- Isolation and genome analysis of Winogradskyella algicola sp. nov., the dominant bacterial species associated with the green alga Dunaliella tertiolecta
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Jaeho Song , Yeonjung Lim , Hye-Jin Jang , Yochan Joung , Ilnam Kang , Seong-Joo Hong , Choul-Gyun Lee , Jang-Cheon Cho
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J. Microbiol. 2019;57(11):982-990. Published online October 28, 2019
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DOI: https://doi.org/10.1007/s12275-019-9378-y
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Microalgae and bacteria are known to be closely associated in
diverse environments. To isolate dominant bacterial species
associated with a green alga, Dunaliella tertiolecta, a photoreactor
culture of the microalga was investigated using culture-
based and culture-independent approaches. The bacterial
community structure of the algal culture showed that
the most abundant bacterial species under the culture conditions
was related to the genus Winogradskyella. The closely
related amplicon sequences, showing ≥ 99.5% 16S rRNA gene
sequence similarity to one of the isolates, designated IMCC-
33238T, constituted > 49% of the bacterial community and
was therefore regarded as the most dominant species in the
algal culture. Strain IMCC33238T was characterized by Gramstaining-
negative and orange-colored rods. Phylogenetic analyses
of the 16S rRNA genes as well as whole genome sequences
revealed that strain IMCC33238T belonged to Winogradskyella
and shared more than 97.2% 16S rRNA gene sequence
similarity with Winogradskyella species. The strain
contained iso-C15:1 G, iso-C15:0, iso-C15:0 3-OH, and summed
feature 3 (C16:1 ω6c and/or C16:1 ω7c) as major fatty acids and
MK-6 as the predominant quinone. The polar lipids found
in strain IMCC33238T were phosphatidylethanolamine, two
unidentified aminolipids, and three unidentified lipids. The
genome of strain IMCC33238T was 3.37 Mbp in size with
33.9 mol% G + C content and proteorhodopsin. Many genes
encoding folate and vitamin production are considered to play
an important role in the bacteria-algae interaction. On the
basis of phylogenetic and phenotypic characteristics, strain
IMCC33238T represents a novel species in the genus Winogradskyella,
for which the name Winogradskyella algicola sp.
nov. is proposed. The type strain is IMCC33238T (= KACC
21192T = NBRC 113704T).
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Citations
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Yang Liu, Kai Liao, Yang Zhang, Qi Hu, Xiaoxue He, Fengjun Xie, Lin Zhang, Zhongming Huo, Jilin Xu
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International Journal of Systematic and Evolutionary Microbiology
.2023;[Epub] CrossRef - List of new names and new combinations previously effectively, but not validly, published
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International Journal of Systematic and Evolutionary Microbiology
.2020; 70(7): 4043. CrossRef - Taxonomic study of nine new Winogradskyella species occurring in the shallow waters of Helgoland Roads, North Sea. Proposal of Winogradskyella schleiferi sp. nov., Winogradskyella costae sp. nov., Winogradskyella helgolandensis sp. nov., Winogradskyella v
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Systematic and Applied Microbiology.2020; 43(6): 126128. CrossRef
- Sulfitobacter profundi sp. nov., isolated from deep seawater
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Jaeho Song , Hye-Jin Jang , Yochan Joung , Ilnam Kang , Jang-Cheon Cho
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J. Microbiol. 2019;57(8):661-667. Published online April 22, 2019
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DOI: https://doi.org/10.1007/s12275-019-9150-3
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A Gram-stain-negative, rod-shaped, obligately aerobic, chemoheterotrophic
bacterium which is motile by means of a
single polar flagellum, designated SAORIC-263T, was isolated
from deep seawater of the Pacific Ocean. Phylogenetic
analyses based on 16S rRNA gene sequences and genomebased
phylogeny revealed that strain SAORIC-263T belonged
to the genus Sulfitobacter and shared 96.1–99.9% 16S rRNA
gene sequence similarities with Sulfitobacter species. Wholegenome
sequencing of strain SAORIC-263T revealed a genome
size of 3.9Mbp and DNA G+C content of 61.3 mol%.
The SAORIC-263T genome shared an average nucleotide identity
and digital DNA-DNA hybridization of 79.1–88.5% and
18.9–35.0%, respectively, with other Sulfitobacter genomes.
The SAORIC-263T genome contained the genes related to
benzoate degradation, which are frequently found in deep-sea
metagenome. The strain contained summed feature 8 (C18:1
ω7c), C18:1 ω7c 11-methyl, and C16:0 as the predominant cellular
fatty acids as well as ubiquinone-10 (Q-10) as the major
respiratory quinone. The major polar lipids of the strain
were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol,
phosphatidylcholine, and aminolipid.
On the basis of taxonomic data obtained in this study, it is
suggested that strain SAORIC-263T represents a novel species
of the genus Sulfitobacter, for which the name Sulfitobacter
profundi sp. nov. is proposed. The type strain is SAORIC-263T
(= KACC 21183T = NBRC 113428T).
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- Flavobacterium aquariorum sp. nov., isolated from freshwater of the North Han River
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Yochan Joung , Hye-Jin Jang , Jaeho Song , Jang-Cheon Cho
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J. Microbiol. 2019;57(5):343-349. Published online February 5, 2019
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DOI: https://doi.org/10.1007/s12275-019-8436-9
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1,005
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A non-motile, yellow-pigmented bacterial strain, designated
IMCC34762T, was isolated from a freshwater sample collected
from Lake Cheongpyeong in Korea. Phylogenetic analysis
based on 16S rRNA gene sequences showed that strain IMCC-
34762T formed a lineage within the genus Flavobacterium
and was most closely related to F. pectinovorum DSM 6368T
(98.3% sequence similarity), followed by F. piscis CCUG
60099T (98.3%), F. branchiicola 59B-3-09T (98.2%), and F.
saccharophilum DSM 1811T (98.2%). The average nucleotide
identity and the genome-to-genome distance between strain
IMCC34762T and the closely related strains were 61–62%
and 26–27%, respectively, indicating that IMCC34762T is a
novel species of the genus Flavobacterium. The major fatty
acids (> 5%) of strain IMCC34762T were summed feature 3
(C16:1 ω6c and/or C16:1 ω7c, 17.3%), iso-C15:0 (15.0%), iso-C15:0
G (9.0%), C15:0 ω6c (7.4%), iso-C15:0 (7.4%), and iso-C16:0 (5.3%).
The major respiratory quinone and polyamine were MK-6 and
sym-homospermidine, respectively. The major polar lipids
were phosphatidylethanolamine, an unidentified aminophospholipid,
and an unidentified lipid. The DNA G+C content
of strain IMCC34762T was 34.4 mol%. Based on the taxonomic
data presented in this study, strain IMCC34762T represents
a novel species within the genus Flavobacterium, for which
the name Flavobacterium aquariorum, sp. nov. is proposed.
The type strain is IMCC34762T (= KACC 19725T = NBRC
113425T).
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International Journal of Systematic and Evolutionary Microbiology
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Yochan Joung , Hye-jin Jang , Miri Park , Jaeho Song , Jang-Cheon Cho
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J. Microbiol. 2018;56(7):478-484. Published online June 14, 2018
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DOI: https://doi.org/10.1007/s12275-018-7499-3
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1,082
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A non-motile, pink-pigmented bacterial strain designated
IMCC25679T, was isolated from freshwater Lake Chungju of
Korea. Phylogenetic trees based on 16S rRNA gene sequences
showed that the strain IMCC25679T formed a lineage within
the genus Pedobacter. The strain IMCC25679T was closely
related to Pedobacter daechungensis Dae 13T (96.4% sequence
similarity), Pedobacter rivuli HME8457T (95.3%) and Pedobacter
lentus DS-40T (94.3%). The major fatty acids of IMCC-
25679T were iso-C15:0, iso-C16:0 and summed feature 3 (comprising
C16:1 ω6c and/or C16:1 ω7c). The major respiratory quinone
was MK-7. The major polar lipids were phosphatidylethanolamine
(PE), an unidentified sphingolipid (SL), an
unidentified aminolipid (AL) and three unidentified polar
lipids (PL). The DNA G + C content of IMCC25679T was 32.2
mol%. Based on the evidence presented in this study, the
strain IMCC25679T represents a novel species within the genus
Pedobacter, with the proposed name Pedobacter aquicola,
sp. nov. The type strain is IMCC25679T (= KACC 19486T
= NBRC113131T).
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.2019; 69(10): 3135. CrossRef
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