Hahella aquimaris sp. nov., a bacterium producing prodigiosin isolated from aquaculture seawater

A Gram-staining-negative, aerobic, red-pigmented, motile with a single polar flagellum and rod-shaped bacterium, designated HNIBRBA332^T, was isolated from an aquaculture seawater sample. Phylogenetic analysis based 16S rRNA gene sequences revealed that strain HNIBRBA332^T belonged to the genus Hahella of the family Hahellaceae and shared 95.3-99.9% sequence similarities with Hahella species. Whole genome sequencing of strain HNIBRBA332^T revealed the genome size of 7.2Mbp and the G+C content of 59.5%. The HNIBRBA332^T genome shared 89.0% of average nucleotide identity and 36.6% of digital DNA-DNA hybridization values to the genome of Hahella chejuensis KCTC 2396^T, the type species of the genus. Genes involved in prodigiosin biosynthesis were identified in the genome. The strain contained C_17:0 10-methly, summed feature 3 (C_16:1 ω7c and/or C_16:1 ω6c), C_18:1 ω9c and C_20:4 ω6,9,12,15c as the major fatty acids and menaquinone-7 as the major respiratory quinone. The major polar lipids were phosphatidylglycerol, phosphatidylethanolamine, and two unidentified aminolipids. On the basis of phylogenetic and phenotypic characteristics, strain HNIBRBA332^T is considered to represent a novel species of the genus Hahella, for which the name Hahella aquimaris (type strain HNIBRBA332^T) sp. nov., is proposed.