1
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Wang L, Li H, Chen J, Wang Y, Gu Y, Jiu M. Antibacterial Mechanisms and Antivirulence Activities of Oridonin against Pathogenic Aeromonas hydrophila AS 1.1801. Microorganisms 2024; 12:415. [PMID: 38399819 PMCID: PMC10891661 DOI: 10.3390/microorganisms12020415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/08/2024] [Accepted: 02/15/2024] [Indexed: 02/25/2024] Open
Abstract
Aeromonas hydrophila, a Gram-negative bacterium widely found in freshwater environments, acts as a common conditional pathogen affecting humans, livestock, and aquatic animals. In this study, the impact of oridonin, an ent-kaurane diterpenoid compound derived from Rabdosia rubescens, on the virulence factors of A. hydrophila AS 1.1801 and its antibacterial mechanism was elucidated. The minimum inhibitory concentration (MIC) of oridonin against A. hydrophila AS 1.1801 was 100 μg/mL. Oridonin at inhibitory concentrations could significantly increase the electrical conductivity in the supernatant and escalate nucleic acid leakage (p < 0.01). This effect was concomitant with observed distortions in bacterial cells, the formation of cytoplasmic cavities, cellular damage, and pronounced inhibition of protein and nucleic acid synthesis. Additionally, oridonin at inhibitory levels exhibited a noteworthy suppressive impact on A. hydrophila AS 1.1801 across biofilm formation, motility, hemolytic activity, lipase activity, and protease activity (p < 0.05), demonstrating a dose-dependent enhancement. qRT-PCR analysis showed that the gene expression of luxR, qseB and omp were significantly downregulated after oridonin treatment in A. hydrophila AS 1.1801 (p < 0.05). Our results indicated that oridonin possessed significant antibacterial and anti-virulence effects on A. hydrophila AS 1.1801.
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Affiliation(s)
- Lunji Wang
- Key Laboratory of Microbial Resources Development and Utilization, Henan University of Science and Technology, Luoyang 471023, China; (L.W.); (J.C.)
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471023, China; (H.L.); (Y.W.); (Y.G.)
| | - Huijuan Li
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471023, China; (H.L.); (Y.W.); (Y.G.)
| | - Jinhao Chen
- Key Laboratory of Microbial Resources Development and Utilization, Henan University of Science and Technology, Luoyang 471023, China; (L.W.); (J.C.)
| | - Yi Wang
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471023, China; (H.L.); (Y.W.); (Y.G.)
| | - Yuqing Gu
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471023, China; (H.L.); (Y.W.); (Y.G.)
| | - Min Jiu
- Key Laboratory of Microbial Resources Development and Utilization, Henan University of Science and Technology, Luoyang 471023, China; (L.W.); (J.C.)
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2
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Lv L, Wei Z, Li W, Chen J, Tian Y, Gao W, Wang P, Sun L, Ren Z, Zhang G, Liu X, Ngo HH. Regulation of extracellular polymers based on quorum sensing in wastewater biological treatment from mechanisms to applications: A critical review. WATER RESEARCH 2024; 250:121057. [PMID: 38157601 DOI: 10.1016/j.watres.2023.121057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/21/2023] [Accepted: 12/22/2023] [Indexed: 01/03/2024]
Abstract
Extracellular polymeric substances (EPS) regulated by quorum sensing (QS) could directly mediate adhesion between microorganisms and form tight microbial aggregates. Besides, EPS have redox properties, which can facilitate electron transfer for promoting electroactive bacteria. Currently, the applications research on improving wastewater biological treatment performance based on QS regulated EPS have been widely reported, but reviews on the level of QS regulated EPS to enhance EPS function in microbial systems are still lacking. This work proposes the potential mechanisms of EPS synthesis by QS regulation from the viewpoint of material metabolism and energy metabolism, and summarizes the effects of QS on EPS synthesis. By synthesizing the role of QS in EPS regulation, we further point out the applications of QS-regulated EPS in wastewater biological treatment, which involve a series of aspects such as strengthening microbial colonization, mitigating membrane biofouling, improving the shock resistance of microbial metabolic systems, and strengthening the electron transfer capacity of microbial metabolic systems. According to this comprehensive review, future research on QS-regulated EPS should focus on the exploration of the micro-mechanisms, and economic regulation strategies for QS-regulated EPS should be developed, while the stability of QS-regulated EPS in long-term production experimental research should be further demonstrated.
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Affiliation(s)
- Longyi Lv
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Ziyin Wei
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Weiguang Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China
| | - Jiarui Chen
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Yu Tian
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China
| | - Wenfang Gao
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Pengfei Wang
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Li Sun
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Zhijun Ren
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Guangming Zhang
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China.
| | - Xiaoyang Liu
- Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China.
| | - Huu Hao Ngo
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
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3
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Ashikur Rahman M, Akter S, Ashrafudoulla M, Anamul Hasan Chowdhury M, Uddin Mahamud AGMS, Hong Park S, Ha SD. Insights into the mechanisms and key factors influencing biofilm formation by Aeromonas hydrophila in the food industry: A comprehensive review and bibliometric analysis. Food Res Int 2024; 175:113671. [PMID: 38129021 DOI: 10.1016/j.foodres.2023.113671] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 11/01/2023] [Accepted: 11/03/2023] [Indexed: 12/23/2023]
Abstract
Biofilm formation by Aeromonas hydrophila in the food industry poses significant challenges to food safety and quality. Therefore, this comprehensive review aimed to provide insights into the mechanisms and key factors influencing A. hydrophila biofilm formation. It explores the molecular processes involved in initial attachment, microcolony formation, and biofilm maturation; moreover, it concurrently examines the impact of intrinsic factors, including quorum sensing, cyclic-di-GMP, the efflux pump, and antibiotic resistance, as well as environmental conditions, such as temperature, nutrient availability, and osmotic pressure, on biofilm architecture and resilience. Furthermore, the article highlights the potential of bibliometric analysis as a promising method for conceptualizing the research landscape of and identifying knowledge gaps in A. hydrophila biofilm research. The findings underscore the requirement for focused interventions that prevent biofilm development and raise food sector safety. The consolidation of current information and incorporation of bibliometric analysis enhances existing understanding of A. hydrophila biofilm formation and offers insights for future research and control strategies within a food industry context.
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Affiliation(s)
- Md Ashikur Rahman
- School of Food Science and Technology, Chung-Ang University, Anseong-Si, Republic of Korea; Bangladesh Fisheries Research Institute, Bangladesh
| | - Shirin Akter
- School of Food Science and Technology, Chung-Ang University, Anseong-Si, Republic of Korea; Department of Fisheries and Marine Bioscience, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, Bangladesh
| | - Md Ashrafudoulla
- School of Food Science and Technology, Chung-Ang University, Anseong-Si, Republic of Korea
| | | | | | - Si Hong Park
- Food Science and Technology, Oregon State University, Corvallis, OR, USA
| | - Sang-Do Ha
- School of Food Science and Technology, Chung-Ang University, Anseong-Si, Republic of Korea.
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4
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Verma S, Kuila A, Jacob S. Role of Biofilms in Waste Water Treatment. Appl Biochem Biotechnol 2023; 195:5618-5642. [PMID: 36094648 DOI: 10.1007/s12010-022-04163-5] [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] [Accepted: 08/28/2022] [Indexed: 11/02/2022]
Abstract
Biofilm cells have a different physiology than planktonic cells, which has been the focus of most research. Biofilms are complex biostructures that form on any surface that comes into contact with water on a regular basis. They are dynamic, structurally complex systems having characteristics of multicellular animals and multiple ecosystems. The three themes covered in this review are biofilm ecology, biofilm reactor technology and design, and biofilm modeling. Membrane-supported biofilm reactors, moving bed biofilm reactors, granular sludge, and integrated fixed-film activated sludge processes are all examples of biofilm reactors used for water treatment. Biofilm control and/or beneficial application in membrane processes are improving. Biofilm models have become critical tools for biofilm foundational research as well as biofilm reactor architecture and design. At the same time, the differences between biofilm modeling and biofilm reactor modeling methods are acknowledged.
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Affiliation(s)
- Samakshi Verma
- Department of Bioscience and Biotechnology, Banasthali Vidyapith, Rajasthan, 304022, India
| | - Arindam Kuila
- Department of Bioscience and Biotechnology, Banasthali Vidyapith, Rajasthan, 304022, India.
| | - Samuel Jacob
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Chengalpattu Dist., Kattankulathur, 603203, Tamil Nadu, India.
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5
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Liu S, Liu B, Zhu Y, Qiu Y, Li B. The Spatial-Temporal Effects of Bacterial Growth Substrates on Antibiotic Resistance Gene Spread in the Biofilm. Antibiotics (Basel) 2023; 12:1154. [PMID: 37508250 PMCID: PMC10376823 DOI: 10.3390/antibiotics12071154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 06/28/2023] [Accepted: 06/30/2023] [Indexed: 07/30/2023] Open
Abstract
Biofilm is considered as the hotspot of antibiotic resistance gene (ARG) dissemination. Bacterial growth substrates are important factors for biofilm formation, but its spatial-temporal effects on ARG spread in biofilm is still unclear. In this study, microfluidics combined with microscopic observation were used to reveal spatial-temporal effects of bacterial growth substrates on ARG transfer at real time. The initial horizontal gene transfer events were found to be independent of substrate levels. However, subsequent transfer processes varied greatly depending on the availability of growth substrates. The proportion of transconjugants was much higher (~12%) when observed in substrate-rich regions (under the channel) at 24 h, followed by an exponential decline, with the distance far from the channel. Furthermore, three-dimensional observation revealed that vertical gene transfer influenced by the concentrations of bacterial growth substrates was important for ARG spread in biofilm. The transfer frequency was 8.2 times higher in the high substrate concentration (50×) compared to low concentration (0.5×) in simulated sewage, underscoring the substantial impact of bacterial growth substrate variability on ARG dissemination. This study is helpful for in-depth understanding of ARG dissemination through biofilms and indicates that reducing pollutant emission is important for ARG control in the environment.
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Affiliation(s)
- Shuzhen Liu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Bingwen Liu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Yin Zhu
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Yong Qiu
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Bing Li
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
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6
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Wang W, Cao Y, Li J, Lu S, Ge H, Pan S, Pan X, Wang L. The impact of osmotic stresses on the biofilm formation, immunodetection, and morphology of Aeromonas hydrophila. Microbiol Res 2023; 269:127301. [PMID: 36689842 DOI: 10.1016/j.micres.2023.127301] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/29/2022] [Accepted: 01/09/2023] [Indexed: 01/15/2023]
Abstract
Aeromonas hydrophila (Ah) is a zoonotic pathogen of great importance to aquaculture and human health. This study systematically evaluated the impact of salinity, sugar, ammonia nitrogen, and nitric nitrogen levels on the fitness of Ah by using Luria-Bertani (LB) broth supplemented with different concentrations of NaCl, sucrose, NH4Cl, urea, NaNO2 or NaNO3. Results showed that the static biofilm formation of Ah was higher at 28 °C compared to 37 °C (P < 0.05). At 28 °C, as the NaCl (>1 %) and sucrose levels increased, the Ah biofilm formation and the binding between Ah cells and monoclonal antibodies (mAbs, for immunodetection) decreased. Elevated ammonia nitrogen and nitric nitrogen levels generated no significant impact on Ah biofilm formation or immunodetection (P > 0.05). The expression of mAbs-targeted Omp remained unchanged under high NaCl or sucrose conditions. Further analysis showed that high sucrose conditions led to the over-expression of the extracellular polysaccharides (PS) and promoted the formation of capsule-like structures. These over-expressed PS and capsule structures might be one reason explaining the inhibited immunodetection efficacy. Results generated from this study provide crucial insights for the design of recovery and detection protocols for Ah present in food or environmental samples.
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Affiliation(s)
- Wenbin Wang
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Key Laboratory of Healthy Freshwater Aquaculture, Ministry of Agriculture and Rural Affairs; Key Laboratory of Fish Health and Nutrition of Zhejiang Province; Zhejiang Institute of Freshwater Fisheries, Huzhou, China; Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu, China
| | - Ye Cao
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu, China
| | - Jing Li
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu, China
| | - Shuaichen Lu
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu, China
| | - Hongxing Ge
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu, China
| | - Saikun Pan
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Key Laboratory of Healthy Freshwater Aquaculture, Ministry of Agriculture and Rural Affairs; Key Laboratory of Fish Health and Nutrition of Zhejiang Province; Zhejiang Institute of Freshwater Fisheries, Huzhou, China; Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang, Jiangsu, China; Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu, China
| | - Xiaoyi Pan
- Key Laboratory of Healthy Freshwater Aquaculture, Ministry of Agriculture and Rural Affairs; Key Laboratory of Fish Health and Nutrition of Zhejiang Province; Zhejiang Institute of Freshwater Fisheries, Huzhou, China.
| | - Luxin Wang
- Department of Food Science and Technology, University of California Davis, Davis, CA 95616, USA.
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7
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Lu H, Sun Y, Wang X, Lu Z, Zhu J. Transcriptomics reveal the antibiofilm mechanism of NaCl combined with citral against Vibrio parahaemolyticus. Appl Microbiol Biotechnol 2022; 107:313-326. [DOI: 10.1007/s00253-022-12286-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 11/05/2022] [Accepted: 11/08/2022] [Indexed: 11/24/2022]
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8
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Ou D, Hu C, Liu Y. Metagenomics unraveled the characteristics and microbial response to hypersaline stress in salt-tolerant aerobic granular sludge. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 321:115950. [PMID: 35988403 DOI: 10.1016/j.jenvman.2022.115950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/17/2022] [Accepted: 08/02/2022] [Indexed: 06/15/2023]
Abstract
In this study, the salt-tolerant aerobic granular sludge (SAGS) was cultivated with the increased salinity (0-9% NaCl), showing oval shape, and clear outline. The related sludge characteristics in the formation process of SAGS as well as the effects of salinity on the performance (removal ability, sludge biomass and EPS component) of SAGS were evaluated. Increased salinity accelerated the formation of SAGS, and resulted in the excess secretion of EPS. Relationship between EPS and settling capacity of SAGS was determined, with the increase of salinity, SVI decreased linearly and the sedimentation performance of granular sludge was enhanced. Pearson correlation analysis showed that shorter settling time (3 min) and longer anaerobic influent time (30 min) were beneficial to the operation of SAGS reactor. Metagenomics results showed that the SAGS was dominated by Candida, Halomonas and other salt-tolerant bacteria, the enrichment of these salt-tolerant microbes played an important role in maintaining the stability of granular sludge system and improving the overall salt-tolerant performance. Compared with S9 samples, the proteome regulation in S0 sample was more active and the abundance of Cell motility related proteins was 5 times higher than that in S9 samples. Extracellular structure related proteins was more active in S9, and its abundance was 3.6 times that of S0.
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Affiliation(s)
- Dong Ou
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, PR China
| | - Changwei Hu
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, 314001, PR China.
| | - Yongdi Liu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, PR China; National Engineering Laboratory for Industrial Wastewater Treatment, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, PR China.
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9
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Xiao G, Zheng X, Li J, Yang Y, Yang J, Xiao N, Liu J, Sun Z. Contribution of the EnvZ/OmpR two-component system to growth, virulence and stress tolerance of colistin-resistant Aeromonas hydrophila. Front Microbiol 2022; 13:1032969. [PMID: 36312957 PMCID: PMC9597241 DOI: 10.3389/fmicb.2022.1032969] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 09/26/2022] [Indexed: 01/07/2024] Open
Abstract
Aeromonas hydrophila is an important zoonotic pathogen responsible for septicemia, diarrhea and gastroenteritis, and has attracted considerable attention. The EnvZ/OmpR two-component system (TCS) mediates environmental stress responses in gram-negative bacteria. We investigated the role of the TCS in A. hydrophila by comparing the characteristics of the parental (23-C-23), EnvZ/OmpR knockout (23-C-23:ΔEnvZ/OmpR), and complemented strains (23-C-23:CΔEnvZ/OmpR). Under non-stress conditions, the 23-C-23:ΔEnvZ/OmpR strain showed a significant decrease in growth rate compared to that of 23-C-23. Transcriptome and metabonomic analysis indicated that many metabolic pathways were remarkably affected in the ΔEnvZ/OmpR strain, including the TCA cycle and arginine biosynthesis. In addition, the virulence of the ΔEnvZ/OmpR strain was attenuated in a Kunming mouse model. The ΔEnvZ/OmpR strain exhibited notably reduced tolerance to environmental stresses, including high temperature, different pH conditions, oxidative stress, and high osmotic stress. The downregulated expression of genes related to cell metabolism, motility, and virulence in the ΔEnvZ/OmpR mutant strain was further validated by real-time quantitative PCR. Consequently, our data suggest that the EnvZ/OmpR TCS is required for growth, motility, virulence, and stress response in A. hydrophila, which has significant implications in the development of novel antibacterial and vaccine therapies targeting EnvZ/OmpR against A. hydrophila.
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Affiliation(s)
- Gang Xiao
- College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
- Hunan Engineering Technology Research Center of Veterinary Drugs, Hunan Agricultural University, Changsha, China
| | - Xiaofeng Zheng
- College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
- Hunan Engineering Technology Research Center of Veterinary Drugs, Hunan Agricultural University, Changsha, China
| | - Jiyun Li
- College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
- Hunan Engineering Technology Research Center of Veterinary Drugs, Hunan Agricultural University, Changsha, China
| | - Yang Yang
- College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
| | - Jie Yang
- College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
- Hunan Engineering Technology Research Center of Veterinary Drugs, Hunan Agricultural University, Changsha, China
| | - Ning Xiao
- College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
- Hunan Engineering Technology Research Center of Veterinary Drugs, Hunan Agricultural University, Changsha, China
| | - Junqi Liu
- Veterinary Drug Laboratory, Hunan Institute of Animal and Veterinary Science, Changsha, China
| | - Zhiliang Sun
- College of Veterinary Medicine, Hunan Agricultural University, Changsha, China
- Hunan Engineering Technology Research Center of Veterinary Drugs, Hunan Agricultural University, Changsha, China
- National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients, Hunan Agricultural University, Changsha, China
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10
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Yan C, Li X, Zhang G, Bi J, Hao H, Hou H. Quorum Sensing (QS)-regulated target predictions of Hafnia alvei H4 based on the joint application of genome and STRING database. Food Res Int 2022; 157:111356. [DOI: 10.1016/j.foodres.2022.111356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 05/03/2022] [Accepted: 05/10/2022] [Indexed: 11/25/2022]
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11
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Electrochemical Control of Biofilm Formation and Approaches to Biofilm Removal. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12136320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This review deals with microbial adhesion to metal-based surfaces and the subsequent biofilm formation, showing that both processes are a serious problem in the food industry, where pathogenic microorganisms released from the biofilm structure may pollute food and related material during their production. Biofilm exhibits an increased resistance toward sanitizers and disinfectants, which complicates the removal or inactivation of microorganisms in these products. In the existing traditional techniques and modern approaches for clean-in-place, electrochemical biofilm control offers promising technology, where surface properties or the reactions taking place on the surface are controlled to delay or prevent cell attachment or to remove microbial cells from the surface. In this overview, biofilm characterization, the classification of bacteria-forming biofilms, the influence of environmental conditions for bacterial attachment to material surfaces, and the evaluation of the role of biofilm morphology are described in detail. Health aspects, biofilm control methods in the food industry, and conventional approaches to biofilm removal are included as well, in order to consider the possibilities and limitations of various electrochemical approaches to biofilm control with respect to potential applications in the food industry.
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12
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Li Y, Feng T, Wang Y. The role of bacterial signaling networks in antibiotics response and resistance regulation. MARINE LIFE SCIENCE & TECHNOLOGY 2022; 4:163-178. [PMID: 37073223 PMCID: PMC10077285 DOI: 10.1007/s42995-022-00126-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 01/07/2022] [Indexed: 05/03/2023]
Abstract
Excessive use of antibiotics poses a threat to public health and the environment. In ecosystems, such as the marine environment, antibiotic contamination has led to an increase in bacterial resistance. Therefore, the study of bacterial response to antibiotics and the regulation of resistance formation have become an important research field. Traditionally, the processes related to antibiotic responses and resistance regulation have mainly included the activation of efflux pumps, mutation of antibiotic targets, production of biofilms, and production of inactivated or passivation enzymes. In recent years, studies have shown that bacterial signaling networks can affect antibiotic responses and resistance regulation. Signaling systems mostly alter resistance by regulating biofilms, efflux pumps, and mobile genetic elements. Here we provide an overview of how bacterial intraspecific and interspecific signaling networks affect the response to environmental antibiotics. In doing so, this review provides theoretical support for inhibiting bacterial antibiotic resistance and alleviating health and ecological problems caused by antibiotic contamination.
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Affiliation(s)
- Yuying Li
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003 China
- Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003 China
| | - Tao Feng
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003 China
- Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003 China
| | - Yan Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266003 China
- Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Ecology and Environmental Science, National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266071 China
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13
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Hieu DQ, Hang BTB, Lokesh J, Garigliany MM, Huong DTT, Yen DT, Liem PT, Tam BM, Hai DM, Son VN, Phuong NT, Farnir F, Kestemont P. Salinity significantly affects intestinal microbiota and gene expression in striped catfish juveniles. Appl Microbiol Biotechnol 2022; 106:3245-3264. [PMID: 35366085 DOI: 10.1007/s00253-022-11895-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 03/08/2022] [Accepted: 03/19/2022] [Indexed: 12/17/2022]
Abstract
In the present study, juvenile striped catfish (Pangasianodon hypophthalmus), a freshwater fish species, have been chronically exposed to a salinity gradient from freshwater to 20 psu (practical salinity unit) and were sampled at the beginning (D20) and the end (D34) of exposure. The results revealed that the intestinal microbial profile of striped catfish reared in freshwater conditions were dominated by the phyla Bacteroidetes, Firmicutes, Proteobacteria, and Verrucomicrobia. Alpha diversity measures (observed OTUs (operational taxonomic units), Shannon and Faith's PD (phylogenetic diversity)) showed a decreasing pattern as the salinities increased, except for the phylogenetic diversity at D34, which was showing an opposite trend. Furthermore, the beta diversity between groups was significantly different. Vibrio and Akkermansia genera were affected differentially with increasing salinity, the former being increased while the latter was decreased. The genus Sulfurospirillium was found predominantly in fish submitted to salinity treatments. Regarding the host response, the fish intestine likely contributed to osmoregulation by modifying the expression of osmoregulatory genes such as nka1a, nka1b, slc12a1, slc12a2, cftr, and aqp1, especially in fish exposed to 15 and 20 psu. The expression of heat shock proteins (hsp) hsp60, hsp70, and hsp90 was significantly increased in fish reared in 15 and 20 psu. On the other hand, the expression of pattern recognition receptors (PRRs) were inhibited in fish exposed to 20 psu at D20. In conclusion, the fish intestinal microbiota was significantly disrupted in salinities higher than 10 psu and these effects were proportional to the exposure time. In addition, the modifications of intestinal gene expression related to ion exchange and stressful responses may help the fish to adapt hyperosmotic environment. KEY POINTS: • It is the first study to provide detailed information on the gut microbiota of fish using the amplicon sequencing method. • Salinity environment significantly modified the intestinal microbiota of striped catfish. • Intestinal responses may help the fish adapt to hyperosmotic environment.
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Affiliation(s)
- Dang Quang Hieu
- Research Unit in Environmental and Evolutionary Biology, Institute of Life Earth & Environment (ILEE), University of Namur, Namur, Belgium.
| | - Bui Thi Bich Hang
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam
| | - Jep Lokesh
- Université de Pau Et Des Pays de L'Adour, Saint-Pee-sur-Nivelle, E2S UPPA, INRAE, NuMéA, France
| | - Mutien-Marie Garigliany
- Department of Pathology, Faculty of Veterinary Medicine, University of Liège, Liege, Belgium
| | - Do Thi Thanh Huong
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam
| | - Duong Thuy Yen
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam
| | - Pham Thanh Liem
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam
| | - Bui Minh Tam
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam
| | - Dao Minh Hai
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam.,Department of Animal Production, Faculty of Veterinary Medicine, University of Liège, Liege, Belgium
| | - Vo Nam Son
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam
| | - Nguyen Thanh Phuong
- College of Aquaculture and Fisheries, Can Tho University, Can Tho City, Vietnam
| | - Frédéric Farnir
- Department of Animal Production, Faculty of Veterinary Medicine, University of Liège, Liege, Belgium
| | - Patrick Kestemont
- Research Unit in Environmental and Evolutionary Biology, Institute of Life Earth & Environment (ILEE), University of Namur, Namur, Belgium.
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14
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Hossain MI, Mizan MFR, Roy PK, Nahar S, Toushik SH, Ashrafudoulla M, Jahid IK, Lee J, Ha SD. Listeria monocytogenes biofilm inhibition on food contact surfaces by application of postbiotics from Lactobacillus curvatus B.67 and Lactobacillus plantarum M.2. Food Res Int 2021; 148:110595. [PMID: 34507740 DOI: 10.1016/j.foodres.2021.110595] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 07/02/2021] [Accepted: 07/07/2021] [Indexed: 12/24/2022]
Abstract
Owing to their preservative and antimicrobial effects, postbiotics (metabolic byproducts of probiotics) are promising natural components for the food industry. Therefore, the present study aimed to investigate the efficacy of postbiotics collected from isolated Lactobacillus curvatus B.67 and Lactobacillus plantarum M.2 against Listeria monocytogenes pathogens in planktonic cells, motility, and biofilm states. The analysis of the metabolite composition of the postbiotics revealed various organic acids, along with a few well-known bacteriocin-encoding genes with potential antimicrobial effects. Postbiotics maintained their residual antimicrobial activity over the pH range 1-6 but lost all activity at neutral pH (pH 7). Full antimicrobial activity (100%) was observed during heat treatment, even under the autoclaving condition.Minimum inhibitory concentration (MICs) of L. curvatus B.67 and L. plantarum M.2 against L. monocytogenes were 80 and 70 mg/mL, respectively. However, four sub-MICs of the postbiotics (1/2, 1/4, 1/8, and 1/16 MIC) were tested for inhibition efficacy against L. monocytogenes during different experiment in this study. Swimming motility, biofilm formation, and expression levels of target genes related to biofilm formation, virulence, and quorum-sensing were significantly inhibited with increasing postbiotics concentration. Postbiotics from L. plantarum M.2 exhibited a higher inhibitory effect than the postbiotics from L. curvatus B.67. Nonetheless, both these postbiotics from Lactobacillus spp. could be used as effective bio-interventions for controlling L. monocytogenes biofilm in the food industry.
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Affiliation(s)
- Md Iqbal Hossain
- Department of Food Science and Technology, Advanced Food Safety Research Group, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Anseong, Gyunggido 456-756, Republic of Korea
| | - Md Furkanur Rahaman Mizan
- Department of Food Science and Technology, Advanced Food Safety Research Group, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Anseong, Gyunggido 456-756, Republic of Korea
| | - Pantu Kumar Roy
- Department of Food Science and Technology, Advanced Food Safety Research Group, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Anseong, Gyunggido 456-756, Republic of Korea
| | - Shamsun Nahar
- Department of Food Science and Technology, Advanced Food Safety Research Group, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Anseong, Gyunggido 456-756, Republic of Korea
| | - Sazzad Hossen Toushik
- Department of Food Science and Technology, Advanced Food Safety Research Group, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Anseong, Gyunggido 456-756, Republic of Korea
| | - Md Ashrafudoulla
- Department of Food Science and Technology, Advanced Food Safety Research Group, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Anseong, Gyunggido 456-756, Republic of Korea
| | - Iqbal Kabir Jahid
- Department of Microbiology, Jashore University of Science and Technology, Bangladesh
| | - Jihyun Lee
- Department of Food Science and Technology, Chung-Ang University, Anseong 17546, Republic of Korea
| | - Sang-Do Ha
- Department of Food Science and Technology, Advanced Food Safety Research Group, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Anseong, Gyunggido 456-756, Republic of Korea.
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15
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Maclura tinctoria Extracts: In Vitro Antibacterial Activity against Aeromonas hydrophila and Sedative Effect in Rhamdia quelen. FISHES 2021. [DOI: 10.3390/fishes6030025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Maclura tinctoria is a tree species native from Brazil and rich in phenolic compounds. Since plant antibacterial activity is highly associated with phenolic compound concentration, we aim to evaluate the in vitro antimicrobial activity of different extracts against fish pathogenic bacteria. In addition, some phenolic compounds have central depressant effects and can be useful in aquaculture due to possible sedative and/or anesthetic effects. Four M. tinctoria extracts were extracted separately with ethanol; leaves (LE), bark (BE), heartwood (HE), and the sapwood (SE). In vitro antimicrobial activity was tested against Aeromonas strains at concentrations of 6400 to 3.125 μg/mL. The sedative effect was evaluated for 24 h with 30 and 100 mg/L concentrations. Chemical composition was analyzed by HPLC-DAD-MS. The HE extract had the best MIC (400 µg/mL) and MBC (800 µg/mL) compared to the LE, BE, and SE extracts. LE extract induced deep sedation and the BE, SE, and HE extracts induced light sedation. Additionally, BE, SE, and HE induced a normal behavior without side effects. Polyphenolic compounds with antimicrobial activity and sedative effects were identified mainly in HE. Thus, HE extract is safe and can be used as a sedative for silver catfish.
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16
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Roy PK, Ha AJW, Mizan MFR, Hossain MI, Ashrafudoulla M, Toushik SH, Nahar S, Kim YK, Ha SD. Effects of environmental conditions (temperature, pH, and glucose) on biofilm formation of Salmonella enterica serotype Kentucky and virulence gene expression. Poult Sci 2021; 100:101209. [PMID: 34089933 PMCID: PMC8182266 DOI: 10.1016/j.psj.2021.101209] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 04/01/2021] [Accepted: 04/11/2021] [Indexed: 12/20/2022] Open
Abstract
Salmonella is a foodborne pathogen and an emerging zoonotic bacterial threat in the food industry. The aim of this study was to evaluate the biofilm formation by a cocktail culture of 3 wild isolates of Salmonella enterica serotype Kentucky on plastic (PLA), silicon rubber (SR), and chicken skin surfaces under various temperatures (4, 10, 25, 37, and 42°C) and pH values (4.0, 5.0, 6.0, 7.0, and 8.0). Then, at the optimum temperature and pH, the effects of supplementation with glucose (0, 0.025, 0.05, and 0.4% w/v) on biofilm formation were assessed on each of the surfaces. The results indicated that higher temperatures (25 to 42°C) and pH values (7.0 and 8.0) led to more robust biofilm formation than lower temperatures (4 and 10°C) and lower pH levels (4.0 to 6.0). Moreover, biofilm formation was induced by 0.025% glucose during incubation at the optimum temperature (37°C) and pH (7.0) but inhibited by 0.4% glucose. Consistent with this finding, virulence related gene (rpoS, rpoH, hilA, and avrA) expression was increased at 0.025% glucose and significantly reduced at 0.4% glucose. This results also confirmed by field emission scanning electron microscope, confocal laser scanning microscopy, and autoinducer-2 determination. This study concluded that optimum environmental conditions (temperature 37°C, pH 7.0, and 0.25% glucose) exhibited strong biofilm formation on food and food contract surfaces as well as increased the virulence gene expression levels, indicating that these environmental conditions might be threating conditions for food safety.
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Affiliation(s)
- Pantu Kumar Roy
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Angela Ji-Won Ha
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Md Furkanur Rahaman Mizan
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Md Iqbal Hossain
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Md Ashrafudoulla
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Sazzad Hossen Toushik
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Shamsun Nahar
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Yu Kyung Kim
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Sang-Do Ha
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do 456-756, Republic of Korea.
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17
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Lee JE, Lee NK, Paik HD. Antimicrobial and anti-biofilm effects of probiotic Lactobacillus plantarum KU200656 isolated from kimchi. Food Sci Biotechnol 2021; 30:97-106. [PMID: 33552621 DOI: 10.1007/s10068-020-00837-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/14/2020] [Accepted: 10/12/2020] [Indexed: 12/22/2022] Open
Abstract
The probiotic properties and anti-pathogenic effects of Lactobacillus plantarum KU200656 (KU200656) isolated from Korean fermented kimchi against Staphylococcus aureus, Listeria monocytogenes, Escherichia coli, and Salmonella Typhimurium were investigated. KU200656 showed high tolerance to artificial gastric acid (99.48%) and bile salts (102.40%) and this strain was safe according to antibiotic sensitivity test; it could not produce harmful enzymes, including β-glucuronidase. KU200656 exhibited high adhesion (4.45%) to intestinal cells, HT-29 cells, with high cell surface hydrophobicity (87.31% for xylene and 81.11% for toluene). Moreover, KU200656 co-aggregated with pathogenic bacteria and exhibited antibacterial activity and anti-adhesion properties against pathogens. The cell-free supernatant (CFS) of KU200656 inhibited biofilm formation by pathogenic bacteria. In addition, half of the minimum inhibitory concentration of the KU200656 CFS downregulated the expression of biofilm-related genes, as determined by quantitative real-time PCR. Therefore, KU200656 was demonstrated to possess anti-pathogenic effects and have potential for use as probiotics in the food industry.
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Affiliation(s)
- Ji-Eun Lee
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul, 05029 Republic of Korea
| | - Na-Kyoung Lee
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul, 05029 Republic of Korea
| | - Hyun-Dong Paik
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul, 05029 Republic of Korea
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18
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Expansion of Necrosis Depending on Hybrid Motor-Driven Motility of Aeromonas hydrophila in a Murine Wound Infection Model. Microorganisms 2020; 9:microorganisms9010010. [PMID: 33375129 PMCID: PMC7822177 DOI: 10.3390/microorganisms9010010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/17/2020] [Accepted: 12/18/2020] [Indexed: 12/04/2022] Open
Abstract
The gram-negative bacterium Aeromonas hydrophila is a cause of fulminant and lethal necrotizing soft tissue infections (NSTIs). Suppressing the rapid proliferation of the pathogen and expansion of the necrosis caused in the host is an important issue in clinical practice, but the pathogenic mechanism for the rapid aggravation has not been clarified. In this study, we characterized the function of two types of motor stators in A. hydrophila and explored the role of motility during wound infection. In vitro analysis showed that the motility was reliably maintained while being complemented by the stators. We created a non-motile strain that lacked genes encoding two types of motor stators and analyzed the role of motility in a murine wound infection model. Examination of the bacterial burden in the local infection site and systemic circulation revealed that motility was not essential for the proliferation of A. hydrophila in the host. However, the extent of necrosis at the lesions was lower, and survival times were prolonged in mice infected with the non-motile strain compared with mice infected with the parent strain. These results provide evidence that the rapid expansion of necrosis and the progression to death within a short time period is dependent on the motility of A. hydrophila.
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19
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Efficacy of flavourzyme against Salmonella Typhimurium, Escherichia coli, and Pseudomonas aeruginosa biofilms on food-contact surfaces. Int J Food Microbiol 2020; 336:108897. [PMID: 33091755 DOI: 10.1016/j.ijfoodmicro.2020.108897] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 07/30/2020] [Accepted: 09/14/2020] [Indexed: 12/21/2022]
Abstract
Food contamination is a major public health concern, with Salmonella Typhimurium, Escherichia coli, and Pseudomonas aeruginosa being the prominent causal agents. They often produce resistant shields in food through biofilm formation and are difficult to remove from food-contact surfaces using conventional cleaning agents. In the current study, we investigated the efficacy of flavourzyme, an industrial peptidase, in biofilm removal from ultra-high molecular weight polyethylene (UHMWPE) and rubber surfaces and compared the corresponding efficacies with those of the commonly used DNase I. We noticed a significant reduction of young (24-h-old) and mature (72-h-old) biofilms on both surfaces after treatment with flavourzyme. The overall reduction potentiality of flavourzyme was higher than that of DNase I. The flavourzyme-mediated removal of biofilms appears to be caused by the gradual disruption of amide (NH) and polysaccharide (C-O-C) stretching bands of the extracellular polymeric substances (EPS) released by the microbes. EPS elimination and the cell-friendly behavior of flavourzyme were further confirmed by field emission scanning electron microscopy. Based on these findings, we suggest that flavourzyme can reduce microbial EPS formation, thus possibly controlling microbial food contamination. This finding reveals a new opportunity for the development of a novel method for controlling foodborne illness as well as food spoilage.
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20
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Dong W, Cai Y, Xu Z, Fu B, Chen Q, Cui Y, Ruan Z, Liang Y, Peng N, Zhao S. Heterologous expression of AHL lactonase AiiK by Lactobacillus casei MCJΔ1 with great quorum quenching ability against Aeromonas hydrophila AH-1 and AH-4. Microb Cell Fact 2020; 19:191. [PMID: 33028330 PMCID: PMC7542731 DOI: 10.1186/s12934-020-01448-4] [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: 11/21/2019] [Accepted: 09/25/2020] [Indexed: 11/20/2022] Open
Abstract
Background Nowadays, microbial infections have caused increasing economic losses in aquaculture industry and deteriorated worldwide environments. Many of these infections are caused by opportunistic pathogens through cell-density mediated quorum sensing (QS). The disruption of QS, known as quorum quenching (QQ), is an effective and promising way to prevent and control pathogens, driving it be the potential bio-control agents. In our previous studies, AHL lactonase AiiK was identified with many characteristics, and constitutive expression vector pELX1 was constructed to express heterologous proteins in Lactobacillus casei MCJΔ1 (L. casei MCJΔ1). In this study, recombinant strain pELCW-aiiK/L. casei MCJΔ1 (LcAiiK) and wild-type Aeromonas hydrophila (A. hydrophila) were co-cultured to test the QQ ability of LcAiiK against A. hydrophila. Results A cell wall-associated expression vector pELCW for L. casei MCJΔ1 was constructed. Localization assays revealed that the expressed AiiK was anchored at the surface layer of LcAiiK via vector pELCW-aiiK. LcAiiK (OD600 = 0.5) degraded 24.13 μM of C6-HSL at 2 h, 40.99 μM of C6-HSL at 12 h, and 46.63 μM of C6-HSL at 24 h. Over 50% LcAiiK cells maintained the pELCW-aiiK plasmid after 15 generations of cultivation without erythromycin. Furthermore, LcAiiK inhibited the swimming motility, extracellular proteolytic activity, haemolytic activity and biofilm formation of A. hydrophila AH-1 and AH-4. Conclusion The AHL lactonase AiiK is firstly and constitutively expressed at the surface layer of L. casei MCJΔ1. LcAiiK displayed considerable AHL lactonase activity and great QQ abilities against A. hydrophila AH-1 and AH-4 by attenuating their QS processes instead of killing them. Therefore, the LcAiiK can be exploited as an anti-pathogenic drug or a bio-control agent to control the AHL-mediated QS of pathogenic bacteria.
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Affiliation(s)
- Weiwei Dong
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yuyuan Cai
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhilong Xu
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Biao Fu
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Qitong Chen
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yuxin Cui
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhiyong Ruan
- Institute of Agricultural Resources and Regional Planning, CAAS, Beijing, 100081, China
| | - Yunxiang Liang
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Nan Peng
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Shumiao Zhao
- State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China.
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21
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Cui Z, Li Z, Jin Y, Ren T, Chen J, Wang X, Zhong K, Tang L, Tang Y, Cao M. Novel magnetic fluorescence probe based on carbon quantum dots-doped molecularly imprinted polymer for AHLs signaling molecules sensing in fish juice and milk. Food Chem 2020; 328:127063. [DOI: 10.1016/j.foodchem.2020.127063] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 05/09/2020] [Accepted: 05/13/2020] [Indexed: 12/20/2022]
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22
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Ndraha N, Wong HC, Hsiao HI. Managing the risk of Vibrio parahaemolyticus infections associated with oyster consumption: A review. Compr Rev Food Sci Food Saf 2020; 19:1187-1217. [PMID: 33331689 DOI: 10.1111/1541-4337.12557] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 02/15/2020] [Accepted: 03/02/2020] [Indexed: 12/15/2022]
Abstract
Vibrio parahaemolyticus is a Gram-negative bacterium that is naturally present in the marine environment. Oysters, which are water filter feeders, may accumulate this pathogen in their soft tissues, thus increasing the risk of V. parahaemolyticus infection among people who consume oysters. In this review, factors affecting V. parahaemolyticus accumulation in oysters, the route of the pathogen from primary production to consumption, and the potential effects of climate change were discussed. In addition, intervention strategies for reducing accumulation of V. parahaemolyticus in oysters were presented. A literature review revealed the following information relevant to the present study: (a) managing the safety of oysters (for human consumption) from primary production to consumption remains a challenge, (b) there are multiple factors that influence the concentration of V. parahaemolyticus in oysters from primary production to consumption, (c) climate change could possibly affect the safety of oysters, both directly and indirectly, placing public health at risk, (d) many intervention strategies have been developed to control and/or reduce the concentration of V. parahaemolyticus in oysters to acceptable levels, but most of them are mainly focused on the downstream steps of the oyster supply chain, and (c) although available regulation and/or guidelines governing the safety of oyster consumption are mostly available in developed countries, limited food safety information is available in developing countries. The information provided in this review may serve as an early warning for managing the future effects of climate change on the safety of oyster consumption.
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Affiliation(s)
- Nodali Ndraha
- Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan (R.O.C.)
| | - Hin-Chung Wong
- Department of Microbiology, Soochow University, Taipei, Taiwan (R.O.C.)
| | - Hsin-I Hsiao
- Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan (R.O.C.).,Institute of Food Safety and Risk Management, National Taiwan Ocean University, Keelung, Taiwan (R.O.C.)
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23
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Alves RBT, Mousavi Khaneghah A, Antunes MA, Silva BS, Sant'Ana AS, Peña WEL, Andrade NJ. Inactivation modeling of microorganisms using organic chlorine and acetic acid solutions and estimation of growth kinetics of adhered Enterobacteriaceae to lettuce (
Lactuca sativa
L.). J Food Saf 2020. [DOI: 10.1111/jfs.12790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Roberta B. T. Alves
- Department of Food TechnologyFederal University of Viçosa Viçosa Minas Gerais Brazil
| | - Amin Mousavi Khaneghah
- Department of Food Science, Faculty of Food EngineeringUniversity of Campinas Campinas São Paulo Brazil
| | - Maria A. Antunes
- Department of Food TechnologyFederal University of Viçosa Viçosa Minas Gerais Brazil
| | - Beatriz S. Silva
- Department of Food Science, Faculty of Food EngineeringUniversity of Campinas Campinas São Paulo Brazil
| | - Anderson S. Sant'Ana
- Department of Food Science, Faculty of Food EngineeringUniversity of Campinas Campinas São Paulo Brazil
| | - Wilmer E. L. Peña
- Department of Food TechnologyFederal University of Viçosa Viçosa Minas Gerais Brazil
| | - Nélio J. Andrade
- Department of Food TechnologyFederal University of Viçosa Viçosa Minas Gerais Brazil
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24
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Jin L, Zhang X, Shi H, Wang W, Qiao Z, Yang W, Du W. Identification of a Novel N-Acyl Homoserine Lactone Synthase, AhyI, in Aeromonas hydrophila and Structural Basis for Its Substrate Specificity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:2516-2527. [PMID: 32050067 DOI: 10.1021/acs.jafc.9b07833] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In the Gram-negative bacterium Aeromonas hydrophila, N-acyl homoserine lactone (AHL)-mediated quorum sensing (QS) influences pathogenicity, protein secretion, and motility. However, the catalytic mechanism of AHL biosynthesis and the structural basis and substrate specificity for AhyI members remain unclear. In this study, we cloned the ahyI gene from the isolate A. hydrophila HX-3, and the overexpressed AhyI protein was confirmed to produce six types of AHLs by ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) analysis, contrasting with previous reports that AhyI only produces N-butanoyl-l-homoserine lactone (C4-HSL) and N-hexanoyl-l-homoserine lactone (C6-HSL). The results of an in vitro biosynthetic assay showed that purified AhyI can catalyze the formation of C4-HSL using S-adenosyl-l-methionine (SAM) and butyryl-acyl carrier protein (ACP) as substrates and indicated that the fatty acyl substrate used in AhyI-mediated AHL synthesis is derived from acyl-ACP rather than acyl-CoA. The kinetic data of AhyI using butyryl-ACP as an acyl substrate indicated that the catalytic efficiency of the A. hydrophila HX-3 AhyI enzyme is within an order of magnitude compared to other LuxI homologues. In this study, for the first time, the tertiary structural modeling results of AhyI and those of molecular docking and structural and functional analyses showed the importance of several crucial residues, as well as the secondary structure with respect to acylation. A Phe125-Phe152 clamp grasps the terminal methyl group to assist in stabilizing the long acyl chains in a putative binding pocket. The stacking interactions within a strong hydrophobic environment, a hydrogen-bonding network, and a β bulge presumably stabilize the ACP acyl chain for the attack of the SAM α-amine toward the thioester carbon, offering a relatively reasonable explanation for how AhyI can synthesize AHLs with diverse acyl-chain lengths. Moreover, Trp34 participates in forming the binding pocket for C4-ACP and becomes ordered upon SAM binding, providing a good basis for catalysis. The novel finding that AhyI can produce both short- and long-chain AHLs enhances current knowledge regarding the variety of AHLs produced by this enzyme. These structural data are expected to serve as a molecular rationale for AHL synthesis by AhyI.
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Affiliation(s)
- Lei Jin
- College of Food and Pharmaceutical Sciences , Ningbo University , Ningbo 315211 , P. R. China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province , Ningbo University , Ningbo 315211 , P. R. China
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
| | - Xiaojun Zhang
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
- Zhoushan Fishery Environments & Aquatic Products Quality Monitoring Center of Ministry of Agriculture China , Zhoushan 316021 , P. R. China
| | - Hui Shi
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
| | - Wei Wang
- Marine Fishery Research Institute of Zhejiang Province , Zhoushan 316021 , P. R. China
| | - Zhaohui Qiao
- College of Food and Pharmaceutical Sciences , Ningbo University , Ningbo 315211 , P. R. China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province , Ningbo University , Ningbo 315211 , P. R. China
| | - Wenge Yang
- College of Food and Pharmaceutical Sciences , Ningbo University , Ningbo 315211 , P. R. China
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province , Ningbo University , Ningbo 315211 , P. R. China
| | - Wenyi Du
- Sichuan MoDe Technology Co., Ltd. , Chengdu 610000 , P. R. China
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Wang J, Liu Q, Li X, Ma S, Hu H, Wu B, Zhang XX, Ren H. In-situ monitoring AHL-mediated quorum-sensing regulation of the initial phase of wastewater biofilm formation. ENVIRONMENT INTERNATIONAL 2020; 135:105326. [PMID: 31794939 DOI: 10.1016/j.envint.2019.105326] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Revised: 10/05/2019] [Accepted: 11/11/2019] [Indexed: 06/10/2023]
Abstract
Initial attachment plays an important role in biofilm formation in wastewater treatment processes. However, the initial attachment process mediated by N-acyl-homoserine lactones (AHLs) is difficult to be fully understood due to the lack of non-invasive and on-line investigation techniques. In this study, the AHL-regulated wastewater biofilm attachment was quantified using ultrasonic time-domain reflectometry (UTDR) as an in-situ and non-invasive monitoring technique. Results demonstrated that the reversible adhesion time in municipal and industrial wastewaters was significantly decreased in the presence of exogenous AHLs. Biofilm thickness in municipal and industrial wastewaters increased significantly with the addition of exogenous AHLs. Also, the addition of acylase delayed the initial biofilm formation (lengthened reversible adhesion time and decreased biofilm thickness and density). Compared with biofilm behavior in the presence of low concentrations of AHLs (4.92 ± 0.17 μg/L), both reversible adhesion time and biofilm thickness were not significantly increased (p > 0.05) with an increase in AHL concentration (9.75 ± 0.41 μg/L). Furthermore, the addition of exogenous AHLs resulted in significant changes in the attached bacterial community structures, in which both QS and quorum-quenching (QQ) bacteria were stimulated. The current work presents an effective approach to in-situ monitoring of the regulation of AHL-mediated QS in the initial attachment of biofilms, especially in the reversible adhesion process, which may provide a potential strategy to facilitate biofilm establishment in wastewater treatment processes.
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Affiliation(s)
- Jinfeng Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Qiuju Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Xianhui Li
- Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Sijia Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Haidong Hu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Bing Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Xu-Xiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China.
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John N, Vidyalakshmi VB, Hatha AAM. Effect of pH and Salinity on the Production of Extracellular Virulence Factors by Aeromonas from Food Sources. J Food Sci 2019; 84:2250-2255. [PMID: 31313323 DOI: 10.1111/1750-3841.14729] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 06/08/2019] [Accepted: 06/10/2019] [Indexed: 11/29/2022]
Abstract
The ability to produce various extracellular enzymes is considered as an important virulence feature in Aeromonas spp., in addition to producing specific virulence factors such as aerolysin and hemolysin. In this study, the effect of salinity and pH on the production of extracellular virulence factors by Aeromonas was investigated. Aeromonas was obtained from different food sources. A comparative study of the activities of extracellular enzymes secreted by these bacteria at different environmental conditions can widen our understanding on their pathogenicity. The activities of various extracellular enzymes such as amylase, gelatinase, and caseinase, which are implicated as virulence factors, were measured in vitro by calculating the enzymatic activity index (EAI) of each enzyme using standard laboratory protocols. For all enzymes, a significant change (P < 0.05) in the EAI was observed when the concentration of NaCl in the media increased from 0.5% to 3%. Among three enzymes tested, caseinase was found to be affected the most by salinity, with a significant difference in EAI when NaCl concentration in the media increased from 0.5% to 2%. Similarly, amylase was found to be affected the most by acidity. The pH values ranging from 6 to 9 did not exert any significant change in EAI of amylase; however, a pH value of 5 had a significant effect. Overall, compared to salinity, the change in pH was found to be less effective in controlling the extracellular virulence factor production in Aeromonas. PRACTICAL APPLICATIONS: The practical application is to minimize the extracellular virulence factor production by Aeromonas in food commodities by altering the salt content and pH. The results demonstrate that an increase in salinity and a decrease in pH can minimize the extracellular virulence factor production by Aeromonas spp.
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Affiliation(s)
- Nifty John
- Dept. of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Lakeside Campus, Cochin Univ. of Science and Technology, Cochin, 682 016, Kerala, India
| | - V B Vidyalakshmi
- Dept. of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Lakeside Campus, Cochin Univ. of Science and Technology, Cochin, 682 016, Kerala, India
| | - A A Mohamed Hatha
- Dept. of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Lakeside Campus, Cochin Univ. of Science and Technology, Cochin, 682 016, Kerala, India
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Ding T, Li T, Li J. Virtual screening for quorum-sensing inhibitors of Pseudomonas fluorescens P07 from a food-derived compound database. J Appl Microbiol 2019; 127:763-777. [PMID: 31125995 DOI: 10.1111/jam.14333] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/09/2019] [Accepted: 05/18/2019] [Indexed: 01/15/2023]
Abstract
AIMS Pseudomonas fluorescens are important psychrotrophic food spoilage bacteria that are frequently detected in dairy, meat and aquatic products. Quorum sensing (QS) is an intercellular communication and gene regulation mechanism that enables bacteria to monitor their cell densities and regulate a variety of physiological processes. Hence, targeting the bacterial QS system might be a feasible approach to improve food quality and safety by regulating the spoilage caused by P. fluorescens. METHODS AND RESULTS In this study, we screened a food-derived three-dimensional (3D) compound database to search for potential QS inhibitors (QSIs) with higher security. The 3D structures of LuxI- and LuxR-type proteins of P. fluorescens P07 were used as targets to screen for QSIs. A total of 25 compounds with high docking scores were tested for their anti-QS activities by indicator strains. The results show that 19 compounds possessed anti-QS activities. Among them, (+)-catechin had the strongest anti-QS activity. The results show that (+)-catechin significantly inhibited the production of extracellular enzymes, swimming motility, biofilm formation, acyl-homoserine lactones and extracellular polymeric substances (EPSs) of P. fluorescens P07. The inhibitory mechanism of (+)-catechin on the QS system of P. fluorescens P07 was discussed in the context of molecular docking analysis and real-time quantitative PCR (RT-qPCR). CONCLUSIONS Virtual screening was useful in finding novel QSIs with high security of P. fluorescens P07 from a food-derived 3D compound database. The high hit rate suggested that foods are rich sources of QSIs, and have great potential for exploration. SIGNIFICANCE AND IMPACT OF THE STUDY The modelled LuxI- and LuxR-type proteins could be used as targets to discover P. fluorescens P07 QSIs. (+)-catechin, (-)-epicatechin, propyl gallate, hesperidin and lycopene which were identified as potent QSIs, and may be applied in food preservation and biofilm elimination.
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Affiliation(s)
- T Ding
- School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - T Li
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, Dalian, Liaoning, China
| | - J Li
- School of Food Science and Technology, Jiangnan University, Wuxi, China.,College of Food Science and Technology, Bohai University, Jinzhou,, Liaoning, China.,Food Safety Key Lab of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning, China
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28
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Zhu YL, Hou HM, Zhang GL, Wang YF, Hao HS. AHLs Regulate Biofilm Formation and Swimming Motility of Hafnia alvei H4. Front Microbiol 2019; 10:1330. [PMID: 31275267 PMCID: PMC6593095 DOI: 10.3389/fmicb.2019.01330] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 05/28/2019] [Indexed: 12/17/2022] Open
Abstract
The aim of this study was to evaluate the role of N-acyl homoserine lactones (AHLs) in the regulation of swimming motility of Hafnia alvei H4 and its biofilm formation on 96-well plate, glass and stainless-steel surfaces. The luxI gene, which codes for an enzyme involved in AHL synthesis, was deleted to generate a luxI mutant (ΔluxI). The mutant produced no AHL, and the relative expression of the luxR gene was significantly (P < 0.05) decreased. In addition, qRT-PCR analysis showed that the relative expression of the luxR gene in ΔluxI was stimulated by the presence of exogenous AHLs (C4-HSL, C6-HSL, and 3-o-C8-HSL) added at concentrations ranging from of 50–250 μg/ml. Among the three AHLs, C6-HSL had the strongest effect. The ability of ΔluxI to form biofilm on 96-well plate, glass and stainless-steel surfaces was significantly reduced (P < 0.05) compared with the wild type (WT), but was increased when provided with 150 μg/ml C4-HSL, whereas C6-HSL and 3-o-C8-HSL had no effect. Scanning electron microscopy analysis of the biofilm revealed less bacteria adhering to the surface of stainless-steel and fewer filaments were found binding to the cells compared with the WT. Furthermore, ΔluxI also exhibited significant (P < 0.05) decrease in the expression of biofilm- and swimming motility-related genes, flgA, motA and cheA, consistent with the results observed for biofilm formation and swimming motility. Taken together, the results suggested that in H. alvei H4, C4-HSL may act as an important molecular signal through regulating the ability of the cells to form biofilm, as well as through regulating the swimming motility of the cell, and this could provide a new way to control these phenotypes of H. alvei in food processing.
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Affiliation(s)
- Yao lei Zhu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- Liaoning Key Lab for Aquatic Processing Quality and Safety, Dalian, China
| | - Hong man Hou
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- Liaoning Key Lab for Aquatic Processing Quality and Safety, Dalian, China
- *Correspondence: Hong man Hou,
| | - Gong liang Zhang
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- Liaoning Key Lab for Aquatic Processing Quality and Safety, Dalian, China
| | - Yi fang Wang
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- Liaoning Key Lab for Aquatic Processing Quality and Safety, Dalian, China
| | - Hong shun Hao
- Liaoning Key Lab for Aquatic Processing Quality and Safety, Dalian, China
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29
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Haque S, Yadav DK, Bisht SC, Yadav N, Singh V, Dubey KK, Jawed A, Wahid M, Dar SA. Quorum sensing pathways in Gram-positive and -negative bacteria: potential of their interruption in abating drug resistance. J Chemother 2019; 31:161-187. [DOI: 10.1080/1120009x.2019.1599175] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Shafiul Haque
- Research and Scientific Studies Unit, College of Nursing and Allied Health Sciences, Jazan University, Jazan, Saudi Arabia
- Gene Expression Laboratory, Department of Biosciences, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi, India
| | - Dinesh K. Yadav
- Department of Botany, University of Allahabad, Allahabad, Uttar Pradesh, India
| | - Shekhar C. Bisht
- Department of Biotechnology, H.N.B Garhwal University, Srinagar, Uttarakhand, India
| | - Neelam Yadav
- Department of Botany, University of Allahabad, Allahabad, Uttar Pradesh, India
| | - Vineeta Singh
- Microbiology Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India
| | - Kashyap Kumar Dubey
- Industrial Biotechnology Laboratory, University Institute of Engineering and Technology, M.D. University, Rohtak, Haryana, India
| | - Arshad Jawed
- Research and Scientific Studies Unit, College of Nursing and Allied Health Sciences, Jazan University, Jazan, Saudi Arabia
| | - Mohd Wahid
- Research and Scientific Studies Unit, College of Nursing and Allied Health Sciences, Jazan University, Jazan, Saudi Arabia
| | - Sajad Ahmad Dar
- Research and Scientific Studies Unit, College of Nursing and Allied Health Sciences, Jazan University, Jazan, Saudi Arabia
- Departments of Microbiology, University College of Medical Sciences (University of Delhi), Delhi, India
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30
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Huang H, Peng C, Peng P, Lin Y, Zhang X, Ren H. Towards the biofilm characterization and regulation in biological wastewater treatment. Appl Microbiol Biotechnol 2018; 103:1115-1129. [DOI: 10.1007/s00253-018-9511-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 11/07/2018] [Indexed: 12/24/2022]
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31
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Freire NB, Magalhães TC, Nunes Soares RA, da Costa MM, Gouveia GV. Nutritional interference for phenotypic biofilm quantification in Aeromonas spp. isolates containing the fla gene. Microb Pathog 2018; 127:198-201. [PMID: 30500410 DOI: 10.1016/j.micpath.2018.11.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 10/31/2018] [Accepted: 11/26/2018] [Indexed: 10/27/2022]
Abstract
The Aeromonas genus has several virulence factors associated with the development of diseases in aquatic organisms, leading to losses in aquaculture. One of these factors is the flagella's formation which allows the biofilm's formation that provides the microorganisms a greater pathogenicity, greater protection to certain substances such as antibiotics. The aim of the study was to verify the presence of the fla gene, related to biofilm production in isolates of Aeromonas spp. from fishes and also to determine the best quantification condition of phenotypic biofilm production in vitro. Polymerase Chain Reactions were performed to obtain the amplification of the region comprising the fla gene. To determine the best condition for the production biofilm, the microplate adhesion test was carried out under different concentrations of TSB broth and it combined with glucose. Of the 43 isolates of Aeromonas spp. analyzed, 28 were positive for the fla gene and, in the quantification of the biofilm, all these were able to form biofilm in the TSB broth without dilution and without addition of glucose, being this the best condition tested. It was observed that the isolates of Aeromonas spp. analyzed have potential for biofilm formation, and hence potential for virulence.
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Affiliation(s)
- Naiana Braga Freire
- Natural Resources of Semiarid Department, UNIVASF - Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil.
| | - Thaís Correia Magalhães
- Genetics and Molecular Biology Department, UESC - Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil
| | - Riani Ananda Nunes Soares
- Biological Sciences Department, UNIVASF - Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil
| | - Mateus Matiuzzi da Costa
- Animal Science Department, UNIVASF - Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil
| | - Gisele Veneroni Gouveia
- Animal Science Department, UNIVASF - Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil
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Jahid IK, Mizan MFR, Myoung J, Ha SD. Aeromonas hydrophila biofilm, exoprotease, and quorum sensing responses to co-cultivation with diverse foodborne pathogens and food spoilage bacteria on crab surfaces. BIOFOULING 2018; 34:1079-1092. [PMID: 30698028 DOI: 10.1080/08927014.2018.1519069] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 08/21/2018] [Accepted: 08/24/2018] [Indexed: 06/09/2023]
Abstract
The effects of dual species interactions on biofilm formation by Aeromonas hydrophila in the presence of Pseudomonas aeruginosa, Pseudomonas fluorescens, Pectobacterium carotovorum, Salmonella Typhimurium, and Listeria monocytogenes were examined. High-performance liquid chromatography and liquid-chromatography-mass spectrometry were performed to identify N-acyl homoserine lactone (AHL) molecules secreted by monocultures and dual cultures grown in crab broth. Field emission scanning electron microscopy was performed to observe attachment and biofilm formation. P. aeruginosa and P. fluorescens inhibited biofilm formation by A. hydrophila on the crab surface, without affecting their own biofilm-forming abilities. Dual biofilms of S. Typhimurium, L. monocytogenes, or P. carotovorum did not affect A. hydrophila biofilm formation. Exoprotease, AHL, and AI-2 levels were significantly reduced in dual cultures of P. aeruginosa and P. fluorescens with A. hydrophila, supporting the relationship between quorum sensing and biofilm formation. Dual-species biofilms were studied in their natural environment and in the laboratory.
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Affiliation(s)
- Iqbal Kabir Jahid
- a School of Food Science and Technology , Chung-Ang University , Daedeok-Myun , Anseong , Gyunggido , South Korea
- b Department of Microbiology , Jessore University of Science and Technology , Bangladesh
| | - Md Furkanur Rahaman Mizan
- a School of Food Science and Technology , Chung-Ang University , Daedeok-Myun , Anseong , Gyunggido , South Korea
| | - Jinjong Myoung
- c Korea Zoonosis Research Institute, Chonbuk National University , Deokjin-dong 1ga, Deokjin-gu , Jeonju-si , Jeollabuk-do , South Korea
| | - Sang-Do Ha
- a School of Food Science and Technology , Chung-Ang University , Daedeok-Myun , Anseong , Gyunggido , South Korea
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Martins ML, Pinto UM, Riedel K, Vanetti MCD. Quorum Sensing and Spoilage Potential of Psychrotrophic Enterobacteriaceae Isolated from Milk. BIOMED RESEARCH INTERNATIONAL 2018; 2018:2723157. [PMID: 30426005 PMCID: PMC6217898 DOI: 10.1155/2018/2723157] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 09/25/2018] [Accepted: 10/02/2018] [Indexed: 12/03/2022]
Abstract
The 16S rDNA of six psychrotrophic Enterobacteriaceae isolated from cold raw milk were sequenced and the isolate 039 was identified as Pantoea sp., isolates 059, 068, and 071 were identified as Hafnia alvei, 067 was identified as Enterobacter sp., and 099 was identified as Aeromonas hydrophila. They presented different spoilage potentials in milk with A. hydrophila 099 being the most deteriorative. Only Pantoea sp. 039 was not able to induce the quorum sensing monitor strains of acyl homoserine lactones (AHLs). The halI gene, which encodes the AHL synthase in H. alvei, was identified in the isolates 059, 067, 068, and 071. After initial sequencing characterization and cloning, this gene showed its function by the heterologous synthesis of N-hexanoyl-DL-homoserine lactone and N-3-oxohexanoyl-L-homoserine lactone in Escherichia coli. In addition to producing AHLs, A. hydrophila 099 produced AI-2 in higher level than the assay's positive control Vibrio harveyi BB120. Therefore, Enterobacteriaceae strains isolated from cooled raw milk produce a rich array of signaling molecules that may influence bacterial traits in the milk environment.
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Affiliation(s)
- Maurilio Lopes Martins
- Department of Food Science and Technology, Federal Institute of Southeast of Minas Gerais, 36180-000 Rio Pomba, MG, Brazil
| | - Uelinton Manoel Pinto
- Food Research Center, Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, 05508-000 São Paulo, SP, Brazil
| | - Katharina Riedel
- Institute of Microbiology, Ernst-Moritz-Arndt University of Greifswald, 17489, Germany
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Ali F, Yao Z, Li W, Sun L, Lin W, Lin X. In-Silico Prediction and Modeling of the Quorum Sensing LuxS Protein and Inhibition of AI-2 Biosynthesis in Aeromonas hydrophila. Molecules 2018; 23:E2627. [PMID: 30322111 PMCID: PMC6222731 DOI: 10.3390/molecules23102627] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/10/2018] [Accepted: 10/10/2018] [Indexed: 02/07/2023] Open
Abstract
luxS is conserved in several bacterial species, including A. hydrophila, which causes infections in prawn, fish, and shrimp, and is consequently a great risk to the aquaculture industry and public health. luxS plays a critical role in the biosynthesis of the autoinducer-2 (AI-2), which performs wide-ranging functions in bacterial communication, and especially in quorum sensing (QS). The prediction of a 3D structure of the QS-associated LuxS protein is thus essential to better understand and control A. hydrophila pathogenecity. Here, we predicted the structure of A. hydrophila LuxS and characterized it structurally and functionally with in silico methods. The predicted structure of LuxS provides a framework to develop more complete structural and functional insights and will aid the mitigation of A. hydrophila infection, and the development of novel drugs to control infections. In addition to modeling, the suitable inhibitor was identified by high through put screening (HTS) against drug like subset of ZINC database and inhibitor ((-)-Dimethyl 2,3-O-isopropylidene-l-tartrate) molecule was selected based on the best drug score. Molecular docking studies were performed to find out the best binding affinity between LuxS homologous or predicted model of LuxS protein for the ligand selection. Remarkably, this inhibitor molecule establishes agreeable interfaces with amino acid residues LYS 23, VAL 35, ILE76, and SER 90, which are found to play an essential role in inhibition mechanism. These predictions were suggesting that the proposed inhibitor molecule may be considered as drug candidates against AI-2 biosynthesis of A. hydrophila. Therefore, (-)-Dimethyl 2,3-O-isopropylidene-l-tartrate inhibitor molecule was studied to confirm its potency of AI-2 biosynthesis inhibition. The results shows that the inhibitor molecule had a better efficacy in AI-2 inhibition at 40 μM concentration, which was further validated using Western blotting at a protein expression level. The AI-2 bioluminescence assay showed that the decreased amount of AI-2 biosynthesis and downregulation of LuxS protein play an important role in the AI-2 inhibition. Lastly, these experiments were conducted with the supplementation of antibiotics via cocktail therapy of AI-2 inhibitor plus OXY antibiotics, in order to determine the possibility of novel cocktail drug treatments of A. hydrophila infection.
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Affiliation(s)
- Farman Ali
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
- Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University, Fuzhou 35002, China.
| | - Zujie Yao
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
- Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University, Fuzhou 35002, China.
| | - Wanxin Li
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
- Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University, Fuzhou 35002, China.
| | - Lina Sun
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
- Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University, Fuzhou 35002, China.
| | - Wenxiong Lin
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
- Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University, Fuzhou 35002, China.
| | - Xiangmin Lin
- Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
- Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University) Fujian Province University, Fuzhou 35002, China.
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Jarząb N, Walczak M, Smoliński D, Sionkowska A. The impact of medicinal brines on microbial biofilm formation on inhalation equipment surfaces. BIOFOULING 2018; 34:963-975. [PMID: 30614293 DOI: 10.1080/08927014.2018.1515353] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Revised: 08/07/2018] [Accepted: 08/15/2018] [Indexed: 06/09/2023]
Abstract
Materials such as polyvinyl chloride, polypropylene, and polyethylene are used for the construction of medical equipment, including inhalation equipment. Inhalation equipment, because of the wet conditions and good oxygenation, constitutes a perfect environment for microbial biofilm formation. Biofilms may affect microbiological cleanliness of inhalation facilities and installations and promote the development of pathogenic bacteria. Microbial biofilms can form even in saline environments. Therefore, the aim of this study was to evaluate the effect of medicinal brines on microbial biofilm formation on the surfaces of inhalation equipment. The study confirmed the high risk of biofilm formation on surfaces used in inhalation equipment. Isolated microorganisms belonged to potential pathogens of the respiratory system, which can pose a health threat to hospital patients. The introduction of additional contaminants increased the amount of bacterial biofilm. On the other hand, the presence of brines significantly limited the amount of biofilm, thus eliminating the risk of infections.
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Affiliation(s)
- Natalia Jarząb
- a Department of Environmental Microbiology and Biotechnology, Faculty of Biology and Environmental Protection , Nicolaus Copernicus University , Toruń , Poland
| | - Maciej Walczak
- a Department of Environmental Microbiology and Biotechnology, Faculty of Biology and Environmental Protection , Nicolaus Copernicus University , Toruń , Poland
| | - Dariusz Smoliński
- b Department of Cell Biology, Faculty of Biology and Environmental Protection , Nicolaus Copernicus University , Toruń , Poland
| | - Alina Sionkowska
- c Department of Chemistry of Biomaterials and Cosmetics, Faculty of Chemistry , Nicolaus Copernicus University , Toruń , Poland
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Pires IC, Freire NB, Fernandes AW, Souza RF, Silva Jr FA, Oliveira HP, Costa MM. Influência do polipirrol e dos níveis de salinidade na formação de biofilme em Aeromonas spp. PESQUISA VETERINARIA BRASILEIRA 2018. [DOI: 10.1590/1678-5150-pvb-5374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
RESUMO: Bactérias do gênero Aeromonas são patógenos altamente disseminados no ambiente aquático, responsáveis por grandes perdas econômicas na piscicultura de diversos países. São micro-organismos oportunistas e sua patogenicidade está ligada a alguns fatores de virulência, como a formação de biofilme. O estresse salino é um dos fatores que favorecem a formação dessas colônias e, consequentemente, o aumento de infecções. Essas infecções quando estão associadas ao biofilme são ainda mais resistentes aos antimicrobianos. Nesse contexto, o polipirrol destaca-se como uma alternativa antimicrobiana por possuir vários atributos terapêuticos e não apresentar toxicidade aos organismos. Dessa forma, o objetivo desse estudo foi avaliar o perfil de susceptibilidade e a capacidade de formação de biofilme dos isolados de Aeromonas spp. associados aos diferentes níveis de salinidade e polipirrol. Determinou-se a atividade antibacteriana dos isolados e ensaios de motilidade foram realizados com bactérias que carreavam o gene fla. Também verificou-se a capacidade do cloreto de sódio e polipirrol em interferir na formação do biofilme. Os resultados foram evidenciados com a microscopia eletrônica de varredura. As concentrações de 2 e 3% de NaCl inibiram a motilidade bacteriana. Na formação do biofilme, 83% dos isolados bacterianos induziram a produção na concentração de 0,25%. O polipirrol causou a morte de todos os isolados testados na concentração de 125μg/mL. Além disso, esse composto diminuiu a motilidade bacteriana nas concentrações de 0,25 a 3%, sendo que em relação à produção de biofilme, não houve interferência. Esses resultados evidenciam que os diferentes níveis de NaCl influenciam na formação do biofilme favorecendo a persistência da infecção. Este estudo também realçou a potencialidade do polipirrol como agente bactericida, sendo uma alternativa eficaz às drogas antimicrobianas para o tratamento das infecções causadas por Aeromonas spp.
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Lamas A, Regal P, Vázquez B, Miranda JM, Cepeda A, Franco CM. Salmonella and Campylobacter biofilm formation: a comparative assessment from farm to fork. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2018; 98:4014-4032. [PMID: 29424050 DOI: 10.1002/jsfa.8945] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 01/16/2018] [Accepted: 02/02/2018] [Indexed: 06/08/2023]
Abstract
It takes several steps to bring food from the farm to the fork (dining table), and contamination with food-borne pathogens can occur at any point in the process. Campylobacter spp. and Salmonella spp. are the main microorganisms responsible for foodborne disease in the EU. These two pathogens are able to persist throughout the food supply chain thanks to their ability to form biofilms. Owing to the high prevalence of Salmonella and especially of Campylobacter in the food supply chain and the huge efforts of food authorities to reduce these levels, it is of great importance to fully understand their mechanisms of persistence. Diverse studies have evaluated the biofilm-forming capacity of foodborne pathogens isolated at different steps of food production. Nonetheless, the principal obstacle of these studies is to reproduce the real conditions that microorganisms encounter in the food supply chain. While there are a wide number of Salmonella biofilm studies, information on Campylobacter biofilms is still limited. A comparison between the two microorganisms could help to develop new research in the field of Campylobacter biofilms. Therefore, this review evaluates relevant work in the field of Salmonella and Campylobacter biofilms and the applicability of the data obtained from these studies to real working conditions. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Alexandre Lamas
- Laboratorio de Higiene Inspección y Control de Alimentos, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago de Compostela, Lugo, Spain
| | - Patricia Regal
- Laboratorio de Higiene Inspección y Control de Alimentos, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago de Compostela, Lugo, Spain
| | - Beatriz Vázquez
- Laboratorio de Higiene Inspección y Control de Alimentos, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago de Compostela, Lugo, Spain
| | - José M Miranda
- Laboratorio de Higiene Inspección y Control de Alimentos, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago de Compostela, Lugo, Spain
| | - Alberto Cepeda
- Laboratorio de Higiene Inspección y Control de Alimentos, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago de Compostela, Lugo, Spain
| | - Carlos M Franco
- Laboratorio de Higiene Inspección y Control de Alimentos, Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Santiago de Compostela, Lugo, Spain
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38
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Qi J, Wang H, Cai L, Wang H, Xu X, Zhou G. Aeromonas salmonicida isolates: Attachment ability and sensitivity to four disinfectants. Food Control 2018. [DOI: 10.1016/j.foodcont.2017.12.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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39
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Vijay A, Arora S, Gupta S, Chhabra M. Halophilic starch degrading bacteria isolated from Sambhar Lake, India, as potential anode catalyst in microbial fuel cell: A promising process for saline water treatment. BIORESOURCE TECHNOLOGY 2018; 256:391-398. [PMID: 29475147 DOI: 10.1016/j.biortech.2018.02.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 02/07/2018] [Accepted: 02/08/2018] [Indexed: 06/08/2023]
Abstract
In this study, Microbial Fuel Cell (MFC) capable of treating saline starch water was developed. Sodium chloride (NaCl) concentrations ranging from 500 mM to 3000 mM were tested at the anode. Nitrate was used as an electron acceptor at the biocathode. The halophilic bacteria were isolated from Sambhar Lake, India. Results indicated successful removal of starch (1.83 kg/m3-d) and nitrate (0.13 kg/m3-d NO3--N) with concomitant power output of 207.05 mW/m2 at 1000 mM NaCl concentration. An increase in power density from 71.06 mW/m2 to 207.05 mW/m2 (2.92 folds) was observed when NaCl concentration was increased from 500 mM to 1000 mM. A decline in power density was observed when the salt concentrations >1000 mM were used. Concentration of 3000 mM supported power output as well as the highest starch degradation (3.2 kg/m3-d) and amylase activity of 2.26 IU/ml. The halophilic exoelectrogens were isolated and identified. The present study demonstrates the utility of MFC for degrading starch in saline water.
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Affiliation(s)
- Ankisha Vijay
- Environmental Biotechnology Laboratory, Department of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur (IIT J), Jodhpur, Rajasthan 342037, India
| | - Shivam Arora
- Environmental Biotechnology Laboratory, Department of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur (IIT J), Jodhpur, Rajasthan 342037, India
| | - Sandeep Gupta
- Department of Mechanical Engineering, Indian Institute of Technology Jodhpur (IIT J), Jodhpur, Rajasthan 342037, India
| | - Meenu Chhabra
- Environmental Biotechnology Laboratory, Department of Bioscience and Bioengineering, Indian Institute of Technology Jodhpur (IIT J), Jodhpur, Rajasthan 342037, India.
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40
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Wang TN, Kaksonen A, Hong PY. Evaluation of two autoinducer-2 quantification methods for application in marine environments. J Appl Microbiol 2018; 124:1469-1479. [DOI: 10.1111/jam.13725] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 12/28/2017] [Accepted: 02/02/2018] [Indexed: 12/25/2022]
Affiliation(s)
- T.-N. Wang
- Division of Biological and Environmental Science and Engineering (BESE); Water Desalination and Reuse Center (WDRC); King Abdullah University of Science and Technology (KAUST); Thuwal Saudi Arabia
| | | | - P.-Y. Hong
- Division of Biological and Environmental Science and Engineering (BESE); Water Desalination and Reuse Center (WDRC); King Abdullah University of Science and Technology (KAUST); Thuwal Saudi Arabia
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41
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The fight for invincibility: Environmental stress response mechanisms and Aeromonas hydrophila. Microb Pathog 2018; 116:135-145. [PMID: 29355702 DOI: 10.1016/j.micpath.2018.01.023] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Revised: 01/15/2018] [Accepted: 01/15/2018] [Indexed: 12/11/2022]
Abstract
Aeromonas hydrophila is a freshwater-dwelling zoonotic bacterium that has economic importance in aquaculture. In the past decade, Aeromonas hydrophila has become increasingly important because of its emergence as a food-borne zoonotic pathogen that is resistant to different treatment regimes. Being an aquatic bacterium, Aeromonas hydrophila is frequently subjected to several stressful environmental conditions, including changes in temperature, acidic pH and starvation that challenge its survival. To cope with these stressful conditions, like every cell, A. hydrophila possesses stress response mechanisms, such as alternative sigma factors, two-component systems, heat shock proteins, cold shock proteins, and acid tolerance response systems that eventually lead the fittest to survive. Moreover, the establishment of genetic variations among the strains related to environmental stress is also of great concern. This review presents the understandings based on inter-strain variations and stress response behavior of A. hydrophila that are important to control the increasing outbreaks of this bacterium in both human populations and aquaculture.
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42
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Zhao J, Quan C, Jin L, Chen M. Production, detection and application perspectives of quorum sensing autoinducer-2 in bacteria. J Biotechnol 2018; 268:53-60. [PMID: 29355813 DOI: 10.1016/j.jbiotec.2018.01.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 12/23/2017] [Accepted: 01/13/2018] [Indexed: 11/17/2022]
Abstract
Autoinducer-2 (AI-2) is a major signal molecule in bacterial quorum sensing (QS) besides N-acyl homoserine lactones (AHLs or AI-1). AI-2 mediated QS pathways have been proved to regulate gene expression and physiological behaviors of bacteria in either intraspecies or interspecies communication. Recent reviews have mainly summarized AI-2 structures, AI-2 mediated QS pathways and the role of AI-2 in gene regulation, etc. In this article, we present a comprehensive review of AI-2 production, detection and applications. Firstly, intracellular AI-2 synthetic routes were outlined and environmental influences on AI-2 production were focused. Furthermore, recent advances in AI-2 detection and quantification were elucidated from an overall perspective. An in-depth understanding of mechanisms and features of various detection methods may facilitate development of new technologies aimed at signal molecule detection. Finally, utilization of AI-2 mediated QS in health improvement, water treatment and drug production indicate promising and extensive application perspectives of QS strategies.
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Affiliation(s)
- Jing Zhao
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, 116600, Dalian, China; College of Life Science, Dalian Minzu University, 116600, Dalian, China
| | - Chunshan Quan
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, 116600, Dalian, China; College of Life Science, Dalian Minzu University, 116600, Dalian, China
| | - Liming Jin
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, 116600, Dalian, China; College of Life Science, Dalian Minzu University, 116600, Dalian, China
| | - Ming Chen
- School of Biological Engineering, Dalian Polytechnic University, 116034, Dalian, China.
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43
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Vijayakumari Nadaraja A, Jayakumaran Nair A, Prameela M, Hari N, Balakrishnan N. Evaluation of currently employed food preservation conditions to tackle biofilm forming food pathogens. J Food Saf 2017. [DOI: 10.1111/jfs.12407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Mary Prameela
- Department of BiotechnologyUniversity of Kerala, Kariavattom CampusThiruvananthapuram 695581 Kerala India
| | - Neethu Hari
- Department of BiotechnologyUniversity of Kerala, Kariavattom CampusThiruvananthapuram 695581 Kerala India
| | - Nidhin Balakrishnan
- Department of BiotechnologyUniversity of Kerala, Kariavattom CampusThiruvananthapuram 695581 Kerala India
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44
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Cai W, Arias CR. Biofilm Formation on Aquaculture Substrates by Selected Bacterial Fish Pathogens. JOURNAL OF AQUATIC ANIMAL HEALTH 2017; 29:95-104. [PMID: 28406736 DOI: 10.1080/08997659.2017.1290711] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The objective of this study was to determine whether common bacterial catfish pathogens could attach and colonize surfaces commonly found in aquaculture facilities. In addition, we evaluated the role of calcium in biofilm formation. Attachment to polystyrene plates was used to quantify biofilm formation by five bacterial pathogens (i.e., Flavobacterium columnare, Aeromonas hydrophila, Edwardsiella ictaluri, E. tarda, and E. piscicida). Flavobacterium columnare and A. hydrophila formed thick biofilms that were enhanced by calcium supplementation. Biofilm formation was significantly lower in all Edwardsiella species tested and calcium had little to no effect on Edwardsiella biofilm formation. Attachment to natural and artificial surfaces was quantified by a standard plate count method. Scanning electron microscopy (SEM) was used to confirm biofilm formation on the substrates. Flavobacterium columnare formed biofilm on the liner, flexible PVC, and nets. Bamboo prevented F. columnare attachment and inhibited cell growth. Aeromonas hydrophila and E. ictaluri formed biofilm on all materials tested, although significant differences were found among substrates. While E. ictaluri failed to form biofilm on microtiter polystyrene plates, it was able to colonize and multiply on all aquaculture materials tested. Our results demonstrated that common bacterial pathogens had the potential of colonizing surfaces and may use biofilm as reservoirs in fish farms. Received July 19, 2016; accepted January 19, 2017.
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Affiliation(s)
- Wenlong Cai
- a Aquatic Microbiology Laboratory, School of Fisheries, Aquaculture, and Aquatic Sciences,Auburn University , 203 Swingle Hall, Auburn , Alabama 36832 , USA
| | - Covadonga R Arias
- a Aquatic Microbiology Laboratory, School of Fisheries, Aquaculture, and Aquatic Sciences,Auburn University , 203 Swingle Hall, Auburn , Alabama 36832 , USA
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45
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Hoel S, Vadstein O, Jakobsen AN. Species Distribution and Prevalence of Putative Virulence Factors in Mesophilic Aeromonas spp. Isolated from Fresh Retail Sushi. Front Microbiol 2017; 8:931. [PMID: 28596762 PMCID: PMC5442234 DOI: 10.3389/fmicb.2017.00931] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 05/08/2017] [Indexed: 12/25/2022] Open
Abstract
Aeromonas spp. are ubiquitous bacteria that have received increasing attention as human pathogens because of their widespread occurrence in food, especially seafood and vegetables. The aim of this work was to assess the species identity and phylogenetic relationship of 118 Aeromonas strains isolated from fresh retail sushi from three producers, and to characterize the isolates with respect to genetic and phenotypic virulence factors. We also evaluate the potential hazard associated with their presence in ready-to-eat seafood not subjected to heat treatment. Mesophilic Aeromonas salmonicida was most prevalent (74%), followed by A. bestiarum (9%), A. dhakensis (5%), A. caviae (5%), A. media (4%), A. hydrophila (2%), and A. piscicola (1%). All isolates were considered potentially pathogenic due to the high prevalence of genes encoding hemolysin (hlyA) (99%), aerolysin (aerA) (98%), cytotoxic enterotoxin (act) (86%), heat-labile cytotonic enterotoxin (alt) (99%), and heat-stable cytotonic enterotoxin (ast) (31%). The shiga-like toxins 1 and 2 (stx-1 and stx-2) were not detected. Moreover, there was heterogeneity in toxin gene distribution among the isolates, and the combination of act/alt/hlyA/aerA was most commonly detected (63%). β-hemolysis was species-dependent and observed in 91% of the isolates. All A. media and A. caviae strains were non-hemolytic. For isolates belonging to this group, lack of hemolysis was possibly related to the absence of the act gene. Swimming motility, linked to adhesion and host invasion, occurred in 65% of the isolates. Partial sequencing of the gyrB gene demonstrated its suitability as a genetic marker for Aeromonas species identification and for assessment of the phylogenetic relationship between the isolates. The gyrB sequence divergence within a given species ranged from 1.3 to 2.9%. A. bestiarum, A. salmonicida, and A. piscicola were the most closely related species; their sequences differed by 2.7-3.4%. The average gyrB sequence similarity between all species was 93%, demonstrating its acceptable taxonomic resolution. The presence of multiple species of potential pathogenic Aeromonas in fresh retail sushi raises new food safety issues related to the increased consumption of ready-to-eat food composed of raw ingredients.
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Affiliation(s)
- Sunniva Hoel
- Department of Biotechnology and Food Science, Norwegian University of Science and TechnologyTrondheim, Norway
| | - Olav Vadstein
- Department of Biotechnology and Food Science, Norwegian University of Science and TechnologyTrondheim, Norway
| | - Anita N Jakobsen
- Department of Biotechnology and Food Science, Norwegian University of Science and TechnologyTrondheim, Norway
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Rodríguez-Sánchez A, Leyva-Díaz JC, Poyatos JM, González-López J. Performance and kinetics of membrane and hybrid moving bed biofilm-membrane bioreactors treating salinity wastewater. AIChE J 2017. [DOI: 10.1002/aic.15694] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alejandro Rodríguez-Sánchez
- Institute of Water Research; University of Granada; Granada 18071 Spain
- Dept. of Civil Engineering; University of Granada; Campus de Fuentenueva Granada 18071 Spain
| | - Juan Carlos Leyva-Díaz
- Institute of Water Research; University of Granada; Granada 18071 Spain
- Dept. of Civil Engineering; University of Granada; Campus de Fuentenueva Granada 18071 Spain
| | - José Manuel Poyatos
- Institute of Water Research; University of Granada; Granada 18071 Spain
- Dept. of Civil Engineering; University of Granada; Campus de Fuentenueva Granada 18071 Spain
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47
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Talagrand-Reboul E, Jumas-Bilak E, Lamy B. The Social Life of Aeromonas through Biofilm and Quorum Sensing Systems. Front Microbiol 2017; 8:37. [PMID: 28163702 PMCID: PMC5247445 DOI: 10.3389/fmicb.2017.00037] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 01/06/2017] [Indexed: 01/25/2023] Open
Abstract
Bacteria of the genus Aeromonas display multicellular behaviors herein referred to as “social life”. Since the 1990s, interest has grown in cell-to-cell communication through quorum sensing signals and biofilm formation. As they are interconnected, these two self-organizing systems deserve to be considered together for a fresh perspective on the natural history and lifestyles of aeromonads. In this review, we focus on the multicellular behaviors of Aeromonas, i.e., its social life. First, we review and discuss the available knowledge at the molecular and cellular levels for biofilm and quorum sensing. We then discuss the complex, subtle, and nested interconnections between the two systems. Finally, we focus on the aeromonad multicellular coordinated behaviors involved in heterotrophy and virulence that represent technological opportunities and applied research challenges.
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Affiliation(s)
- Emilie Talagrand-Reboul
- Équipe Pathogènes Hydriques Santé Environnements, UMR 5569 HSM, Université de MontpellierMontpellier, France; Département d'Hygiène Hospitalière, Centre Hospitalier Régional Universitaire (CHRU) de MontpellierMontpellier, France
| | - Estelle Jumas-Bilak
- Équipe Pathogènes Hydriques Santé Environnements, UMR 5569 HSM, Université de MontpellierMontpellier, France; Département d'Hygiène Hospitalière, Centre Hospitalier Régional Universitaire (CHRU) de MontpellierMontpellier, France
| | - Brigitte Lamy
- Équipe Pathogènes Hydriques Santé Environnements, UMR 5569 HSM, Université de MontpellierMontpellier, France; Département de Bactériologie, Centre Hospitalier Universitaire (CHU) de NiceNice, France
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48
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Tomita K, Sawai J. Preincubation of Escherichia coli ATCC 25922 with NaCl Increases Its Attachment to Lettuce Surfaces Compared with Other Chemicals. Biocontrol Sci 2017; 22:137-143. [PMID: 28954956 DOI: 10.4265/bio.22.137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
The inhibition of microbial attachment to food is important for the prevention of cross-contamination during food processing. The effect of several chemicals that were added in an Escherichia coli growth medium on the attachment of the bacterium to lettuce was investigated. E. coli ATCC 25922, which is reportedly a useful surrogate for E. coli O157:H7 in surface attachment studies, was preincubated in a nutrient broth (NB) containing sodium chloride, potassium chloride, sodium deoxycholate, sodium linear alkylbenzene sulfonate, or sorbic acid. The bacterial cells were placed in contact with cut lettuce in a saline solution at 5℃ for 24 hours. Only the addition of NaCl in the NB influenced the attachment of E. coli, Salmonella enterica subsp. Enteritidis, and Klebsiella pneumoniae to the lettuce. The attachment of E. coli showed the largest significant increase at 2% NaCl. Changes in the attachment levels were not due to surface hydrohobicity or the motility of E. coli cells. Similar results were observed for S. enterica although the variation in the degree of attachment of the latter was quite small. These results suggested that the attachment of E. coli O157:H7 to food surfaces is influenced by the bacterial growth conditions prior to food exposure and prior to the development of the biofilm; furthermore, the environmental NaCl concentration should be controlled during food processing to prevent the cross-contamination of foods with E. coli.
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Affiliation(s)
- Kazuhisa Tomita
- Faculty of Applied Bioscience, Kanagawa Institute of Technology
| | - Jun Sawai
- Faculty of Applied Bioscience, Kanagawa Institute of Technology
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49
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Biofilm formation by Vibrio parahaemolyticus on food and food contact surfaces increases with rise in temperature. Food Control 2016. [DOI: 10.1016/j.foodcont.2016.05.054] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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50
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Shi Z, Baker CA, Lee SI, Park SH, Kim SA, Ricke SC. Comparison of methods for quantitating Salmonella enterica Typhimurium and Heidelberg strain attachment to reusable plastic shipping container coupons and preliminary assessment of sanitizer efficacy. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2016; 51:602-608. [PMID: 27192211 DOI: 10.1080/03601234.2016.1181905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Salmonella serovars, one of the leading contributors to foodborne illness and are especially problematic for foods that are not cooked before consumption, such as fresh produce. The shipping containers that are used to transport and store fresh produce may play a role in cross contamination and subsequent illnesses. However, methods for quantitatively attached cells are somewhat variable. The overall goal of this study was to compare conventional plating with molecular methods for quantitating attached representative strains for Salmonella Typhimurium and Heidelberg on reusable plastic containers (RPC) coupons, respectively. We attached Salmonella enterica serovar Typhimurium ATCC 14028 and serovar Heidelberg SL486 (parent and an antibiotic resistant marker strain) to plastic coupons (2.54 cm(2)) derived from previously used shipping containers by growing for 72 h in tryptic soy broth. The impact of the concentration of sanitizer on log reductions between unsanitized and sanitized coupons was evaluated by exposing attached S. Typhimurium cells to 200 ppm and 200,000 ppm sodium hypochlorite (NaClO). Differences in sanitizer effectiveness between serovars were also evaluated with attached S. Typhimurium compared to attached S. Heidelberg populations after being exposed to 200 ppm peracetic acid (PAA). Treatment with NaClO caused an average of 2.73 ± 0.23 log CFU of S. Typhimurium per coupon removed with treatment at 200 ppm while 3.36 ± 0.54 log CFU were removed at 200,000 ppm. Treatment with PAA caused an average of 2.62 ± 0.15 log CFU removed for S. Typhimurium and 1.41 ± 0.17 log CFU for S. Heidelberg (parent) and 1.61 ± 0.08 log CFU (marker). Lastly, scanning electron microscopy (SEM) was used to visualize cell attachment and coupon surface topography. SEM images showed that remaining attached cell populations were visible even after sanitizer application. Conventional plating and qPCR yielded similar levels of enumerated bacterial populations indicating a high concordance between the two methods. Therefore, qPCR could be used for the rapid quantification of Salmonella attached on RPC.
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Affiliation(s)
- Zhaohao Shi
- a Center for Food Safety and Department of Food Science, University of Arkansas , Fayetteville , Arkansas , USA
| | - Christopher A Baker
- a Center for Food Safety and Department of Food Science, University of Arkansas , Fayetteville , Arkansas , USA
| | - Sang In Lee
- a Center for Food Safety and Department of Food Science, University of Arkansas , Fayetteville , Arkansas , USA
| | - Si Hong Park
- a Center for Food Safety and Department of Food Science, University of Arkansas , Fayetteville , Arkansas , USA
| | - Sun Ae Kim
- a Center for Food Safety and Department of Food Science, University of Arkansas , Fayetteville , Arkansas , USA
| | - Steven C Ricke
- a Center for Food Safety and Department of Food Science, University of Arkansas , Fayetteville , Arkansas , USA
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