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Huo X, Zhou Z, Liu H, Wang G, Shi K. A PadR family transcriptional repressor regulates the transcription of chromate efflux transporter in Enterobacter sp. Z1. J Microbiol 2024; 62:355-365. [PMID: 38587592 DOI: 10.1007/s12275-024-00117-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 01/10/2024] [Accepted: 01/23/2024] [Indexed: 04/09/2024]
Abstract
Chromium is a prevalent toxic heavy metal, and chromate [Cr(VI)] exhibits high mutagenicity and carcinogenicity. The presence of the Cr(VI) efflux protein ChrA has been identified in strains exhibiting resistance to Cr(VI). Nevertheless, certain strains of bacteria that are resistant to Cr(VI) lack the presence of ChrB, a known regulatory factor. Here, a PadR family transcriptional repressor, ChrN, has been identified as a regulator in the response of Enterobacter sp. Z1(CCTCC NO: M 2019147) to Cr(VI). The chrN gene is cotranscribed with the chrA gene, and the transcriptional expression of this operon is induced by Cr(VI). The binding capacity of the ChrN protein to Cr(VI) was demonstrated by both the tryptophan fluorescence assay and Ni-NTA purification assay. The interaction between ChrN and the chrAN operon promoter was validated by reporter gene assay and electrophoretic mobility shift assay. Mutation of the conserved histidine residues His14 and His50 resulted in loss of ChrN binding with the promoter of the chrAN operon. This observation implies that these residues are crucial for establishing a DNA-binding site. These findings demonstrate that ChrN functions as a transcriptional repressor, modulating the cellular response of strain Z1 to Cr(VI) exposure.
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Affiliation(s)
- Xueqi Huo
- National Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Zijie Zhou
- National Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Hongliang Liu
- School of Life Sciences and Medicine, Shandong University of Technology, Zibo, 255000, Shandong Province, People's Republic of China
| | - Gejiao Wang
- National Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Kaixiang Shi
- National Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
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2
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Shu Q, Wang Y, Gu H, Zhu Q, Liu W, Dai Y, Li F, Li B. Effects of artificial diet breeding on intestinal microbial populations at the young stage of silkworm (Bombyx mori). ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2023:e22019. [PMID: 37096338 DOI: 10.1002/arch.22019] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/27/2023] [Accepted: 04/14/2023] [Indexed: 05/03/2023]
Abstract
The silkworm (Bombyx mori) is an economically important insect and serves as a model organism for Lepidoptera. To investigate the effects of the intestinal microbial population on the growth and development of larvae fed an artificial diet (AD) during the young stages, we analyzed the characteristics of the intestinal microbial population using 16S rRNA gene sequencing technology. Our results revealed that the intestinal flora of the AD group tended to be simple by the 3rd-instar, which Lactobacillus accounting for 14.85% and leading to a decreased pH in the intestinal fluid. In contrast, the intestinal flora of silkworms in the mulberry leaf (ML) group showed continuous growth of diversity, with Proteobacteria accounting for 37.10%, Firmicutes accounting for 21.44%, and Actinobacteria accounting for 17.36%. Additionally, we detected the activity of intestinal digestive enzymes at different instars and found that the activity of digestive enzymes in the AD group increased by larval instar. Protease activity in the AD group was lower during the 1st- to 3rd-instars compared to the ML group, while α-amylase and lipase activities were significantly higher in the AD group during the 2nd- and 3rd-instar compared to the ML group. Furthermore, our experimental results indicated that changes in the intestinal population decreased the pH and affected the activity of proteases, which might contribute to the slower growth and development of larvae in the AD group. In summary, this study provides a reference for investigating the relationship between artificial diet and intestinal flora balance.
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Affiliation(s)
- Qilong Shu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, China
| | - Yuanfei Wang
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, China
| | - Haoyi Gu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, China
| | - Qingyu Zhu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, China
| | - Wei Liu
- Suzhou Taihu Snow Silk Co., Ltd., Suzhou, China
| | - Yan Dai
- Suzhou Taihu Snow Silk Co., Ltd., Suzhou, China
| | - Fanchi Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, China
- Sericulture Institute of Soochow University, Suzhou, Jiangsu, P.R. China
| | - Bing Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, China
- Sericulture Institute of Soochow University, Suzhou, Jiangsu, P.R. China
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3
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Ping Q, Zhang Z, Ma L, Yan T, Wang L, Li Y. The prevalence and removal of antibiotic resistance genes in full-scale wastewater treatment plants: Bacterial host, influencing factors and correlation with nitrogen metabolic pathway. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 827:154154. [PMID: 35245555 DOI: 10.1016/j.scitotenv.2022.154154] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 02/21/2022] [Accepted: 02/22/2022] [Indexed: 06/14/2023]
Abstract
This study investigated the prevalence of antibiotic resistance genes (ARGs) in the influent, effluent, and waste activated sludge (WAS) of eight full-scale municipal wastewater treatment plants (WWTPs) in Shanghai, China. A comprehensive understanding of the correlation between various influencing factors (characteristics of wastewater and WAS, antibiotics, metals, mobile genetic elements) and ARGs was explored. Among the eight full-scale WWTPs, the Unitank process was inefficient in removing typical ARGs compared with continuous-flow anaerobic-anoxic-aerobic and oxidation ditch processes. Antibiotic was identified as the most influential factor affecting the occurrence of ARGs in wastewater, followed by flow rate and nutrients. Positive correlations were observed between antibiotics and their corresponding ARGs in the influent, while this correlation disappeared in the WAS. Class I integron, wastewater characteristics (nitrogen and flow rate), antibiotics (ofloxacin, sulfamethazine, and erythromycin), metals (Mg, Al, Fe, and Mn) were identified as crucial factors comprehensively affecting the distribution of ARGs in WAS. Dissimilatory nitrate reduction profoundly influenced the fate of ARGs during wastewater treatment processes, and K04561 (norB), K02567 (napA), K00262 (gdhA), K00284 (gltS) were identified as the most significant genes in the nitrogen metabolism pathway (ko00910). This study provides a new perspective for comprehensively understanding the occurrence and dissemination of ARGs in WWTPs.
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Affiliation(s)
- Qian Ping
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Zhipeng Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China
| | - Liping Ma
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China
| | - Tingting Yan
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China
| | - Lin Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Yongmei Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
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4
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Miloud SB, Dziri O, Ferjani S, Ali MM, Mysara M, Boutiba I, Houdt RVAN, Chouchani C. First Description of Various Bacteria Resistant to Heavy Metals and Antibiotics Isolated from Polluted Sites in Tunisia. Pol J Microbiol 2021; 70:161-174. [PMID: 34335797 PMCID: PMC8318066 DOI: 10.33073/pjm-2021-012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 02/05/2021] [Accepted: 02/15/2021] [Indexed: 01/11/2023] Open
Abstract
Environmental bacteria belonging to various families were isolated from polluted water collected from ten different sites in Tunisia. Sites were chosen near industrial and urban areas known for their high degree of pollution. The aim of this study was to investigate cross-resistance between heavy metals (HM), i.e., silver, mercury and copper (Ag, Hg, and Cu), and antibiotics. In an initial screening, 80 isolates were selected on ampicillin, and 39 isolates, retained for further analysis, could grow on a Tris-buffered mineral medium with gluconate as carbon source. Isolates were identified based on their 16S rRNA gene sequence. Results showed the prevalence of antibiotic resistance genes, especially all isolates harbored the blaTEM gene. Some of them (15.38%) harbored blaSHV. Moreover, several were even ESBLs and MBLs-producers, which can threaten the human health. On the other hand, 92.30%, 56.41%, and 51.28% of the isolates harbored the heavy metals resistance genes silE, cusA, and merA, respectively. These genes confer resistance to silver, copper, and mercury. A cross-resistance between antibiotics and heavy metals was detected in 97.43% of our isolates.
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Affiliation(s)
- Samar Ben Miloud
- Research Laboratory of Environmental Sciences and Technologies, Higher Institute of Environmental Sciences and Technologies of Borj-Cedria, University of Carthage, Hammam-Lif, Tunisia.,Laboratory of Microorganisms and Active Biomolecules, Faculty of Sciences of Tunis, University of Tunis El-Manar, Tunis El-Manar, Tunisia.,Research Laboratory Antibiotic Resistance, Faculty of Medicine of Tunis, Tunisia
| | - Olfa Dziri
- Research Laboratory of Environmental Sciences and Technologies, Higher Institute of Environmental Sciences and Technologies of Borj-Cedria, University of Carthage, Hammam-Lif, Tunisia.,Laboratory of Microorganisms and Active Biomolecules, Faculty of Sciences of Tunis, University of Tunis El-Manar, Tunis El-Manar, Tunisia
| | - Sana Ferjani
- Research Laboratory Antibiotic Resistance, Faculty of Medicine of Tunis, Tunisia
| | - Muntasir Md Ali
- Microbiology Unit, Belgian Nuclear Research Centre (SCK CEN), Mol, Belgium
| | - Mohamed Mysara
- Microbiology Unit, Belgian Nuclear Research Centre (SCK CEN), Mol, Belgium
| | - Ilhem Boutiba
- Research Laboratory Antibiotic Resistance, Faculty of Medicine of Tunis, Tunisia
| | - Rob VAN Houdt
- Microbiology Unit, Belgian Nuclear Research Centre (SCK CEN), Mol, Belgium
| | - Chedly Chouchani
- Research Laboratory of Environmental Sciences and Technologies, Higher Institute of Environmental Sciences and Technologies of Borj-Cedria, University of Carthage, Hammam-Lif, Tunisia.,Laboratory of Microorganisms and Active Biomolecules, Faculty of Sciences of Tunis, University of Tunis El-Manar, Tunis El-Manar, Tunisia
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Hubeny J, Harnisz M, Korzeniewska E, Buta M, Zieliński W, Rolbiecki D, Giebułtowicz J, Nałęcz-Jawecki G, Płaza G. Industrialization as a source of heavy metals and antibiotics which can enhance the antibiotic resistance in wastewater, sewage sludge and river water. PLoS One 2021; 16:e0252691. [PMID: 34086804 PMCID: PMC8177550 DOI: 10.1371/journal.pone.0252691] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 05/19/2021] [Indexed: 11/22/2022] Open
Abstract
The spread of antibiotic resistance is closely related with selective pressure in the environment. Wastewater from industrialized regions is characterized by higher concentrations of these pollutants than sewage from less industrialized areas. The aim of this study was to compare the concentrations of contaminants such as antibiotics and heavy metals (HMs), and to evaluate their impact on the spread of genes encoding resistance to antimicrobial drugs in samples of wastewater, sewage sludge and river water in two regions with different levels of industrialization. The factors exerting selective pressure, which significantly contributed to the occurrence of the examined antibiotic resistance genes (ARGs), were identified. The concentrations of selected gene copy numbers conferring resistance to four groups of antibiotics as well as class 1 and 2 integron-integrase genes were determined in the analyzed samples. The concentrations of six HMs and antibiotics corresponding to genes mediated resistance from 3 classes were determined. Based on network analysis, only some of the analyzed antibiotics correlated with ARGs, while HM levels were correlated with ARG concentrations, which can confirm the important role of HMs in promoting drug resistance. The samples from a wastewater treatment plant (WWTP) located an industrialized region were characterized by higher HM contamination and a higher number of significant correlations between the analyzed variables than the samples collected from a WWTP located in a less industrialized region. These results indicated that treated wastewater released into the natural environment can pose a continuous threat to human health by transferring ARGs, antibiotics and HMs to the environment. These findings shed light on the impact of industrialization on antibiotic resistance dissemination.
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Affiliation(s)
- Jakub Hubeny
- Department of Water Protection Engineering and Environmental Microbiology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Monika Harnisz
- Department of Water Protection Engineering and Environmental Microbiology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
- * E-mail: ,
| | - Ewa Korzeniewska
- Department of Water Protection Engineering and Environmental Microbiology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Martyna Buta
- Department of Water Protection Engineering and Environmental Microbiology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Wiktor Zieliński
- Department of Water Protection Engineering and Environmental Microbiology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Damian Rolbiecki
- Department of Water Protection Engineering and Environmental Microbiology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Joanna Giebułtowicz
- Department of Bioanalysis and Drug Analysis, Faculty of Pharmacy, Medical University of Warsaw, Warszawa, Poland
| | - Grzegorz Nałęcz-Jawecki
- Department of Environmental Health Sciences, Faculty of Pharmacy, Medical University of Warsaw, Warszawa, Poland
| | - Grażyna Płaza
- Faculty of Organization and Management, Silesian University of Technology, Zabrze, Poland
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Overview on the role of heavy metals tolerance on developing antibiotic resistance in both Gram-negative and Gram-positive bacteria. Arch Microbiol 2021; 203:2761-2770. [PMID: 33811263 DOI: 10.1007/s00203-021-02275-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 02/11/2021] [Accepted: 03/10/2021] [Indexed: 12/26/2022]
Abstract
Environmental health is a critical concern, continuously contaminated by physical and biological components (viz., anthropogenic activity), which adversely affect on biodiversity, ecosystems and human health. Nonetheless, environmental pollution has great impact on microbial communities, especially bacteria, which try to evolve in changing environment. For instance, during the course of adaptation, bacteria easily become resistance to antibiotics and heavy metals. Antibiotic resistance genes are now one of the most vital pollutants, provided as a source of frequent horizontal gene transfer. In this review, the environmental cause of multidrug resistance (MDR) that was supposed to be driven by either heavy metals or combination of environmental factors was essentially reviewed, especially focussed on the correlation between accumulation of heavy metals and development of MDR by bacteria. This kind of correlation was seemed to be non-significant, i.e. paradoxical. Gram-positive bacteria accumulating much of toxic heavy metal (i.e. highly stress tolerance) were unlikely to become MDR, whereas Gram-negative bacteria that often avoid accumulation of toxic heavy metal by efflux pump systems were come out to be more prone to MDR. So far, other than antibiotic contaminant, no such available data strongly support the direct influence of heavy metals in bacterial evolution of MDR; combinations of factors may drive the evolution of antibiotic resistance. Therefore, Gram-positive bacteria are most likely to be an efficient member in treatment of industrial waste water, especially in the removal of heavy metals, perhaps inducing the less chance of antibiotic resistance pollution in the environment.
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Molecular characterization, antibiogram and distribution of zntA gene in zinc-resistant Escherichia coli population recovered from anthropogenically-influenced surface water sources in Nigeria. Meta Gene 2020. [DOI: 10.1016/j.mgene.2020.100789] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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8
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Gu R, Gao J, Dong L, Liu Y, Li X, Bai Q, Jia Y, Xiao H. Chromium metabolism characteristics of coexpression of ChrA and ChrT gene. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 204:111060. [PMID: 32768747 DOI: 10.1016/j.ecoenv.2020.111060] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 07/19/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
OBJECTIVE Serratia sp. S2 is a wild strain with chromium resistance and reduction ability. Chromium(VI) metabolic-protein-coding gene ChrA and ChrT were cloned from Serratia sp. S2, and ligated with prokaryotic expression vectors pET-28a (+) and transformed into E. coli BL21 to construct ChrA, ChrT and ChrAT engineered bacteria. By studying the characteristics of Cr(VI) metabolism in engineered bacteria, the function and mechanism of the sole expression and coexpression of ChrA and ChrT genes were studied. METHODS Using Serratia sp. S2 genome as template, ChrA and ChrT genes were amplified by PCR, and prokaryotic expression vectors was ligated to form the recombinant plasmid pET-28a (+)-ChrA, pET-28a (+)-ChrT and pET-28a (+)-ChrAT, and transformed into E. coli BL21 to construct ChrA, ChrT, ChrAT engineered bacteria. The growth curve, tolerance, and reduction of Cr(VI), the distribution of intracellular and extracellular Cr, activity of chromium reductase and intracellular oxidative stress in engineered bacteria were measured to explore the metabolic characteristics of Cr(VI) in ChrA, ChrT, ChrAT engineered bacteria. RESULTS ChrA, ChrT and ChrAT engineered bacteria were successfully constructed by gene recombination technology. The tolerance to Cr(VI) was Serratia sp. S2 > ChrAT ≈ ChrA > ChrT > Control (P < 0.05), and the reduction ability to Cr(VI) was Serratia sp. S2 > ChrAT ≈ ChrT > ChrA (P < 0.05). The chromium distribution experiments confirmed that Cr(VI) and Cr(III) were the main valence states. Effect of electron donors on chromium reductase activity was NADPH > NADH > non-NAD(P)H (P < 0.05). The activity of chromium reductase increased significantly with NAD(P)H (P < 0.05). The Glutathione and NPSH (Non-protein Sulfhydryl) levels of ChrA, ChrAT engineered bacteria increased significantly (P < 0.05) under the condition of Cr(VI), but there was no significant difference in the indexes of ChrT engineered bacteria (P > 0.05). CONCLUSION ChrAT engineered bacteria possesses resistance and reduction abilities of Cr(VI). ChrA protein endows the strain with the ability to resist Cr(VI). ChrT protein reduces Cr(VI) to Cr(III) by using NAD(P)H as electronic donor. The reduction process promotes the production of GSH, GSSG and NPSH to maintain the intracellular reduction state, which further improves the Cr(VI) tolerance and reduction ability of ChrAT engineered bacteria.
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Affiliation(s)
- Ruijia Gu
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China; Center for Disease Control and Prevention of Fucheng District, No.116 north section of Changhong Avenue, Fucheng District, Mianyang City, 621000, China
| | - Jieying Gao
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China
| | - Lanlan Dong
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China; Food and Drugs Authority of Nanchong, No.535 Jinyuling Road, Shunqing District, Nanchong City, 637000, China
| | - Yuan Liu
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China
| | - Xinglong Li
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China
| | - Qunhua Bai
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China
| | - Yan Jia
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China
| | - Hong Xiao
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, No.1 Yixueyuan Road, Yuzhong District, Chongqing, 400016, China.
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Glibota N, Grande MJ, Galvez A, Ortega E. Genetic Determinants for Metal Tolerance and Antimicrobial Resistance Detected in Bacteria Isolated from Soils of Olive Tree Farms. Antibiotics (Basel) 2020; 9:antibiotics9080476. [PMID: 32756388 PMCID: PMC7459592 DOI: 10.3390/antibiotics9080476] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/18/2020] [Accepted: 08/01/2020] [Indexed: 12/12/2022] Open
Abstract
Copper-derived compounds are often used in olive tree farms. In a previous study, a collection of bacterial strains isolated from olive tree farms were identified and tested for phenotypic antimicrobial resistance and heavy metal tolerance. The aim of this work was to study the genetic determinants of resistance and to evaluate the co-occurrence of metal tolerance and antibiotic resistance genes. Both metal tolerance and antibiotic resistance genes (including beta-lactamase genes) were detected in the bacterial strains from Cu-treated soils. A high percentage of the strains positive for metal tolerance genes also carried antibiotic resistance genes, especially for genes involved in resistances to beta-lactams and tetracycline. Significant associations were detected between genes involved in copper tolerance and genes coding for beta-lactamases or tetracycline resistance mechanisms. A significant association was also detected between zntA (coding for a Zn(II)-translocating P-type ATPase) and tetC genes. In conclusion, bacteria from soils of Cu-treated olive farms may carry both metal tolerance and antibiotic resistance genes. The positive associations detected between metal tolerance genes and antibiotic resistance genes suggests co-selection of such genetic traits by exposure to metals.
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Molecular characterization of chromium resistant gram-negative bacteria isolated from industrial effluent: Bioremedial activity. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.08.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Pereira EJ, Ramaiah N. Chromate detoxification potential of Staphylococcus sp. isolates from an estuary. ECOTOXICOLOGY (LONDON, ENGLAND) 2019; 28:457-466. [PMID: 30969406 DOI: 10.1007/s10646-019-02038-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/19/2019] [Indexed: 05/14/2023]
Abstract
Chromium (Cr) pollution is an emerging environmental problem. The present study was carried out to isolate Cr-resistant bacteria and characterize their Cr detoxification and resistance ability. Bacteria screened by exposure to chromate (Cr6+) were isolated from Mandovi estuary Goa, India. Two isolates expressed high resistance to Cr6+ (MIC ≥ 300 µg mL-1), Cr3+ (MIC ≥ 900 µg mL-1), other toxic heavy metals and displayed a pattern of resistance to cephalosporins and ß-lactams. Biochemical and 16 S rRNA gene sequence analysis indicated that both isolates tested belonged to the Staphylococcus genus and were closely related to S. saprophyticus and S. arlettae. Designated as strains NIOER176 and NIOER324, batch experiments demonstrated that both removed 100% of 20 and 50 µg mL-1 Cr6+ within 4 and 10 days, respectively. The rate of reduction in both peaked at 0.260 µg mL-1 h-1. ATP-binding cassette (ABC) transporter gene involved in transport of a variety of substrates including efflux of toxicants was present in strain NIOER176. Through SDS-PAGE analysis, whole-cell proteins extracted from both strains indicated chromium-induced specific induction and up-regulation of 24 and 40 kDa proteins. Since bacterial ability to ameliorate Cr6+ is of practical significance, these findings demonstrate strong potential of some estuarine bacteria to detoxify Cr6+ even when its concentrations far exceed the concentrations reported from many hazardous effluents and chromium contaminated natural habitats. Such potential of salt tolerant bacteria would help in Cr6+ bioremediation efforts.
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Affiliation(s)
- Elroy Joe Pereira
- Biological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India
| | - Nagappa Ramaiah
- Biological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
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Ijoma GN, Selvarajan R, Oyourou JN, Sibanda T, Matambo T, Monanga A, Mkansi K. Exploring the application of biostimulation strategy for bacteria in the bioremediation of industrial effluent. ANN MICROBIOL 2019. [DOI: 10.1007/s13213-019-1443-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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13
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Liu X, Xu J, Zhu J, Du P, Sun A. Combined Transcriptome and Proteome Analysis of RpoS Regulon Reveals Its Role in Spoilage Potential of Pseudomonas fluorescens. Front Microbiol 2019; 10:94. [PMID: 30787912 PMCID: PMC6372562 DOI: 10.3389/fmicb.2019.00094] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 01/16/2019] [Indexed: 12/23/2022] Open
Abstract
Microbial contamination is considered the main cause of food spoilage. Pseudomonas fluorescens is a typical spoilage bacterium contributing to a large extent to the spoilage process of proteinaceous foods. RpoS is known as an alternative sigma factor controlling stress resistance and virulence in many pathogens. Our previous work revealed that RpoS contributes to the spoilage activities of P. fluorescens by regulating resistance to different stress conditions, extracellular acylated homoserine lactone (AHL) levels, extracellular protease and total volatile basic nitrogen (TVB-N) production. However, RpoS-dependent genes in P. fluorescens remained undefined. RNA-seq transcriptomics analysis combined with quantitative proteomics analysis based on multiplexed isobaric tandem mass tag (TMT) labeling was performed in the P. fluorescens wild-type strain UK4 and its derivative carrying an rpoS mutation. A total of 375 differentially expressed coding sequences (DECs) and 212 differentially expressed proteins (DEPs) were identified. The DECs were further verified by qRT-PCR. The combined transcriptome and proteome analyses revealed the involvement of this regulator in several cellular processes, mainly including polysaccharide metabolism, intracellular secretion, extracellular structures, cell wall biogenesis, stress responses, and amino acid and biogenic amine metabolism, which may contribute to the biofilm formation, stress resistance, and spoilage activities of P. fluorescens. Moreover, we indeed observed that RpoS contributed to the production of the macrocolony biofilm's matrix. Our results provide insights into the regulatory network of RpoS and expand the knowledge about the role of RpoS in the functioning of P. fluorescens in food spoilage.
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Affiliation(s)
- Xiaoxiang Liu
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, China
| | - Jun Xu
- Hangzhou Lin'an District People's Hospital, Hangzhou, China
| | - Junli Zhu
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Peng Du
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, China
| | - Aihua Sun
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, China
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Do environmentally induced DNA variations mediate adaptation in Aspergillus flavus exposed to chromium stress in tannery sludge? BMC Genomics 2018; 19:868. [PMID: 30509176 PMCID: PMC6278149 DOI: 10.1186/s12864-018-5244-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 11/14/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Environmental stress induced genetic polymorphisms have been suggested to arbitrate functional modifications influencing adaptations in microbes. The relationship between the genetic processes and concomitant functional adaptation can now be investigated at a genomic scale with the help of next generation sequencing (NGS) technologies. Using a NGS approach we identified genetic variations putatively underlying chromium tolerance in a strain of Aspergillus flavus isolated from a tannery sludge. Correlation of nsSNPs in the candidate genes (n = 493) were investigated for their influence on protein structure and possible function. Whole genome sequencing of chromium tolerant A. flavus strain (TERIBR1) was done (Illumina HiSeq2000). The alignment of quality trimmed data of TERIBR1 with reference NRRL3357 (accession number EQ963472) strain was performed using Bowtie2 version 2.2.8. SNP with a minimum read depth of 5 and not in vicinity (10 bp) of INDEL were filtered. Candidate genes conferring chromium resistance were selected and SNPs were identified. Protein structure modeling and interpretation for protein-ligand (CrO4- 2) docking for selected proteins harbouring non-synonymous substitutions were done using Phyre2 and PatchDock programs. RESULTS High rate of nsSNPs (approximately 11/kb) occurred in selected candidate genes for chromium tolerance. Of the 16 candidate genes selected for studying effect of nsSNPs on protein structure and protein-ligand interaction, four proteins belonging to the Major Facilitator Superfamily (MFS) and recG protein families showed significant interaction with chromium ion only in the chromium tolerant A. flavus strain TERIBR1. CONCLUSIONS Presence of nsSNPs and subsequent amino-acid alterations evidently influenced the 3D structures of the candidate proteins, which could have led to improved interaction with (CrO4- 2) ion. Such structural modifications might have enhanced chromium efflux efficiency of A. flavus (TERIBR1) and thereby offered the adaptation benefits in counteracting chromate stress. Our findings are of fundamental importance to the field of heavy-metal bio-remediation.
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He Y, Dong L, Zhou S, Jia Y, Gu R, Bai Q, Gao J, Li Y, Xiao H. Chromium resistance characteristics of Cr(VI) resistance genes ChrA and ChrB in Serratia sp. S2. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 157:417-423. [PMID: 29655157 DOI: 10.1016/j.ecoenv.2018.03.079] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Revised: 03/27/2018] [Accepted: 03/28/2018] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To find an efficient chromium (VI) resistance system, with a highly efficient, economical, safe, and environmentally friendly chromium-removing strain, ChrA, ChrB, and ChrAB fragments of the chromium (VI) resistance gene in Serratia sp. S2 were cloned, and their prokaryotic expression vectors were constructed and transformed into E. coli BL21. The anti-chromium (VI) capacity and characteristics of engineered bacteria, role of ChrA and ChrB genes in the anti-chromium (VI) processes, and the mechanism of chromium metabolism, were explored. METHODS The PCR technique was used to amplify ChrA, ChrB, and ChrAB genes from the Serratia sp. S2 genome. ChrA, ChrB, and ChrAB genes were connected to the prokaryotic expression vector pET-28a and transferred into E. coli BL21 for prokaryotic expression. Cr-absorption and Cr-efflux ability of the engineered strains were determined. The effects of respiratory inhibitors and oxygenated anions on Cr-efflux of ChrA and ChrB engineered strains were explored. RESULTS ChrA, ChrB, and ChrAB engineered strains were constructed successfully; there was no significant difference between the control strain and the ChrB engineered strain for Cr-metabolism (P > 0.05). Cr-absorption and Cr-efflux of ChrA and ChrAB engineered strains were significantly stronger than the control strain (P < 0.05). Oxyanions (sulfate and molybdate) and inhibitors (valinomycin and CN-) could significantly inhibit the Cr-efflux capacities of ChrA and ChrAB engineered strains (P < 0.05), while NADPH could significantly promote such capacities (P < 0.05). CONCLUSION The Cr-transporter, encoded by ChrA gene, confer the ability to pump out intracellular Cr on ChrA and ChrAB engineered strains. The ChrB gene plays a positive regulatory role in ChrA gene regulation. The Cr-metabolism ability of the ChrAB engineered strain is stronger than the ChrA engineered strain. ChrA and ChrAB genes in the Cr-resistance system may involve a variety of mechanisms, such as sulfate ion channel and respiratory chain electron transfer.
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Affiliation(s)
- Yuan He
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China
| | - Lanlan Dong
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China
| | - Simin Zhou
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China
| | - Yan Jia
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China; Innovation Center for Social Risk Governance in Health, Chongqing Medical University, Chongqing 400016, China
| | - Ruijia Gu
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China
| | - Qunhua Bai
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China; Innovation Center for Social Risk Governance in Health, Chongqing Medical University, Chongqing 400016, China
| | - Jieying Gao
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China; Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing 400016, China
| | - Yingli Li
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China; Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing 400016, China
| | - Hong Xiao
- Department of Health Laboratory Technology, School of Public Health and Management, Chongqing Medical University, Medical 1 Yixueyuan Road, Yuzhong District, Chongqing 400016, China; Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing 400016, China.
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16
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Analysis of the Genome and Chromium Metabolism-Related Genes of Serratia sp. S2. Appl Biochem Biotechnol 2017; 185:140-152. [DOI: 10.1007/s12010-017-2639-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/17/2017] [Indexed: 10/18/2022]
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17
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周 思, 董 兰, 何 元, 肖 虹. [Characterization of chromate resistance in genetically engineered Escherichia coli expressing chromate ion transporter ChrA]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2017; 37:1290-1295. [PMID: 29070456 PMCID: PMC6743972 DOI: 10.3969/j.issn.1673-4254.2017.10.02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To construct a genetically engineered Escherichia coli expressing chromate (Cr) ion transporter ChrA and test its Cr resistance capacity. METHODS ChrA gene was cloned by PCR from the DNA template of Serratia sp. S2 and linked with the prokaryotic vector pET-28a (+). The recombinant vector was transformed into E.coli BL21 (DE3) cells for expression of ChrA protein. Cr (VI) risistance and Cr (VI) uptake and efflux of the engineered bacteria were tested, and the effects of Cr loading time, oxyanions (ulfate, molybdate, vanadate, tungstate), and respiratory inhibitors (valinomycin, CN-, oligomycin, and NADH) on Cr (VI) efflux were examined to analyze the pathway of Cr (VI) transport by ChrA protein. RESULTS The engineered E. coil strain was successfully constructed. Experiments using cell suspensions showed a lowered Cr2O72- uptake but an increased efflux capacity of ChrA-engineered bacteria compared with the control strain (P<0.05). The engineered E. coil cells in exponential growth incubated for 30 min in the presence of 50 mg/L Cr2O72- showed a total displacement of Cr (VI) of 20% after resuspension in PBS at 10 min, but chromate efflux decreased subsequently as the incubation time extended. Oxyanions sulfate and molybdate significantly inhibited chromate efflux in the engineered bacteria (P<0.05), whereas tungstate and vanadate did not obviously affect chromate efflux; chromate efflux was significantly inhibited by K+ ionophore valinomycin and CN-, enhanced by NADH (P<0.05), but not affected by oligomycin, suggesting the role of chromate transporter ChrA as a chemiosmotic pump that extrudes chromate using the proton-motive force. CONCLUSION ChrA can efficiently transport chromate ions from the cytoplasm to enhance chromate resistance of the genetically engineered E. coli.
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Affiliation(s)
- 思敏 周
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
| | - 兰岚 董
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
| | - 元 何
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
| | - 虹 肖
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
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Romero JL, Grande Burgos MJ, Pérez-Pulido R, Gálvez A, Lucas R. Resistance to Antibiotics, Biocides, Preservatives and Metals in Bacteria Isolated from Seafoods: Co-Selection of Strains Resistant or Tolerant to Different Classes of Compounds. Front Microbiol 2017; 8:1650. [PMID: 28912764 PMCID: PMC5583239 DOI: 10.3389/fmicb.2017.01650] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Accepted: 08/15/2017] [Indexed: 11/30/2022] Open
Abstract
Multi-drug resistant bacteria (particularly those producing extended-spectrum β-lactamases) have become a major health concern. The continued exposure to antibiotics, biocides, chemical preservatives, and metals in different settings such as the food chain or in the environment may result in development of multiple resistance or co-resistance. The aim of the present study was to determine multiple resistances (biocides, antibiotics, chemical preservatives, phenolic compounds, and metals) in bacterial isolates from seafoods. A 75.86% of the 87 isolates studied were resistant to at least one antibiotic or one biocide, and 6.90% were multiply resistant to at least three biocides and at least three antibiotics. Significant (P < 0.05) moderate or strong positive correlations were detected between tolerances to biocides, between antibiotics, and between antibiotics with biocides and other antimicrobials. A sub-set of 30 isolates selected according to antimicrobial resistance profile and food type were identified by 16S rDNA sequencing and tested for copper and zinc tolerance. Then, the genetic determinants for biocide and metal tolerance and antibiotic resistance were investigated. The selected isolates were identified as Pseudomonas (63.33%), Acinetobacter (13.33%), Aeromonas (13.33%), Shewanella, Proteus and Listeria (one isolate each). Antibiotic resistance determinants detected included sul1 (43.33% of tested isolates), sul2 (6.66%), blaTEM (16.66%), blaCTX-M (16.66%), blaPSE (10.00%), blaIMP (3.33%), blaNDM-1 (3.33%), floR (16.66%), aadA1 (20.0%), and aac(6')-Ib (16.66%). The only biocide resistance determinant detected among the selected isolates was qacEΔ1 (10.00%). A 23.30 of the selected isolates were able to grow on media containing 32 mM copper sulfate, and 46.60% on 8 mM zinc chloride. The metal resistance genes pcoA/copA, pcoR, and chrB were detected in 36.66, 6.66, and 13.33% of selected isolates, respectively. Twelve isolates tested positive for both metal and antibiotic resistance genes, including one isolate positive for the carbapenemase gene blaNDM-1 and for pcoA/copA. These results suggest that exposure to metals could co-select for antibiotic resistance and also highlight the potential of bacteria on seafoods to be involved in the transmission of antimicrobial resistance genes.
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Affiliation(s)
| | | | | | - Antonio Gálvez
- Microbiology Division, Department of Health Sciences, University of JaenJaen, Spain
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Liu X, Yin H, Tang S, Feng M, Peng H, Lu G, Liu Z, Dang Z. Effects of single and combined copper/perfluorooctane sulfonate on sequencing batch reactor process and microbial community in activated sludge. BIORESOURCE TECHNOLOGY 2017; 238:407-415. [PMID: 28458174 DOI: 10.1016/j.biortech.2017.04.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 04/10/2017] [Accepted: 04/12/2017] [Indexed: 06/07/2023]
Abstract
Long-term exposure experiments with single and combined pollutants of copper (Cu)/perfluorooctane sulfonate (PFOS) were conducted to explore the influence on activated sludge in SBRs. Compared with the control, the removal of organics, nitrogen and phosphorus in the presence of PFOS exhibited no apparent difference, but reduced in different degrees when Cu and Cu/PFOS existed. PFOS exposure deteriorated the settling performance of activated sludge with SVI value and amount of extracellular polymeric substance (EPS) increasing, but posed little impacts on microbial activity (dehydrogenase, protease) and antioxidant activity (SOD, CAT). Under Cu and Cu/PFOS loading, dehydrogenase and protease activity were observed to decrease as well as SOD and CAT activity. The sequencing results revealed that bacterial richness and community diversity reduced under Cu and Cu/PFOS exposure. Overall, adverse effect of combined pollution was lower than that of single Cu in long-time due to antagonistic effect existed between Cu and PFOS.
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Affiliation(s)
- Xintong Liu
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Hua Yin
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| | - Shaoyu Tang
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Mi Feng
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Hui Peng
- Department of Chemistry, Jinan University, Guangzhou 510632, Guangdong, China
| | - Guining Lu
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Zehua Liu
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Zhi Dang
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
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Cidre I, Pulido RP, Burgos MJG, Gálvez A, Lucas R. Copper and Zinc Tolerance in Bacteria Isolated from Fresh Produce. J Food Prot 2017; 80:969-975. [PMID: 28467185 DOI: 10.4315/0362-028x.jfp-16-513] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The continued agricultural exposure of bacteria to metals such as copper and zinc may result in an increased copper tolerance through the food chain. The aim of this study was to determine the Cu and Zn tolerance of bacteria from fresh produce (cucumber, zucchini, green pepper, tomato, lettuce, vegetable salad, broccoli, cabbage, carrot, green onion, onion, and mango). Isolates (506 aerobic mesophiles) from 12 different food produce products were tested for growth in a range of Cu and Zn concentrations. Selected isolates were identified using 16S rDNA sequencing, and the presence of metal resistance genes was studied using PCR amplification. More than 50% of the isolates had MICs for copper sulfate greater than 16 mM, and more than 40% had MICs greater than 4 mM for zinc chloride. Isolates with high levels of tolerance to Cu and Zn were detected in all the produce products investigated. A selection of 51 isolates with high MICs for both Cu and Zn were identified as belonging to the genera Pseudomonas (28), Enterobacter (7), Serratia (4), Leclercia (1), Bacillus (10), and Paenibacillus (1). A study of the genetic determinants of resistance in the selected gram-negative isolates revealed a high incidence of genes from the pco multicopper oxidase cluster, from the sil cluster involved in Cu and silver resistance, and from the chromate resistance gene chrB. A high percentage carried both pco and sil. The results suggest that Cu and Zn tolerance, as well as metal resistance genes, is widespread in bacteria from fresh produce.
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Affiliation(s)
- Ismael Cidre
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Edif. B3, Universidad de Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
| | - Rubén Pérez Pulido
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Edif. B3, Universidad de Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
| | - Maria José Grande Burgos
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Edif. B3, Universidad de Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
| | - Antonio Gálvez
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Edif. B3, Universidad de Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
| | - Rosario Lucas
- Área de Microbiología, Departamento de Ciencias de la Salud, Facultad de Ciencias Experimentales, Edif. B3, Universidad de Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain
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21
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Xu YB, Hou MY, Li YF, Huang L, Ruan JJ, Zheng L, Qiao QX, Du QP. Distribution of tetracycline resistance genes and AmpC β-lactamase genes in representative non-urban sewage plants and correlations with treatment processes and heavy metals. CHEMOSPHERE 2017; 170:274-281. [PMID: 28012421 DOI: 10.1016/j.chemosphere.2016.12.027] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/05/2016] [Accepted: 12/07/2016] [Indexed: 05/21/2023]
Abstract
The mixed development of livestock breeding and industry in non-urban zones is a very general phenomenon in China. Distribution of antibiotic resistance genes (ARGs) in non-urban sewage treatment systems has not been paid enough attentions. In this study, eleven tetracycline resistance genes (tetA, tetB, tetC, tetE, tetG, tetL, tetM, tetO, tetQ, tetS and tetX), four AmpC β-lactamase genes (EBC, MOX, FOX and CIT) and four heavy metals (Cu, Zn, Cd and Pb) were detected and analyzed in four non-urban sewage plants with different sewage sources and different treatment processes in Guangzhou. The results showed that tetA and tetC were the most prevalent tetracycline resistance genes with the same detection frequency of 85% and EBC was the most prevalent AmpC β-lactamase gene with a detection frequency of 75%. The relative abundance of tetracycline resistance genes was approximately 1.6 orders of magnitudes higher than that of AmpC β-lactamase genes in all samples. A/O was the most effective process for the non-urban sewage plant receiving industrial or agricultural wastewater. Sedimentation was the most key process to eliminate ARGs from liquid phase. Most ARGs were carried in excess sludge rather than effluent. Significant correlation was found between the tet gene and Zn (r = 0.881, p < 0.01), followed by the AmpC gene and Cu (r = 0.847, p < 0.01), the tet gene and Cu (r = 0.714, p < 0.05). Therefore, the pollution of ARGs in the sewage treatment systems of non-urban zones co-polluted by heavy metals should be paid more attentions.
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Affiliation(s)
- Yan-Bin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Mao-Yu Hou
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Ya-Fei Li
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Lu Huang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Jing-Jing Ruan
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Li Zheng
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Qing-Xia Qiao
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Qing-Ping Du
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
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Sun H, He X, Ye L, Zhang XX, Wu B, Ren H. Diversity, abundance, and possible sources of fecal bacteria in the Yangtze River. Appl Microbiol Biotechnol 2016; 101:2143-2152. [DOI: 10.1007/s00253-016-7998-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 10/29/2016] [Accepted: 11/05/2016] [Indexed: 11/30/2022]
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Dynamics of the diversity and structure of the overall and nitrifying microbial community in activated sludge along gradient copper exposures. Appl Microbiol Biotechnol 2016; 100:6881-6892. [DOI: 10.1007/s00253-016-7529-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2015] [Revised: 03/31/2016] [Accepted: 04/05/2016] [Indexed: 02/01/2023]
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Genetic basis and importance of metal resistant genes in bacteria for bioremediation of contaminated environments with toxic metal pollutants. Appl Microbiol Biotechnol 2016; 100:2967-84. [PMID: 26860944 DOI: 10.1007/s00253-016-7364-4] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 01/26/2016] [Accepted: 01/28/2016] [Indexed: 10/22/2022]
Abstract
Metal pollution is one of the most persistent and complex environmental issues, causing threat to the ecosystem and human health. On exposure to several toxic metals such as arsenic, cadmium, chromium, copper, lead, and mercury, several bacteria has evolved with many metal-resistant genes as a means of their adaptation. These genes can be further exploited for bioremediation of the metal-contaminated environments. Many operon-clustered metal-resistant genes such as cadB, chrA, copAB, pbrA, merA, and NiCoT have been reported in bacterial systems for cadmium, chromium, copper, lead, mercury, and nickel resistance and detoxification, respectively. The field of environmental bioremediation has been ameliorated by exploiting diverse bacterial detoxification genes. Genetic engineering integrated with bioremediation assists in manipulation of bacterial genome which can enhance toxic metal detoxification that is not usually performed by normal bacteria. These techniques include genetic engineering with single genes or operons, pathway construction, and alternations of the sequences of existing genes. However, numerous facets of bacterial novel metal-resistant genes are yet to be explored for application in microbial bioremediation practices. This review describes the role of bacteria and their adaptive mechanisms for toxic metal detoxification and restoration of contaminated sites.
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