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Abstract

A polyphasic study was conducted to characterize an obligately anaerobic bacterial strain, S15, that was isolated from Okinawa Trough sediment. Strain S15 was Gram-stain-negative, non-motile and rod-shaped. Spores were not observed. Strain S15 grew anaerobically at 20–35 °C (optimum at 25–30 °C) and at pH range of 6.0–8.5 (optimum at 7.5). Analysis of 16S rRNA gene sequences showed that strain S15 was phylogenetically related to Vallitalea guaymasensis Ra1766G1 (94.0 %) and Vallitalea pronyensis FatNI3 (93.1 %). The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and glycolipids. The predominant fatty acids of strain S15 were iso-C15 : 0, anteiso-C15 : 0, iso-C16 : 0 and C16 : 0. The draft genome was 5.86 Mb with a DNA G+C content of 33.9 mol%. A total of 5285 genes were predicted and, of those, 4669 genes were annotated. The genome data supported the result that strain S15 assimilated various carbon sources. On the basis of unique phenotypic, chemotaxonomic and phylogenetic comparisons, strain S15 is proposed to represent a novel species within the genus Vallitalea , and the name Vallitalea okinawensis sp. nov. is proposed. The type strain is S15=CGMCC 1.5231=KCTC 15675.

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2018-12-12
2020-01-23
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