Abstract
BackgroundExtremophiles have attracted much attention in the last few decades, as they possess different properties by producing certain useful metabolites. However, the secondary metabolism of the extremophiles of Antarctic krill has received little attention.ResultsIn this study, a new bacterial strain MSAK28401T from Antarctic krill was isolated and identified. The results of analysis on phenotypic, chemotaxonomic, and genomic characteristics showed that the strain MSAK28401T belongs to the genus Planococcus. Cells of this strain were coccoid (0.89–1.05 μm) and aerobic. The majority of the fatty acid content was C15:0 anteiso (37.67 ± 0.90%) followed by C16:1 ω7c alcohol (10.37 ± 1.22%) and C16:0 iso (9.36 ± 0.71%). The calculated average nucleotide identity and DNA–DNA hybridization values between the strain MSAK28401T and type strains P. citreus DSM 20549T and P. rifietoensis M8T were lower than 91 and 70%, respectively. The strain MSAK28401T (=KCTC 43283T and MCCC 1k05448T) represented a new member of the genus Planococcus and was named P. alpniumensis sp. nov. Moreover, genes involved in the degradation of aromatic compounds (e.g., salicylate, gentisate, and quinate) were found in the genome, implying that strain MSAK28401T has an aromatic compound as its potential metabolite. This work will help us understand the genomic characteristics and potential metabolic pathway of Planococcus from Antarctic krill.ConclusionsThis study reported the genomic information and phenotypic characteristics of the new strain P. alpniumensis MSAK28401T isolated from Antarctic krill, and provided the genome information of Planococcus strains for further studying the function roles in aromatic compound metabolism.
Highlights
Extremophiles have attracted much attention in the last few decades, as they possess different properties by producing certain useful metabolites
Representative strains of genus Planococcus usually grow in cold and/or saline-alkali soil with high salt concentrations, e.g., Arctic, Antarctic, and marine environments [9,10,11]
The 16S rRNA sequence alignment against GenBank revealed that the strain M SAK28401T belonged to the genus Planococcus, and it showed 98.62, 98.55, 98.43, 98.20, and 97.79% similarity with the corresponding gene sequences of P. citreus DSM20549T, P. rifietornsis M8T, P. maitriensis S1T, P. dechangensis NEAU-ST109T, and P. maritimus DSM17275T, respectively
Summary
Extremophiles have attracted much attention in the last few decades, as they possess different properties by producing certain useful metabolites. The genera Planococcus was initially found and proposed by Migula and has been continuously revised [1]. It was classified as Planococcaceae of Firmicutes, and 30 species had been published to date. Representative strains of genus Planococcus usually grow in cold and/or saline-alkali soil with high salt concentrations, e.g., Arctic, Antarctic, and marine environments [9,10,11]. Planococcus has attracted much attention, because they can produce carotenoids of biotechnological significance; this metabolite has potential applications as the ingredient of cosmetics, food or feed additives, and antioxidants [12]. Planococcus can degrade and process various contaminants, such as heavy metals and phenols, and play an important role in the bioremediation of extreme environments [13, 14]
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