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Identification and genomic analysis of Pseudosulfitobacter koreense sp. nov. isolated from toxin-producing dinoflagellate Alexandrium pacificum

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Abstract

The bacterial strain AP-MA-4T isolated from the marine dinoflagellate Alexandrium pacificum (KCTC AG60911), was subjected to a taxonomic analysis. Cells of strain AP-MA-4T were Gram-stain-negative, aerobic, rod-shaped, optimum growth at 20 °C, pH 7.0, in the presence of 5% (w/v) NaCl. Strain AP-MA-4T shared the highest 16S rRNA gene sequence similarity to Pseudosulfitobacter pseudonitzschiae DSM 26824T (98.5%), followed by Ascidiaceihabitans donghaensis RSS1-M3T (96.3%), Pseudoseohaeicola caenipelagi BS-W13T (95.7%), and Sulfitobacter pontiacus CHLG 10T (95.3%). Based on 16S rRNA phylogeny, strain AP-MA-4T is phylogenetically closely related to Pseudosulfitobacter pseudonitzschiae (type species of Pseudosulfitobacter) and could be distinguished from the type species based on their phenotypic properties. The genome length of strain AP-MA-4T was 3.48 Mbp with a 62.9% G + C content. The average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between strain AP-MA-4 T and its closely related type strains were 72.2–83.3 and 18.2–27.6%, respectively. Summed feature 8 (C18:1ω7c and/or C18:1ω6c) was identified the major fatty acids (> 10%). Phosphatidylglycerol (PG), phosphatidylethanolamine (PE), and phospholipid (PL) were demonstrated as the major polar lipids. The major respiratory quinone is ubiquinone-10 (Q-10). Based on genotypic and phenotypic features, strain AP-MA-4T (= KCTC 92289T = GDMCC 1.3585T) represents a new Pseudosulfitobacter species, in which the name Pseudosulfitobacter koreense sp. nov. is proposed.

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Data availability

The GenBank accession numbers of the 16S rRNA gene and the genome sequences of the strain AP-MA-4T are ON979826 and JANKJG000000000, respectively. This strain can be obtained from the Korea Collection for Type Cultures (KCTC 92289T) and the Guangdong Microbial Culture Collection Center (GDMCC 1.3585T).

Abbreviations

ANI:

Average nucleotide identity

dDDH:

Digital DNA-DNA hybridization

GGDC:

Genome-to-genome distance calculation

LBA:

Luria–Bertani agar

R2A:

Reasoner’s 2A agar

MA:

Marine agar 2216

TSA:

Tryptic soy agar

PDA:

Potato dextrose agar

NA:

Nutrient agar

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Funding

This work was supported by grant from the Korea Research Institute of Bioscience and Biotechnology (KRIBB) Research Initiative Program (KGM5232322) and by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2021R1C1C1008377).

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JY and ZL wrote the main manuscript text and JY prepared Figs. 1, 2. All authors reviewed the manuscript.

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Correspondence to Zhun Li.

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The authors declare that there are no conflicts of interest.

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Communicated by Wen-Jun Li.

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Jiang, Y., Li, Z. Identification and genomic analysis of Pseudosulfitobacter koreense sp. nov. isolated from toxin-producing dinoflagellate Alexandrium pacificum. Arch Microbiol 205, 245 (2023). https://doi.org/10.1007/s00203-023-03583-z

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  • DOI: https://doi.org/10.1007/s00203-023-03583-z

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