Journal of Microbiology

Journal Articles

miR-135b Aggravates Fusobacterium nucleatum-Induced Cisplatin Resistance in Colorectal Cancer by Targeting KLF13: Wei Zeng , Jia Pan , Guannan Ye; J. Microbiol. 2024;62(2):63-73. Published online February 24, 2024; DOI: https://doi.org/10.1007/s12275-023-00100-1

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Cisplatin resistance is the main cause of colorectal cancer (CRC) treatment failure, and the cause has been reported to be related to Fusobacterium nucleatum (Fn) infection. In this study, we explored the role of Fn in regulating cisplatin resistance of CRC cells and its underlying mechanism involved. The mRNA and protein expressions were examined by qRT-PCR and western blot. Cell proliferation and cell apoptosis were assessed using CCK8 and flow cytometry assays, respectively. Dual-luciferase reporter gene assay was adopted to analyze the molecular interactions. Herein, our results revealed that Fn abundance and miR-135b expression were markedly elevated in CRC tissues, with a favorable association between the two. Moreover, Fn infection could increase miR-135b expression via a concentration-dependent manner, and it also enhanced cell proliferation but reduced apoptosis and cisplatin sensitivity by upregulating miR-135b. Moreover, KLF13 was proved as a downstream target of miR-135b, of which overexpression greatly diminished the promoting effect of miR-135b or Fn-mediated cisplatin resistance in CRC cells. In addition, it was observed that upstream 2.5 kb fragment of miR-135b promoter could be interacted by β-catenin/TCF4 complex, which was proved as an effector signaling of Fn. LF3, a blocker of β-catenin/TCF4 complex, was confirmed to diminish the promoting role of Fn on miR-135b expression. Thus, it could be concluded that Fn activated miR-135b expression through TCF4/β-catenin complex, thereby inhibiting KLF13 expression and promoting cisplatin resistance in CRC.

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miR-135b: A key role in cancer biology and therapeutic targets
Yingchun Shao, Shuangshuang Zhang, Yuxin Pan, Zhan Peng, Yinying Dong
Non-coding RNA Research.2025; 12: 67. CrossRef
miR‐135b: A Potential Biomarker for Pathological Diagnosis and Biological Therapy
Dezhi Yan, Qingliu He, Chunjian Wang, Tian Li, Xueping Yi, Haisheng Yu, Wenfei Wu, Hanyun Yang, Wenzhao Wang, Liang Ma
WIREs RNA.2025;[Epub] CrossRef
Emerging roles of intratumor microbiota in cancer: tumorigenesis and management strategies
Zhuangzhuang Shi, Zhaoming Li, Mingzhi Zhang
Journal of Translational Medicine.2024;[Epub] CrossRef
Fusobacterium nucleatum: a novel regulator of antitumor immune checkpoint blockade therapy in colorectal cancer
Mengjie Luo
American Journal of Cancer Research.2024; 14(8): 3962. CrossRef
Antioxidant Role of Probiotics in Inflammation-Induced Colorectal Cancer
Sevag Hamamah, Andrei Lobiuc, Mihai Covasa
International Journal of Molecular Sciences.2024; 25(16): 9026. CrossRef
Identification of Penexanthone A as a Novel Chemosensitizer to Induce Ferroptosis by Targeting Nrf2 in Human Colorectal Cancer Cells
Genshi Zhao, Yanying Liu, Xia Wei, Chunxia Yang, Junfei Lu, Shihuan Yan, Xiaolin Ma, Xue Cheng, Zhengliang You, Yue Ding, Hongwei Guo, Zhiheng Su, Shangping Xing, Dan Zhu
Marine Drugs.2024; 22(8): 357. CrossRef

Tubulysins are Essential for the Preying of Ciliates by Myxobacteria: Uisang Yu , Jiha Kim , Seohui Park , Kyungyun Cho; J. Microbiol. 2023;61(6):627-632. Published online June 14, 2023; DOI: https://doi.org/10.1007/s12275-023-00056-2

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Abstract

Tubulysins are bioactive secondary metabolites produced by myxobacteria that promote microtubule disassembly. Microtubules are required for protozoa such as Tetrahymena to form cilia and flagella. To study the role of tubulysins in myxobacteria, we co-cultured myxobacteria and Tetrahymena. When 4000 Tetrahymena thermophila and 5.0 × 108 myxobacteria were added to 1 ml of CYSE medium and co-cultured for 48 h, the population of T. thermophila increased to more than 75,000. However, co-culturing tubulysin-producing myxobacteria, including Archangium gephyra KYC5002, with T. thermophila caused the population of T. thermophila to decrease from 4000 to less than 83 within 48 h. Almost no dead bodies of T. thermophila were observed in the culture medium. Co-culturing of T. thermophila and the A. gephyra KYC5002 strain with inactivation of the tubulysin biosynthesis gene led to the population of T. thermophila increasing to 46,667. These results show that in nature, most myxobacteria are preyed upon by T. thermophila, but some myxobacteria prey on and kill T. thermophila using tubulysins. Adding purified tubulysin A to T. thermophila changed the cell shape from ovoid to spherical and caused cell surface cilia to disappear.

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Tubulysin Production by the Dead Cells of Archangium gephyra KYC5002
Seohui Park, Chaehyeon Park, Yujin Ka, Kyungyun Cho
Journal of Microbiology.2024; 62(6): 463. CrossRef
Two reasons to kill: predation and kin discrimination in myxobacteria
Christine Kaimer, Michael L. Weltzer, Daniel Wall
Microbiology .2023;[Epub] CrossRef

Saccharibacillus brassicae sp. nov., an endophytic bacterium isolated from kimchi cabbage (Brassica rapa subsp. pekinensis) seeds: Lingmin Jiang , Chan Ju Lim , Song-Gun Kim , Jae Cheol Jeong , Cha Young Kim , Dae-Hyuk Kim , Suk Weon Kim , Jiyoung Lee; J. Microbiol. 2020;58(1):24-29. Published online November 25, 2019; DOI: https://doi.org/10.1007/s12275-020-9346-6

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Abstract

Strain ATSA2T was isolated from surface-sterilized kimchi cabbage (Brassica rapa subsp. pekinensis) seeds and represents a novel bacterium based on the polyphasic taxonomic approach. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain ATSA2T formed a lineage within genus Saccharibacillus and was most closely to Saccharibacillus deserti WLG055T (98.1%) and Saccharibacillus qingshengii H6T (97.9%). The whole-genome of ATSA2T comprised a 5,619,468 bp of circular chromosome with 58.4% G + C content. The DNA-DNA relatedness values between strain ATSA2T and its closely related type strains S. deserti WLJ055T and S. qingshengii H6T were 26.0% and 24.0%, respectively. Multiple gene clusters associated with plant growth promotion activities (stress response, nitrogen and phosphorus metabolism, and auxin biosynthesis) were annotated in the genome. Strain ATSA2T was Gram-positive, endospore-forming, facultatively anaerobic, and rod-shaped. It grew at 15–37°C (optimum 25°C), pH 6.0–10.0 (optimum pH 8.0), and in the presence of 0–5% (w/v) NaCl (optimum 1%). The major cellular fatty acids (> 10%) of strain ATSA2T were anteiso- C15:0 and C16:0. MK-7 was the major isoprenoid quinone. The major polar lipids present were diphosphatidylglycerol, phosphatidylglycerol, and three unknown glycolipids. Based on its phylogenetic, genomic, phenotypic, and chemotaxonomic features, strain ATSA2T is proposed to represent a novel species of genus Saccharibacillus, for which the name is Saccharibacillus brassicae sp. nov. The type strain is ATSA2T (KCTC 43072T = CCTCC AB 2019223T).

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Improving plant salt tolerance through Algoriphagus halophytocola sp. nov., isolated from the halophyte Salicornia europaea
Yuxin Peng, Dong Hyun Cho, Zalfa Humaira, Yu Lim Park, Ki Hyun Kim, Cha Young Kim, Jiyoung Lee
Frontiers in Microbiology.2024;[Epub] CrossRef
Dasania phycosphaerae sp. nov., isolated from phytoplankton sample from the south coast of the Republic of Korea
Yue Jiang, Yong Guan, Sungmo Kang, Mi-Kyung Lee, Ki-Hyun Kim, Zhun Li
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Genome insights into the plant growth-promoting bacterium Saccharibacillus brassicae ATSA2T
Lingmin Jiang, Jiyoon Seo, Yuxin Peng, Doeun Jeon, Soon Ju Park, Cha Young Kim, Pyoung Il Kim, Chul Hong Kim, Ju Huck Lee, Jiyoung Lee
AMB Express.2023;[Epub] CrossRef
Emticicia fluvialis sp. nov., a potential hormone-degrading bacterium isolated from Nakdong River, Republic of Korea
Hyun-Sun Baek, Yong Guan, Min-Ju Kim, Yue Jiang, Mi-Kyung Lee, Ki-Hyun Kim, Jaeyoon Lee, Yuna Shin, Yoon-Ho Kang, Zhun Li
Antonie van Leeuwenhoek.2023; 116(12): 1317. CrossRef
Identification and genomic analysis of Pseudosulfitobacter koreense sp. nov. isolated from toxin-producing dinoflagellate Alexandrium pacificum
Yue Jiang, Zhun Li
Archives of Microbiology.2023;[Epub] CrossRef
Gymnodinialimonas phycosphaerae sp. nov., a phycosphere bacterium isolated from Karlodinium veneficum
Yuxin Peng, Lingmin Jiang, Yue Jiang, Jiyoon Seo, Doeun Jeon, Young-Min Kim, Zhun Li, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Flavobacterium endoglycinae sp. nov., an endophytic bacterium isolated from soybean (Glycine max L. cv. Gwangan) stems
Jiyoon Seo, Yuxin Peng, Lingmin Jiang, Sang-Beom Lee, Rae-Dong Jeong, Soon Ju Park, Cha Young Kim, Man-Soo Choi, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Gymnodinialimonas ceratoperidinii gen. nov., sp. nov., isolated from rare marine dinoflagellate Ceratoperidinium margalefii
Yue Jiang, Yuxin Peng, Hyeon Ho Shin, Hyun Jung Kim, Ki-Hyun Kim, Lingmin Jiang, Jiyoung Lee, Zhun Li
Archives of Microbiology.2022;[Epub] CrossRef
Flagellatimonas centrodinii gen. nov., sp. nov., a novel member of the family Nevskiaceae isolated from toxin-producing dinoflagellate Centrodinium punctatum
Yue Jiang, Lingmin Jiang, Yuxin Peng, Ki-Hyun Kim, Hyeon Ho Shin, Young-Min Kim, Jiyoung Lee, Zhun Li
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
Pedobacter endophyticus sp. nov., an endophytic bacterium isolated from Carex pumila
Yuxin Peng, Lingmin Jiang, Jiyoon Seo, Zhun Li, Hanna Choe, Jae Cheol Jeong, Suk Weon Kim, Young-Min Kim, Cha Young Kim, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
Neobacillus endophyticus sp. nov., an endophytic bacterium isolated from Selaginella involvens roots
Lingmin Jiang, Myoung Hui Lee, Jae Cheol Jeong, Dae-Hyuk Kim, Cha Young Kim, Suk Weon Kim, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2019;[Epub] CrossRef

Fulvimarina endophytica sp. nov., a novel endophytic bacterium isolated from bark of Sonneratia caseolaris: Li Tuo , Xiao-Rui Yan; J. Microbiol. 2019;57(8):655-660. Published online June 11, 2019; DOI: https://doi.org/10.1007/s12275-019-8627-4

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Abstract

A Gram-negative, aerobic, short-rod-shaped, motile (with a terminal flagellum), non-spore-forming bacterium, designated strain 85T, was isolated from a surface-sterilized bark of Sonneratia caseolaris collected from Qinzhou in Guangxi, China and was analyzed using a polyphasic approach to determine its taxonomic position. Strain 85T grew optimally in the presence of 1–2% (w/v) NaCl at 30°C and pH 6.0–7.0. Phylogenetic analysis based on 16S rRNA gene sequence suggested that strain 85T belonged to the genus Fulvimarina and shared the highest 16S rRNA gene sequence similarity with Fulvimarina pelagi HTCC2506T (96.16%). The cell-wall peptidoglycan contained meso-diaminopimelic acid and ubiquinone Q-10 was the predominant respiratory lipoquinone. The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, an unidentified amino lipid, three unidentified phospholipids and six unidentified lipids. The major fatty acid was C18:1 ω7c. The DNA G+C content of strain 85T was 65.4 mol%, and the average nucleotide identity and estimated DDH values between strain 85T and the type strain of Fulvimarina pelagi HTCC2506T were 77.3% and 21.7%, respectively. Based on the phylogenetic, phenotypic, and chemotaxonomic analyses, strain 85T should be considered as a novel species of the genus Fulvimarina with the proposed name Fulvimarina endophytica sp. nov., and its type strain is 85T (= KCTC 62717T = CGMCC 1.13665T).

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Description and genomic characterization of Mangrovibrevibacter kandeliae gen. nov. sp. nov., a novel carotenoid-producing endophytic bacterium isolated from branch of mangrove plants
Chengshao Zan, Zhouqing Zheng, Xiaohui Chen, Mingsheng Chen, Feina Li, Li Tuo
Antonie van Leeuwenhoek.2025;[Epub] CrossRef
Fulvimarina uroteuthidis sp. nov., isolated from a marine invertebrate and Uroteuthis (Photololigo) edulis
Yea-Lin Moon, Kyung Hyun Kim, Jin-Sook Park
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Bacterial communities vary across populations and tissue type in red mangroves (Rhizophora mangle, Rhizophoraceae) along an expanding front
Brendan P Scherer, Olivia U Mason, Austin R Mast
FEMS Microbiology Ecology.2022;[Epub] 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

Aeromicrobium endophyticum sp. nov., an endophytic actinobacterium isolated from reed (Phragmites australis): Fei-Na Li , Shui-Lin Liao , Shao-Wei Liu , Tao Jin , Cheng-Hang Sun; J. Microbiol. 2019;57(9):725-731. Published online May 23, 2019; DOI: https://doi.org/10.1007/s12275-019-8705-7

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Abstract

A Gram-staining-positive, motile and short-rod-shaped actinobacterium designated 9W16Y-2T was isolated from surface- sterilized leaves of reed (Phragmites australis) collected from Taklamakan Desert in Xinjiang Uygur Autonomous Region, China. Colonies were pale greenish yellow, circular, smooth, and convex. The 16S rRNA gene sequence of strain 9W16Y-2T exhibited highest sequence similarities with Aeromicrobium camelliae CGMCC 1.12942T (99.0%) and Aeromicrobium erythreum NRRL B-3381T (97.2%). Phylogenetic analyses based on 16S rRNA gene sequences and single-copy phylogenetic marker genes (pMGs) showed that strain 9W16Y- 2T belonged to the genus Aeromicrobium and formed a monophyletic clade with Aeromicrobium camelliae CGMCC 1.12942T. Furthermore, average nucleotide identity (ANI) and DNA-DNA hybridization (DDH) clearly separated strain 9W16Y-2T from the other species of the genus Aeromicrobium with values below the thresholds for species delineation. The G+C content of the genomic DNA is 68.9 mol%. The diagnostic diamino acid of the cell-wall peptidoglycan was LLdiaminopimelic acid. The predominant menaquinone was MK-9(H4). The major fatty acids (> 10% of the total fatty acids) were C18:0 10-methyl (TBSA) (28.2%), C16:0 (21.0%), C16:0 2-OH (20.8%) and C18:1 ω9c (12.8%). The polar lipid profile comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, phosphatidylinositol, an unidentified aminophospholipid and an unidentified lipid. Based on the phylogenic, phenotypic and chemotaxonomic features, strain 9W16Y-2T represents a novel species of the genus Aeromicrobium, for which the name Aeromicrobium endophyticum sp. nov. is proposed. The type strain is 9W16Y-2T (= CGMCC 1.13876T = JCM 33141T).

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Solibacillus palustris sp. nov., isolated from wetland soil of ecology park
Jung-Hun Jo, Soon-Youl Lee, Moon-Soo Rhee, Kang-Hyun Lee, Se-Yoon Chun, Wan-Taek Im
International Journal of Systematic and Evolutionary Microbiology .2024;[Epub] CrossRef
Ruegeria spongiae sp. nov., isolated from Callyspongia elongata
Seung-Min Han, Jin-Sook Park
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Ramlibacter paludis sp. nov., isolated from wetland
Ji-Eun Lim, Jung-Hun Jo, Wan-Taek Im
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Paludibacterium denitrificans sp. nov., a Novel Denitrifying Bacterium Isolated from Activated Sludge
Ji Eun Lee, Gyu-Min Choi, Yong-Jae Lee, Sang-Mi Lee, Soon Youl Lee, Wan-Taek Im
Current Microbiology.2022;[Epub] CrossRef
Histidinibacterium aquaticum sp. nov., Isolated from Salt-Field Sea Water
Kyu-Hang Lee, Jin-Sook Park
Current Microbiology.2022;[Epub] CrossRef
Parashewanella hymeniacidonis sp. nov., isolated from marine sponge (Hymeniacidon sinapium)
Soo-Bin Kim, Jin-Sook Park
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Renewed interests in the discovery of bioactive actinomycete metabolites driven by emerging technologies
Jenifer Ossai, Behnam Khatabi, S. Eric Nybo, Madan K. Kharel
Journal of Applied Microbiology.2022; 132(1): 59. CrossRef
Bioprospecting of Soil-Derived Actinobacteria Along the Alar-Hotan Desert Highway in the Taklamakan Desert
Shaowei Liu, Ting Wang, Qinpei Lu, Feina Li, Gang Wu, Zhongke Jiang, Xugela Habden, Lin Liu, Xiaolin Zhang, Dmitry A. Lukianov, Ilya A. Osterman, Petr V. Sergiev, Olga A. Dontsova, Chenghang Sun
Frontiers in Microbiology.2021;[Epub] CrossRef
Chryseobacterium panacisoli sp. nov., isolated from ginseng-cultivation soil with ginsenoside-converting activity
Dong Ho Keum, Jun Mo Yeon, Chan-Seok Yun, Soon Youl Lee, Wan-Taek Im
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
Flagellimonas hymeniacidonis sp. nov., Isolated from the Sponge Hymeniacidon sinapium
Tae-Gi Shin, Jin-Sook Park
Current Microbiology.2021; 78(3): 1061. CrossRef
Vibrio ulleungensis sp. nov., isolated from Mytilus coruscus
Yea-Lin Moon, Jin-Sook Park
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
Actinobacteria From Desert: Diversity and Biotechnological Applications
Feiyang Xie, Wasu Pathom-aree
Frontiers in Microbiology.2021;[Epub] CrossRef
Aeromicrobium chenweiae sp. nov. and Aeromicrobium yanjiei sp. nov., isolated from Tibetan antelope (Pantholops hodgsonii) and plateau pika (Ochotona curzoniae), respectively
Junqin Li, Wenjing Lei, Jing Yang, Shan Lu, Dong Jin, Xin-He Lai, Sihui Zhang, Yanpeng Cheng, Fei Mi, Yuyuan Huang, Ji Pu, Kui Dong, Zhi Tian, Xiaomin Wu, Ying Huang, Suping Wang, Jianguo Xu
International Journal of Systematic and Evolutionary Microbiology .2020; 70(8): 4683. CrossRef
Hydrogenophaga borbori sp. nov., isolated from activated sludge
Gyu-min Choi, Soon Youl Lee, Sang Yong Kim, Ji-Hyang Wee, Wan-Taek Im
International Journal of Systematic and Evolutionary Microbiology .2020; 70(1): 555. CrossRef
Ochrobactrum soli sp. nov., Isolated from a Korean Cattle Farm
Gyu-Min Choi, Kyung Min Kim, Chan-Seok Yun, Soon Youl Lee, Sang Yong Kim, Ji-Hyang Wee, Wan-Taek Im
Current Microbiology.2020; 77(6): 1104. CrossRef
Comparative Lipidomic Analysis of Extracellular Vesicles Derived from Lactobacillus plantarum APsulloc 331261 Living in Green Tea Leaves Using Liquid Chromatography-Mass Spectrometry
Hyoseon Kim, Minjung Kim, Kilsun Myoung, Wanil Kim, Jaeyoung Ko, Kwang Pyo Kim, Eun-Gyung Cho
International Journal of Molecular Sciences.2020; 21(21): 8076. CrossRef

Antibacterial compound produced by Pseudomonas aeruginosa strain UICC B-40, an endophytic bacterium isolated from Neesia altissima: Rina Hidayati Pratiwi , Iman Hidayat , Muhammad Hanafi , Wibowo Mangunwardoyo; J. Microbiol. 2017;55(4):289-295. Published online January 26, 2017; DOI: https://doi.org/10.1007/s12275-017-6311-0

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Abstract

This study’s aim was to determine the identity of antibacte-rial compounds produced by Pseudomonas aeruginosa strain UICC B-40 and describe the antibacterial compounds’ me-chanisms of action for damaging pathogenic bacteria cells. Isolation and identification of the compounds were carried out using thin layer chromatography (TLC), nuclear mag-netic resonance (NMR) spectroscopy and liquid chromato-graphy mass spectrometry (LC-MS) analyses. Antibacterial activity was assayed via minimum inhibitory concentration (MIC) and the antibacterial compound mechanism was ob-served morphologically through scanning electron micros-copy (SEM). This study successfully identified the (2E,5E)- phenyltetradeca-2,5-dienoate antibacterial compound (mole-cular weight 300 g/mol), composed of a phenolic ester, fatty acid and long chain of aliphatic group structures. MIC values for this compound were determined at 62.5 μg/ml against Staphylococcus aureus strain ATCC 25923. The mechanism of the compound involved breaking down the bacterial cell walls through the lysis process. The (2E,5E)-phenyltetradeca- 2,5-dienoate compound exhibited inhibitory activity on the growth of Gram-positive bacteria.

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Antimicrobial mechanisms and antifungal activity of compounds generated by banana rhizosphere Pseudomonas aeruginosa Gxun-2 against fusarium oxysporum f. sp. cubense
Junming Lu, Yanbing Huang, Rui Liu, Ying Liang, Hongyan Zhang, Naikun Shen, Dengfeng Yang, Mingguo Jiang
Frontiers in Microbiology.2024;[Epub] CrossRef
Progress in the Study of Natural Antimicrobial Active Substances in Pseudomonas aeruginosa
Tianbo Si, Anqi Wang, Haowen Yan, Lingcong Kong, Lili Guan, Chengguang He, Yiyi Ma, Haipeng Zhang, Hongxia Ma
Molecules.2024; 29(18): 4400. CrossRef
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Farkhod Eshboev, Nilufar Mamadalieva, Pavel Nazarov, Hidayat Hussain, Vladimir Katanaev, Dilfuza Egamberdieva, Shakhnoz Azimova
Antibiotics.2024; 13(3): 271. CrossRef
Chisocheton pentandrus (Blanco) Merr. leaf as a potential antioxidant and α-glucosidase inhibitory agent
I P A H Wibawa, M Hanafi, Minarti, A S Li’aini, A Rahayu, C I M Semarayani, I N Lugrayasa, V M Butardo, P J Mahon
IOP Conference Series: Earth and Environmental Science.2024; 1312(1): 012054. CrossRef
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I P A H Wibawa, M Hanafi, A S Li’aini, A Rahayu, I N Lugrayasa, V M Butardo, P J Mahon
IOP Conference Series: Earth and Environmental Science.2023; 1255(1): 012016. CrossRef
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L.R. Valeeva, D.S. Pudova, N.N. Khabipova, L.H. Shigapova, E.I. Shagimardanova, A.M. Rogov, T.R. Tagirova, Z.G. Gimadeev, M.R. Sharipova
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Madhuree Kumari, Kamal A. Qureshi, Mariusz Jaremko, James White, Sandeep Kumar Singh, Vijay Kumar Sharma, Kshitij Kumar Singh, Gustavo Santoyo, Gerardo Puopolo, Ajay Kumar
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Antibacterial assay guided isolation of a novel hydroxy-substituted pentacyclo ketonic compound from Pseudomonas aeruginosa MBTDCMFRI Ps04
Anusree V. Nair, Praveen N. K, Leo Antony. M, K. K. Vijayan
Brazilian Journal of Microbiology.2021; 52(1): 335. CrossRef
In vitro antimicrobial activities of several extracts endophytic Pseudomonas azotoformans UICC B-91
E Oktarina, R H Pratiwi, W Mangunwardoyo, I Hidayat, E Saepudin
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Biocompatible, antibacterial, polymeric hydrogels active against multidrug-resistant Staphylococcus aureus strains for food packaging applications
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Culture-dependent analysis of seed bacterial endophyte, Pseudomonas spp. EGN 1 against the stem rot disease (Sclerotium rolfsii Sacc.) in groundnut
T. Archana, L. Rajendran, S. K. Manoranjitham, V. P. Santhana Krishnan, M. Paramasivan, G. Karthikeyan
Egyptian Journal of Biological Pest Control.2020;[Epub] CrossRef
Antifungal activity of 3-acetylbenzamide produced by actinomycete WA23-4-4 from the intestinal tract of Periplaneta americana
Xia Fang, Juan Shen, Jie Wang, Zhi-li Chen, Pei-bin lin, Zhi-yu Chen, Lin-yan Liu, Huan-xiong Zeng, Xiao-bao Jin
Journal of Microbiology.2018; 56(7): 516. CrossRef
Fatty acids and their amide derivatives from endophytes: new therapeutic possibilities from a hidden source
Rabia Tanvir, Aqeel Javeed, Yasir Rehman
FEMS Microbiology Letters.2018;[Epub] CrossRef

An in vitro study of the antifungal activity of Trichoderma virens 7b and a profile of its non-polar antifungal components released against Ganoderma boninense: Lee Pei Lee Angel , Mohd Termizi Yusof , Intan Safinar Ismail , Bonnie Tay Yen Ping , Intan Nur Ainni Mohamed Azni , Norman Hj Kamarudin , Shamala Sundram; J. Microbiol. 2016;54(11):732-744. Published online October 29, 2016; DOI: https://doi.org/10.1007/s12275-016-6304-4

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Abstract

Ganoderma boninense is the causal agent of a devastating disease affecting oil palm in Southeast Asian countries. Basal stem rot (BSR) disease slowly rots the base of palms, which radically reduces productive lifespan of this lucrative crop. Previous reports have indicated the successful use of Trichoderma as biological control agent (BCA) against G. boninense and isolate T. virens 7b was selected based on its initial screening. This study attempts to decipher the mechanisms responsible for the inhibition of G. boninense by identifying and characterizing the chemical compounds as well as the physical mechanisms by T. virens 7b. Hexane extract of the isolate gave 62.60% ± 6.41 inhibition against G. boninense and observation under scanning electron microscope (SEM) detected severe mycelial deformation of the pathogen at the region of inhibition. Similar mycelia deformation of G. boninense was observed with a fungicide treatment, Benlate® indicating comparable fungicidal effect by T. virens 7b. Fraction 4 and 5 of hexane active fractions through preparative thin layer chromatography (P-TLC) was identified giving the best inhibition of the pathogen. These fractions comprised of ketones, alcohols, aldehydes, lactones, sesquiterpenes, monoterpenes, sulphides, and free fatty acids profiled through gas chromatography mass spectrometry detector (GC/MSD). A novel antifungal compound discovery of phenylethyl alcohol (PEA) by T. virens 7b is reported through this study. T. virens 7b also proved to be an active siderophore producer through chrome azurol S (CAS) agar assay. The study demonstrated the possible mechanisms involved and responsible in the successful inhibition of G. boninense.

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GC-MS analysis and antifungal potential of flower extract of Acacia nilotica subsp. Indica against Macrophomina phaseolina
Muhammad Rafiq, Arshad Javaid, Ammara Kanwal, Aneela Anwar, Iqra Haider Khan, Qudsia Kanwal, Chunsong Cheng
Microbial Pathogenesis.2024; 194: 106819. CrossRef
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Diversity of indigenous endophytic bacteria associated with the roots of Chinese cabbage (Brassica campestris L.) cultivars and their antagonism towards pathogens: Md. Azizul Haque , Han Dae Yun , Kye Man Cho; J. Microbiol. 2016;54(5):353-363. Published online April 20, 2016; DOI: https://doi.org/10.1007/s12275-016-5641-7

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Abstract

The study aimed to reveal the diversity of endophytic bacteria in the roots of Chinese cabbage (CC) cultivated in two areas in Korea, namely, Seosang-gun (SS) and Haenam-gun (HN), and also in a transgenic plant (TP) from the laboratory. A total of 653 colonies were isolated from the interior of CC roots, comprising 118, 302, and 233 isolates from SS, HN, and TP samples, respectively. Based on 16S rRNA gene sequence analysis, the isolates belonged to four major phylogenetic groups: high-G+C Gram-positive bacteria (HGC-GPB), low-G+C Gram-positive bacteria (LGC-GPB), Proteobacteria, and Bacteriodetes. The most dominant groups in the roots of the SS, HN, and TP cultivars were LGC-GPB (48.3%), Proteobacteria (50.2%), and HGC-GPB (38.2%), respectively. Importantly, most of the isolates that produced cell-walldegrading enzymes belonged to the genus Bacillus. Bacillus sp. (HNR03, TPR06), Bacillus pumilus (SSR07, HNR11, TPR07), and Bacillus subtilis (TPR03) showed high antagonism against the tested food-borne pathogenic bacteria. In addition, Bacillus sp. (HNR03, TPR06), Bacillus pumilus (SSR07, HNR11, HNR17, TPR11), Microbacterium oxidans (SSR09, TPR04), Bacillus cereus HNR10, Pseudomonas sp. HNR13, and Bacillus subtilis (TPR02, TPR03) showed strong antagonistic activity against the fungi Phythium ultimum, Phytophthora capsici, Fusarium oxysporum, and Rhizoctonia solani. The endophytes isolated from the TP cultivar showed the strongest antagonistic reactions against pathogens. This study is the first report on endophytic bacteria from Chinese cabbage roots.

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Enhanced rice plant (BRRI-28) growth at lower doses of urea caused by diazinon mineralizing endophytic bacterial consortia and explorations of relevant regulatory genes in a Klebsiella sp. strain HSTU-F2D4R
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In vivo antimalarial activity of the endophytic actinobacteria, Streptomyces SUK 10: Mohd Shukri Baba , Noraziah Mohamad Zin , Zainal Abidin Abu Hassan , Jalifah Latip , Florence Pethick , Iain S. Hunter , RuAngelie Edrada-Ebel , Paul R. Herron; J. Microbiol. 2015;53(12):847-855. Published online December 2, 2015; DOI: https://doi.org/10.1007/s12275-015-5076-6

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Abstract

Endophytic bacteria, such as Streptomyces, have the potential to act as a source for novel bioactive molecules with medicinal properties. The present study was aimed at assessing the antimalarial activity of crude extract isolated from various strains of actinobacteria living endophytically in some Malaysian medicinal plants. Using the four day suppression test method on male ICR strain mice, compounds produced from three strains of Streptomyces (SUK8, SUK10, and SUK27) were tested in vivo against Plasmodium berghei PZZ1/100 in an antimalarial screen using crude extracts at four different concentrations. One of these extracts, isolated from Streptomyces SUK10 obtained from the bark of Shorea ovalis tree, showed inhibition of the test organism and was further tested against P. berghei-infected mice for antimalarial activity at different concentrations. There was a positive relationship between the survival of the infected mouse group treated with 50 μg/kg body weight (bw) of ethyl acetate-SUK10 crude extract and the ability to inhibit the parasites growth. The parasite inhibition percentage for this group showed that 50% of the mice survived for more than 90 days after infection with the parasite. The nucleotide sequence and phylogenetic tree suggested that Streptomyces SUK10 may constitute a new species within the Streptomyces genus. As part of the drug discovery process, these promising finding may contribute to the medicinal and pharmaceutical field for malarial treatment.

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Illumina-based analysis of bacterial diversity related to halophytes Salicornia europaea and Sueada aralocaspica: Ying-wu Shi , Kai Lou , Chun Li , Lei Wang , Zhen-yong Zhao , Shuai Zhao , Chang-yan Tian; J. Microbiol. 2015;53(10):678-685. Published online October 2, 2015; DOI: https://doi.org/10.1007/s12275-015-5080-x

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Abstract

We used Illumina-based 16S rRNA V3 amplicon pyrosequencing to investigate the community structure of soil bacteria from the rhizosphere surrounding Salicornia europaea, and endophytic bacteria living in Salicornia europaea plants and Sueada aralocaspica seeds growing at the Fukang Desert Ecosystem Observation and Experimental Station (FDEOES) in Xinjiang Province, China, using an Illumina genome analyzer. A total of 89.23 M effective sequences of the 16S rRNA gene V3 region were obtained from the two halophyte species. These sequences revealed a number of operational taxonomic units (OTUs) in the halophytes. There were between 22–2,206 OTUs in the halophyte plant sample, at the 3% cutoff level, and a sequencing depth of 30,000 sequences. We identified 25 different phyla, 39 classes and 141 genera from the resulting 134,435 sequences. The most dominant phylum in all the samples was Proteobacteria (41.61%–99.26%; average, 43.30%). The other large phyla were Firmicutes (0%– 7.19%; average, 1.15%), Bacteroidetes (0%–1.64%; average, 0.44%) and Actinobacteria (0%–0.46%; average, 0.24%). This
result
suggested that the diversity of bacteria is abundant in the rhizosphere soil, while the diversity of bacteria was poor within Salicornia europaea plant samples. To the extent of our knowledge, this study is the first to characterize and compare the endophytic bacteria found within different halophytic plant species roots using PCR-based Illumina pyrosequencing
method
.

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Azole-synergistic Anti-Candidal Activity of Altenusin, a Biphenyl Metabolite of the Endophytic Fungus Alternaria alternata Isolated from Terminalia chebula Retz.: Jatuporn Phaopongthai , Suthep Wiyakrutta , Duangdeun Meksuriyen , Nongluksna Sriubolmas , Khanit Suwanborirux; J. Microbiol. 2013;51(6):821-828. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3189-3

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Abstract

In this study, a tropical endophytic fungus, Alternaria alternata Tche-153 was isolated from a Thai medicinal plant Terminalia chebula Rezt. The ethyl acetate extract prepared from the fermentation broth exhibited significant ketoconazole- synergistic activity against Candida albicans. Bioassaydirected fractionation of the ethyl acetate extract led to the isolation of altenusin (1), isoochracinic acid (2), and altenuic acid (3) together with 2,5-dimethyl-7-hydroxychromone (4). Using the disc diffusion method and the microdilution chequerboard technique, only altenusin (1) in combination with each of three azole drugs, ketoconazole, fluconazole or itraconazole at their low sub-inhibitory concentrations exhibited potent synergistic activity against C. albicans with the fractional inhibitory concentration index range of 0.078 to 0.188. This first discovery of altenusin (1) as a new azole-synergistic prototype possessing a biphenyl structure is of significance for further development of new azole-synergists to treat invasive candidiasis.

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Endophytic Fungal Pre-treatments of Seeds Alleviates Salinity Stress ffects in Soybean Plants: Ramalingam Radhakrishnan , Abdul Latif Khan , In-Jung Lee; J. Microbiol. 2013;51(6):850-857. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3168-8

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Abstract

In the present study, four endophytic fungi (GM-1, GM-2, GM-3, and GM-4) were tested for their ability to improve soybean plant growth under salinity stress conditions. The seed germination and plant growth were higher in seeds pretreated with endophytic fungal cultures than their controls. The positive influence of fungi on plant growth was supported by gibberellins analysis of culture filtrate (CF), which showed wide diversity and various concentrations of GAs. Specifically, GA4, GA7, GA8, GA9, GA12, and GA20 were found in fungal CFs. Under salinity stress conditions, GM-1 significantly enhanced the length and fresh weight of soybean plants relative to other fungal treatments. GM-1 effectively mitigated the adverse effects of salinity by limiting lipid peroxidation and accumulating protein content. GM-2, GM-3, and GM-4 also counteracted the salinity induced oxidative stress in soybean plants through reduction of lipid peroxidation and enhancement of protein content, maintaining the length and fresh weight of shoots. The activities of the antioxidant enzymes catalase, superoxide dismutase and peroxidase were inhibited in salinity exposed plants, while GM-1 significantly enhanced these antioxidant enzyme activities in plants under salt stress. GM-1 treatment also showed lower levels of abscisic acid and elevated levels of salicylic acid in plants under salinity stress. Hence, GM-1 was identified as Fusarium verticillioides (teleomorph Gibberella moniliformis) isolate RK01 based on its DNA sequence homology. These results suggest that endophytic fungal (F. verticillioides) pre-treatment of soybean seeds would be an effective method to promote soybean plant growth under salinity stress conditions.

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The Role of a Dark Septate Endophytic Fungus, Veronaeopsis simplex Y34, in Fusarium Disease Suppression in Chinese Cabbage: Rida O. Khastini , Hiroyuki Ohta , Kazuhiko Narisawa; J. Microbiol. 2012;50(4):618-624. Published online August 25, 2012; DOI: https://doi.org/10.1007/s12275-012-2105-6

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Abstract: The soil-inhabiting fungal pathogen Fusarium oxysporum has been an increasing threat to Chinese cabbage (Brassica campestris L.). A dark septate endophytic fungus, Veronaeopsis simplex Y34, isolated from Yaku Island, Japan, was evaluated in vitro for the ability to suppress Fusarium disease. Seedlings grown in the presence of the endophyte showed a 71% reduction in Fusarium wilt disease and still had good growth. The disease control was achieved through a synergetic effect involving a mechanical resistance created by a dense network of V. simplex Y34 hyphae, which colonized the host root, and siderophore production acting indirectly to induce a resistance mechanism in the plant. Changes in the relative abundance of the fungal communities in the soil as determined by fluorescently labelled T-RFs (terminal restriction fragments), appeared 3 weeks after application of the fungus. Results showed the dominance of V. simplex Y34, which became established in the rhizosphere and out-competed F. oxysporum.

Diversity and Physiological Properties of Root Endophytic Actinobacteria in Native Herbaceous Plants of Korea: Tae-Ui Kim , Sung-Heun Cho , Ji-Hye Han , Young Min Shin , Hyang Burm Lee , Seung Bum Kim; J. Microbiol. 2012;50(1):50-57. Published online February 27, 2012; DOI: https://doi.org/10.1007/s12275-012-1417-x

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Abstract: Endophytic actinobacterial diversity in the native herbaceous plant species of Korea was analyzed using a culturebased approach. Sixty one actinobacterial strains were isolated, and assigned to 15 genera based on 16S rRNA gene analysis. The members of the genus Streptomyces comprised 45.9% of the total isolates, followed by Micromonospora (18.8%), Rhodococcus (6.6%), Microbispora (4.9%), and Micrococcus (4.9%). Other minor constituents included members of Microbacterium, Streptacidiphilus, Arthrobacter, Dietzia, Kitasatospora, Herbiconiux, Mycobacterium, Nocardia, Rathayibacter, and Tsukamurella. Among the isolates, 65.6% exhibited at least one hydrolytic enzyme activity out of four, and 45.9% exhibited antagonistic activity against at least one fungal pathogen out of five, thus demonstrating that endophytic actinobacteria can be an important source of bioactive compounds. Notably, most strains of Streptomyces proved active for both enzymatic and antagonistic activities.

Symbiotic Interaction of Endophytic Bacteria with Arbuscular Mycorrhizal Fungi and Its Antagonistic Effect on Ganoderma boninense: Shamala Sundram , Sariah Meon , Idris Abu Seman , Radziah Othman; J. Microbiol. 2011;49(4):551-557. Published online September 2, 2011; DOI: https://doi.org/10.1007/s12275-011-0489-3

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Abstract: Endophytic bacteria (Pseudomonas aeruginosa UPMP3 and Burkholderia cepacia UPMB3), isolated from within roots of oil palm (Elaeis guineensis Jacq.), were tested for their presymbiotic effects on two arbuscular mycorrhizal fungi, (Glomus intraradices UT126 and Glomus clarum BR152B). These endophytic bacteria were also tested for antagonistic effects on Ganoderma boninense PER 71, a white wood rot fungal pathogen that causes a serious disease in oil palm. Spore germination and hyphal length of each arbuscular mycorrhizal fungal (AMF) pairing with endophytic bacteria was found to be significantly higher than spores plated in the absence of bacteria. Scanning electron microscopy (SEM) showed that the endophytic bacteria were scattered, resting or embedded on the surface hyaline layer or on the degraded walls of AMF spores, possibly feeding on the outer hyaline spore wall. The antagonistic effect of the endophytic bacteria was expressed as severe morphological abnormalities in the hyphal structures of G. boninense PER 71. The effects of the endophytic bacteria on G. boninense PER 71 hyphal structures were observed clearly under SEM. Severe inter-twisting, distortion, lysis and shrivelling of the hyphal structures were observed. This study found that the effect of endophytic bacteria on G. intraradices UT126 and G. clarum BR152B resembled that of a mycorrhiza helper bacteria (MHB) association because the association significantly promoted AMF spore germination and hyphal length. However, the endophytic bacteria were extremely damaging to G. boninense PER 71.

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