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Peng C, Tang J, Zhou X, Zhou H, Zhang Y, Wang S, Wang W, Xiang W, Zhang Q, Yu X, Cai T. Quantitative proteomic analysis reveals the mechanism and key esterase of β-cypermethrin degradation in a bacterial strain from fermented food. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2024; 201:105858. [PMID: 38685237 DOI: 10.1016/j.pestbp.2024.105858] [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: 01/22/2024] [Revised: 03/01/2024] [Accepted: 03/07/2024] [Indexed: 05/02/2024]
Abstract
Beta-cypermethrin (β-CY) residues in food are an important threat to human health. Microorganisms can degrade β-CY residues during fermentation of fruits and vegetables, while the mechanism is not clear. In this study, a comprehensively investigate of the degradation mechanism of β-CY in a food microorganism was conducted based on proteomics analysis. The β-CY degradation bacteria Gordonia alkanivorans GH-1 was derived from fermented Pixian Doubanjiang. Its crude enzyme extract could degrade 77.11% of β-CY at a concentration of 45 mg/L within 24 h. Proteomics analysis revealed that the ester bond of β-CY is broken under the action of esterase to produce 3-phenoxy benzoic acid, which was further degraded by oxidoreductase and aromatic degrading enzyme. The up-regulation expression of oxidoreductase and esterase was confirmed by transcriptome and quantitative reverse transcription PCR. Meanwhile, the expression of esterase Est280 in Escherichia coli BL21 (DE3) resulted in a 48.43% enhancement in the degradation efficiency of β-CY, which confirmed that this enzyme was the key enzyme in the process of β-CY degradation. This study reveals the degradation mechanism of β-CY by microorganisms during food fermentation, providing a theoretical basis for the application of food microorganisms in β-CY residues.
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Affiliation(s)
- Chuanning Peng
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China
| | - Jie Tang
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China; Food Microbiology Key Laboratory of Sichuan Province, Xihua University, Chengdu 610039, Sichuan, China; Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, Chengdu 610039, China.
| | - Xuerui Zhou
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China
| | - Hu Zhou
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China
| | - Yingyue Zhang
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China
| | - Su Wang
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China
| | - Wanting Wang
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China
| | - Wenliang Xiang
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China; Food Microbiology Key Laboratory of Sichuan Province, Xihua University, Chengdu 610039, Sichuan, China
| | - Qing Zhang
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China; Food Microbiology Key Laboratory of Sichuan Province, Xihua University, Chengdu 610039, Sichuan, China
| | - Xuan Yu
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China; Food Microbiology Key Laboratory of Sichuan Province, Xihua University, Chengdu 610039, Sichuan, China
| | - Ting Cai
- School of Food and Bioengineering, Xihua University, Chengdu 610039, Sichuan, People's Republic of China; Food Microbiology Key Laboratory of Sichuan Province, Xihua University, Chengdu 610039, Sichuan, China
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2
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Peng H, Zhou G, Yang XM, Chen GJ, Chen HB, Liao ZL, Zhong QP, Wang L, Fang X, Wang J. Transcriptomic Analysis Revealed Antimicrobial Mechanisms of Lactobacillus rhamnosus SCB0119 against Escherichia coli and Staphylococcus aureus. Int J Mol Sci 2022; 23:ijms232315159. [PMID: 36499483 PMCID: PMC9739798 DOI: 10.3390/ijms232315159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/26/2022] [Accepted: 11/27/2022] [Indexed: 12/03/2022] Open
Abstract
Lactic acid bacteria were reported as a promising alternative to antibiotics against pathogens. Among them, Lactobacillus rhamnosus could be used as probiotics and inhibit several pathogens, but its antibacterial mechanisms are still less known. Here, L. rhamnosus SCB0119 isolated from fermented pickles could inhibit bacterial growth or even cause cell death in Escherichia coli ATCC25922 and Staphylococcus aureus ATCC6538, which was mainly attributed to the cell-free culture supernatant (CFS). Moreover, CFS induced the accumulation of reactive oxygen species and destroyed the structure of the cell wall and membrane, including the deformation in cell shape and cell wall, the impairment of the integrity of the cell wall and inner membrane, and the increases in outer membrane permeability, the membrane potential, and pH gradient in E. coli and S. aureus. Furthermore, the transcriptomic analysis demonstrated that CFS altered the transcripts of several genes involved in fatty acid degradation, ion transport, and the biosynthesis of amino acids in E. coli, and fatty acid degradation, protein synthesis, DNA replication, and ATP hydrolysis in S. aureus, which are important for bacterial survival and growth. In conclusion, L. rhamnosus SCB0119 and its CFS could be used as a biocontrol agent against E. coli and S. aureus.
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Affiliation(s)
- Huan Peng
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Gang Zhou
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
- Guangdong Open Laboratory of Applied Microbiology, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Xi-Miao Yang
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Guo-Jun Chen
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Hai-Bin Chen
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Zhen-Lin Liao
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Qing-Ping Zhong
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Li Wang
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Xiang Fang
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
- Correspondence: (X.F.); (J.W.)
| | - Jie Wang
- College of Food Science, South China Agricultural University, Guangzhou 510642, China
- Correspondence: (X.F.); (J.W.)
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Liu M, Pan Y, Feng M, Guo W, Fan X, Feng L, Huang J, Cao Y. Garlic essential oil in water nanoemulsion prepared by high-power ultrasound: Properties, stability and its antibacterial mechanism against MRSA isolated from pork. ULTRASONICS SONOCHEMISTRY 2022; 90:106201. [PMID: 36244094 PMCID: PMC9579707 DOI: 10.1016/j.ultsonch.2022.106201] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/08/2022] [Accepted: 10/10/2022] [Indexed: 06/12/2023]
Abstract
Food-borne methicillin-resistance Staphylococcus aureus (MRSA) has caused significant health threats and economic loss in livestock and poultry products. Garlic essential oil (GEO) is an effective antibacterial agent but presents strong instability and hydrophobicity. In this study, GEO in water nanoemulsion (GEON) with good stability was produced by emulsification technique of high-power ultrasound. Its antibacterial activity and underlying mechanism against MRSA isolated from retailed pork were investigated. Results showed that ultrasonic treatment significantly reduced the particle size of GENO from 820.3 to 215.0 nm as time increased from 0 to 10 min. Comparatively, GEON of 10 min ultrasound was more stable than other GEONs (0, 1, 5 min) during 30 d storage. It also displayed good thermal stability and relatively good ion stability (NaCl, MgCl2, and glucose). Antibacterial analysis showed that GEON (10 min) exhibited the best anti-MRSA activity among all GEONs, and the minimum inhibitory concentration of GEO in this nanoemulsion was 0.125 % (1.25 mg/mL). Treatment of GEON (10 min) significantly suppressed the cell proliferation of MRSA, which was mainly achieved by damaging the cell membrane as evidenced by membrane depolarization and considerable leakage of intracellular nucleic acids and protein. Laser scanning confocal microscope and scanning electron microscopy showed that treatment of GEON (10 min) significantly altered the membrane integrity and severely damaged the cellular membrane and structure. The present work illustrated that GEON produced by ultrasonic emulsification is a promising alternative to inhibit the contamination and spread of MRSA in livestock and poultry products.
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Affiliation(s)
- Miaomiao Liu
- School of Food Science and Engineering, and Natural Food Macromolecule Research Center, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Yue Pan
- School of Food Science and Engineering, and Natural Food Macromolecule Research Center, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Mingxing Feng
- Department of Life Science, Yuncheng University, Yuncheng 044000, China
| | - Wei Guo
- School of Food Science and Engineering, and Natural Food Macromolecule Research Center, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Xin Fan
- School of Food Science and Engineering, and Natural Food Macromolecule Research Center, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Li Feng
- School of Food Science and Engineering, and Natural Food Macromolecule Research Center, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Junrong Huang
- School of Food Science and Engineering, and Natural Food Macromolecule Research Center, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Yungang Cao
- School of Food Science and Engineering, and Natural Food Macromolecule Research Center, Shaanxi University of Science & Technology, Xi'an 710021, China.
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Effects of cinnamaldehyde against planktonic bacteria and biofilm formation of Shigella flexneri. Microb Pathog 2022; 171:105741. [PMID: 36038086 DOI: 10.1016/j.micpath.2022.105741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 08/22/2022] [Accepted: 08/23/2022] [Indexed: 11/24/2022]
Abstract
Cinnamaldehyde (CA) has demonstrated anti-inflammatory, anti-tumor and anti-cancer activities; Its antimicrobial and antibiofilm actions against Shigella flexneri, on the other hand, have not been investigated. Sh. flexneri is a gram-negative foodborne pathogen that can be widely found in nature and some industrial production environments. In this current research, our aim was to examine the influences of CA on planktonic bacteria and biofilm formation. The minimum inhibitory concentration (MIC) of CA against Sh. flexneri strain was 100 μg/mL, while bacteria treated with CA showed a longer lag phase compared with the untreated control. CA effectively inactivated the Sh. flexneri in LB broth and fresh lettuce juice. CA treatment resulted in cell membrane permeability changes and dysfunction, as proven by cell membrane depolarization, decreased intracellular ATP concentration. In addition, CA was also discovered to increase the level of reactive oxygen species (ROS) in cells, and induce morphological changes in cells. Crystal violet staining showed that the biomass of biofilm was decreased significantly with CA in 24 h. Light microscopy and field emission scanning electron microscopy (FESEM) observations demonstrated decreased biofilm adhesion and destruction of biofilm architecture after treatment with CA. These findings indicated that CA acts as a natural bacteriostatic agent to control Sh. flexneri in food processing and production.
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Dhamale T, Saha BK, Papade SE, Singh S, Phale PS. A unique global metabolic trait of Pseudomonas bharatica CSV86 T: metabolism of aromatics over simple carbon sources and co-metabolism with organic acids. MICROBIOLOGY (READING, ENGLAND) 2022; 168. [PMID: 35925665 DOI: 10.1099/mic.0.001206] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Hierarchical utilization of substrate by microbes (utilization of simple carbon sources prior to complex ones) poses a major limitation to the efficient remediation of aromatic pollutants. Aromatic compounds, being complex and reduced in nature, appear to be a deferred choice as the carbon source in the presence of a plethora of simple organic compounds in the environment. The soil bacterium Pseudomonas bharatica CSV86T displays a unique carbon source utilization hierarchy. It preferentially utilizes aromatics over glucose and co-metabolizes them with succinate or pyruvate (Basu et al., 2006, Applied and Environmental Microbiology, 72 : 22226-2230). In the present study, the substrate utilization hierarchy for strain CSV86T was tested for additional simple carbon sources such as glycerol, acetate, and tri-carboxylic acid (TCA) cycle intermediates like α-ketoglutarate and fumarate. When grown on a mixture of aromatics (benzoate or naphthalene) plus glycerol, the strain displayed a diauxic growth profile with significantly high activity of aromatic utilization enzymes (catechol 1,2- or 2,3-dioxygenase, respectively) in the first-log phase. This suggests utilization of aromatics in the first-log phase followed by glycerol in the second-log phase. On a mixture of an aromatic plus organic acid (acetate, α-ketoglutarate or fumarate), the strain displayed a monoauxic growth profile, indicating co-metabolism. Interestingly, the presence of glycerol, acetate, α-ketoglutarate or fumarate does not repress metabolism/utilization of the aromatic. Thus, the substrate utilization hierarchy of strain CSV86T is aromatics=organic acids>glucose/glycerol, which is unique as compared to other Pseudomonas species, where degradation of aromatics is repressed by glycerol, glucose, acetate or organic acids, including TCA cycle intermediates. This novel substrate utilization hierarchy appears to be a global metabolic phenomenon in strain CSV86T, thus implying it to be an ideal host for metabolic engineering as well as for its potential application in bioremediation.
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Affiliation(s)
- Tushar Dhamale
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Powai, Mumbai 400 076, India
| | - Braja Kishor Saha
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Powai, Mumbai 400 076, India
| | - Sandesh E Papade
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Powai, Mumbai 400 076, India
| | - Srushti Singh
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Powai, Mumbai 400 076, India.,Present address: Presently affiliated to TCR Therapeutics, Inc., 100 Binney Street, Cambridge, MA 02142, USA
| | - Prashant S Phale
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Powai, Mumbai 400 076, India
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6
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Kang S, Li X, Xing Z, Liu X, Bai X, Yang Y, Guo D, Xia X, Zhang C, Shi C. Antibacterial effect of citral on yersinia enterocolitica and its mechanism. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108775] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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7
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Mutanda I, Sun J, Jiang J, Zhu D. Bacterial membrane transporter systems for aromatic compounds: Regulation, engineering, and biotechnological applications. Biotechnol Adv 2022; 59:107952. [DOI: 10.1016/j.biotechadv.2022.107952] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 03/20/2022] [Accepted: 04/02/2022] [Indexed: 12/13/2022]
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8
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Liu T, Shen H, Wang F, Zhou X, Zhao P, Yang Y, Guo Y. Thinned-Young Apple Polyphenols Inhibit Halitosis-Related Bacteria Through Damage to the Cell Membrane. Front Microbiol 2022; 12:745100. [PMID: 35281303 PMCID: PMC8905352 DOI: 10.3389/fmicb.2021.745100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 12/27/2021] [Indexed: 01/10/2023] Open
Abstract
The thinned young apple is a by-product and is generally discarded in the orchard during fruit thinning. The polyphenol content of thinned young apples is about 10 times more than that of ripe apples. In our study, the antibacterial effect of thinned young apple polyphenols (YAP) on the halitosis-related bacteria including Porphyromonas gingivalis, Prevotella intermedius, and Fusobacterium nucleatum was investigated. The minimum inhibitory concentrations of YAP against P. gingivalis, P. intermedia, and F. nucleatum were 8.0, 8.0, and 12.0 mg/ml, while the minimum bactericidal concentrations were 10.0, 10.0, and 14.0 mg/ml, respectively. The scanning electron microscopy and transmission electron microscopy analyses showed that after YAP treatment, the membrane surface of halitosis-related bacterial cells was coarse and the cell wall and membrane were separated and eventually ruptured. The integrity of the cell membrane was determined by flow cytometry, indicating that the cells with the integrity membrane significantly reduced as the YAP concentration treatment increased. The release of proteins and nucleic acids into the cell suspension significantly increased, and the membrane potential reduced after the YAP treatment. This research illustrated the antibacterial mechanism of YAP against halitosis-related bacteria and provided a scientific basis of utilizing the polyphenols from the discarded thinned young apples.
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Affiliation(s)
- Ting Liu
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, China.,National Research and Development Center of Apple Processing Technology, Xi'an, China
| | - Hailiang Shen
- Citrus Research Institute, Southwest University, Chongqing, China.,Citrus Research Institute, Chinese Academy of Agricultural Sciences, Chongqing, China
| | - Furong Wang
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, China.,National Research and Development Center of Apple Processing Technology, Xi'an, China
| | - Xueru Zhou
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, China.,National Research and Development Center of Apple Processing Technology, Xi'an, China
| | - Pengtao Zhao
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, China.,National Research and Development Center of Apple Processing Technology, Xi'an, China
| | - Yali Yang
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, China.,National Research and Development Center of Apple Processing Technology, Xi'an, China
| | - Yurong Guo
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an, China.,National Research and Development Center of Apple Processing Technology, Xi'an, China
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Metabolic Changes in Seed Embryos of Hypoxia-Tolerant Rice and Hypoxia-Sensitive Barley at the Onset of Germination. PLANTS 2021; 10:plants10112456. [PMID: 34834819 PMCID: PMC8622212 DOI: 10.3390/plants10112456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/03/2021] [Accepted: 11/11/2021] [Indexed: 11/29/2022]
Abstract
Rice (Oryza sativa L.) and barley (Hordeum vulgare L.) are the cereal species differing in tolerance to oxygen deficiency. To understand metabolic differences determining the sensitivity to low oxygen, we germinated rice and barley seeds and studied changes in the levels of reactive oxygen species (ROS) and reactive nitrogen species (RNS), activities of the enzymes involved in their scavenging, and measured cell damage parameters. The results show that alcohol dehydrogenase activity was higher in rice than in barley embryos providing efficient anaerobic fermentation. Nitric oxide (NO) levels were also higher in rice embryos indicating higher NO turnover. Both fermentation and NO turnover can explain higher ATP/ADP ratio values in rice embryos as compared to barley. Rice embryos were characterized by higher activity of S-nitrosoglutathione reductase than in barley and a higher level of free thiols in proteins. The activities of antioxidant enzymes (superoxide dismutase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase) in imbibed embryos were higher in rice than in barley, which corresponded to the reduced levels of ROS, malonic dialdehyde and electrolyte leakage. The observed differences in metabolic changes in embryos of the two cereal species differing in tolerance to hypoxia can partly explain the adaptation of rice to low oxygen environments.
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Jia R, Ge S, Ren S, Luo Y, Xiu L, Sanabil, Liu H, Cai D. Antibacterial mechanism of adzuki bean seed coat polyphenols and their potential application in preservation of fresh raw beef. Int J Food Sci Technol 2021. [DOI: 10.1111/ijfs.15292] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Rui Jia
- College of Food Science and Engineering Jilin Agricultural University Changchun China
- National Engineering laboratory for Wheat and Corn Deep Processing Changchun China
| | - Sitong Ge
- College of Food Science and Engineering Jilin Agricultural University Changchun China
- National Engineering laboratory for Wheat and Corn Deep Processing Changchun China
| | - Shida Ren
- College of Food Science and Engineering Jilin Agricultural University Changchun China
- National Engineering laboratory for Wheat and Corn Deep Processing Changchun China
| | - Yanfei Luo
- ChangChun Customs District P.R.CHINA Changchun China
| | - Lin Xiu
- College of Food Science and Engineering Jilin Agricultural University Changchun China
- National Engineering laboratory for Wheat and Corn Deep Processing Changchun China
| | - Sanabil
- College of Food Science and Engineering Jilin Agricultural University Changchun China
- National Engineering laboratory for Wheat and Corn Deep Processing Changchun China
- University of Central Punjab Lahore Pakistan
| | - Huimin Liu
- College of Food Science and Engineering Jilin Agricultural University Changchun China
- National Engineering laboratory for Wheat and Corn Deep Processing Changchun China
| | - Dan Cai
- College of Food Science and Engineering Jilin Agricultural University Changchun China
- National Engineering laboratory for Wheat and Corn Deep Processing Changchun China
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11
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Huang Y, Wang H, Huang K, Huang D, Yin S, Guo Q. Degradation kinetics and mechanism of 3-Chlorobenzoic acid in anoxic water environment using graphene/TiO 2 as photocatalyst. ENVIRONMENTAL TECHNOLOGY 2020; 41:2165-2179. [PMID: 30526405 DOI: 10.1080/09593330.2018.1556741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Accepted: 12/03/2018] [Indexed: 06/09/2023]
Abstract
Degradation kinetics and mechanism of 3-Chlorobenzoic acid (3-CBA) in anoxic water environment using graphene/TiO2 (GR/TiO2) as photocatalyst had been investigated. The effects of various parameters such as catalyst dosage, pH, initial concentration, catalyst reuse and dissolved oxygen (DO) on 3-CBA photocatalytic degradation kinetics were studied. The qualitative and quantitative analysis for degradation intermediate products and parent compound were studied by using HPLC, HPLC/MS/MS and IC technologies. The results show that the residual concentration of 3-CBA has a good linear relationship and its correlation coefficient R 2 are all greater than 0.985 by Langmuir-Hinshelwood (L-H) dynamic model under different photocatalytic degradation conditions. Some oxidative degradation products such as 3-chlorophenol, resorcinol, and hydroxyquinol are generated, and some reductive degradation products such as 3-chlorobenzaldehyde, 3-hydroxybenzaldehyde, 3-hydroxybenzyl alcohol, and cyclohexanediol are produced, and part of 3-CBA are mineralized to generate CO2 when DO is in the range of 0.5-1.0 mg/L; When DO is less than 0.28 mg/L, photocatalytic reduction mainly occurs. The results provide a theoretical basis for photocatalytic in situ remediation of pollutants in anoxic water environment.
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Affiliation(s)
- Yiyang Huang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Hui Wang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Kai Huang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, People's Republic of China
| | - Donggen Huang
- School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang, People's Republic of China
| | - Shuang Yin
- School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang, People's Republic of China
| | - Qin Guo
- School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang, People's Republic of China
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12
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Zhang H, Gao Y, Zhu G, Li B, Gou J, Cheng X. Synthesis of PbS/TiO2 nano-tubes photoelectrode and its enhanced visible light driven photocatalytic performance and mechanism for purification of 4-chlorobenzoic acid. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.115697] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Wang H, Jiang Y, Zhang Y, Zhang Z, Yang X, Ali MA, Fox EM, Gobius KS, Man C. Silver nanoparticles: A novel antibacterial agent for control of Cronobacter sakazakii. J Dairy Sci 2018; 101:10775-10791. [PMID: 30316605 DOI: 10.3168/jds.2018-15258] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 08/24/2018] [Indexed: 11/19/2022]
Abstract
Silver nanoparticles (AgNP) have been widely applied because of their broad spectrum of antimicrobial activities against bacteria, fungi, and viruses. However, little research has been done to evaluate their effects on Cronobacter sakazakii, an opportunistic pathogen usually infecting infants and having a high fatality rate. The aims of this work were to investigate the antibacterial property of novel, synthesized, positively charged silver nanoparticles against C. sakazakii and to discuss the potential antibacterial mechanisms involved. In this study, the spherical and face-centered cubic silver nanoparticles had a mean particle size of 31.2 nm and were synthesized by reducing Ag+ using citrate and dispersed by glycerol and polyvinylpyrrolidone (PVP) under alkaline conditions. Minimum inhibitory concentrations (MIC) and inhibition zone tests showed that the AgNP exhibited strong antibacterial activity against 4 tested C. sakazakii strains with mean MIC of 62.5 to 125 mg/L and average inhibition zone diameters of 13.8 to 16.3 mm. Silver nanoparticles caused cell membrane injury accompanied by adsorption of AgNP onto the cell surface, as shown by changes in cell morphology, cell membrane hyperpolarization, and accelerated leakage of intracellular reducing sugars and proteins outward from the cytoplasm. In addition, dysfunction of the respiratory chain was induced after treatment with AgNP, which was supported by a decrease in intracellular ATP and inhibition of related dehydrogenases. This research indicates that AgNP could be a novel and efficient antibacterial agent to control C. sakazakii contamination in environments producing powdered infant formulas from milk.
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Affiliation(s)
- Hui Wang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin, China, 150030
| | - Yujun Jiang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin, China, 150030
| | - Yashuo Zhang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin, China, 150030
| | - Ziwei Zhang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin, China, 150030
| | - Xinyan Yang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin, China, 150030
| | - Md Aslam Ali
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin, China, 150030; Department of Agro-Processing, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh
| | - Edward M Fox
- CSIRO Agriculture and Food, Werribee VIC 3030, Australia
| | - Kari S Gobius
- CSIRO Agriculture and Food, Werribee VIC 3030, Australia
| | - Chaoxin Man
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science and Engineering, Northeast Agricultural University, Harbin, China, 150030.
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Wang G, Ma F, Chen X, Han Y, Wang H, Xu X, Zhou G. Transcriptome Analysis of the Global Response of Pseudomonas fragi NMC25 to Modified Atmosphere Packaging Stress. Front Microbiol 2018; 9:1277. [PMID: 29942299 PMCID: PMC6004401 DOI: 10.3389/fmicb.2018.01277] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 05/25/2018] [Indexed: 11/17/2022] Open
Abstract
Pseudomonas fragi is usually isolated from chilled meats in relation to their spoilage, while many studies have shown that the application of modified atmosphere packaging (MAP) inhibits the spoilage potential of P. fragi. The effects of MAP on P. fragi NMC25 metabolism were determined in the present study by exposing this organism to different air conditions and comparing the resulting transcriptome profiles. We found 559 differentially expressed genes by RNA-seq, and the results revealed that MAP decreases the expression of genes involved in the electron transport chain (nuoAB), resulting in an inhibition of aerobic respiration. Meanwhile, MAP also induced the downregulation of genes responsible for ATP-binding cassette transporters, flagellar and type I fimbrial proteins, and DNA replication and repair, which may further influence nutrient uptake, motility, and growth. In addition, NMC25 cells modified their pathways for energy production, amino acid synthesis, membrane lipid composition, and other metabolic patterns to adapt to MAP. These data show that P. fragi NMC25 survives under MAP but reduces part of its metabolism related to its spoilage ability.
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Affiliation(s)
- Guangyu Wang
- Key Laboratory of Meat Processing and Quality Control, Nanjing Agricultural University, Nanjing, China
| | - Fang Ma
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Xiaojing Chen
- Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Yanqing Han
- Jiangsu Province Physical and Chemical Testing Center, Nanjing, China
| | - Huhu Wang
- Key Laboratory of Meat Processing and Quality Control, Nanjing Agricultural University, Nanjing, China
| | - Xinglian Xu
- Key Laboratory of Meat Processing and Quality Control, Nanjing Agricultural University, Nanjing, China
| | - Guanghong Zhou
- Key Laboratory of Meat Processing and Quality Control, Nanjing Agricultural University, Nanjing, China
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Ma Z, Marsolais F, Bykova NV, Igamberdiev AU. Nitric Oxide and Reactive Oxygen Species Mediate Metabolic Changes in Barley Seed Embryo during Germination. FRONTIERS IN PLANT SCIENCE 2016; 7:138. [PMID: 26909088 PMCID: PMC4754656 DOI: 10.3389/fpls.2016.00138] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 01/27/2016] [Indexed: 05/20/2023]
Abstract
The levels of nitric oxide (NO) and reactive oxygen species (ROS), ATP/ADP ratios, reduction levels of ascorbate and glutathione, expression of the genes encoding proteins involved in metabolism of NO and activities of the enzymes involved in fermentation and in metabolism of NO and ROS were studied in the embryos of germinating seeds of two barley (Hordeum vulgare L.) cultivars differing in dormancy level. The level of NO production continuously increased after imbibition while the level of nitrosylated SH-groups in proteins increased. This corresponded to the decrease of free SH-groups in proteins. At early stage of germination (0-48 h post imbibition) the genes encoding class 1 phytoglobin (the protein scavenging NO) and S-nitrosoglutathione reductase (scavenging S-nitrosoglutathione) were markedly expressed. More dormant cultivar exhibited lower ATP/ADP and ascorbate/dehydroascorbate ratios and lower lactate and alcohol dehydrogenase activities, while the production of NO and nitrosylation of proteins was higher as compared to the non-dormant cultivar. The obtained data indicate that at the onset of germination NO is actively generated causing nitrosylation of SH-groups and a switch from respiration to fermentation. After radicle protrusion the metabolism changes in a more reducing type as recorded by ratio of reduced and oxidized glutathione and ascorbate. The turnover of NO by the scavenging systems (phytoglobin, S-nitrosoglutathione reductase and interaction with ROS) might contribute to the maintenance of redox and energy balance of germinating seeds and lead to alleviation of dormancy.
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Affiliation(s)
- Zhenguo Ma
- Department of Biology, Memorial University of Newfoundland, St. John’sNL, Canada
- Genomics and Biotechnology, London Research and Development Centre, Agriculture and Agri-Food CanadaLondon, ON, Canada
- Department of Biology, University of Western OntarioLondon, ON, Canada
| | - Frédéric Marsolais
- Genomics and Biotechnology, London Research and Development Centre, Agriculture and Agri-Food CanadaLondon, ON, Canada
- Department of Biology, University of Western OntarioLondon, ON, Canada
| | - Natalia V. Bykova
- Morden Research and Development Centre, Agriculture and Agri-Food CanadaMorden, MB, Canada
| | - Abir U. Igamberdiev
- Department of Biology, Memorial University of Newfoundland, St. John’sNL, Canada
- *Correspondence: Abir U. Igamberdiev,
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Shi C, Sun Y, Zheng Z, Zhang X, Song K, Jia Z, Chen Y, Yang M, Liu X, Dong R, Xia X. Antimicrobial activity of syringic acid against Cronobacter sakazakii and its effect on cell membrane. Food Chem 2015; 197:100-6. [PMID: 26616929 DOI: 10.1016/j.foodchem.2015.10.100] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 10/17/2015] [Accepted: 10/19/2015] [Indexed: 01/24/2023]
Abstract
Syringic acid (SA) has been reported to exhibit antibacterial ability against various microorganisms, but little work has been done on its effect on Cronobacter sakazakii. In this study, minimum inhibitory concentrations (MICs) of SA against various C. sakazakii strains were determined. Moreover, changes in intracellular ATP concentration, intracellular pH (pHin), membrane potential and membrane integrity were measured to evaluate the influence of SA on cell membrane. Finally, field emission scanning electron microscope (FESEM) was used to assess the morphological changes of bacterial cells caused by SA. It was shown that the MICs of SA against all tested C. sakazakii strains were 5mg/mL. SA retarded bacterial growth, and caused cell membrane dysfunction, which was evidenced by intracellular ATP concentration decrease, pHin reduction, cell membrane hyperpolarization and changes in cellular morphology. These findings indicated that SA has potential to be developed as a natural preservative to control C. sakazakii in foods associated with this pathogen and prevent related infections.
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Affiliation(s)
- Chao Shi
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yi Sun
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zhiwei Zheng
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiaorong Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Kaikuo Song
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zhenyu Jia
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yifei Chen
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Miaochun Yang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xin Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Rui Dong
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiaodong Xia
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
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Steady-state hydrogen peroxide induces glycolysis in Staphylococcus aureus and Pseudomonas aeruginosa. J Bacteriol 2014; 196:2499-513. [PMID: 24769698 DOI: 10.1128/jb.01538-14] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from human pathogens Staphylococcus aureus and Pseudomonas aeruginosa can be readily inhibited by reactive oxygen species (ROS)-mediated direct oxidation of their catalytic active cysteines. Because of the rapid degradation of H2O2 by bacterial catalase, only steady-state but not one-dose treatment with H2O2 rapidly induces glycolysis and the pentose phosphate pathway (PPP). We conducted transcriptome sequencing (RNA-seq) analyses to globally profile the bacterial transcriptomes in response to a steady level of H2O2, which revealed profound transcriptional changes, including the induced expression of glycolytic genes in both bacteria. Our results revealed that the inactivation of GAPDH by H2O2 induces metabolic levels of glycolysis and the PPP; the elevated levels of fructose 1,6-biphosphate (FBP) and 2-keto-3-deoxy-6-phosphogluconate (KDPG) lead to dissociation of their corresponding glycolytic repressors (GapR and HexR, respectively) from their cognate promoters, thus resulting in derepression of the glycolytic genes to overcome H2O2-stalled glycolysis in S. aureus and P. aeruginosa, respectively. Both GapR and HexR may directly sense oxidative stresses, such as menadione.
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Shetty A, Hickey WJ. Effects of outer membrane vesicle formation, surface-layer production and nanopod development on the metabolism of phenanthrene by Delftia acidovorans Cs1-4. PLoS One 2014; 9:e92143. [PMID: 24642639 PMCID: PMC3958437 DOI: 10.1371/journal.pone.0092143] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 02/18/2014] [Indexed: 11/18/2022] Open
Abstract
Nanopods are extracellular structures arising from the convergence of two widely distributed bacterial characteristics: production of outer membrane vesicles (OMV) and formation of surface layers (S-layers). Nanopod production is driven by OMV formation, and in Delftia acidovorans Cs1-4 growth on phenanthrene induces OMV/nanopod formation. While OMV production has been associated with many functions, particularly with pathogens, linkage to biodegradation has been limited to a membrane stress response to lipophilic compounds. The objectives of this study were to determine: 1.) Whether induction of nanopod formation was linked to phenanthrene metabolism or a non-specific membrane stress response, and 2.) The relative importance of OMV/nanopod formation vs. formation of the S-layer alone to phenanthrene utilization. Membrane stress response was investigated by quantifying nanopod formation following exposure to compounds that exceeded phenanthrene in membrane stress-inducing potential. Naphthalene did not induce nanopod formation, and toluene was a weak inducer compared to phenanthrene (two- vs. six-fold increase, respectively). Induction of nanopod formation by growth on phenanthrene was therefore linked to phenanthrene metabolism and not a membrane stress response. Impacts on phenanthrene biodegradation of OMV/nanopod production vs. S-layer formation were assessed with D. acidovorans Cs1-4 mutants deficient in S-layer formation or OMV/nanopod production. Both mutants had impaired growth on phenanthrene, but the loss of OMV/nanopod production was more significant than loss of the S-layer. The S-layer of D. acidovorans Cs1-4 did not affect phenanthrene uptake, and its primary role in phenanthrene biodegradation process appeared to be enabling nanopod development. Nanopods appeared to benefit phenanthrene biodegradation by enhancing cellular retention of metabolites. Collectively, these studies established that nanopod/OMV formation was an essential characteristic of the D. acidovorans Cs1-4 phenanthrene degradation process. This report thus established a new dimension in the area of biodegradation, namely, the involvement of extracellular structures as elements supporting metabolic processes underlying biodegradation.
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Affiliation(s)
- Ameesha Shetty
- O.N. Allen Laboratory for Soil Microbiology, Department of Soil Science, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - William J. Hickey
- O.N. Allen Laboratory for Soil Microbiology, Department of Soil Science, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- * E-mail:
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Li G, Xu Y, Wang X, Zhang B, Shi C, Zhang W, Xia X. Tannin-rich fraction from pomegranate rind damages membrane of Listeria monocytogenes. Foodborne Pathog Dis 2014; 11:313-9. [PMID: 24447173 DOI: 10.1089/fpd.2013.1675] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Pomegranate rind has been reported to inhibit several foodborne pathogens, and its antimicrobial activity has been attributed mainly to its tannin fraction. This study aimed to investigate the antimicrobial activity of the tannin-rich fraction from pomegranate rind (TFPR) against Listeria monocytogenes and its mechanism of action. The tannin-related components of TFPR were analyzed by high-performance liquid chromatography and liquid chromatography-mass spectrometry, and the minimum inhibitory concentration (MIC) of TFPR was determined using the agar dilution method. Extracellular potassium concentration, the release of cell constituents, intra- and extracellular ATP concentrations, membrane potential, and intracellular pH (pHin) were measured to elucidate a possible antibacterial mechanism. Punicalagin (64.2%, g/g) and ellagic acid (3.1%, g/g) were detected in TFPR, and the MICs of TFPR were determined to be 1.25-5.0 mg/mL for different L. monocytogenes strains. Treatment with TFPR induced a decrease of the intracellular ATP concentration, an increase of the extracellular concentrations of potassium and ATP, and the release of cell constituents. A reduction of pHin and cell membrane hyperpolarization were observed after treatment. Electron microscopic observations showed that the cell membrane structures of L. monocytogenes were apparently impaired by TFPR. It is concluded that TFPR could destroy the integrity of the cell membrane of L. monocytogenes, leading to a loss of cell homeostasis. These findings indicate that TFPR has the potential to be used as a food preservative in order to control L. monocytogenes contamination in food and reduce the risk of listeriosis.
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Affiliation(s)
- Guanghui Li
- College of Food Science and Engineering, Northwest A&F University , Yangling, Shaanxi, China
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20
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Trans-membrane transport of n-octadecane by Pseudomonas sp. DG17. J Microbiol 2013; 51:791-9. [PMID: 24385357 DOI: 10.1007/s12275-013-3259-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 07/29/2013] [Indexed: 10/25/2022]
Abstract
The trans-membrane transport of hydrocarbons is an important and complex aspect of the process of biodegradation of hydrocarbons by microorganisms. The mechanism of transport of (14)C n-octadecane by Pseudomonas sp. DG17, an alkane-degrading bacterium, was studied by the addition of ATP inhibitors and different substrate concentrations. When the concentration of n-octadecane was higher than 4.54 μmol/L, the transport of (14)C n-octadecane was driven by a facilitated passive mechanism following the intra/extra substrate concentration gradient. However, when the cells were grown with a low concentration of the substrate, the cellular accumulation of n-octadecane, an energy-dependent process, was dramatically decreased by the presence of ATP inhibitors, and n-octadecane accumulation continually increased against its concentration gradient. Furthermore, the presence of non-labeled alkanes blocked (14)C n-octadecane transport only in the induced cells, and the trans-membrane transport of n-octadecane was specific with an apparent dissociation constant K t of 11.27 μmol/L and V max of 0.96 μmol/min/mg protein. The results indicated that the trans-membrane transport of n-octadecane by Pseudomonas sp. DG17 was related to the substrate concentration and ATP.
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21
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Li G, Wang X, Xu Y, Zhang B, Xia X. Antimicrobial effect and mode of action of chlorogenic acid on Staphylococcus aureus. Eur Food Res Technol 2013. [DOI: 10.1007/s00217-013-2140-5] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Sánchez E, Heredia N, Camacho-Corona MDR, García S. Isolation, characterization and mode of antimicrobial action against Vibrio cholerae
of methyl gallate isolated from Acacia farnesiana. J Appl Microbiol 2013; 115:1307-16. [DOI: 10.1111/jam.12328] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Revised: 08/05/2013] [Accepted: 08/12/2013] [Indexed: 11/29/2022]
Affiliation(s)
- E. Sánchez
- Departamento de Microbiología e Inmunología; Facultad de Ciencias Biológicas; Universidad Autónoma de Nuevo León; San Nicolás de los Garza NL México
| | - N. Heredia
- Departamento de Microbiología e Inmunología; Facultad de Ciencias Biológicas; Universidad Autónoma de Nuevo León; San Nicolás de los Garza NL México
| | - M. del R. Camacho-Corona
- Facultad de Ciencias Químicas; Universidad Autónoma de Nuevo León; San Nicolás de los Garza NL México
| | - S. García
- Departamento de Microbiología e Inmunología; Facultad de Ciencias Biológicas; Universidad Autónoma de Nuevo León; San Nicolás de los Garza NL México
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Novel tripartite aromatic acid transporter essential for terephthalate uptake in Comamonas sp. strain E6. Appl Environ Microbiol 2013; 79:6148-55. [PMID: 23913423 DOI: 10.1128/aem.01600-13] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
It has been suggested that a novel type of aromatic acid transporter, which is similar to the tripartite tricarboxylate transporter (TTT), is involved in terephthalate (TPA) uptake by Comamonas sp. strain E6. This suggestion was based on the presence of the putative TPA-binding protein gene, tphC, in the TPA catabolic operon. The tphC gene is essential for growth on TPA and is similar to the genes encoding TTT-like substrate-binding proteins. Here we identified two sets of E6 genes, tctBA and tpiBA, which encode TTT-like cytoplasmic transmembrane proteins. Disruption of tctA showed no influence on TPA uptake but resulted in a complete loss of the uptake of citrate. This loss suggests that tctA is involved in citrate uptake. On the other hand, disruption of tpiA or tpiB demonstrated that both genes are essential for TPA uptake. Only when both tphC and tpiBA were introduced with the TPA catabolic genes into cells of a non-TPA-degrading Pseudomonas strain did the resting cells of the transformant acquire the ability to convert TPA. From all these results, it was concluded that the TPA uptake system consists of the TpiA-TpiB membrane components and TPA-binding TphC. Interestingly, not only was the tpiA mutant of E6 unable to grow on TPA or isophthalate, it also showed significant growth delays on o-phthalate and protocatechuate. These results suggested that the TpiA-TpiB membrane components are able to interact with multiple substrate-binding proteins. The tpiBA genes were constitutively transcribed as a single operon in E6 cells, whereas the transcription of tphC was positively regulated by TphR. TPA uptake by E6 cells was completely inhibited by a protonophore, carbonyl cyanide m-chlorophenyl hydrazone, indicating that the TPA uptake system requires a proton motive force.
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Hernández-Sánchez V, Lang E, Wittich RM. The Three-Species Consortium of Genetically Improved Strains Cupriavidus necator RW112, Burkholderia xenovorans RW118, and Pseudomonas pseudoalcaligenes RW120 Grows with Technical Polychlorobiphenyl, Aroclor 1242. Front Microbiol 2013; 4:90. [PMID: 23658554 PMCID: PMC3647243 DOI: 10.3389/fmicb.2013.00090] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2012] [Accepted: 03/08/2013] [Indexed: 12/03/2022] Open
Abstract
Burkholderia xenovorans LB400, Cupriavidus necator H850, and Pseudomonas pseudoalcaligenes KF707 are bacterial strains able to mineralize biphenyl and to co-oxidize many of its halogenated derivatives (PCBs). Only strain LB400 also mineralizes a few mono- and dichlorobiphenyls, due to the presence of a functioning chlorocatechol pathway. Here, we used a Tn5-based minitransposon shuttle system to chromosomically introduce genes tcbRCDEF, encoding the chlorocatechol pathway into KF707, and genes cbdABC encoding a 2-chlorobenzoate 1,2-dioxygenase into KF707 and LB400, as well as transposon Tn4653 from the TOL plasmid, providing genes xylXYZL, encoding a broad-range toluate (methylbenzoate) dioxygenase and its dihydrodiol dehydrogenase, to extend the range for the mineralization of halogenated benzoates in LB400 and in KF707 through co-oxidation of halobenzoates into chlorocatechols. The engineered derivatives of LB400 and KF707 thus gained the ability for the mineralization of all isomeric monochloro- and bromobenzoates of the so-called lower pathway which, consequently, also allowed the mineralization of all monochlorobiphenyls and a number of di- and trichlorobiphenyls, thus preventing the accumulation of halobenzoates and of catabolites thereof. LB400 and KF707 also grow with the two commercial PCB formulations, Aroclor 1221 and Aroclor 1232, as the sole carbon and energy sources, but not with higher halogenated PCB mixtures, similar to the already published strain RW112. Repeated exposition of the modified LB400 to short pulses of UV light, over a prolonged period of time, allowed the isolation of a derivative of LB400, termed RW118, capable of growth with Aroclor 1016 still containing only traces of biphenyl, and in co-culture with modified KF707 termed RW120, and modified H850 (RW112) with Aroclor 1242, the commercial mixture already void of biphenyl and monochlorobiphenyls.
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Affiliation(s)
- Verónica Hernández-Sánchez
- Department of Environmental Protection, Experimental Station of the Zaidín, Spanish High Council for Scientific Research Granada, Spain
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25
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Soria S, de Anda R, Flores N, Romero-Garcia S, Gosset G, Bolívar F, Báez-Viveros JL. New insights on transcriptional responses of genes involved in carbon central metabolism, respiration and fermentation to low ATP levels in Escherichia coli. J Basic Microbiol 2012; 53:365-80. [PMID: 22914992 DOI: 10.1002/jobm.201100525] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Accepted: 02/03/2012] [Indexed: 12/12/2022]
Abstract
Adenosine-5-triphosphate (ATP) plays a fundamental role in many cellular processes such as transport, central carbon metabolism, biosynthetic reactions, macromolecular synthesis, signal transduction and cellular division. In addition, the intracellular [ATP]/[ADP] ratio in Escherichia coli plays an important role in controlling the specific rates of growth (µ), glucose consumption (qGlc ) and oxygen uptake (qO2), as well as the transcriptome pattern in the cell, as was recently reported. In the current study, the energetic level (expressed as [ATP]/[ADP] ratio) was substantially reduced in E. coli strains by either over-expressing the F1 -ATPase activity (JMAGD(+)) or inactivating ATP synthase (JMat(-)). The physiological characterization of the wild-type JM101 strain and its derivative JMAGD(+) and JMatp(-) strains was conducted in bioreactors containing minimal medium with glucose. The inactivation of the atp operon and F1 -ATPase overexpression significantly diminished the energetic level and cAMP concentration in derivative strains. Relative transcription levels of 105 genes involved in glucose transport, glycolysis, tricarboxylic acid (TCA) cycle, fermentation, respiration, transcriptional regulators, transcription and genes involved in stress were determined by using qPCR. Interestingly, in the JMAGD(+) and JMatp(-) strains, having a reduced energetic level, many transcripts of glycolysis, TCA cycle and respiratory genes were down-regulated when compared to wild type JM101. The transcriptional responses, detected in the strains with reduced energetic level show down-regulation of genes involved in central carbon metabolism and respiration, these results are apposite to the observed trends of increased metabolic fluxes in glucose consumption, glycolysis, acetate synthesis, TCA cycle and respiration. Regulation mediated by CRP-cAMP complex may explain some observed transcriptional responses of TCA cycle genes, since cAMP concentration and crp transcript level were significant reduced in the JMatp(-) mutant. Therefore, the substantial reduction of [ATP]/[ADP] ratio had a relevant effect on the CRP-cAMP regulatory system (among other global regulators), which may trigger an extensive transcriptional response.
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Affiliation(s)
- Sandra Soria
- Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos (UAEM), Cuernavaca, Morelos, México
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Yao Y, Xiong J, Chen Y, Tang J, Ying H. Enhanced adenosine triphosphate production by Saccharomyces cerevisiae using an efficient energy regeneration system. KOREAN J CHEM ENG 2010. [DOI: 10.1007/s11814-010-0331-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Extracts of edible and medicinal plants damage membranes of Vibrio cholerae. Appl Environ Microbiol 2010; 76:6888-94. [PMID: 20802077 DOI: 10.1128/aem.03052-09] [Citation(s) in RCA: 159] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The use of natural compounds from plants can provide an alternative approach against food-borne pathogens. The mechanisms of action of most plant extracts with antimicrobial activity have been poorly studied. In this work, changes in membrane integrity, membrane potential, internal pH (pH(in)), and ATP synthesis were measured in Vibrio cholerae cells after exposure to extracts of edible and medicinal plants. A preliminary screen of methanolic, ethanolic, and aqueous extracts of medicinal and edible plants was performed. Minimal bactericidal concentrations (MBCs) were measured for extracts showing high antimicrobial activity. Our results indicate that methanolic extracts of basil (Ocimum basilicum L.), nopal cactus (Opuntia ficus-indica var. Villanueva L.), sweet acacia (Acacia farnesiana L.), and white sagebrush (Artemisia ludoviciana Nutt.) are the most active against V. cholera, with MBCs ranging from 0.5 to 3.0 mg/ml. Using four fluorogenic techniques, we studied the membrane integrity of V. cholerae cells after exposure to these four extracts. Extracts from these plants were able to disrupt the cell membranes of V. cholerae cells, causing increased membrane permeability, a clear decrease in cytoplasmic pH, cell membrane hyperpolarization, and a decrease in cellular ATP concentration in all strains tested. These four plant extracts could be studied as future alternatives to control V. cholerae contamination in foods and the diseases associated with this microorganism.
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3-Chlorobenzoate is taken up by a chromosomally encoded transport system in Cupriavidus necator JMP134. Microbiology (Reading) 2009; 155:2757-2765. [DOI: 10.1099/mic.0.029207-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cupriavidus necator JMP134(pJP4) is able to grow on 3-chlorobenzoate (3-CB), a model chloroaromatic pollutant. Catabolism of 3-CB is achieved via the expression of the chromosomally encoded benABCD genes and the tfd genes from plasmid pJP4. Since passive diffusion of benzoic acid derivatives at physiological pH is negligible, the uptake of this compound should be facilitated by a transport system. However, no transporter has so far been described to perform this function, and identification of chloroaromatic compound transporters has been limited. In this work, uptake experiments using 3-[ring-UL-14C]CB showed an inducible transport system in strain JMP134, whose expression is activated by 3-CB and benzoate. A similar level of 3-CB uptake was found for a mutant strain of JMP134, defective in chlorobenzoate degradation, indicating that metabolic drag is not an important component of the measured uptake rate. Competitive inhibitor assays showed that uptake of 3-CB was inhibited by benzoate and, to a lesser degree, by 3-CB and 3,5-dichlorobenzoate, but not by any of 12 other substituted benzoates tested. The expression of several gene candidates for this transport function was analysed by RT-PCR, including both permease-type and ABC-type ATP-dependent transporters. Induction of a chromosomally encoded putative permease transporter (benP gene) was found specifically in the presence of 3-CB or benzoate. A benP knockout mutant of strain JMP134 displayed an almost complete loss of 3-CB transport activity. This is to our knowledge the first report of a 3-CB transporter.
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Zhou J, Liu L, Shi Z, Du G, Chen J. ATP in current biotechnology: regulation, applications and perspectives. Biotechnol Adv 2008; 27:94-101. [PMID: 19026736 DOI: 10.1016/j.biotechadv.2008.10.005] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2008] [Revised: 08/13/2008] [Accepted: 10/14/2008] [Indexed: 11/25/2022]
Abstract
Adenosine tri-phosphate (ATP), the most important energy source for metabolic reactions and pathways, plays a vital role in the growth of industrial strain and the production of target metabolites. In this review, current advances in manipulating ATP in industrial strains, including altering NADH availability, and regulating NADH oxidation pathway, oxygen supply, proton gradient, the electron transfer chain activity and the F(0)F(1)-ATPase activity, are summarized and discussed. By applying these strategies, optimal product concentrations, yields and productivity in industrial biotechnology have been achieved. Furthermore, the mechanisms by which ATP extends the substrate utilization spectra and enhances the ability to challenge harsh environmental stress have been elucidated. Finally, three critical issues related to ATP manipulation have been addressed.
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Affiliation(s)
- Jingwen Zhou
- The Key Laboratory of Industrial Biotechnology, School of Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
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Qi Y, Zhao L, Olusheyi OZ, Tan X. Isolation and preliminary characterization of a 3-chlorobenzoate degrading bacteria. J Environ Sci (China) 2007; 19:332-337. [PMID: 17918596 DOI: 10.1016/s1001-0742(07)60054-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A study was conducted to compare the diversity of 2-, 3-, and 4-chlorobenzoate degraders in two pristine soils and one contaminated sewage sludge. These samples contained strikingly different populations of mono-chlorobenzoate degraders. Although fewer cultures were isolated in the uncontaminated soils than contaminated one, the ability of microbial populations to mineralize chlorobenzoate was widespread. The 3- and 4-chlorobenzoate degraders were more diverse than the 2-chlorobenzoate degraders. One of the strains isolated from the sewage sludge was obtained. Based on its phenotype, chemotaxonomic properties and 16S rRNA gene, the organism S-7 was classified as Rhodococcus erythropolis. The strain can grow at temperature from 4 to 37 degrees C. It can utilize several (halo)aromatic compounds. Moreover, strain S-7 can grow and use 3-chlorobenzoate as sole carbon source in a temperatures range of 10-30 degrees C with stoichiometric release of chloride ions. The psychrotolerant ability was significant for bioremediation in low temperature regions. Catechol and chlorocatechol 1,2-dioxygenase activities were present in cell free extracts of the strain, but no (chloro)catechol 2,3-dioxygenase activities was detected. Spectral conversion assays with extracts from R. erythropolis S-7 showed accumulation of a compound with a similar UV spectrum as chloro-cis,cis-muconate from 3-chlorobenzoate. On the basis of these results, we proposed that S-7 degraded 3-chlorobenzoate through the modified ortho-cleave pathway.
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Affiliation(s)
- Yun Qi
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
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Wittich RM, Wolff P. Growth of the genetically engineered strain Cupriavidus necator RW112 with chlorobenzoates and technical chlorobiphenyls. Microbiology (Reading) 2007; 153:186-95. [PMID: 17185547 DOI: 10.1099/mic.0.29096-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cupriavidus necator (formerly Ralstonia eutropha) strain H850 is known to grow on biphenyl, and to co-oxidize congeners of polychlorinated biphenyls (PCBs). Using a Tn5-based minitransposon shuttle system and the TOL plasmid, the rational construction of hybrids of H850 was achieved by subsequent introduction of three distinct elements carrying 11 catabolic loci from three other biodegrading bacteria into the parent strain, finally yielding C. necator RW112. The new genetic elements introduced into H850 and its derivatives were tcbRCDEF, which encode the catabolic enzymes needed for chlorocatechol biodegradation under the control of a transcriptional regulator, followed by cbdABC, encoding a 2-halobenzoate dioxygenase, and xylXYZ, encoding a broad-spectrum toluate dioxygenase. The expression of the introduced genes was demonstrated by measuring the corresponding enzymic activities. The engineered strain RW112 gained the ability to grow on all isomeric monochlorobenzoates and 3,5-dichlorobenzoate, all monochlorobiphenyls, and 3,5-dichloro-, 2,3'-dichloro- and 2,4'-dichlorobiphenyl, without accumulation of chlorobenzoates. It also grew and utilized two commercial PCB formulations, Aroclor 1221 and Aroclor 1232, as sole carbon and energy sources for growth. This is the first report on the aerobic growth of a genetically improved bacterial strain at the expense of technical Aroclor mixtures.
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Affiliation(s)
- Rolf-Michael Wittich
- Division of Microbiology, German Research Centre for Biotechnology, Braunschweig, Germany.
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