- Identification and characterization of a marine-derived chitinolytic fungus, Acremonium sp. YS2-2
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Dawoon Chung , Kyunghwa Baek , Seung Seob Bae , Jaejoon Jung
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J. Microbiol. 2019;57(5):372-380. Published online February 26, 2019
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DOI: https://doi.org/10.1007/s12275-019-8469-0
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Chitin is the most abundant biopolymer in marine environments.
To facilitate its utilization, our laboratory screened
marine-derived fungal strains for chitinolytic activity. One
chitinolytic strain isolated from seawater, designated YS2-2,
was identified as Acremonium species based on morphological
and phylogenetic analyses. Acremonium species are cosmopolitan
fungi commonly isolated from both terrestrial and
marine environments, but their chitinolytic activity is largely
unknown. The extracellular crude enzyme of YS2-2 exhibited
optimum chitinolytic activity at pH 6.0–7.6, 23–45°C, and
1.5% (w/v) NaCl. Degenerate PCR revealed the partial cDNA
sequence of a putative chitinase gene, chiA, in YS2-2. The
expression of chiA was dramatically induced in response to
1% (w/v) colloidal chitin compared to levels under starvation,
chitin powder, and glucose conditions. Moreover, the chiA
transcript levels were positively correlated with chitinolytic
activities under various colloidal chitin concentrations, suggesting
that ChiA mediates chitinolytic activity in this strain.
Our results provide a basis for additional studies of marinederived
chitinolytic fungi aimed at improving industrial applications.
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Citations
Citations to this article as recorded by  - Isolation and Characterization of a Nitrilase-Producing Geotrichum Strain and Optimization of the Fermentation Conditions
Huaiyuan Zhang, Meijun Tao, Yiwen Fan, Jiazi Zhang, Juan Zhang, Zhibin Feng
Current Microbiology.2025;[Epub] CrossRef - Characterization of L-Asparaginase Free of L-Glutaminase and Urease Activity Produced by the Marine Paraconiothyrium cyclothyrioides Strain MABIK FU00000820
Woon-Jong Yu, Ha Young Lee, Yong Min Kwon, Seung Seob Bae, Hyun-Ju Hwang, Dawoon Chung
Applied Microbiology.2025; 5(3): 100. CrossRef -
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(
Hypocreales, Sordariomycetes
), a New Species from Oak (
Quercus
spp.) Growing in Algeria
Alla Eddine Mahamedi, Milan Spetik, Muhammed Namseed Padinhar Ismail, Fouad Lamghari, Ales Eichmeier, Akila Berraf-Tebbal
Mycobiology.2025; 53(5): 717. CrossRef - Performance of aerobic denitrifying fungal community for promoting nitrogen reduction and its application in drinking water reservoirs
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Journal of Environmental Management.2024; 351: 119842. CrossRef - Pannorin isolated from marine Penicillium sp. SG-W3: a selective monoamine oxidase A inhibitor
Jong Min Oh, Qian Gao, Woong-Hee Shin, Eun-Young Lee, Dawoon Chung, Grace Choi, Sang-Jip Nam, Hoon Kim
Applied Biological Chemistry.2024;[Epub] CrossRef - The potential of degrading natural chitinous wastes to oligosaccharides by chitinolytic enzymes from two Talaromyces sp. isolated from rotten insects (Hermetia illucens) under solid state fermentation
Xunfan Wei, Zhuoxiao Sui, Mengyuan Guo, Sicong Chen, Zongqi Zhang, Jin Geng, Jinhua Xiao, Dawei Huang
Brazilian Journal of Microbiology.2023; 54(1): 223. CrossRef - Microbial chitinases and their relevance in various industries
Deepali Thakur, Anjali Chauhan, Prakriti Jhilta, Rajesh Kaushal, Bhawna Dipta
Folia Microbiologica.2023; 68(1): 29. CrossRef - An overview of fungal chitinases and their potential applications
Deepali Thakur, Aarti Bairwa, Bhawna Dipta, Prakriti Jhilta, Anjali Chauhan
Protoplasma.2023; 260(4): 1031. CrossRef - Characterization and Biological Activities of Yeasts Isolated from Marine Environments
Woon-Jong Yu, Dawoon Chung, Seung Seob Bae, Yong Min Kwon, Eun-Seo Cho, Grace Choi
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Abhaya Dayini Behera, Surajit Das
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Xue-Bing Ren, Yan-Ru Dang, Sha-Sha Liu, Ke-Xuan Huang, Qi-Long Qin, Xiu-Lan Chen, Yu-Zhong Zhang, Yan-Jun Wang, Ping-Yi Li
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Bin He, Liyan Yang, Dengfeng Yang, Minguo Jiang, Chengjin Ling, Hailan Chen, Feng Ji, Lixia Pan
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Zhi-kui Hao, Jian-song Li, Dan-hua Wang, Fei He, Jing-shi Xue, Liang-hong Yin, Hua-bao Zheng
Biotechnology Letters.2022; 44(4): 623. CrossRef - Polyextremophilic Chitinolytic Activity by a Marine Strain (IG119) of Clonostachys rosea
Marcella Pasqualetti, Susanna Gorrasi, Valeria Giovannini, Martina Braconcini, Massimiliano Fenice
Molecules.2022; 27(3): 688. CrossRef - Characterization of Chitinolytic and Antifungal Activities in Marine-Derived Trichoderma bissettii Strains
Dawoon Chung, Yong Min Kwon, Ji Yeon Lim, Seung Sub Bae, Grace Choi, Dae-Sung Lee
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Xing-Huan Xie, Xin Fu, Xing-Yu Yan, Wen-Fang Peng, Li-Xin Kang
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Yong Min Kwon, Seung Sub Bae, Grace Choi, Ji Yeon Lim, Yoon-Hee Jung, Dawoon Chung
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Dawoon Chung, Yong Min Kwon, Youngik Yang
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Jia Tian, Chao Sun, Pengpeng Lu, Fei Li, Yiqing Shangguan, Fan Qi
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Ahlem Maamar, Marie-Elisabeth Lucchesi, Stella Debaets, Nicolas Nguyen van Long, Maxence Quemener, Emmanuel Coton, Mohammed Bouderbala, Gaëtan Burgaud, Amaria Matallah-Boutiba
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Yong Min Kwon, Hyun Seok Choi, Ji Yeon Lim, Hyeong Seok Jang, Dawoon Chung
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Marcella Pasqualetti, Paolo Barghini, Valeria Giovannini, Massimiliano Fenice
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- Effects of Nutritional Input and Diesel Contamination on Soil Enzyme Activities and Microbial Communities in Antarctic Soils
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Jiwon Han , Jaejoon Jung , Seunghun Hyun , Hyun Park , Woojun Park
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J. Microbiol. 2012;50(6):916-924. Published online December 30, 2012
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DOI: https://doi.org/10.1007/s12275-012-2636-x
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178
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22
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Abstract
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Pollution of Antarctic soils may be attributable to increased nutritional input and diesel contamination via anthropogenic activities. To investigate the effect of these environmental changes on the Antarctic terrestrial ecosystem, soil enzyme activities and microbial communities in 3 types of Antarctic soils were evaluated. The activities of alkaline phosphomonoesterase and dehydrogenase were dramatically increased, whereas the activities of β-glucosidase, urease, arylsulfatase, and fluorescein diacetate hydrolysis were negligible. Alkaline phosphomonoesterase and dehydrogenase activities in the 3 types of soils increased 3- to 10-fold in response to nutritional input, but did not increase in the presence of diesel
contamination. Consistent with the enzymatic activity data, increased copy numbers of the phoA gene, encoding an alkaline phosphomonoesterase, and the 16S rRNA gene were verified using quantitative real-time polymerase chain reaction.
Interestingly, dehydrogenase activity and 16S rRNA gene copy number increased slightly after 30 days, even under diesel contamination, probably because of adaptation of the bacterial population. Intact Antarctic soils showed a predominance
of Actinobacteria phylum (mostly Pseudonorcarida species) and other phyla such as Proteobacteria, Chloroflexi, Planctomycetes, Firmicutes, and Verrucomicrobia were present in successively lower proportions. Nutrient addition might act
as a selective pressure on the bacterial community, resulting in the prevalence of Actinobacteria phylum (mostly Arthrobacter species). Soils contaminated by diesel showed a predominance of Proteobacteria phylum (mostly Phyllobacterium species), and other phyla such as Actinobacteria, Bacteroidetes, Planctomycetes, and Gemmatimonadetes were present in successively lower proportions. Our data reveal that nutritional input has a dramatic impact on bacterial communities in Antarctic soils and that diesel contamination is likely toxic to enzymes in this population.
- NOTE] Pedobacter jeongneungensis sp. nov., Isolated from Forest Soil
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Jaejoon Jung , Woojun Park
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J. Microbiol. 2012;50(4):660-664. Published online July 21, 2012
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DOI: https://doi.org/10.1007/s12275-012-1629-0
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309
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8
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Abstract
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Strain BH45T was isolated from forest soil of Mt. Bukhan in Jeongneung, Seoul, Korea. The Gram-staining-negative strain BH45T grows at 4–30°C (optimum of 25–30°C) and between pH 5–8 (optimum of pH 6–8). Its major cellular fatty acids are C18:3 ω6c (6,9,12) and C10:0. The G+C content of genomic DNA was 40.2 mol%. The major respiratory quinone system in strain BH45T is menaquinone-7. Phylogenetic analysis based on 16S rRNA gene sequences indicates that strain BH45T is closely related to the genus Pedobacter. Sequence similarities with P. terrae KCTC 12762T, P. suwonensis KACC 11317T, P. soli KACC 14939T, P. alluvionis DSM 19624T, P. roseus KCCM 42272T, P. yonginense KCTC 22721T were 97.5, 97.1, 97.0, 97.0, 97.0, and 96.0%, respectively. DNA-DNA hybridization results distinguish strain BH45T from two Pedobacter species with high 16S rRNA gene sequence similarities. According to the phenotypic and molecular data, the strain BH45T clearly represents a novel species within the genus Pedobacter; thus, the name Pedobacter jeongneungensis sp. nov. is proposed for this strain. The type strain is BH45T (=KACC 15514T =JCM 17626T).
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Citations
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- Seasonal Changes in Nitrogen-Cycle Gene Abundances and in Bacterial Communities in Acidic Forest Soils
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Jaejoon Jung , Jinki Yeom , Jiwon Han , Jisun Kim , Woojun Park
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J. Microbiol. 2012;50(3):365-373. Published online June 30, 2012
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DOI: https://doi.org/10.1007/s12275-012-1465-2
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277
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34
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Abstract
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The abundance of genes related to the nitrogen biogeochemical cycle and the microbial community in forest soils (bacteria, archaea, fungi) were quantitatively analyzed via real-time PCR using 11 sets of specific primers amplifying nifH, bacterial amoA, archaeal amoA, narG, nirS, nirK, norB, nosZ, bacterial 16S rRNA gene, archaeal 16S rRNA gene, and the ITS sequence of fungi. Soils were sampled from Bukhan Mountain from September of 2010 to July of 2011 (7 times). Bacteria were the predominant microbial community in all samples. However, the abundance of archaeal amoA was greater than bacterial amoA throughout the year. The abundances of nifH, nirS, nirK, and norB genes changed in a similar pattern, while narG and nosZ appeared in sensitive to the environmental changes. Clone libraries of bacterial 16S rRNA genes were constructed from summer and winter soil samples and these revealed that Acidobacteria was the most predominant phylum in acidic forest soil environments in both samples. Although a specific correlation of environmental factor and gene abundance was not verified by principle component analysis, our data suggested that the combination of biological, physical, and chemical characteristics of forest soils created distinct conditions favoring the nitrogen biogeochemical cycle and that bacterial communities in undisturbed acidic forest soils were quite stable during seasonal change.
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- Physiological and Metabolic Responses for Hexadecane Degradation in Acinetobacter oleivorans DR1
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Jaejoon Jung , Jaemin Noh , Woojun Park
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J. Microbiol. 2011;49(2):208-215. Published online May 3, 2011
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DOI: https://doi.org/10.1007/s12275-011-0395-8
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The hexadecane degradation of Acinetobacter oleivorans DR1 was evaluated with changes in temperature and ionic salt contents. Hexadecane degradation of strain DR1 was reduced markedly by the presence of sodium chloride (but not potassium chloride). High temperature (37°C) was also shown to inhibit the motility, biofilm formation, and hexadecane biodegradation. The biofilm formation of strain DR1 on the oil-water interface might prove to be a critical physiological feature for the degradation of hexadecane. The positive relationship between biofilm formation and hexadecane degradation could be observed at 30°C, but not at low temperatures (25°C). Alterations in cell hydrophobicity and EPS production by temperature and
salts were not correlated with biofilm formation and hexadecane degradation. Our proteomic analyses have demonstrated that metabolic changes through the glyoxylate pathway are important for efficient degradation of hexadecane. Proteins involved in fatty acid metabolism, gluconeogenesis, and oxidative stress defense
proteins appear to be highly expressed during biodegradation of hexadecane. These results suggested that biofilm formation and oxidative stress defense are important physiological responses for hexadecane degradation along with metabolic switch to glyoxylate pathway in strain DR1.
- Acinetobacter oleivorans sp. nov. Is Capable of Adhering to and Growing on Diesel-Oil
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Yoon-Suk Kang , Jaejoon Jung , Che Ok Jeon , Woojun Park
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J. Microbiol. 2011;49(1):29-34. Published online March 3, 2011
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DOI: https://doi.org/10.1007/s12275-011-0315-y
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361
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55
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A diesel-oil and n-hexadecane-degrading novel bacterial strain, designated DR1T, was isolated from a rice paddy in Deok-So, South Korea. The strain DR1T cells were Gram-negative, aerobic coccobacilli, and grew at 20-37°C with the optimal temperature of 30°C, and an optimal pH of 6-8. Interestingly, strain DR1T was highly motile (swimming and swarming motility) using its fimbriae, and generated N-acyl homoserine lactones as quorum-sensing signals. The predominant respiratory quinone as identified as ubiquinone-9 (Q-9) and DNA G+C content was 41.4 mol%. Comparative 16S rRNA gene sequence-based phylogenetic analysis placed the strain in a clade with the species A. calcoaceticus, A. haemolyticus, A. baumannii, A. baylyi, and A. beijerinckii, with which it evidenced sequence similarities of 98.2%, 97.4%, 97.2%, 97.1%, and 97.0%, respectively. DNA-DNA hybridization values between strain DR1T and other Acinetobacter spp. were all less than 20%. The physiological and taxonomic characteristics with the DNA-DNA hybridization data supported the identification of strain DR1T in the genus Acinetobacter as a novel species, for which the name Acinetobacter oleivorans sp. nov. is proposed. The type strain is DR1T (=KCTC 23045T =JCM 16667T).
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Citations
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Wanli Peng, Xiuli Wang, Qinchen Liu, Zhihong Xiao, Fulin Li, Nannan Ji, Zhuo Chen, Jiaying He, Junhao Wang, Zixin Deng, Shuangjun Lin, Rubing Liang
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Synergistic co-metabolism enhancing the crude oil degradation by
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Applied Microbiology and Biotechnology.2014; 98(11): 5039. CrossRef - Plasmid-Encoded Tetracycline Efflux Pump Protein Alters Bacterial Stress Responses and Ecological Fitness of Acinetobacter oleivorans
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PLoS ONE.2014; 9(9): e107716. CrossRef - Acinetobacter nectaris sp. nov. and Acinetobacter boissieri sp. nov., isolated from floral nectar of wild Mediterranean insect-pollinated plants
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