1
|
The role of PhoP/PhoQ system in regulating stress adaptation response in Escherichia coli O157:H7. Food Microbiol 2023; 112:104244. [PMID: 36906298 DOI: 10.1016/j.fm.2023.104244] [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: 10/24/2022] [Revised: 01/19/2023] [Accepted: 02/20/2023] [Indexed: 02/24/2023]
Abstract
The development of acid tolerance response (ATR) as a result of low pH in Escherichia coli O157:H7 (E. coli O157:H7) contaminating beef during processing is considered a major food safety concern. Thus, in order to explore the formation and molecular mechanisms of the tolerance response of E. coli O157:H7 in a simulated beef processing environment, the resistance of a wild-type (WT) strain and its corresponding ΔphoP mutant to acid, heat, and osmotic pressure was evaluated. Strains were pre-adapted under different conditions of pH (5.4 and 7.0), temperature (37 °C and 10 °C), and culture medium (meat extract and Luria-Bertani broth media). In addition, the expression of genes related to stress response and virulence was also investigated among WT and ΔphoP strains under the tested conditions. Pre-acid adaptation increased the resistance of E. coli O157:H7 to acid and heat treatment while resistance to osmotic pressure decreased. Moreover, acid adaptation in meat extract medium simulating slaughter environment increased ATR, whereas pre-adaptation at 10 °C reduced the ATR. Furthermore, it was shown that mildly acidic conditions (pH = 5.4) and the PhoP/PhoQ two-component system (TCS) acted synergistically to enhance acid and heat tolerance in E. coli O157:H7. Additionally, the expression of genes related to arginine and lysine metabolism, heat shock, and invasiveness was up-regulated, which revealed that the mechanism of acid resistance and cross-protection under mildly acidic conditions was mediated by the PhoP/PhoQ TCS. Both acid adaptation and phoP gene knockout reduced the relative expression of stx1 and stx2 genes which were considered as critical pathogenic factors. Collectively, the current findings indicated that ATR could occur in E. coli O157:H7 during beef processing. Thus, there is an increased food safety risk due to the persistence of tolerance response in the following processing conditions. The present study provides a more comprehensive basis for the effective application of hurdle technology in beef processing.
Collapse
|
2
|
Hadiya S, Ibrahem RA, Abd El-Baky RM, Elsabahy M, Aly SA. Nanosized Combined Antimicrobial Drugs Decreased Emergence of Resistance in Escherichia coli: A Future Promise. Microb Drug Resist 2022; 28:972-979. [DOI: 10.1089/mdr.2022.0095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Safy Hadiya
- Assiut International Center of Nanomedicine, Al-Rajhy Liver Hospital, Assiut University, Assiut, Egypt
| | - Reham A. Ibrahem
- Department of Microbiology and Immunology, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Rehab M. Abd El-Baky
- Department of Microbiology and Immunology, Faculty of Pharmacy, Minia University, Minia, Egypt
- Department of Microbiology and Immunology, Faculty of Pharmacy, Deraya University, Minia, Egypt
| | - Mahmoud Elsabahy
- School of Biotechnology and Science Academy, Badr University in Cairo, Badr City, Cairo, Egypt
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
| | - Sherine A. Aly
- Department of Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut, Egypt
| |
Collapse
|
3
|
Derakhshan S, Ahmadi S, Ahmadi E, Nasseri S, Aghaei A. Characterization of Escherichia coli isolated from urinary tract infection and association between virulence expression and antimicrobial susceptibility. BMC Microbiol 2022; 22:89. [PMID: 35387587 PMCID: PMC8985246 DOI: 10.1186/s12866-022-02506-0] [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: 01/19/2022] [Accepted: 03/29/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The capacity of antibiotics to modulate bacterial virulence has raised concerns over the appropriateness of antibiotic therapies, including when dosing strategies fall below sub-therapeutic levels. In this work, we investigated the ability of antibiotics to influence virulence in Escherichia coli isolated from urinary tract infection (UTI). RESULTS Out of 120 isolates, 32.5% carried pap, 21.7% carried hlyA, and 17.5% carried cnf. The predominant B2 phylogroup was significantly associated with the quinolone-resistant isolates. A significant association was seen between the presence of hlyA hemolysin and susceptibility to ceftriaxone and ciprofloxacin (P < 0.05). Sub-inhibitory concentrations of both antibiotics reduced the levels of hlyA expression and hemolysis in isolates treated with antibiotics compared to untreated isolates (P < 0.05). Growth rate assay showed that the decrease in hlyA expression was not an effect of decreased growth rate. CONCLUSION Our study indicated the inhibitory effect of ciprofloxacin and ceftriaxone on the level of hemolysis, suggesting that the sub-inhibitory concentrations of these antibiotics may affect the outcome of infections. Further studies, including animal models may elucidate the outcome of virulence modulation by these antibiotics in UTI pathogenesis.
Collapse
Affiliation(s)
- Safoura Derakhshan
- Lung Diseases and Allergy Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran. .,Department of Microbiology, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran.
| | - Sanaz Ahmadi
- Social Determinants of Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Erfan Ahmadi
- Student Research Committee, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Sherko Nasseri
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Abbas Aghaei
- Social Determinants of Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
| |
Collapse
|
4
|
Clemente-Carazo M, Leal JJ, Huertas JP, Garre A, Palop A, Periago PM. The Different Response to an Acid Shock of Two Salmonella Strains Marks Their Resistance to Thermal Treatments. Front Microbiol 2021; 12:691248. [PMID: 34616373 PMCID: PMC8488367 DOI: 10.3389/fmicb.2021.691248] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 08/18/2021] [Indexed: 11/13/2022] Open
Abstract
Microbial cells respond to sub-lethal stresses with several physiological changes to increase their chance of survival. These changes are of high relevance when combined treatments (hurdle technology) are applied during food production, as the cells surviving the first hurdle may have greater resistance to subsequent treatments than untreated cells. In this study, we analyzed if Salmonella develops increased resistance to thermal treatments after the application of an acid shock. We compared the heat resistance of acid-shocked (pH 4.5 achieved with citric acid) Salmonella cells with that of cells maintained at pH 7 (control cells). Thermal treatments were performed between 57.5 and 65°C. We observed a differential response between the two strains studied. Acid-shocked cells of Salmonella Senftenberg exhibited reduced heat resistance, e.g., for a treatment at 60.0°C and pH 7.0 the time required to reduce the population by 3 log cycles was lowered from 10.75 to 1.98min with respect to control cells. Salmonella Enteritidis showed a different response, with acid-shocked cells having similar resistance than untreated cells (the time required to reduce 3 log cycles at 60.0°C and pH 7.0 was 0.30min for control and 0.31min for acid-shock cells). Based on results by differential plating (with or without adding the maximum non-inhibitory concentration of NaCl to the recovery medium), we hypothesize that the differential response between strains can be associated to sub-lethal damage to the cell membrane of S. Senftenberg caused by the acid shock. These results provide evidence that different strains of the same species can respond differently to an acid shock and highlight the relevance of cross-resistances for microbial risk assessment.
Collapse
Affiliation(s)
- Marta Clemente-Carazo
- Departamento Ingeniería Agronómica, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Instituto de Biotecnología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Universidad Politécnica de Cartagena, Cartagena, Spain
| | - José-Juan Leal
- Departamento Ingeniería Agronómica, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Instituto de Biotecnología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Universidad Politécnica de Cartagena, Cartagena, Spain
| | - Juan-Pablo Huertas
- Departamento Ingeniería Agronómica, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Instituto de Biotecnología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Universidad Politécnica de Cartagena, Cartagena, Spain
| | - Alberto Garre
- Food Microbiology, Wageningen University & Research, Wageningen, Netherlands
| | - Alfredo Palop
- Departamento Ingeniería Agronómica, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Instituto de Biotecnología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Universidad Politécnica de Cartagena, Cartagena, Spain
| | - Paula M Periago
- Departamento Ingeniería Agronómica, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Instituto de Biotecnología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Universidad Politécnica de Cartagena, Cartagena, Spain
| |
Collapse
|
5
|
Yu L, Zhang S, Xu Y, Mi X, Xing T, Li J, Zhang L, Gao F, Jiang Y. Acid resistance of E. coli O157:H7 and O26:H11 exposure to lactic acid revealed by transcriptomic analysis. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2020.110352] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
6
|
Optimizing Suitable Conditions for the Removal of Ammonium Nitrogen by a Microbe Isolated from Chicken Manure. OPEN CHEM 2019. [DOI: 10.1515/chem-2019-0096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractStrain C was isolated from chicken manure, and its phenotypic characteristics were gram-stain negative, yellow-pigmented, aerobic bacterium, heterotrophic, non-motile, chemoorganotrophic, non-gliding as well as non-spore-forming. A 16S rRNA gene sequence analysis showed that strain C occupied a distinct lineage within the family of the genus Chryseobacterium, and it shared highest sequence similarity with Chryseobacterium solincola strain 1YB-R12 (80%). The new isolate has been studied for removing ammonium-nitrogen (NH4-N) and the optimization of suitable conditions. The strain C was able to degrade over 42.8% of NH4-N during its active growth cycle. Experimental study of the effect of temperature and pH on NH4-N removal showed that the temperature and pH optima for NH4-N removal were 30–35℃ and 4–8, respectively. The results indicated that strain C shows a potential application for wastewater treatment.
Collapse
|
7
|
Yang J, Tang CB, Xiao J, Du WF, Li R. Influences of epigallocatechin gallate and citric acid on Escherichia coli O157:H7 toxin gene expression and virulence-associated stress response. Lett Appl Microbiol 2018; 67:435-441. [PMID: 30066955 DOI: 10.1111/lam.13058] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 07/29/2018] [Accepted: 07/30/2018] [Indexed: 01/22/2023]
Abstract
Citric acid and EGCG at their minimum inhibitory concentrations were tested in this study. Logarithmic phase cells of Escherichia coli O157:H7 (ATCC 43895) were exposed to EGCG and citric acid respectively. The results of RT-real time PCR showed that both EGCG and citric acid increased stx2 and oxyR expression and decreased stx1, recA and Q expression. The result of Western blotting for RecA protein further indicated that both EGCG and citric acid decreased RecA production. Both EGCG and citric acid increased the level of intracellular reactive oxygen species and H2 O2 production and decreased superoxide dismutase activity. Therefore, EGCG and citric acid might induce stx2 production by increasing oxidative stress response and inhibit stx1 production by suppressing SOS response. In our study, the differential effects of the two antimicrobials were observed. EGCG reduced ompC and rpoS expression. However, citric acid caused an increase in ompC and rpoS expression. Membrane permeability is associated with toxin release. Citric acid increased the outer membrane permeability of E. coli O157:H7. However, the outer membrane of E. coli O157:H7 remained unaffected by EGCG. SIGNIFICANCE AND IMPACT OF THE STUDY Shiga toxins are the major virulence factors of Escherichia coli O157:H7. The use of antimicrobials triggering Shiga toxin production is controversial. (-)-epigallocatechin-3-gallate (EGCG) citric acid are often used singly or in combination to prevent micro-organisms in some food products. This study evaluated toxin induction in E. coli O157:H7 in response to EGCG and citric acid and investigated the potential mechanism of action. The findings may contribute to the proper use of EGCG and citric acid as antimicrobials.
Collapse
Affiliation(s)
- J Yang
- College of Biological and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan, China
| | - C B Tang
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - J Xiao
- College of Biological and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan, China
| | - W F Du
- College of Biological and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan, China
| | - R Li
- College of Biological and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan, China
| |
Collapse
|
8
|
Synergistic Effect of the Lactoperoxidase System and Cinnamon Essential Oil on Total Flora andSalmonellaGrowth Inhibition in Raw Milk. J FOOD QUALITY 2018. [DOI: 10.1155/2018/8547954] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Despite its antibacterial and antipathogenic effects, the heat treatment of milk induces undesirable changes that can be noted in the overall properties of ultrahigh temperature (UHT) milk, such as changes in nutritional and organoleptic properties. Our goal is to find new nonthermal antibacterial technologies for the preservation of raw milk (RM). This study investigates the possible synergistic effect of using a combination of the lactoperoxidase system (LS) and 3 μg mL−1of cinnamon essential oil (cinnamon EO) to inactivate the total flora of milk andSalmonellaHadar (S. Hadar). The LS was activated with 30 mg L−1sodium percarbonate and 14 mg L−1of sodium thiocyanate. Using this approach, we obtained a synergistic effect with a complete inhibition of the activity of the total flora of the milk andS.Hadar after 12 hours at 25°C. In addition, the attainment of synergy was defined when the inhibitory effect of the two compounds together was greater than the effect observed by each compound added alone. Moreover, the monitoring of the synergistic effect at 4°C for 5 days showed complete inhibition of total flora for 3 days and forS. Hadar it was up to 5 days. To summarize, the current study clearly identified a new inhibitory combination that may be used in food-based applications.
Collapse
|
9
|
Silva F, Domingues FC. Antimicrobial activity of coriander oil and its effectiveness as food preservative. Crit Rev Food Sci Nutr 2017; 57:35-47. [PMID: 25831119 DOI: 10.1080/10408398.2013.847818] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
ABTRACT Foodborne illness represents a major economic burden worldwide and a serious public health threat, with around 48 million people affected and 3,000 death each year only in the USA. One of the possible strategies to reduce foodborne infections is the development of effective preservation strategies capable of eradicating microbial contamination of foods. Over the last years, new challenges for the food industry have arisen such as the increase of antimicrobial resistance of foodborne pathogens to common preservatives and consumers demand for naturally based products. In order to overcome this, new approaches using natural or bio-based products as food preservatives need to be investigated. Coriander (Coriandrum sativum L.) is a well-known herb widely used as spice, or in folk medicine, and in the pharmacy and food industries. Coriander seed oil is the world's second most relevant essential oil, exhibiting antimicrobial activity against Gram-positive and Gram-negative bacteria, some yeasts, dermatophytes and filamentous fungi. This review highlights coriander oil antimicrobial activity and possible mechanisms of action in microbial cells and discusses the ability of coriander oil usage as a food preservative, pointing out possible paths for the successful evolution for these strategies towards a successful development of a food preservation strategy using coriander oil.
Collapse
Affiliation(s)
- Filomena Silva
- a CICS-UBI-Health Sciences Research Centre, University of Beira Interior , Avenida Infante D. Henrique, Covilhã , Portugal
| | - Fernanda C Domingues
- a CICS-UBI-Health Sciences Research Centre, University of Beira Interior , Avenida Infante D. Henrique, Covilhã , Portugal
| |
Collapse
|
10
|
Haberbeck LU, Wang X, Michiels C, Devlieghere F, Uyttendaele M, Geeraerd AH. Cross-protection between controlled acid-adaptation and thermal inactivation for 48 Escherichia coli strains. Int J Food Microbiol 2017; 241:206-214. [DOI: 10.1016/j.ijfoodmicro.2016.10.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 09/02/2016] [Accepted: 10/08/2016] [Indexed: 11/26/2022]
|
11
|
Kim GH, Fratamico P, Breidt F, Oh DH. Survival and expression of acid resistance genes in Shiga toxin-producing Escherichia coli
acid adapted in pineapple juice and exposed to synthetic gastric fluid. J Appl Microbiol 2016; 121:1416-1426. [DOI: 10.1111/jam.13223] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 06/24/2016] [Accepted: 06/30/2016] [Indexed: 01/19/2023]
Affiliation(s)
- G.-H. Kim
- Department of Food Science and Biotechnology; Kangwon National University; Chuncheon Gangwon South Korea
- USDA-ARS Eastern Regional Research Center; Wyndmoor PA USA
| | - P. Fratamico
- USDA-ARS Eastern Regional Research Center; Wyndmoor PA USA
| | - F. Breidt
- USDA-ARS Food Science Research Unit; Department of Food; Bioprocessing and Nutrition Sciences; North Carolina State University; Raleigh NC USA
| | - D.-H. Oh
- Department of Food Science and Biotechnology; Kangwon National University; Chuncheon Gangwon South Korea
| |
Collapse
|
12
|
Lee H, Lee S, Kim S, Ha J, Lee J, Choi KH, Yoon Y. NaCl Influences Thermal Resistance and Cell Morphology of Escherichia coli
Strains. J Food Saf 2015. [DOI: 10.1111/jfs.12213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Heeyoung Lee
- Department of Food and Nutrition; Sookmyung Women's University; Seoul 140-742 Korea
| | - Soomin Lee
- Department of Food and Nutrition; Sookmyung Women's University; Seoul 140-742 Korea
| | - Sejeong Kim
- Department of Food and Nutrition; Sookmyung Women's University; Seoul 140-742 Korea
| | - Jimyeong Ha
- Department of Food and Nutrition; Sookmyung Women's University; Seoul 140-742 Korea
| | - Jeeyeon Lee
- Department of Food and Nutrition; Sookmyung Women's University; Seoul 140-742 Korea
| | - Kyoung-Hee Choi
- Department of Oral Microbiology; College of Dentistry; Wonkwang University; Jeonbuk Korea
| | - Yohan Yoon
- Department of Food and Nutrition; Sookmyung Women's University; Seoul 140-742 Korea
| |
Collapse
|
13
|
Li T, Deng X, Wang J, Chen Y, He L, Sun Y, Song C, Zhou Z. Biodegradation of nitrobenzene in a lysogeny broth medium by a novel halophilic bacterium Bacillus licheniformis. MARINE POLLUTION BULLETIN 2014; 89:384-389. [PMID: 25440194 DOI: 10.1016/j.marpolbul.2014.09.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 09/15/2014] [Accepted: 09/17/2014] [Indexed: 06/04/2023]
Abstract
The Bacillus licheniformis strain YX2, a novel nitrobenzene-degrading halophilic bacterium, was isolated from active sludge obtained from a pesticide factory. Strain YX2 can withstand highly acidic and alkaline conditions and high temperatures. Degradation of nitrobenzene (200mgL(-1)) by YX2 exceeded 70% after 72h in lysogeny broth medium (pH 4-9). Under optimal degradation conditions (33°C, pH 7 in LB medium) YX2 degraded 50, 100, 200, and 600mgL(-1) nitrobenzene within 36, 36, 72, and 156h, respectively. Even in the presence of benzene, phenol or aniline, strain YX2 efficiently degraded nitrobenzene. Furthermore, strain YX2 completely degraded 600mgL(-1) nitrobenzene in 7% NaCl (w/w). Thus, our data show that strain YX2 may have promise for removing nitrobenzene from complex wastewaters with high salinity and variable pH.
Collapse
Affiliation(s)
- Tian Li
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Xinping Deng
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Jinjun Wang
- College of Plant Protection, Southwest University, Chongqing 400715, PR China.
| | - Yucheng Chen
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Lin He
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Yuchuan Sun
- School of Geography Sciences, Southwest University, Chongqing 400715, PR China
| | - Caixia Song
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Zhifeng Zhou
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| |
Collapse
|
14
|
Fusco V, Quero GM. Culture-Dependent and Culture-Independent Nucleic-Acid-Based Methods Used in the Microbial Safety Assessment of Milk and Dairy Products. Compr Rev Food Sci Food Saf 2014; 13:493-537. [DOI: 10.1111/1541-4337.12074] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 03/08/2014] [Indexed: 12/12/2022]
Affiliation(s)
- Vincenzina Fusco
- Nal. Research Council of Italy; Inst. of Sciences of Food Production (CNR-ISPA); Bari Italy
| | - Grazia Marina Quero
- Nal. Research Council of Italy; Inst. of Sciences of Food Production (CNR-ISPA); Bari Italy
| |
Collapse
|
15
|
Jin J, Zhang B, Guo H, Cui J, Jiang L, Song S, Sun M, Ren F. Mechanism analysis of acid tolerance response of bifidobacterium longum subsp. longum BBMN 68 by gene expression profile using RNA-sequencing. PLoS One 2012; 7:e50777. [PMID: 23236393 PMCID: PMC3517610 DOI: 10.1371/journal.pone.0050777] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 10/24/2012] [Indexed: 12/17/2022] Open
Abstract
To analyze the mechanism of the acid tolerance response (ATR) in Bifidobacterium longum subsp. longum BBMN68, we optimized the acid-adaptation condition to stimulate ATR effectively and analyzed the change of gene expression profile after acid-adaptation using high-throughput RNA-Seq. After acid-adaptation at pH 4.5 for 2 hours, the survival rate of BBMN68 at lethal pH 3.5 for 120 min was increased by 70 fold and the expression of 293 genes were upregulated by more than 2 fold, and 245 genes were downregulated by more than 2 fold. Gene expression profiling of ATR in BBMN68 suggested that, when the bacteria faced acid stress, the cells strengthened the integrity of cell wall and changed the permeability of membrane to keep the H+ from entering. Once the H+ entered the cytoplasm, the cells showed four main responses: First, the F0F1-ATPase system was initiated to discharge H+. Second, the ability to produce NH3 by cysteine-cystathionine-cycle was strengthened to neutralize excess H+. Third, the cells started NER-UVR and NER-VSR systems to minimize the damage to DNA and upregulated HtpX, IbpA, and γ-glutamylcysteine production to protect proteins against damage. Fourth, the cells initiated global response signals ((p)ppGpp, polyP, and Sec-SRP) to bring the whole cell into a state of response to the stress. The cells also secreted the quorum sensing signal (AI-2) to communicate between intraspecies cells by the cellular signal system, such as two-component systems, to improve the overall survival rate. Besides, the cells varied the pathways of producing energy by shifting to BCAA metabolism and enhanced the ability to utilize sugar to supply sufficient energy for the operation of the mechanism mentioned above. Based on these reults, it was inferred that, during industrial applications, the acid resistance of bifidobacteria could be improved by adding BCAA, γ-glutamylcysteine, cysteine, and cystathionine into the acid-stress environment.
Collapse
Affiliation(s)
- Junhua Jin
- Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Bing Zhang
- Core Genomic Facility, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Huiyuan Guo
- Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- Beijing Higher Institution Engineering Research Center of Animal Product, Beijing, China
| | - Jianyun Cui
- Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Lu Jiang
- Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- Beijing Key Laboratory of Nutrition, Health and Food Safety, Beijing, China
| | - Shuhui Song
- Core Genomic Facility, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Min Sun
- Core Genomic Facility, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Fazheng Ren
- Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- Beijing Key Laboratory of Nutrition, Health and Food Safety, Beijing, China
- * E-mail:
| |
Collapse
|