Journal of Microbiology

Journal Articles

Photosynthetic and biochemical responses of the freshwater green algae Closterium ehrenbergii Meneghini (Conjugatophyceae) exposed to the metal coppers and its implication for toxicity testing: Hui Wang , Vinitha Ebenezer , Jang-Seu Ki; J. Microbiol. 2018;56(6):426-434. Published online June 1, 2018; DOI: https://doi.org/10.1007/s12275-018-8081-8

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The freshwater green algae Closterium is sensitive to water quality, and hence has been suggested as ideal organisms for toxicity testing. In the present study, we evaluated the photosynthetic and biochemical responses of C. ehrenbergii to the common contaminants, coppers. The 72 h median effective concentrations (EC50) of CuSO4 and CuCl2 on the test organism were calculated to be 0.202 mg/L and 0.245 mg/L, respectively. Exposure to both coppers considerably decreased pigment levels and photosynthetic efficiency, while inducing the generation of reactive oxygen species (ROS) in cells with increased exposure time. Moreover, the coppers significantly increased the levels of lipid peroxidation and superoxide dismutase (SOD) activity, even at relatively lower concentrations. These suggest that copper contaminants may exert deleterious effects on the photosynthesis and cellular oxidative stress of C. ehrenbergii, representing its powerful potential in aquatic toxicity assessments.

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Photosynthetic and antioxidant responses of Ankistrodesmus flexuosus and Curvastrum pantanale to environmentally relevant copper concentrations
Suleiman Dauda, Ana Teresa Lombardi
Physiologia Plantarum.2024;[Epub] CrossRef
Molecular characterization of a catalase gene in the freshwater green alga Closterium ehrenbergii and its putative function against abiotic stresses
Hui Wang, Peiling Wu, Fengru Li, Jeongmin Shin, Jang-Seu Ki
European Journal of Protistology.2024; 95: 126111. CrossRef
Two novel glutathione S-transferase (GST) genes in the toxic marine dinoflagellate Alexandrium pacificum and their transcriptional responses to environmental contaminants
Hyunjun Park, Han-Sol Kim, Sofia Abassi, Quynh Thi Nhu Bui, Jang-Seu Ki
Science of The Total Environment.2024; 915: 169983. CrossRef
Sub‐lethal effects of metals and pesticides on the freshwater dinoflagellate Palatinus apiculatus and environmental implications
Quynh Thi Nhu Bui, Taehee Kim, Han‐Sol Kim, Seokmin Lee, Seungjun Lee, Jang‐Seu Ki
Water Environment Research.2024;[Epub] CrossRef
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Mine Water and the Environment.2023; 42(3): 361. CrossRef
Toxic effect of copper on soil microalgae: experimental data and critical review
Y. Maltsev, S. Maltseva, M. Kulikovskiy
International Journal of Environmental Science and Technology.2023; 20(10): 10903. CrossRef
Molecular cloning and oxidative‐stress responses of a novel Phi class glutathione S‐transferase (GSTF) gene in the freshwater algae Closterium ehrenbergii
Sofia Abassi, Hui Wang, Hansol Kim, Jang‐Seu Ki
Environmental Toxicology.2022; 37(4): 789. CrossRef
The effects of copper ions and copper nanomaterials on the output of amino acids from marine microalgae
Wenqiu Huang, Yuping Zhou, Ting Zhao, Liju Tan, Jiangtao Wang
Environmental Science and Pollution Research.2022; 29(7): 9780. CrossRef
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Beatrycze Nowicka
Environmental Science and Pollution Research.2022; 29(12): 16860. CrossRef
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Nurul Akmal Che Lah, Robert Gray, Sonia Trigueros
Microbial Cell Factories.2021;[Epub] CrossRef
Transcriptomic sequencing reveals the response of Dunaliella salina to copper stress via the increased photosynthesis and carbon mechanism
Na Ling, Weilu Li, Guiguo Xu, Zheng Qi, Chenfeng Ji, Xiaorui Liu, Di Cui, Yuan Sun
Molecular Omics.2021; 17(5): 769. CrossRef
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L. Rendón-Castrillón, M. Ramírez-Carmona, C. Ocampo-López, R. Giraldo-Aristizabal
Brazilian Journal of Biology.2021; 81(1): 202. CrossRef
Self-polishing emulsion platforms: Eco-friendly surface engineering of coatings toward water borne marine antifouling
Jianbin Zhang, Yizhe Liu, Xingwei Wang, Chaoyang Zhang, Hui Liu, Wufang Yang, Meirong Cai, Xiaowei Pei, Feng Zhou
Progress in Organic Coatings.2020; 149: 105945. CrossRef
Molecular identification, differential expression and protective roles of iron/manganese superoxide dismutases in the green algae Closterium ehrenbergii against metal stress
Hui Wang, Jang-Seu Ki
European Journal of Protistology.2020; 74: 125689. CrossRef
Molecular characterization and expression analysis of copper‐zinc superoxide dismutases from the freshwater alga Closterium ehrenbergii under metal stress
Hui Wang, Jang‐Seu Ki
Environmental Toxicology.2020; 35(1): 5. CrossRef
Effect of polymeric biocide polyhexamethylene guanidine hydrochloride on morpho-physiological and biochemical parameters of wheat seedlings under copper stress
L. Lyoshyna, O. Tarasyuk, O. Bulko, S. Rogalsky, T. Kamenieva, M. Kuchuk
Agricultural Science and Practice.2020; 7(1): 49. CrossRef
The Growth, Population Size Structure, Physiological Changes, and Ultrastructure of the Microalga Picochlorum maculatum (Chlorophyta) under Sublethal Copper Concentrations
Zh. V. Markina
Russian Journal of Marine Biology.2020; 46(5): 346. CrossRef
Genome analyses provide insights into the evolution and adaptation of the eukaryotic Picophytoplankton Mychonastes homosphaera
Changqing Liu, Xiaoli Shi, Fan Wu, Mingdong Ren, Guang Gao, Qinglong Wu
BMC Genomics.2020;[Epub] CrossRef
Small heat shock protein genes of the green algae Closterium ehrenbergii: Cloning and differential expression under heat and heavy metal stresses
Sofia Abassi, Hui Wang, Thangaraj Ponmani, Jang‐Seu Ki
Environmental Toxicology.2019; 34(9): 1013. CrossRef
Yellow clay modulates carbohydrate and glutathione responses in the harmful dinoflagellate Cochlodinium polykrikoides and leads to sedimentation
Jang-Seu Ki, Vinitha Ebenezer, Weol-Ae Lim
European Journal of Protistology.2019; 71: 125642. CrossRef
Differential transcriptional responses of carotenoid biosynthesis genes in the marine green alga Tetraselmis suecica exposed to redox and non-redox active metals
Ramaraj Sathasivam, Jang-Seu Ki
Molecular Biology Reports.2019; 46(1): 1167. CrossRef
Origin and roles of a novel copper-zinc superoxide dismutase (CuZnSOD) gene from the harmful dinoflagellate Prorocentrum minimum
Hui Wang, Sofia Abassi, Jang-Seu Ki
Gene.2019; 683: 113. CrossRef
Enhancement of growth and paramylon production of Euglena gracilis by co-cultivation with Pseudoalteromonas sp. MEBiC 03485
Min Seo Jeon, Jeong-Joo Oh, Jee Young Kim, Sang-Il Han, Sang Jun Sim, Yoon-E Choi
Bioresource Technology.2019; 288: 121513. CrossRef
Molecular cloning and oxidative-stress responses of a novel manganese superoxide dismutase (MnSOD) gene in the dinoflagellate Prorocentrum minimum
Hui Wang, Hansol Kim, Weol-Ae Lim, Jang-Seu Ki
Molecular Biology Reports.2019; 46(6): 5955. CrossRef

Effect of dietary copper level on the gut microbiota and its correlation with serum inflammatory cytokines in Sprague-Dawley rats: Feng Zhang , Weijiang Zheng , Rong Guo , Wen Yao; J. Microbiol. 2017;55(9):694-702. Published online September 2, 2017; DOI: https://doi.org/10.1007/s12275-017-6627-9

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Abstract

In China’s swine industry, copper is generally supplemented above the National Research Council (NRC) requirement (2012) because of its antimicrobial properties and the potential for growth promotion. Yet few are concerned about whether this excess supplementation is necessary. In this study, the 16S rRNA pyrosequencing was designed and used to investigate the effect of dietary copper level on the diversity of the fecal microbial community and the correlation of copper level with the serum level of inflammatory cytokines in Sprague-Dawley rat models. The results showed that the diet containing a high level of Cu (120 and 240 mg/kg) changed the microbial richness and diversity of rat feces associated with the increased copper content in the rat ileac and colonic digesta. Furthermore, a Pearson’s correlation analysis indicated that an accumulation of unabsorbed copper in the chyme was correlated with the microbial composition of the rat feces, which was linked with TNF-α in serum. The results suggest that dietary copper level may have a direct impact on circulating inflammatory cytokines in the serum, perhaps inducing an inflammatory response by altering the microbial composition of rat feces. Serum TNF-α could be the chief responder to excessive copper exposure.

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Comparison of antibiotic resistance and copper tolerance of Enterococcus spp. and Lactobacillus spp. isolated from piglets before and after weaning: Xueting Zou , Mengwei Weng , Xu Ji , Rong Guo , Weijiang Zheng , Wen Yao; J. Microbiol. 2017;55(9):703-710. Published online September 2, 2017; DOI: https://doi.org/10.1007/s12275-017-6241-x

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Abstract

In China, antimicrobials and copper are used extensively as growth-promoting agents for piglets. This study aimed to characterize the role of in-feed copper in the emergence of copper-tolerant and antibiotic-resistant Enterococcus and Lactobacillus isolates in Chinese pig farms. Feces of the same eight piglets from four litters at 7 and 55 days old and their mothers were traced in order to isolate Enterococcus spp. and Lactobacillus spp.. The minimum inhibitory concentrations of 10 antimicrobials and copper sulfate were determined using an agar dilution method. The feed levels of Cu2+ for lactating sows, suckling piglets, and weaned piglets were 6, 177, and 18 mg/kg, respectively. All the 136 Enterococcus isolates were sensitive to vancomycin; and the resistance rates to penicillin, enrofloxacin, and high level streptomycin resistance increased significantly after weaning. For the 155 Lactobacillus isolates, the resistance rates to ampicillin, chloramphenicol, tetracycline, and enrofloxacin were significantly higher in weaned piglets. The ratios of copper tolerant Enterococcus and Lactobacillus isolates both increased significantly after weaning (P < 0.05). A phenotypic correlation was observed after classifying the isolates into two groups (CuSO4 MIC50 < 16 or 􎃶􀁇16 for enterococci; CuSO4 MIC50 < 12 or 􎃶􀁇12 for lactobacilli) and comparing the antimicrobial-resistant percentage of two groups. On species level, a significant increase of E. faecalis to enrofloxacin was observed in line with the increase of copper MIC (P < 0.05). The findings revealed the changes of the antibiotic resistance and copper tolerance level of enterococci and lactobacilli between suckling and weaned piglets and demonstrated that there might be a strong association between in-feed copper and increased antibiotic resistance in enterococci and lactobacilli in Chinese intensive swine farms.

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Comparative Genome Analysis and Characterization of the Probiotic Properties of Lactic Acid Bacteria Isolated from the Gastrointestinal Tract of Wild Boars in the Czech Republic
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Uncovering the effects of copper feed supplementation on the selection of copper-tolerant and antibiotic-resistant Enterococcus in poultry production for sustainable environmental practices
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Research Support, Non-U.S. Gov'ts

Copper as an Antimicrobial Agent against Opportunistic Pathogenic and Multidrug Resistant Enterobacter Bacteria: Wen-Xiao Tian , Shi Yu , Muhammad Ibrahim , Abdul Wareth Almonaofy , Liu He , Qiu Hui , Zhu Bo , Bin Li , Guan-lin Xie; J. Microbiol. 2012;50(4):586-593. Published online July 21, 2012; DOI: https://doi.org/10.1007/s12275-012-2067-8

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Abstract: Infections by Enterobacter species are common and are multidrug resistant. The use of bactericidal surface materials such as copper has lately gained attention as an effective antimicrobial agent due to its deadly effects on bacteria, yeast, and viruses. The aim of the current study was to assess the antibacterial activity of copper surfaces against Enterobacter species. The antibacterial activity of copper surfaces was tested by overlying 5×106 CFU/ml suspensions of representative Enterobacter strains and comparing bacterial survival counts on copper surfaces at room temperature. Iron, stainless steel, and polyvinylchloride (PVC) were used as controls. The mechanisms responsible for bacterial killing on copper surfaces were investigated by a mutagenicity assay of the D-cycloserin (cyclA gene), single cell gel electrophoresis, a staining technique, and inductively coupled plasma mass spectroscopy. Copper yielded a significant decrease in the viable bacterial counts at 2 h exposure and a highly significant decrease at 4 h. Loss of cell integrity and a significantly higher influx of copper into bacterial cells exposed to copper surfaces, as compared to those exposed to the controls, were documented. There was no increase in mutation rate and DNA damage indicating that copper contributes to bacterial killing by adversely affecting cellular structure without directly targeting the genomic DNA. These findings suggest that copper’s antibacterial activity against Enterobacter species could be utilized in health care facilities and in food processing plants to reduce the bioburden, which would increase protection for susceptible members of the community.

NOTE] Copper Resistance and Its Relationship to Erythromycin Resistance in Enterococcus Isolates from Bovine Milk Samples in Korea: JiHoon Kim , SangJin Lee , SungSook Choi; J. Microbiol. 2012;50(3):540-543. Published online June 30, 2012; DOI: https://doi.org/10.1007/s12275-012-1579-6

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Abstract: Antibiotic resistance in animal isolates of enterococci is a public health concern, because of the risk of transmission of antibiotic-resistant strains or resistance genes to humans through the food chain. This study investigated copper resistance and its relationship with erythromycin resistance in 245 enterococcal isolates from bovine milk. Phenotypic and genotypic resistance to erythromycin and copper sulfate were investigated. Of the 245 enterococcal isolates, 79.2% (n=194) displayed erythromycin resistance (≥8 μg/ml). Of the erythromycin-resistant isolates, 97.4% (n=189) possessed erm(B), 73.7% (n=143) possessed mef(A), and 71.6% (n=139) possessed both genes. Of the 245 enterococcal isolates, only 4.5% (n=11) displayed copper resistance (≥28 mM) and the copper resistance gene, tcr(B), was detected in seven isolates that all possessed erm(B). This study is the first to report the tcr(B) gene in enterococci isolated from Korean bovine milk and its relationship to erythromycin resistance.

Molecular Analysis of the Copper-Responsive CopRSCD of a Pathogenic Pseudomonas fluorescens Strain: Yong-hua Hu , Hua-lei Wang , Min Zhang , Li Sun; J. Microbiol. 2009;47(3):277-286. Published online June 26, 2009; DOI: https://doi.org/10.1007/s12275-008-0278-9

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Abstract: CopRS/CopABCD is one of the known systems that control copper homeostasis in bacteria. Although CopRS/CopABCD homologues are found to exist in Pseudomonas fluorescens, the potential role of this system in P. fluorescens has not been investigated. In this study a genetic cluster, consisting of copR, S, C, and D but lacking copAB, was identified in a pathogenic P. fluorescens strain (TSS) isolated from diseased fish. The copRSCD cluster was demonstrated to be required for full copper resistance and regulated at the transcription level by Cu. Expression of copCD is regulated directly by the two-component response regulator CopR, which also regulates its own expression. Interruption of the regulated expression of copR affected bacterial growth, biofilm formation, and tissue dissemination and survival. A mutant CopR, which lacks the N-terminal signal receiver domain and is constitutively active, was found to have an attenuating effect on bacterial virulence when expressed in TSS. To our knowledge, this is the first report that suggests a link between CopR and bacterial pathogenicity in P. fluorescens.

Presence of an Inducible Semicarbazide-Sensitive Amine Oxidase in Mycobacterium sp. Strain JC1 DSM 3803 Grown on Benzylamine: Young-Tae Ro , Hyun-Il Lee , Young-Min Kim; J. Microbiol. 2006;44(2):243-247.; DOI: https://doi.org/2359 [pii]

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Abstract: Mycobacterium sp. strain JC1 was capable of growth on benzylamine as a sole source of carbon and energy. The primary deamination of benzylamine was mediated by an inducible amine oxidase, which can also oxidize tyramine, histamine, and dopamine. Inhibitor study identified this enzyme as a copper-containing amine oxidase sensitive to semicarbazide.

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