAU334^T 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 DAU334^T were iso-C_13:0 and Summed feature 3 (C_{16:1 w7c} and/or C_{16:1 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 DAU334^T belongs to a novel species within the genus Shewanella, for which the name Shewanella youngdeokensis sp. nov. (type strain DAU334^T = KCTC 72428^T = JCM 35745^T = KCCM 43479^T) is proposed.