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Sung-Keun Rhee 12 Articles
Transcriptomic Insights into Archaeal Nitrification in the Amundsen Sea Polynya, Antarctica
Joo-Han Gwak , Samuel Imisi Awala , So-Jeong Kim , Sang-Hoon Lee , Eun-Jin Yang , Jisoo Park , Jinyoung Jung , Sung-Keun Rhee
J. Microbiol. 2023;61(11):967-980.   Published online December 7, 2023
DOI: https://doi.org/10.1007/s12275-023-00090-0
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AbstractAbstract PDF
Antarctic polynyas have the highest Southern Ocean summer primary productivity, and due to anthropogenic climate change, these areas have formed faster recently. Ammonia-oxidizing archaea (AOA) are among the most ubiquitous and abundant microorganisms in the ocean and play a primary role in the global nitrogen cycle. We utilized metagenomics and metatranscriptomics to gain insights into the physiology and metabolism of AOA in polar oceans, which are associated with ecosystem functioning. A polar-specific ecotype of AOA, from the “Candidatus Nitrosomarinus”-like group, was observed to be dominant in the Amundsen Sea Polynya (ASP), West Antarctica, during a succession of summer phytoplankton blooms. AOA had the highest transcriptional activity among prokaryotes during the bloom decline phase (DC). Metatranscriptomic analysis of key genes involved in ammonia oxidation, carbon fixation, transport, and cell division indicated that this polar AOA ecotype was actively involved in nitrification in the bloom DC in the ASP. This study revealed the physiological and metabolic traits of this key polar-type AOA in response to phytoplankton blooms in the ASP and provided insights into AOA functions in polar oceans.

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  • Bulk metagenomics and machine learning unravels nitrogen metabolism patterns in extreme-temperature marine environments
    Zheng Guo, Yong-Guang Li, Xiao-Lin Liu, Zhao-Jie Teng, Qi-Long Qin, Qian-Qian Cha, Zhi-Bin Wang, Shou-Qing Ni
    Bioresource Technology.2026; 441: 133551.     CrossRef
  • Alleviated photoinhibition on nitrification in the Indian Sector of the Southern Ocean
    Lingfang Fan, Min Chen, Zifei Yang, Minfang Zheng, Yusheng Qiu
    Acta Oceanologica Sinica.2024; 43(7): 52.     CrossRef
Ammonia-oxidizing archaea in biological interactions
Jong-Geol Kim , Khaled S. Gazi , Samuel Imisi Awala , Man-Young Jung , Sung-Keun Rhee
J. Microbiol. 2021;59(3):298-310.   Published online February 23, 2021
DOI: https://doi.org/10.1007/s12275-021-1005-z
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  • 20 Web of Science
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AbstractAbstract PDF
The third domain Archaea was known to thrive in extreme or anoxic environments based on cultivation studies. Recent metagenomics- based approaches revealed a widespread abundance of archaea, including ammonia-oxidizing archaea (AOA) of Thaumarchaeota in non-extreme and oxic environments. AOA alter nitrogen species availability by mediating the first step of chemolithoautotrophic nitrification, ammonia oxidation to nitrite, and are important primary producers in ecosystems, which affects the distribution and activity of other organisms in ecosystems. Thus, information on the interactions of AOA with other cohabiting organisms is a crucial element in understanding nitrogen and carbon cycles in ecosystems as well as the functioning of whole ecosystems. AOA are self-nourishing, and thus interactions of AOA with other organisms can often be indirect and broad. Besides, there are possibilities of specific and obligate interactions. Mechanisms of interaction are often not clearly identified but only inferred due to limited knowledge on the interaction factors analyzed by current technologies. Here, we overviewed different types of AOA interactions with other cohabiting organisms, which contribute to understanding AOA functions in ecosystems.

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  • A Novel Perspective on the Instability of Mainstream Partial Nitrification: The Niche Differentiation of Nitrifying Guilds
    Xiaochuan Ran, Tong Wang, Mingda Zhou, Zibin Li, Han Wang, Gazhit Ts. Tsybekmitova, Jianhua Guo, Yayi Wang
    Environmental Science & Technology.2025; 59(18): 8922.     CrossRef
  • Identification of structural and regulatory cell-shape determinants in Haloferax volcanii
    Heather Schiller, Yirui Hong, Joshua Kouassi, Theopi Rados, Jasmin Kwak, Anthony DiLucido, Daniel Safer, Anita Marchfelder, Friedhelm Pfeiffer, Alexandre Bisson, Stefan Schulze, Mechthild Pohlschroder
    Nature Communications.2024;[Epub]     CrossRef
  • Nitrogen cycling process and application in different prawn culture modes
    Zhao Chen, Jian Li, Qianqian Zhai, Zhiqiang Chang, Jitao Li
    Reviews in Aquaculture.2024; 16(4): 1580.     CrossRef
  • Multidrug-resistant plasmid RP4 inhibits the nitrogen removal capacity of ammonia-oxidizing archaea, ammonia-oxidizing bacteria, and comammox in activated sludge
    Zhaohui Zhang, Lin Bo, Shang Wang, Chenyu Li, Xi Zhang, Bin Xue, Xiaobo Yang, Xinxin He, Zhiqiang Shen, Zhigang Qiu, Chen Zhao, Jingfeng Wang
    Environmental Research.2024; 242: 117739.     CrossRef
  • Distinct mechanisms drive plant-nitrifier interactions in topsoil and subsoil
    Di Liang, Niuniu Ji, Angela Kent, Wendy H. Yang
    Soil Biology and Biochemistry.2024; 192: 109370.     CrossRef
  • Diversity, composition, metabolic characteristics, and assembly process of the microbial community in sewer system at the early stage
    Yiming Yuan, Guangyi Zhang, Hongyuan Fang, Haifeng Guo, Yongkang Li, Zezhuang Li, Siwei Peng, Fuming Wang
    Environmental Science and Pollution Research.2024; 31(9): 13075.     CrossRef
  • Response of soil microbial community structure and function to the sewage leakage: A case study of a 25-year-old cesspool
    Xiaocheng Wei, Jiayin Liang, Tianyang Ning, Chunxue Zhang, Jiarui Wang, Lu Tan, Feng Shen
    Chemosphere.2024; 363: 142753.     CrossRef
  • Hiding in plain sight: The discovery of complete genomes of 11 hypothetical spindle‐shaped viruses that putatively infect mesophilic ammonia‐oxidizing archaea
    Yimin Ni, Tianqi Xu, Shuling Yan, Lanming Chen, Yongjie Wang
    Environmental Microbiology Reports.2024;[Epub]     CrossRef
  • Inulin from halophilic archaeon Haloarcula: Production, chemical characterization, biological, and technological properties
    Alejandra Aragón-León, Lorena Moreno-Vilet, Marisela González-Ávila, Pedro Martín Mondragón-Cortez, Guilherme Lanzi Sassaki, Raúl Balam Martínez-Pérez, Rosa María Camacho-Ruíz
    Carbohydrate Polymers.2023; 321: 121333.     CrossRef
  • Uncovering the Prokaryotic Diversity of the Bathyal Waters above the Kuril–Kamchatka Trench
    Susanna Gorrasi, Angelika Brandt, Francesca Pittino, Andrea Franzetti, Marcella Pasqualetti, Barbara Muñoz-Palazon, Giorgia Novello, Massimiliano Fenice
    Journal of Marine Science and Engineering.2023; 11(11): 2145.     CrossRef
  • Nitrous Oxide Distributions in the Oxygenated Water Column of the Sargasso Sea
    Annaliese C. S. Meyer, Jay T. Cullen, Damian S. Grundle
    Atmosphere-Ocean.2023; 61(3): 173.     CrossRef
  • An Initial Proteomic Analysis of Biogas-Related Metabolism of Euryarchaeota Consortia in Sediments from the Santiago River, México
    Jesús Barrera-Rojas, Kelly Joel Gurubel-Tun, Emmanuel Ríos-Castro, María Cristina López-Méndez, Belkis Sulbarán-Rangel
    Microorganisms.2023; 11(7): 1640.     CrossRef
  • Bacteria and Archaea Regulate Particulate Organic Matter Export in Suspended and Sinking Marine Particle Fractions
    Choaro D. Dithugoe, Oliver K. I. Bezuidt, Emma L. Cavan, William P. Froneman, Sandy J. Thomalla, Thulani P. Makhalanyane, Barbara J. Campbell
    mSphere.2023;[Epub]     CrossRef
  • Insights into the prokaryotic communities of the abyssal-hadal benthic-boundary layer of the Kuril Kamchatka Trench
    Susanna Gorrasi, Andrea Franzetti, Angelika Brandt, Ulrike Minzlaff, Marcella Pasqualetti, Massimiliano Fenice
    Environmental Microbiome.2023;[Epub]     CrossRef
  • Examining the Interaction Between Free‐Living Bacteria and Iron in the Global Ocean
    Anh Le‐Duy Pham, Olivier Aumont, Lavenia Ratnarajah, Alessandro Tagliabue
    Global Biogeochemical Cycles.2022;[Epub]     CrossRef
  • Omics-based microbiome analysis in microbial ecology: from sequences to information
    Jang-Cheon Cho
    Journal of Microbiology.2021; 59(3): 229.     CrossRef
Comparative genomic analysis of Geosporobacter ferrireducens and its versatility of anaerobic energy metabolism
Man-Young Jung , So-Jeong Kim , Jong-Geol Kim , Heeji Hong , Joo-Han Gwak , Soo-Je Park , Yang-Hoon Kim , Sung-Keun Rhee
J. Microbiol. 2018;56(5):365-371.   Published online May 2, 2018
DOI: https://doi.org/10.1007/s12275-018-7451-6
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AbstractAbstract PDF
Members of the family Clostridiaceae within phylum Firmicutes are ubiquitous in various iron-reducing environments. However, genomic data on iron-reducing bacteria of the family Clostridiaceae, particularly regarding their environmental distribution, are limited. Here, we report the analysis and comparison of the genomic properties of Geosporobacter ferrireducens IRF9, a strict anaerobe that ferments sugars and degrades toluene under iron-reducing conditions, with those of the closely related species, Geosporobacter subterraneus DSM 17957. Putative alkyl succinate synthase-encoding genes were observed in the genome of strain IRF9 instead of the typical benzyl succinate synthase-encoding genes. Canonical genes associated with iron reduction were not observed in either genome. The genomes of strains IRF9 and DMS 17957 harbored genes for acetogenesis, that encode two types of Rnf complexes mediating the translocation of H+ and Na+ ions, respectively. Strain IRF9 harbored two different types of ATPases (Na+-dependent F-type ATPase and H+- dependent V-type ATPase), which enable full exploitation of ion gradients. The versatile energy conservation potential of strain IRF9 promotes its survival in various environmental conditions.

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  • Promoting effects and mechanisms of common iron oxides on corrosion of carbon steel induced by methanogenic microbiota
    Jianping Wu, Weidong Zhang, Shanyu Xie, Zhaoshou Wang, Yuanpeng Wang
    Journal of Environmental Chemical Engineering.2025; 13(2): 115769.     CrossRef
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    Siwen Hu, Dayong Zhao, Rujia He, Xiaojian Sun, Jin Zeng
    Journal of Cleaner Production.2025; 501: 145295.     CrossRef
  • Co-exposure of microplastics and polychlorinated biphenyls strongly influenced the cycling processes of typical biogenic elements in anoxic soil
    Guangxue Xie, Qian Hou, Lianzhen Li, Yan Xu, Shaochong Liu, Xilin She
    Journal of Hazardous Materials.2024; 465: 133277.     CrossRef
  • A review on microbial diversity and genetic markers involved in methanogenic degradation of hydrocarbons: futuristic prospects of biofuel recovery from contaminated regions
    Kriti Sengupta, Siddhartha Pal
    Environmental Science and Pollution Research.2021; 28(30): 40288.     CrossRef
  • Iron and total organic carbon shape the spatial distribution pattern of sediment Fe(III) reducing bacteria in a volcanic lake, NE China
    Yue Zhan, Mengran Yang, Yu Zhang, Jian Yang, Weidong Wang, Lei Yan, Shuang Zhang
    World Journal of Microbiology and Biotechnology.2021;[Epub]     CrossRef
  • Maize straw biochar addition inhibited pentachlorophenol dechlorination by strengthening the predominant soil reduction processes in flooded soil
    Min Zhu, Xiaofei Lv, Ashley E. Franks, Philip C. Brookes, Jianming Xu, Yan He
    Journal of Hazardous Materials.2020; 386: 122002.     CrossRef
  • New Frontiers of Anaerobic Hydrocarbon Biodegradation in the Multi-Omics Era
    Krisztián Laczi, Ágnes Erdeiné Kis, Árpád Szilágyi, Naila Bounedjoum, Attila Bodor, György Erik Vincze, Tamás Kovács, Gábor Rákhely, Katalin Perei
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    Manal F. Alqahtani, Suman Bajracharya, Krishna P. Katuri, Muhammad Ali, Ala’a Ragab, Grégoire Michoud, Daniele Daffonchio, Pascal E. Saikaly
    Frontiers in Microbiology.2019;[Epub]     CrossRef
A novel methanotroph in the genus Methylomonas that contains a distinct clade of soluble methane monooxygenase
Ngoc-Loi Nguyen , Woon-Jong Yu , Hye-Young Yang , Jong-Geol Kim , Man-Young Jung , Soo-Je Park , Seong-Woon Roh , Sung-Keun Rhee
J. Microbiol. 2017;55(10):775-782.   Published online September 28, 2017
DOI: https://doi.org/10.1007/s12275-017-7317-3
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AbstractAbstract PDF
Aerobic methane oxidation is a key process in the global carbon cycle that acts as a major sink of methane. In this study, we describe a novel methanotroph designated EMGL16-1 that was isolated from a freshwater lake using the floating filter culture technique. Based on a phylogenetic analysis of 16S rRNA gene sequences, the isolate was found to be closely related to the genus Methylomonas in the family Methylococcaceae of the class Gammaproteobacteria with 94.2–97.4% 16S rRNA gene similarity to Methylomonas type strains. Comparison of chemotaxonomic and physiological properties further suggested that strain EMGL16-1 was taxonomically distinct from other species in the genus Methylomonas. The isolate was versatile in utilizing nitrogen sources such as molecular nitrogen, nitrate, nitrite, urea, and ammonium. The genes coding for subunit of the particulate form methane monooxygenase (pmoA), soluble methane monooxygenase (mmoX), and methanol dehydrogenase (mxaF) were detected in strain EMGL16-1. Phylogenetic analysis of mmoX indicated that mmoX of strain EMGL16-1 is distinct from those of other strains in the genus Methylomonas. This isolate probably represents a novel species in the genus. Our study provides new insights into the diversity of species in the genus Methylomonas and their environmental adaptations.

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  • Methylacidiphilum caldifontis gen. nov., sp. nov., a thermoacidophilic methane-oxidizing bacterium from an acidic geothermal environment, and descriptions of the family Methylacidiphilaceae fam. nov. and order Methylacidiphilales ord. nov.
    Samuel Imisi Awala, Joo-Han Gwak, Yongman Kim, Chanmee Seo, Andrea Strazzulli, Song-Gun Kim, Sung-Keun Rhee
    International Journal of Systematic and Evolutionary Microbiology .2023;[Epub]     CrossRef
  • Methylococcus mesophilus sp. nov., the first non-thermotolerant methanotroph of the genus Methylococcus, from a rice field
    Samuel Imisi Awala, Yongman Kim, Joo-Han Gwak, Chanmee Seo, Seungki Lee, Minseo Kang, Sung-Keun Rhee
    International Journal of Systematic and Evolutionary Microbiology .2023;[Epub]     CrossRef
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Calculibacillus koreensis gen. nov., sp. nov., an anaerobic Fe(III)-reducing bacterium isolated from sediment of mine tailings
Ui-Gi Min , So-Jeong Kim , Heeji Hong , Song-Gun Kim , Joo-Han Gwak , Man-Young Jung , Jong-Geol Kim , Jeong-Geol Na , Sung-Keun Rhee
J. Microbiol. 2016;54(6):413-419.   Published online May 27, 2016
DOI: https://doi.org/10.1007/s12275-016-6086-8
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AbstractAbstract PDF
A strictly anaerobic bacterium, strain B5T, was isolated from sediment of an abandoned coal mine in Taebaek, Republic of Korea. Cells of strain B5T were non-spore-forming, straight, Gram-positive rods. The optimum pH and temperature for growth were pH 7.0 and 30°C, respectively, while the strain was able to grow within pH and temperature ranges of 5.5– 7.5 and 25–45°C, respectively. Growth of strain B5T was observed at NaCl concentrations of 0 to 6.0% (w/v) with an optimum at 3.0–4.0% (w/v). The polar lipids consisted of phosphatidylethanolamine, phosphatidylglycerol, an unknown phospholipid and three unknown polar lipids. Strain B5T grew anaerobically by reducing nitrate, nitrite, ferric-citrate, ferric-nitrilotriacetate, elemental sulfur, thiosulfate, and anthraquinone- 2-sulfonate in the presence of proteinaceous compounds, organic acids, and carbohydrates as electron donors. The isolate was not able to grow by fermentation. Strain B5T did not grow under aerobic or microaerobic conditions. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain B5T is most closely related to the genus Tepidibacillus (T. fermentans STGHT; 96.3%) and Vulcanibacillus (V. modesticaldus BRT; 94.6%). The genomic DNA G+C content (36.9 mol%) of strain B5T was higher than those of T. fermentans STGHT (34.8 mol%) and V. modesticaldus BRT (34.5 mol%). Based on its phenotypic, chemotaxonomic, and phylogenetic properties, we describe a new species of a novel genus Calculibacillus, represented by strain B5T (=KCTC 15397T =JCM 19989T), for which we propose the name Calculibacillus koreensis gen. nov., sp. nov.

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  • Bacillales: From Taxonomy to Biotechnological and Industrial Perspectives
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NOTE] Evaluation of a Fosmid-Clone-Based Microarray for Comparative Analysis of Swine Fecal Metagenomes
Soo-Je Park , Dong-Hwan Kim , Man-Young Jung , So-Jeong Kim , Hongik Kim , Yang-Hoon Kim , Jong-Chan Chae , Sung-Keun Rhee
J. Microbiol. 2012;50(4):684-688.   Published online July 21, 2012
DOI: https://doi.org/10.1007/s12275-012-2115-4
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AbstractAbstract PDF
Glass slide arrayed with fosmid clone DNAs generated from swine feces as probes were fabricated and used as a metagenome microarray (MGA). MGA appeared to be specific to their corresponding target genomic fragments. The detection limit was 10 ng of genomic DNA (ca. 106 bacterial cells) in the presence of 1000 ng of background DNA. Linear relationships between the signal intensity and the target DNA (20–100 ng) were observed (r2=0.98). Application of MGA to the comparison of swine fecal metagenomes suggested that the microbial community composition of swine intestine could be dependent on the health state of swine.
Molecular Analysis of Spatial Variation of Iron-Reducing Bacteria in Riverine Alluvial Aquifers of the Mankyeong River
So-Jeong Kim , Dong-Chan Koh , Soo-Je Park , In-Tae Cha , Joong-Wook Park , Jong-Hwa Na , Yul Roh , Kyung-Seok Ko , Kangjoo Kim , Sung-Keun Rhee
J. Microbiol. 2012;50(2):207-217.   Published online April 27, 2012
DOI: https://doi.org/10.1007/s12275-012-1342-z
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AbstractAbstract PDF
Alluvial aquifers are one of the mainwater resources in many countries. Iron reduction in alluvial aquifers is often a major anaerobic process involved in bioremediation or causing problems, including the release of As trapped in Fe(III) oxide. We investigated the distribution of potential iron-reducing bacteria (IRB) in riverine alluvial aquifers (B1, B3, and B6 sites) at the Mankyeong River, Republic of Korea. Inactive iron reduction zones, the diversity and abundance of IRB can be examined using a clone library and quantitative PCR analysis of 16S rRNA genes. Geobacter spp. are potential IRB in the iron-reducing zone at the B6 (9 m) site, where high Fe(II) and arsenic (As) concentrations were observed. At the B3 (16 m) site, where low iron reduction activity was predicted, a dominant clone (10.6%) was 99% identical in 16S rRNA gene sequence with Rhodoferax ferrireducens. Although a major clone belonging to Clostridium spp. was found, possible IRB candidates could not be unambiguously determined at the B1 (18 m) site. Acanonical correspondence analysis demonstrated that, among potential IRB, only the Geobacteraceae were well correlated with Fe(II) and As concentrations. Our results indicate high environmental heterogeneity, and thus high spatial variability, in thedistribution of potential IRB in the riverine alluvial aquifersnear the Mankyeong River.

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Metagenomic Assessment of a Sulfur-Oxidizing Enrichment Culture Derived from Marine Sediment
Man-Young Jung , VinhHoa Pham , Soo-Je Park , So-Jeong Kim , Jong-Chan Chae , Yul Roh , Sung-Keun Rhee
J. Microbiol. 2010;48(6):739-747.   Published online January 9, 2011
DOI: https://doi.org/10.1007/s12275-010-0257-9
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AbstractAbstract PDF
The biological oxidation of reduced sulfur compounds is a critically important process in global sulfur biogeochemistry. In this study, we enriched from marine sediments under denitrifying conditions, chemolithotrophic sulfur oxidizers that could oxidize a variety of reduced sulfur compounds: thiosulfate, tetrathionate, sulfide, and polysulfide. Two major phylotypes of 16S rRNA gene (>99% identity in each phylotype) were detected in this enrichment culture. In order to characterize sulfide oxidation, we sequenced and characterized one fosmid clone (43.6 kb) containing the group I sulfide-quinone reductase (sqr) gene. Interestingly, four putative rhodanese genes were found in this clone. Furthermore, comparative alignment with the closest genome of Thiomicrospira crunogena XCL2 revealed that three homologous genes were located within the vicinity of the sqr gene. Fosmid clones harboring carbon fixation (cbbL and cbbM) and denitrification (narG) genes were screened, and the phylogeny of the functional genes was analyzed. Along with the comparison between the sqr-containing fosmid clones and the relevant gamma-proteobacteria, our phylogenetic study based on the 16S rRNA gene and carbon fixation genes suggest the prevalence of chemolithotrophic gamma-proteobacteria in the denitrifying cultures. The findings of this study imply that a combination of cultivation and metagenomic approaches might provide us with a glimpse into the characteristics of sulfur oxidizers in marine sediments.

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Detection of Representative Enteropathogenic Bacteria, Vibrio spp., Pathogenic Escherichia coli, Salmonella spp., Shigella spp., and Yersinia enterocolitica, Using a Virulence Factor Gene-Based Oligonucleotide Microarray§
Dong-Hun Kim , Bok-Kwon Lee , Yong-Dae Kim , Sung-Keun Rhee , Young-Chang Kim
J. Microbiol. 2010;48(5):682-688.   Published online November 3, 2010
DOI: https://doi.org/10.1007/s12275-010-0119-5
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AbstractAbstract PDF
Rapid identification of enteropathogenic bacteria in stool samples is critical for clinical diagnosis and antimicrobial therapy. In this study, we describe the development of an approach that couples multiplex PCR with hybridization to a DNA microarray, to allow the simultaneous detection of the 10 pathogens. The microarray was synthesized with 20-mer oligonucleotide probes that were designed to be specific for virulencefactor genes of each strain. The detection limit for genomic DNA from a single strain was approximately 10 fg. In the presence of heterogeneous non-target DNA, the detection sensitivity of the array decreased to approximately 100 fg. We did not observe any non-specific hybridization. In addition, we successfully used this oligonucleotide-based DNA microarray to identify the causative agents in clinical stool samples from patients with food-borne enteritis.

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Isolation, Characterization, and Abundance of Filamentous Members of Caldilineae in Activated Sludge
Dae-No Yoon , Soo-Je Park , So-Jeong Kim , Che Ok Jeon , Jong-Chan Chae , Sung-Keun Rhee
J. Microbiol. 2010;48(3):275-283.   Published online June 23, 2010
DOI: https://doi.org/10.1007/s12275-010-9366-8
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AbstractAbstract PDF
Chloroflexi are currently believed to serve as backbone forming agents in the activated sludge of wastewater treatment plants (WWTPs). In this study, we isolated and characterized filamentous bacteria in the class Caldilineae of the phylum Chloroflexi in municipal WWTPs. Diversity analysis using Chloroflexi-specific 16S rRNA gene clone libraries showed that 97% of the clones belonged to the subdivision Anaerolineae comprising the two classes Anaerolineae (95%) and Caldilineae (2%). Clones of Caldilineae were related to a thermophilic filament Caldilinea aerophila with 93% 16S rRNA gene sequence similarity. We obtained filamentous isolates classified into the class Caldilineae showing the best match to C. aerophila with 89% 16S rRNA gene sequence similarity. Isolates showed no ability to assimilate glucose or N-acetylglucosamine or to degrade biopolymers which were observed in filamentous Chloroflexi of WWTPs. The assessment of relative abundance based on quantitative PCR of the 16S rRNA gene indicated that members of the class Caldilineae comprised 12-19% of the Chloroflexi in the activated sludge. Additionally, fluorescence in situ hybridization experiments showed that diverse filamentous Caldilineae inhabit the activated sludge of municipal WWTPs. These findings yield insight into the role of filamentous mesophilic Caldilinea in stabilizing flocs of activated sludge in a wide range of WWTPs.

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Microeukaryotic Diversity in Marine Environments, an Analysis of Surface Layer Sediments from the East Sea
Soo-Je Park , Byoung-Joon Park , Vinh Hoa Pham , Dae-No Yoon , Si-Kwan Kim , Sung-Keun Rhee
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DOI: https://doi.org/10.1007/s12275-007-0237-x
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AbstractAbstract PDF
Molecular techniques, based on clone library of 18S rRNA gene, were employed to ascertain the diversity of microeukaryotic organisms in sediments from the East Sea. A total of 261 clones were recovered from surface sediments. Most of the clone sequences (90%) were affiliated with protists, dominated by Ciliates (18%) and Dinoflagellates (19%) of Alveolates, phototrophic Stramenopiles (11%), and Cercozoa (20%). Many of the clones were related to uncultivated eukaryotes clones retrieved from anoxic environments with several highly divergent 18S rRNA gene sequences. However, no clones were related to cultivated obligate anaerobic protists. Protistan communities between subsurface layers of 1 and 9 cm shared 23% of total phylotypes which comprised 64% of total clones retrieved. Analysis of diversity indices and rarefaction curve showed that the protistan community within the 1 cm layer exhibited higher diversity than the 9 cm layer. Our results imply that diverse protists remain to be uncovered within marine benthic environments.

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Characterization of the Depth-Related Changes in the Microbial Communities in Lake Hovsgol Sediment by 16S rRNA Gene-Based Approaches
Young-Do Nam , Youlboong Sung , Ho-Won Chang , Seong Woon Roh , Kyoung-Ho Kim , Sung-Keun Rhee , Jung-Chan Kim , Joo-Yong Kim , Jung-Hoon Yoon , Jin-Woo Bae
J. Microbiol. 2008;46(2):125-136.   Published online June 11, 2008
DOI: https://doi.org/10.1007/s12275-007-0189-1
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AbstractAbstract PDF
The undisturbed sediment of Lake Hovsgol (Mongolia) is scientifically important because it represents a record of the environmental changes that took place between the Holocene (the present age) and Pleistocene (the last ice age; 12,000 14C years before present day). Here, we investigated how the current microbial <br>communities change as the depth increases by PCR-denaturing gradient gel electrophoresis (DGGE) analysis of the 16S rRNA genes of the microbial communities. The microbial diversity, as estimated by the Shannon index, decreased as the depth increased. In particular, significant changes in archaeal diversity were observed in the middle depth (at 39~42 cm depth of total 60 cm depth) that marks the border between the Holocene and Pleistocene. Phylotype belonging to Beta- and Gamma-Proteobacteria were the predominant bacteria and most of these persisted throughout the depth examined. However, as the depth increased, some bacteria <br>(some genera belonging to Beta-Proteobacteria, Nitrospira, and OP8-9) were not detectable while others (some genera belonging to Alpha-, Beta-, Gamma-Proteobacteria) newly deteced by DGGE. Crenarchaea were the predominant archaea and only one phylotype belonging to Euryarchaea was found. Both the <br>archaeal and bacterial profiles revealed by the DGGE band patterns could be grouped into four and three subsets, respectively, subsets that were largely divided by the border between the Holocene and Pleistocene. Thus, the diversity of the current microbial communities in Lake Hovsgol sediments decreases with increasing <br>depth. These changes probably relate to the environmental conditions in the sediments, which were shaped by the paleoclimatic events taking place between the Holocene and Pleistocene.
Sung-Keun Rhee 1 Article
Genomic profiling of soil nitrifying microorganisms enriched on floating membrane filter
Christiana Abiola, Joo-Han Gwak, Ui-Ju Lee, Aderonke Odunayo Adigun, Sung-Keun Rhee
J. Microbiol. 2025;63(4):e2502002.   Published online April 29, 2025
DOI: https://doi.org/10.71150/jm.2502002
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AbstractAbstract PDFSupplementary Material

Recently, floating membrane filter cultivation was adopted to simulate solid surface and enrich surface-adapted soil ammonia-oxidizing archaea (AOA) communities from agricultural soil, as opposed to the conventional liquid medium. Here, we conducted metagenomic sequencing to recover nitrifier bins from the floating membrane filter cultures and reveal their genomic properties. Phylogenomic analysis showed that AOA bins recovered from this study, designated FF_bin01 and FF_bin02, are affiliated with the Nitrososphaeraceae family, while the third bin, FF_bin03, is a nitrite-oxidizing bacterium affiliated with the Nitrospiraceae family. Based on the ANI/AAI analysis, FF_bin01 and FF_bin02 are identified as novel species within the genera “Candidatus Nitrosocosmicus” and Nitrososphaera, respectively, while FF_bin03 represents a novel species within the genus Nitrospira. The pan and core genome analysis for the 29 AOA genomes considered in this study revealed 5,784 orthologous clusters, out of which 653 were core orthologous clusters. Additionally, 90 unique orthologous clusters were conserved among the Nitrososphaeraceae family, suggesting their potential role in enhancing culturability and adaptation to diverse environmental conditions. Intriguingly, FF_bin01 and FF_bin02 harbor a gene encoding manganese catalase and FF_bin03 also possesses a heme catalase gene, which might enhance their growth on the floating membrane filter. Overall, the floating membrane filter cultivation has proven to be a promising approach for isolating distinct soil AOA, and further modifications to this technique could stimulate the growth of a broader range of uncultivated nitrifiers from diverse soil environments.


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