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  • Title: Aequorivita iocasae sp. nov., a halophilic bacterium isolated from sediment collected at a cold seep field in the South China Sea.
    Author: Zhang H, Wang H, Cao L, Chen H, Zhong Z, Wang M, Lian C, Liu R, Zhou L, Li C.
    Journal: Int J Syst Evol Microbiol; 2022 Feb; 72(2):. PubMed ID: 35133258.
    Abstract:
    A moderately halophilic bacterium, designated strain KX20305T, was isolated from sediment collected from a cold seep field in the South China Sea. Cells of strain KX20305T were Gram-stain-negative, rod-shaped, non-motile, facultatively anaerobic, oxidase- and catalase-positive, and grew optimally at 25-30 °C, pH 6.0-8.0 and with 3-6 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain KX20305T grouped with members of the genus Aequorivita, including Aequorivita aquimaris D-24T (98.3 % sequence similarity), Aequorivita vladivostokensis KMM 3516T (98.1 %) and Aequorivita echinoideorum CC-CZW007T (97.5 %). Genome sequencing of strain KX20305T revealed a genome size of 3.35 Mb and a DNA G+C content of 38.71 mol%. Genomic average nucleotide identity (orthoANI) values of strain KX20305T with A. aquimaris D-24T, A. vladivostokensis KMM 3516T and A. echinoideorum JCM 30378T were 83.8, 81.7 and 75.4 %, respectively, while in silico DNA-DNA hybridization (GGDC) values for strain KX20305T with these strains were 27.2, 25.0 and 19.6 %, respectively. The major fatty acids of strain KX20305T were iso-C15 : 0, iso-C17 : 0 3-OH and 10-methyl C16 : 0/iso-C17 : 1  ω9c. The predominant respiratory quinone was menaquinone-6 (MK-6). The polar lipids mainly comprised phosphatidylethanolamine, two unidentified aminolipids and two unidentified lipids. Based on comparative analysis of phylogenetic, phylogenomic, phenotypic and chemotaxonomic characteristics, strain KX20305T represents a novel species of the genus Aequorivita, for which the name Aequorivita iocasae sp. nov. is proposed. The type strain is KX20305T (=KCTC 82699T=MCCC 1K06238T=JCM 34635T).
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