Journal of Microbiology

Journal Articles

Environmental Adaptability and Roles in Ammonia Oxidation of Aerobic Ammonia-Oxidizing Microorganisms in the Surface Sediments of East China Sea: Wenhui Li, Yu Zhen, Yuhong Yang, Daling Wang, Hui He; J. Microbiol. 2024;62(10):845-858. Published online August 30, 2024; DOI: https://doi.org/10.1007/s12275-024-00166-5

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This study investigated the community characteristics and environmental influencing factors of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in the surface sediments of the East China Sea. The research found no consistent pattern in the richness and diversity of AOA and AOB with respect to the distance from the shore, indicating a complex interplay of factors. The expression levels of AOA amoA gene and AOB amoA gene in the surface sediments of the East China Sea ranged from 4.49 × 10² to 2.17 × 10⁶ copies per gram of sediment and from 6.6 × 10¹ to 7.65 × 10⁴ copies per gram of sediment, respectively. Salinity (31.77 to 34.53 PSU) and nitrate concentration (1.51 to 10.12 μmol/L) were identified as key environmental factors significantly affecting the AOA community, while salinity and temperature (13.71 to 19.50 °C) were crucial for the AOB community. The study also found that AOA, dominated by the Nitrosopumilaceae family, exhibited higher gene expression levels than AOB, suggesting a more significant role in ammonia oxidation. The expression of AOB was sensitive to multiple environmental factors, indicating a responsive role in nitrogen cycles and ecosystem health. The findings contribute to a better understanding of the biogeochemical processes and ecological roles of ammonia-oxidizing microorganisms in marine sediments.

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Metabolism diversification of ammonia-oxidizing archaea and bacteria under different precipitation gradients and land legacies
Soumyadev Sarkar, Anna Kazarina, Paige M. Hansen, Kaitlyn Ward, Christopher Hargreaves, Nicholas Reese, Qinghong Ran, Willow Kessler, Ligia F.T. de Souza, Terry D. Loecke, Marcos V.M. Sarto, Charles W. Rice, Lydia H. Zeglin, Benjamin A. Sikes, Sonny T.M.
Applied Soil Ecology.2025; 206: 105831. CrossRef

Cultivation of Diverse Novel Marine Bacteria from Deep Ocean Sediment Using Spent Culture Supernatant of Ca. Bathyarchaeia Enrichment: Sidra Erum Ishaq, Tariq Ahmad, Lewen Liang, Ruize Xie, Tiantian Yu, Yinzhao Wang, Fengping Wang; J. Microbiol. 2024;62(8):611-625. Published online July 10, 2024; DOI: https://doi.org/10.1007/s12275-024-00145-w

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Abstract

Most microorganisms resist pure cultivation under conventional laboratory conditions. One of the primary issues for this un-culturability is the absence of biologically produced growth-promoting factors in traditionally defined growth media. However, whether cultivating microbes by providing spent culture supernatant of pivotal microbes in the growth medium can be an effective approach to overcome this limitation is still an under-explored area of research. Here, we used the spent culture medium (SCM) method to isolate previously uncultivated marine bacteria and compared the efficiency of this method with the traditional cultivation (TC) method. In the SCM method, Ca. Bathyarchaeia-enriched supernatant (10%) was used along with recalcitrant organic substrates such as lignin, humic acid, and organic carbon mixture. Ca. Bathyarchaeia, a ubiquitous class of archaea, have the capacity to produce metabolites, making their spent culture supernatant a key source to recover new bacterial stains. Both cultivation methods resulted in the recovery of bacterial species from the phyla Pseudomonadota, Bacteroidota, Actinomycetota, and Bacillota. However, our SCM approach also led to the recovery of species from rarely cultivated groups, such as Planctomycetota, Deinococcota, and Balneolota. In terms of the isolation of new taxa, the SCM method resulted in the cultivation of 80 potential new strains, including one at the family, 16 at the genus, and 63 at the species level, with a novelty ratio of ~ 35% (80/219). In contrast, the TC method allowed the isolation of ~ 10% (19/171) novel strains at species level only. These findings suggest that the SCM approach improved the cultivation of novel and diverse bacteria.

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Engineering the phycosphere: fundamental concepts and tools for the bottom-up design of microalgal-bacterial consortia
Austin Semple, Jagroop Pandhal
Applied Phycology.2025; 6(1): 21. CrossRef
Uncertainty Analysis of Biogas Generation and Gas Hydrate Accumulations in the Baiyun Sag, South China Sea
Pibo Su, Jinqiang Liang, Huai Cheng, Yaoyao Lv, Wei Zhang, Zuofei Zhu
Microorganisms.2024; 13(1): 5. CrossRef

Description of Deefgea piscis sp. nov., and Deefgea tanakiae sp. nov., isolated from the gut of Korean indigenous fish: Do-Hun Gim , So-Yeon Lee , Jeong Eun Han , Jae-Yun Lee , Seo Min Kang , Jin-Woo Bae; J. Microbiol. 2022;60(11):1061-1069. Published online September 1, 2022; DOI: https://doi.org/10.1007/s12275-022-2250-5

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Abstract

Three novel strains, (D17T, D13, and D25T) isolated from the gut of the Korean dark sleeper (Odontobutis platycephala), Kumgang fat minnow (Rhynchocypris kumgangensis), and the Korean oily bitterling (Tanakia koreensis) were identified as two novel species. Strains D17T and D13 showed the highest similarities in 16S rRNA gene and complete genome sequences to Deefgea rivuli WB 3.4-79T (98.0% and 97.9%, respectively, of 16S rRNA gene sequence similarity, 77.8% and 77.7%, respectively, of orthologous average nucleotide identity, Ortho- ANI, and 21.9% and 21.9%, respectively, of digital DNA-DNA hybridization, dDDH). Strain D17T showed the highest similarities in 16S rRNA gene and complete genome sequences to D13 (99.9% of 16S rRNA gene sequence similarity, 91.8% of OrthoANI, and 45.1% of dDDH); therefore, strains D17T and D13 were assigned as the same species. Strain D25T showed the highest similarities in 16S rRNA gene and complete genome sequences to D. chitinilytica Nsw-4T (98.2% of 16S rRNA gene sequence similarity, 82.4% of OrthoANI, and 25.1% of dDDH). Strains D17T and D13 were Gram-stain-negative, facultative anaerobes, rod-shaped, non-motile, and non-flagellated. Strain D25T was Gram-stain-negative, facultative anaerobe, rodshaped, and motile by a single polar flagellum. These strains had C16:0 and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c) as the major cellular fatty acids and possessed Q-8 as a major respiratory ubiquinone. All three strains contained phosphatidylethanolamine and phosphatidylglycerol as the major polar lipids. Based on polyphasic taxonomic data, strains D17T, D13, and D25T represent two novel species of the genus Deefgea. We propose the name Deefgea piscis sp. nov. for strains D17T (= KCTC 82958T = JCM 34941T) and D13 (= KCTC 92368), and Deefgea tanakiae sp. nov. for strain D25T (= KCTC 82959T = JCM 34942T).

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Fecal metagenomic and metabolomic analyses reveal non-invasive biomarkers of Flavobacterium psychrophilum infection in ayu ( Plecoglossus altivelis )
Mio Takeuchi, Erina Fujiwara-Nagata, Kyohei Kuroda, Kenji Sakata, Takashi Narihiro, Jun Kikuchi, Katherine McMahon
mSphere.2024;[Epub] CrossRef
Congregibacter variabilis sp. nov. and Congregibacter brevis sp. nov. Within the OM60/NOR5 Clade, Isolated from Seawater, and Emended Description of the Genus Congregibacter
Hyeonsu Tak, Miri S. Park, Hyerim Cho, Yeonjung Lim, Jang-Cheon Cho
Journal of Microbiology.2024; 62(9): 739. CrossRef
An update on novel taxa and revised taxonomic status of bacteria isolated from aquatic host species described in 2022–2023
Claire R. Burbick, Sara D. Lawhon, Brittany Bukouras, Giovanna Lazzerini, Erik Munson, Romney M. Humphries
Journal of Clinical Microbiology.2024;[Epub] CrossRef
Validation List no. 212. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Functional conservation of specialized ribosomes bearing genome-encoded variant rRNAs in Vibrio species
Younkyung Choi, Eunkyoung Shin, Minho Lee, Ji-Hyun Yeom, Kangseok Lee, Bashir Sajo Mienda
PLOS ONE.2023; 18(12): e0289072. CrossRef

Review

Transmissibility and pathogenicity of SARS-CoV-2 variants in animal models: Young-Il Kim , Mark Anthony B. Casel , Young Ki Choi; J. Microbiol. 2022;60(3):255-267. Published online March 2, 2022; DOI: https://doi.org/10.1007/s12275-022-2033-z

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Abstract

As of February 2022, SARS-CoV-2 is still one of the most serious public health threats due to its high mortality rate and rapid spread of novel variants. Since the first outbreak in 2019, general understanding of SARS-CoV-2 has been improved through basic and clinical studies; however, knowledge gaps still exist in our understanding of the emerging novel SARSCoV- 2 variants, which impacts the corresponding development of vaccines and therapeutics. Especially, accumulation of mutations in SARS-CoV-2 and rapid spread in populations with previous immunity has resulted in selection of variants that evade the host immune response. This phenomenon threatens to render current SARS-CoV-2 vaccines ineffective for controlling the pandemic. Proper animal models are essential for detailed investigations into the viral etiology, transmission and pathogenesis mechanisms, as well as evaluation of the efficacy of vaccine candidates against recent SARS-CoV-2 variants. Further, the choice of animal model for each research topic is important for researchers to gain better knowledge of recent SARS-CoV-2 variants. Here, we review the advantages and limitations of each animal model, including mice, hamsters, ferrets, and non-human primates, to elucidate variant SARS-CoV-2 etiology and transmission and to evaluate therapeutic and vaccine efficacy.

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In vivo characterization of ACE2 expression in Sprague-Dawley rats and cultured primary brain pericytes highlights the utility of Rattus norvegicus in the study of COVID-19 brain pathophysiology
Eugene Park, Elaine Liu, Andrew J. Baker
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Utilizing non‐human primate models to combat recent COVID‐19/SARS‐CoV‐2 and viral infectious disease outbreaks
Taeho Kwon
Journal of Medical Primatology.2024;[Epub] CrossRef
Early detection of highly transmissible viral variants using phylogenomics
Michael R. May, Bruce Rannala
Science Advances.2024;[Epub] CrossRef
Animal Models, Zoonotic Reservoirs, and Cross-Species Transmission of Emerging Human-Infecting Coronaviruses
Yakhouba Kane, Gary Wong, George F. Gao
Annual Review of Animal Biosciences.2023; 11(1): 1. CrossRef
SARS-CoV-2 Aerosol and Intranasal Exposure Models in Ferrets
Elizabeth E. Zumbrun, Samantha E. Zak, Eric D. Lee, Philip A. Bowling, Sara I. Ruiz, Xiankun Zeng, Jeffrey W. Koehler, Korey L. Delp, Russel R. Bakken, Shannon S. Hentschel, Holly A. Bloomfield, Keersten M. Ricks, Tamara L. Clements, April M. Babka, John
Viruses.2023; 15(12): 2341. CrossRef
The Isolation and In Vitro Differentiation of Primary Fetal Baboon Tracheal Epithelial Cells for the Study of SARS-CoV-2 Host-Virus Interactions
Bharathiraja Subramaniyan, Sunam Gurung, Manish Bodas, Andrew R. Moore, Jason L. Larabee, Darlene Reuter, Constantin Georgescu, Jonathan D. Wren, Dean A. Myers, James F. Papin, Matthew S. Walters
Viruses.2023; 15(4): 862. CrossRef
Distinctive Combinations of RBD Mutations Contribute to Antibody Evasion in the Case of the SARS-CoV-2 Beta Variant
Tae-Hun Kim, Sojung Bae, Sunggeun Goo, Jinjong Myoung
Journal of Microbiology and Biotechnology.2023; 33(12): 1587. CrossRef
Two years of COVID-19 pandemic: where are we now?
Jinjong Myoung
Journal of Microbiology.2022; 60(3): 235. CrossRef
SARS CoV-2 (Delta Variant) Infection Kinetics and Immunopathogenesis in Domestic Cats
Miruthula Tamil Selvan, Sachithra Gunasekara, Ping Xiao, Kristen Griffin, Shannon R. Cowan, Sai Narayanan, Akhilesh Ramachandran, Darren E. Hagen, Jerry W. Ritchey, Jennifer M. Rudd, Craig A. Miller
Viruses.2022; 14(6): 1207. CrossRef

Journal Articles

Characterization of a cold-adapted debranching enzyme and its role in glycogen metabolism and virulence of Vibrio vulnificus MO6-24/O: Ah-Reum Han , Haeyoung Kim , Jong-Tae Park , Jung-Wan Kim; J. Microbiol. 2022;60(4):375-386. Published online February 14, 2022; DOI: https://doi.org/10.1007/s12275-022-1507-3

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Abstract

Vibrio vulnificus MO6-24/O has three genes annotated as debranching enzymes or pullulanase genes. Among them, the gene encoded by VVMO6_03032 (vvde1) shares a higher similarity at the amino acid sequence level to the glycogen debranching enzymes, AmyX of Bacillus subtilis (40.5%) and GlgX of Escherichia coli (55.5%), than those encoded by the other two genes. The vvde1 gene encoded a protein with a molecular mass of 75.56 kDa and purified Vvde1 efficiently hydrolyzed glycogen and pullulan to shorter chains of maltodextrin and maltotriose (G3), respectively. However, it hydrolyzed amylopectin and soluble starch far less efficiently, and β-cyclodextrin (β-CD) only rarely. The optimal pH and temperature of Vvde1 was 6.5 and 25°C, respectively. Vvde1 was a cold-adapted debranching enzyme with more than 60% residual activity at 5°C. It could maintain stability for 2 days at 25°C and 1 day at 35°C, but it destabilized drastically at 40°C. The Vvde1 activity was inhibited considerably by Cu2+, Hg2+, and Zn2+, while it was slightly enhanced by Co2+, Ca2+, Ni2+, and Fe2+. The vvde1 knock-out mutant accumulated more glycogen than the wild-type in media supplemented with 1.0% maltodextrin; however, the side chain length distribution of glycogen was similar to that of the wild-type except G3, which was much more abundant in the mutant. Therefore, Vvde1 seemed to debranch glycogen with the degree of polymerization 3 (DP3) as the specific target branch length. Virulence of the pathogen against Caenorhabditis elegans was attenuated significantly by the vvde1 mutation. These results suggest that Vvde1 might be a unique glycogen debranching enzyme that is involved in both glycogen utilization and shaping of glycogen molecules, and contributes toward virulence of the pathogen.

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Characterization of glycogen-related glycoside hydrolase glgX and glgB from Klebsiella pneumoniae and their roles in biofilm formation and virulence
Xinyue Liu, Jialin Li, Ruibing Wu, Liping Bai
Frontiers in Cellular and Infection Microbiology.2024;[Epub] CrossRef
Function of the mdxR gene encoding a novel regulator for carbohydrate metabolism and sporulation in Bacillus subtilis 168
Tianshi Wang, Jung-Wan Kim
Archives of Microbiology.2023;[Epub] CrossRef
Identification of a novel cyclomaltodextrinase annotated as a neopullulanase in the genome of Bacillus cereus
Bo-Ram Park, Davoodbasha MubarakAli, Jung-Wan Kim
Archives of Microbiology.2023;[Epub] CrossRef
Functional conservation of specialized ribosomes bearing genome-encoded variant rRNAs in Vibrio species
Younkyung Choi, Eunkyoung Shin, Minho Lee, Ji-Hyun Yeom, Kangseok Lee, Bashir Sajo Mienda
PLOS ONE.2023; 18(12): e0289072. CrossRef
Functional characterization of maltodextrin glucosidase for maltodextrin and glycogen metabolism in Vibrio vulnificus MO6-24/O
Hye-Young Kim, MubarakAli Davoodbasha, Jung-Wan Kim
Archives of Microbiology.2022;[Epub] CrossRef

Differences in seroprevalence between epicenter and non-epicenter areas of the COVID-19 outbreak in South Korea: Hye Won Jeong , Hyun-Ha Chang , Eun Ji Kim , Yu Kyung Kim , Se-Mi Kim , Eun-Ha Kim , Young-Il Kim , Mark Anthony B. Casel , Seong-Gyu Kim , Rare Rollon , Seung-Gyu Jang , Kwang-Min Yu , Hee-Sung Kim , Hee Sue Park , Su-Jin Park , Yong-Dae Kim , Eung-Gook Kim , Young Ki Choi; J. Microbiol. 2021;59(5):530-533. Published online April 28, 2021; DOI: https://doi.org/10.1007/s12275-021-1095-7

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Abstract

To compare the standardized severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) seroprevalence of high epicenter region with non-epicenter region, serological studies were performed with a total of 3,268 sera from Daegu City and 3,981 sera from Chungbuk Province. Indirect immunofluorescence assay (IFA) for SARS-CoV-2 IgG results showed a high seroprevalence rate in the Daegu City (epicenter) compared with a non-epicenter area (Chungbuk Province) (1.27% vs. 0.91%, P = 0.0358). It is noteworthy that the highest seroprevalence in Daegu City was found in elderly patients (70’s) whereas young adult patients (20’s) in Chungbuk Province showed the highest seroprevalence. Neutralizing antibody (NAb) titers were found in three samples from Daegu City (3/3, 268, 0.09%) while none of the samples from Chungbuk Province were NAb positive. These results demonstrated that even following the large outbreak, the seropositive rate of SARS-CoV-2 in the general population remained low in South Korea.

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Distinctive Combinations of RBD Mutations Contribute to Antibody Evasion in the Case of the SARS-CoV-2 Beta Variant
Tae-Hun Kim, Sojung Bae, Sunggeun Goo, Jinjong Myoung
Journal of Microbiology and Biotechnology.2023; 33(12): 1587. CrossRef
The Seroprevalence of SARS-CoV-2 in Children During Early COVID-19 Pandemic in Korea: A Nationwide, Population-Based Study
Jin Lee, Young June Choe, Dohsik Minn, Jong-Hyun Kim
Journal of Korean Medical Science.2022;[Epub] CrossRef

Paradesulfovibrio onnuriensis gen. nov., sp. nov., a chemolithoautotrophic sulfate-reducing bacterium isolated from the Onnuri vent field of the Indian Ocean and reclassification of Desulfovibrio senegalensis as Paradesulfovibrio senegalensis comb. nov.: Yun Jae Kim , Jhung-Ahn Yang , Jae Kyu Lim , Mi-Jeong Park , Sung-Hyun Yang , Hyun Sook Lee , Sung Gyun Kang , Jung-Hyun Lee , Kae Kyoung Kwon; J. Microbiol. 2020;58(4):252-259. Published online February 27, 2020; DOI: https://doi.org/10.1007/s12275-020-9376-0

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Abstract

An anaerobic, rod-shaped, mesophilic, chemolithoautotrophic, sulfate-reducing bacterial strain IOR2T was isolated from a newly found deep-sea hydrothermal vent (OVF, Onnuri Vent Field) area in the central Indian Ocean ridge (11°24􍿁88􍿂􀁇 S 66°25􍿁42􍿂􀁇E, 2021 m water depth). The 16S rRNA gene sequence analysis revealed that the strain IOR2T was most closely related to Desulfovibrio senegalensis BLaC1T (96.7%). However, it showed low similarity with the members of the family Desulfovibrionaceae, such as Desulfovibrio tunisiensis RB22T (94.0%), D. brasiliensis LVform1T (93.9%), D. halophilus DSM 5663T (93.7%), and Pseudodesulfovibrio aespoeensis Aspo-2T (93.2%). The strain IOR2T could grow at 23– 42°C (optimum 37°C), pH 5.0–8.0 (optimum pH 7.0) and with 0.5–6.5% (optimum 3.0%) NaCl. The strain could use lactate, pyruvate, H2, and glycerol as electron donors and sulfate, thiosulfate, and sulfite as electron acceptors. The major fatty acids of the strain IOR2T were iso-C15:0, iso-C17:0, anteiso- C15:0, and summed feature 9 (C16:0 methyl/iso-C17:1ω9c). Both the strains IOR2T and BLaC1T could grow with CO2 and H2 as the sole sources of carbon and energy, respectively. Genomic evidence for the Wood-Ljungdahl pathway in both the strains reflects chemolithoautotrophic growth. The DNA G + C content of the strain IOR2T and BLaC1T was 58.1–60.5 mol%. Based on the results of the phylogenetic and physiologic studies, Paradesulfovibrio onnuriensis gen. nov., sp. nov. with the type strain IOR2T (= KCTC 15845T = MCCC 1K04559T) was proposed to be a member of the family Desulfovibrionaceae. We have also proposed the reclassification of D. senegalensis as Paradesulfovibrio senegalensis comb. nov.

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Sulfate-Reducing Bacteria Isolated from an Oil Field in Kazakhstan and a Description of Pseudodesulfovibrio karagichevae sp. nov.
Salimat K. Bidzhieva, Tatyana P. Tourova, Denis S. Grouzdev, Salima R. Samigullina, Diyana S. Sokolova, Andrey B. Poltaraus, Alexander N. Avtukh, Vera M. Tereshina, Andrey V. Mardanov, Nurlan S. Zhaparov, Tamara N. Nazina
Microorganisms.2024; 12(12): 2552. CrossRef
Sulfur fertilization integrated with soil redox conditions reduces Cd accumulation in rice through microbial induced Cd immobilization
Quan Zhang, Hai-Fei Chen, Dao-You Huang, Xiao-Bin Guo, Chao Xu, Han-Hua Zhu, Bo Li, Tong-Tong Liu, Ren-Wei Feng, Qi-Hong Zhu
Science of The Total Environment.2022; 824: 153868. CrossRef
Pseudodesulfovibrio sediminis sp. nov., a mesophilic and neutrophilic sulfate-reducing bacterium isolated from sediment of a brackish lake
Ayaka Takahashi, Hisaya Kojima, Miho Watanabe, Manabu Fukui
Archives of Microbiology.2022;[Epub] CrossRef
Diversity and biogenesis contribution of sulfate-reducing bacteria in arsenic-contaminated soils from realgar deposits
Xianbin Zhu, Liyuan Chen, Hongzhong Pan, Lei Wang, Xun Zhang, Dan Wang
Environmental Science and Pollution Research.2022; 29(21): 31110. CrossRef
A sulfate-reducing bacterial genus, Desulfosediminicola gen. nov., comprising two novel species cultivated from tidal-flat sediments
Jaeho Song, Juchan Hwang, Ilnam Kang, Jang-Cheon Cho
Scientific Reports.2021;[Epub] CrossRef
Desulfomarina profundi gen. nov., sp. nov., a novel mesophilic, hydrogen-oxidizing, sulphate-reducing chemolithoautotroph isolated from a deep-sea hydrothermal vent chimney
Yurina Hashimoto, Akihiro Tame, Shigeki Sawayama, Junichi Miyazaki, Ken Takai, Satoshi Nakagawa
International Journal of Systematic and Evolutionary Microbiology.2021;[Epub] CrossRef
Pseudodesulfovibrio mercurii sp. nov., a mercury-methylating bacterium isolated from sediment
Cynthia C. Gilmour, Ally Bullock Soren, Caitlin M. Gionfriddo, Mircea Podar, Judy D. Wall, Steven D. Brown, Joshua K. Michener, Maria Soledad Goñi Urriza, Dwayne A. Elias
International Journal of Systematic and Evolutionary Microbiology .2019;[Epub] CrossRef

Flavobacterium zhairuonensis sp. nov., a gliding bacterium isolated from marine sediment of the East China Sea: Sanjit Chandra Debnath , Ahmed Mohammed Abdo Miyah , Can Chen , Huan Sheng , Xue-Wei Xu , Yue-Hong Wu , Dao-Qiong Zheng , Jin-Zhong Xu , Ya-Nan Di , Pin-Mei Wang , Li Shen; J. Microbiol. 2019;57(12):1065-1072. Published online September 27, 2019; DOI: https://doi.org/10.1007/s12275-019-9194-4

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Abstract

A yellow pigmented, Gram-stain-negative, aerobic bacterium designated A5.7T was studied to evaluate the taxonomic position following the modern polyphasic approach. The strain was isolated from sediments near Zhairuo Island, which is situated in the East China Sea. Cells were non-spore forming rods without flagella but showed motility by gliding. Growth was observed at 15–35°C (optimum 28°C), pH 6.0–9.0 (optimum pH 6.5) and 0–2% (w/v) NaCl (optimum 0–0.5%) in LB broth. The major respiratory quinone of A5.7T was menaquinone 6. The major polar lipid of A5.7T was phosphatidylethanolamine and the predominant fatty acids (> 5%) were iso-C15:0, iso-C17:0 3-OH, C15:1 ω6c, iso-C15:0 3-OH, iso-C15:1 G, summed feature 3 (C16:1 ω7c and/or C16:1 ω6c) and summed feature 9 (iso-C17:1 ω9c and/or C16:0 10-methyl). Phylogenetic analysis based on 16S rRNA gene sequences showed that the isolate belongs to the genus Flavobacterium and shares the highest sequence similarities with Flavobacterium sharifuzzamanii A7.6T (98.5%), Flavobacterium tistrianum GB 56.1T (98.3%), Flavobacterium nitrogenifigens NXU-44T (97.8%), Flavobacterium anhuiense D3T (97.6%), Flavobacterium ginsenosidimutans THG 01T (97.6%), and Flavobacterium foetidum CJ42T (97.6%). Digital DNA-DNA hybridization and average nucleotide identity values between the strain and its closest phylogenetic neighbors showed the ranges from 19.6 to 34.1% and 73.7 to 87.9%, respectively. Therefore, based on polyphasic characteristics, strain A5.7T represents a novel species of the genus Flavobacterium for which the name Flavobacterium zhairuonensis sp. nov. is proposed. The type strain is A5.7T (= KCTC 62406T = MCCC 1K03494T).

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Qi Ran, Xinran Du, Lin Han, Jingjing Wang, Yue-zhong Li
International Journal of Systematic and Evolutionary Microbiology .2024;[Epub] CrossRef
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Hyunyoung Jo, Miri S. Park, Yeonjung Lim, Ilnam Kang, Jang-Cheon Cho
Journal of Microbiology.2023; 61(5): 495. CrossRef
Description of Flavobacterium cyclinae sp. nov. and Flavobacterium channae sp. nov., isolated from the intestines of Cyclina sinensis (Corb shell) and Channa argus (Northern snakehead)
Seomin Kang, Jae-Yun Lee, Jeong Eun Han, Yun-Seok Jeong, Do-Hun Gim, Jin-Woo Bae
Journal of Microbiology.2022; 60(9): 890. CrossRef
Flavobacterium litorale sp. nov., isolated from red alga
Neak Muhammad, Ho Le Han, Yong-Jae Lee, Jaeho Ko, Tra T. H. Nguyen, Song-Gun Kim
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Flavobacterium salilacus sp. nov., isolated from surface water of a hypersaline lake, and descriptions of Flavobacterium salilacus subsp. altitudinum subsp. nov. and Flavobacterium salilacus subsp. salilacus subsp. nov.
Sanjit Chandra Debnath, Can Chen, Ishrat Khan, Wen-Jie Wang, Dao-Qiong Zheng, Jin-Zhong Xu, Pin-Mei Wang
International Journal of Systematic and Evolutionary Microbiology .2020; 70(7): 4250. CrossRef
List of new names and new combinations previously effectively, but not validly, published
Aharon Oren, George Garrity
International Journal of Systematic and Evolutionary Microbiology .2020; 70(3): 1443. CrossRef
Flavobacterium phycosphaerae sp. nov. isolated from the phycosphere of Microcystis aeruginosa
Minkyung Kim, Byoung-Hee Lee, Ki-Eun Lee, Woojun Park
International Journal of Systematic and Evolutionary Microbiology .2019;[Epub] CrossRef

Isolation and characterization of a novel piezotolerant bacterium Lysinibacillus yapensis sp. nov., from deep-sea sediment of the Yap Trench, Pacific Ocean: Libo Yu , Xixiang Tang , Shiping Wei , Yinkun Qiu , Xiashutong Xu , Guangxin Xu , Qilin Wang , Qian Yang; J. Microbiol. 2019;57(7):562-568. Published online June 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8709-3

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Abstract

A Gram-positive, aerobic, rod-shaped, spore-forming bacterium, designated YLB-03T, with peritrichous flagella was isolated from deep-sea sediment of the Yap Trench at a depth of 4435 m. The bacterium was found to be catalase-positive but oxidase-negative. Growth of this bacterium was observed at 15–50°C (optimum 37°C), pH 5–10.5 (optimum 7), 0–5% NaCl (optimum 1%, w/v) and 0.1–50 MPa (optimum 0.1 MPa). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain YLB-03T was a member of the genus Lysinibacillus. Strain YLB-03T was closely related to Lysinibacillus sinduriensis BLB-1T and Lysinibacillus chungkukjangi 2RL3-2T (98.4%), Lysinibacillus halotolerans LAM- 612T (98.0%), Lysinibacillus telephonicus KT735049T (97.5%), Lysinibacillus endophyticus C9T (97.5%), Lysinibacillus composti NCCP-36T and Lysinibacillus massiliensis 4400831T (97.3%). The ANI and the GGDC DNA-DNA hybridization estimate values between strain YLB-03T and closely related type strains were 73.7–76.3% and 34.7–38.7%, respectively. The principal fatty acids were anteiso-C15:0 and iso-C15:0. The G+C content of the chromosomal DNA was 39.6 mol%. The respiratory quinone was determined to be MK-7. The diagnostic amino acids in the cell wall peptidoglycan contained Lys-Asp (type A4α) and the cell-wall sugars were glucose and xylose. The polar lipids included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and an unidentified phospholipid. The combined genotypic and phenotypic data showed that strain YLB-03T represents a novel species within the genus Lysinibacillus, for which the name Lysinibacillus yapensis sp. nov. is proposed, with the type strain YLB-03T (= MCCC 1A12698T = JCM 32871T).

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Bacteroides sedimenti sp. nov., isolated from a chloroethenesdechlorinating consortium enriched from river sediment: Mohamed Ismaeil , Naoko Yoshida , Arata Katayama; J. Microbiol. 2018;56(9):619-627. Published online August 23, 2018; DOI: https://doi.org/10.1007/s12275-018-8187-z

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Abstract

A Gram-negative, anaerobic, non-motile, non-spore-forming bacterial strain, designated YN3PY1T, was isolated from a chloroethene-dechlorinating consortium originally enriched from river sediment. The strain enhanced the dechlorination of cis-dichloroethene to ethene by Dehalococcoides, especially at the early stages of cultivation. Strain YN3PY1T was the first isolate of the genus Bacteroides, obtained from animal- independent environments, and its 16S rRNA gene had the highest sequence similarity (97.1%) with Bacteroides luti JCM 19020T in the ‘Coprosuis’ clade of the genus Bacteroides. Strain YN3PY1T formed a phylogenetic cluster with other phylotypes detected from sediments and paddy soil, and the cluster was affiliated with a linage of so-called free-living Bacteroides detected from animal-independent environments, suggesting specific adaptations to sediment-like environments. The strain showed typical phenotypes of Bacteroides, i.e., polysaccharolytic anaerobe having anteiso-C15:0 as the most abundant fatty acid and MK-11 as one of the major respiratory quinones. Additionally, the strain uniquely transforms glucose to lactate and malate, has MK-12 as another major respiratory quinone, and grows at comparatively low temperatures, i.e. 10–40°C, with an optimum at 28°C. Based on the presented data, strain YN3PY1T (= KCTC 15656T = NBRC 113168T) can be proposed as a novel species of the genus Bacteroides and named as Bacteroides sedimenti sp. nov.

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Flavihumibacter profundi sp. nov., isolated from eutrophic freshwater sediment: Ting-Ting Ren , Chun-Zhi Jin , Feng-Jie Jin , Taihua Li , Chang-Jin Kim , Hee-Mock Oh , Hyung-Gwan Lee , Long Jin; J. Microbiol. 2018;56(7):467-471. Published online June 28, 2018; DOI: https://doi.org/10.1007/s12275-018-7567-8

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Abstract

A Gram-stain-positive, aerobic, non-motile, non-spore-forming, and rod-shaped bacterium, designated strain CHu64- 6-1T, was isolated from a 67-cm-long sediment core collected from the Daechung Reservoir at a water depth of 17-m in Daejeon, Republic of Korea. Comparative 16S rRNA gene sequence studies placed the new isolate in the class Sphingobacteriia, and the isolate is notably most closely related to Flavihumibacter sediminis CJ663T (98.1% similarity), Flavihumibacter solisilvae 3-3T (97.8%), Flavihumibacter petaseus T41T (97.5%), Flavihumibacter cheonanensis WS16T (97.4%), and Flavihumibacter stibioxidans YS-17T (97.2%). The cells of strain CHu64-6-1T formed yellow colonies on R2A agar and contained MK-7 as the only menaquinone, phosphatidylethanolamine, an unidentified phospholipid, and two unidentified aminolipids as the major polar lipids, and C15:0 iso, C17:0 iso 3-OH, C15:1 iso G, and C16:1 ω5c as the major fatty acids (> 5%). The DNA G + C content of the genome was determined to be 46.5 mol%. The DNA-DNA hybridization values of strain CHu64-6-1T with F. sediminis CJ663T, F. solisilvae 3-3T, F. petaseus T41T, F. cheonanensis WS16T, and F. stibioxidans YS-17T were 12.4–33.2%. Based on the combined genotypic and phenotypic data, we propose that strain CHu64-6-1T represents a novel species of the genus Flavihumibacter, for which the name Flavihumibacter profundi sp. nov. is proposed. The type strain is CHu64-6-1T (= KCTC 62290T = CCTCC AB 2018060T).

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Magnetite production and transformation in the methanogenic consortia from coastal riverine sediments: Shiling Zheng , Bingchen Wang , Fanghua Liu , Oumei Wang; J. Microbiol. 2017;55(11):862-870. Published online October 27, 2017; DOI: https://doi.org/10.1007/s12275-017-7104-1

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Abstract

Minerals that contain ferric iron, such as amorphous Fe(III) oxides (A), can inhibit methanogenesis by competitively accepting electrons. In contrast, ferric iron reduced products, such as magnetite (M), can function as electrical conductors to stimulate methanogenesis, however, the processes and effects of magnetite production and transformation in the methanogenic consortia are not yet known. Here we compare the effects on methanogenesis of amorphous Fe (III) oxides (A) and magnetite (M) with ethanol as the electron donor. RNAbased terminal restriction fragment length polymorphism with a clone library was used to analyse both bacterial and archaeal communities. Iron (III)-reducing bacteria including Geobacteraceae and methanogens such as Methanosarcina were enriched in iron oxide-supplemented enrichment cultures for two generations with ethanol as the electron donor. The enrichment cultures with A and non-Fe (N) dominated by the active bacteria belong to Veillonellaceae, and archaea belong to Methanoregulaceae and Methanobacteriaceae, Methanosarcinaceae (Methanosarcina mazei), respectively. While the enrichment cultures with M, dominated by the archaea belong to Methanosarcinaceae (Methanosarcina barkeri). The
results
also showed that methanogenesis was accelerated in the transferred cultures with ethanol as the electron donor during magnetite production from A reduction. Powder X-ray diffraction analysis indicated that magnetite was generated from microbial reduction of A and M was transformed into siderite and vivianite with ethanol as the electron donor. Our data showed the processes and effects of magnetite production and transformation in the methanogenic consortia, suggesting that significantly different effects of iron minerals on microbial methanogenesis in the iron-rich coastal riverine environment were present.

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Cyclobacterium sediminis sp. nov. isolated from a sea cucumber aquaculture farm and emended description of the genus Cyclobacterium: Seyeon Shin , Hyung-Yeel Kahng; J. Microbiol. 2017;55(2):90-95. Published online January 26, 2017; DOI: https://doi.org/10.1007/s12275-017-6484-6

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Abstract

An aerobic, Gram-negative bacterium, designated strain SD70T, was isolated from sea cucumber aquaculture farm sediment in Taean, Korea, and its taxonomic status was established by undertaking a polyphasic study. Cells of strain SD70T were non-motile, catalase-, and oxidase-positive, nonspore- forming, and horseshoe-shaped. Optimal growth was observed under 25–30°C, pH 7.0–8.0, and 3.0–5.0% (w/v) NaCl conditions. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain SD70T fell within an evolutionary group comprising species of the genus Cyclobacterium. Strain SD70T shared 92.1–98.5% 16S rRNA sequence similarity values with the type strains of species of the genus Cyclobacterium. Relatively low levels of DNA-DNA relatedness were found between strain SD70T and C. marinum DSM 745T (40.2%) and C. amurskyense KMM 6143T (15.8%). The predominant cellular fatty acids were iso-C15:0 (32.1%), and anteiso-C15:0 (9.1%). Menaquinone MK-7 was the only respiratory quinone. The G+C content of the genomic DNA was 36 mol%. The polar lipids were phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, and seven unidentified lipids. On the basis of phenotypic and genotypic data, strain SD70T represents a novel species of the genus Cyclobacterium, for which the name Cyclobacterium sediminis sp. nov. is proposed. An emended description of the genus Cyclobacterium is also provided.

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Research Support, Non-U.S. Gov'ts

Abyssisolibacter fermentans gen. nov. sp. nov., isolated from deep sub-seafloor sediment: Wonduck Kim , Jung-Hyun Lee , Kae Kyoung Kwon; J. Microbiol. 2016;54(5):347-352. Published online April 20, 2016; DOI: https://doi.org/10.1007/s12275-016-6048-1

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Abstract

A Gram-staining-negative, thin rod-shaped, anaerobic bacterium designated MCWD3T was isolated from sediment of the deep sea in Ulleung Basin, East Sea, Korea. The ranges of temperature, pH and NaCl for growth of this strain were 15– 40°C (optimum 29°C), 5.0–10.0 (optimum pH 6.5), and 1–5%, respectively. The major fatty acids were iso-C15:0 (30%) and iso-C15:0 dimethyl acetal (17%). The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and unidentified aminophospholipids, phospholipids, and aminolipids. The fermentation product from yeast extract was acetate. Phylogenetic analysis based on 16S rRNA genes indicated that the isolate was related to Sporosalibacterium faouarense (92.8% sequence identity), Clostridiisalibacter paucivorans (92.6%), and Brassicibacter mesophilus (92.4%). However, the isolate was differentiated from these genera by both physiological and chemotaxonomical properties. On the basis of a polyphasic taxonomic analysis, we propose that MCWD3T represents a novel taxon with the name Abyssisolibacter fermentans gen. nov. sp. nov.

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Aliisedimentitalea scapharcae gen. nov., sp. nov., isolated from ark shell Scapharca broughtonii: Young-Ok Kim , Sooyeon Park , Bo-Hye Nam , Dong-Gyun Kim , Sung-Min Won , Ji-Min Park , Jung-Hoon Yoon; J. Microbiol. 2015;53(8):495-502. Published online July 31, 2015; DOI: https://doi.org/10.1007/s12275-015-5075-7

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Abstract

A Gram-negative, aerobic, non-spore-forming, motile and ovoid or rod-shaped bacterial strain, designated MA2-16T, was isolated from ark shell (Scapharca broughtonii) collected from the South Sea, South Korea. Strain MA2-16T was found to grow optimally at 30캜, at pH 7.0?.0 and in the presence of 2.0% (w/v) NaCl. Neighbour-joining, maximum-likelihood and maximum-parsimony phylogenetic trees based on 16S rRNA gene sequences revealed that strain MA2-16T clustered with the type strain of Sedimentitalea nanhaiensis. The novel strain exhibited a 16S rRNA gene sequence similarity value of 97.1% to the type strain of S. nanhaiensis. In the neighbour- joining phylogenetic tree based on gyrB sequences, strain MA2-16T formed an evolutionary lineage independent of those of other taxa. Strain MA2-16T contained Q-10 as the predominant ubiquinone and C18:1 ?c and 11-methyl C18:1 ?c as the major fatty acids. The major polar lipids of strain MA2-16T were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, an unidentified aminolipid and an unidentified lipid. The DNA G+C content of strain MA2- 16T was 57.7 mol% and its DNA-DNA relatedness values with the type strains of S. nanhaiensis and some phylogenetically related species of the genera Leisingera and Phaeobacter were 13?4%. On the basis of the data presented, strain MA2-16T is considered to represent a novel genus and novel species within the family Rhodobacteraceae, for which the name Aliisedimentitalea scapharcae gen. nov., sp. nov. is proposed. The type strain is MA2-16T (=KCTC 42119T =CECT 8598T).

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