1887

Abstract

A novel exopolysaccharide-producing strain, designated as 5.12, was isolated from a sediment sample from the Southwest Indian Ridge, Indian Ocean. The strain was Gram-stain-negative, motile, strictly aerobic, and oxidase- and catalase-positive. It grew optimally at 35 °C, at pH 6.0 and in the presence of 3.5 % (w/v) NaCl. Its major isoprenoid quinone was ubiquinone-8 (Q-8) and summed feature 3 (comprising Cω6 and/or Cω7), C and Cω7 were the major cellular fatty acids. The DNA G+C content was 46.1 mol%. 16S rRNA gene sequence analysis suggested that strain 5.12 is a member of the genus . Strain 5.12 exhibited close 16S rRNA gene sequence similarity to JW12 (96.1 %), F-32 (95.9 %), DSSK2-12 (95.9 %), TF-22 (95.6 %) and DE (95.5 %). Strain 5.12 contained phosphatidylethanolamine and phosphatidylglycerol as the major polar lipids. Owing to significant differences in the 16S rRNA gene sequences, as well as the phenotypic and chemotaxonomic characteristics, the novel isolate described here merits classification as a representative of a novel species of the genus , for which the name sp. nov. is proposed. The type strain of this species is 5.12 (LMG 29661= MCC 3250).

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2017-10-01
2024-03-29
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