1
|
Magnan C, Lancry T, Salipante F, Trusson R, Dunyach-Remy C, Roger C, Lefrant JY, Massanet P, Lavigne JP. Role of gut microbiota and bacterial translocation in acute intestinal injury and mortality in patients admitted in ICU for septic shock. Front Cell Infect Microbiol 2023; 13:1330900. [PMID: 38179421 PMCID: PMC10765587 DOI: 10.3389/fcimb.2023.1330900] [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: 10/31/2023] [Accepted: 12/01/2023] [Indexed: 01/06/2024] Open
Abstract
Introduction Sepsis is a life-threatening organ dysfunction with high mortality rate. The gut origin hypothesis of multiple organ dysfunction syndrome relates to loss of gut barrier function and the ensuing bacterial translocation. The aim of this study was to describe the evolution of gut microbiota in a cohort of septic shock patients over seven days and the potential link between gut microbiota and bacterial translocation. Methods Sixty consecutive adult patients hospitalized for septic shock in intensive care units (ICU) were prospectively enrolled. Non-inclusion criteria included patients with recent or scheduled digestive surgery, having taken laxatives, pre- or probiotic in the previous seven days, a progressive digestive neoplasia, digestive lymphoma, chronic inflammatory bowel disease, moribund patient, and pregnant and lactating patients. The primary objective was to evaluate the evolution of bacterial diversity and richness of gut microbiota during seven days in septic shock. Epidemiological, clinical and biological data were gathered over seven days. Gut microbiota was analyzed through a metagenomic approach. 100 healthy controls were selected among healthy blood donors for reference basal 16S rDNA values. Results Significantly lower bacterial diversity and richness was observed in gut microbiota of patients at Day 7 compared with Day 0 (p<0.01). SOFA score at Day 0, Acute Gastrointestinal Injury (AGI) local grade, septic shock origin and bacterial translocation had an impact on alpha diversity. A large increase in Enterococcus genus was observed at Day 7 with a decrease in Enterobacterales, Clostridiales, Bifidobacterium and other butyrate-producing bacteria. Discussion This study shows the importance of bacterial translocation during AGI in septic shock patients. This bacterial translocation decreases during hospitalization in ICUs in parallel to the decrease of microbiota diversity. This work highlights the role of gut microbiota and bacterial translocation during septic shock.
Collapse
Affiliation(s)
- Chloé Magnan
- Bacterial Virulence and Chronic Infection (VBIC), INSERM U1047, Univ Montpellier, Department of Microbiology and Hospital Hygiene, Platform MICRO&BIO, University Hospital Center (CHU) Nîmes, Nîmes, France
| | - Thomas Lancry
- UR-UM103 UMAGINE, Univ Montpellier, Division of Anesthesia Critical Care, Pain and Emergency Medicine, CHU Nîmes, Nîmes, France
| | - Florian Salipante
- Department of Biostastistics, Epidemiology, Public Health and Innovation in Methodology, Univ Montpellier, CHU Nîmes, Nîmes, France
| | - Rémi Trusson
- UR-UM103 UMAGINE, Univ Montpellier, Division of Anesthesia Critical Care, Pain and Emergency Medicine, CHU Nîmes, Nîmes, France
| | - Catherine Dunyach-Remy
- Bacterial Virulence and Chronic Infection (VBIC), INSERM U1047, Univ Montpellier, Department of Microbiology and Hospital Hygiene, Platform MICRO&BIO, University Hospital Center (CHU) Nîmes, Nîmes, France
| | - Claire Roger
- UR-UM103 UMAGINE, Univ Montpellier, Division of Anesthesia Critical Care, Pain and Emergency Medicine, CHU Nîmes, Nîmes, France
| | - Jean-Yves Lefrant
- UR-UM103 UMAGINE, Univ Montpellier, Division of Anesthesia Critical Care, Pain and Emergency Medicine, CHU Nîmes, Nîmes, France
| | - Pablo Massanet
- UR-UM103 UMAGINE, Univ Montpellier, Division of Anesthesia Critical Care, Pain and Emergency Medicine, CHU Nîmes, Nîmes, France
| | - Jean-Philippe Lavigne
- Bacterial Virulence and Chronic Infection (VBIC), INSERM U1047, Univ Montpellier, Department of Microbiology and Hospital Hygiene, Platform MICRO&BIO, University Hospital Center (CHU) Nîmes, Nîmes, France
| |
Collapse
|
2
|
Antimicrobial resistance of Enterococcus species isolated from wild mammals in Aragón, Spain. J Vet Res 2022; 66:151-159. [PMID: 35892100 PMCID: PMC9281524 DOI: 10.2478/jvetres-2022-0020] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 04/04/2022] [Indexed: 11/20/2022] Open
Abstract
Abstract
Introduction
Antimicrobial resistance is currently one of the major public health threats. In order to prevent its spread, the WHO, OIE and FAO have formed an alliance to promote the study of antibiotic resistance evolution in human, animal and environmental bacteria posing a public health threat; however, the studies performed in wild animals are scarce so far. The main objective of this study was to assess the antibiotic resistance of Enterococcus spp. isolated from wild mammals in Aragón, Spain.
Material and Methods
Rectal samples were collected from 103 wild mammals – 70 hunt prey and 33 rescued animals. Isolates were identified by matrix-assisted laser desorption/ionisation–time of flight mass spectrometry and susceptibility tests to 10 antibiotics were also carried out. Statistical analysis was performed (P ≤ 0.05).
Results
A total of 126 isolates of seven different Enterococcus species were recovered. Among them, E faecalis (37.60%), E. casseliflavus (20.63%) and E. faecium (17.46%) were the most prevalent. The antibiotics quinupristin-dalfopristin and ciprofloxacin most frequently lost efficacy against the isolates. Multi-drug resistance was more prevalent in enterococci isolated from the rescued mammals.
Conclusion
This study found resistance widely distributed among enterococci isolated from the studied mammals. This points to the need for additional study of its genetic determinants and investigation of the sources and measures to avoid contributory environmental contamination.
Collapse
|
3
|
Choeisoongnern T, Sirilun S, Waditee-Sirisattha R, Pintha K, Peerajan S, Chaiyasut C. Potential Probiotic Enterococcus faecium OV3-6 and Its Bioactive Peptide as Alternative Bio-Preservation. Foods 2021; 10:foods10102264. [PMID: 34681312 PMCID: PMC8534580 DOI: 10.3390/foods10102264] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/09/2021] [Accepted: 09/18/2021] [Indexed: 02/07/2023] Open
Abstract
Probiotic Enterococcus faecium OV3-6 and its secreted active peptide were characterized and investigated. The strain survived in simulated gastric and small intestinal conditions at 88.16% and 94.33%, respectively. The safety assessment revealed that the strain was shown α-hemolysis and susceptible to most clinically relevant antibiotics, but intermediate sensitivity to erythromycin and kanamycin was found. It does not harbor any virulence genes except for the efaAfm gene. Both of its living cells and the cell-free supernatants (CFS) of the strain significantly reduced the adhesion of E. coli and S. Typhi on Caco-2 cells. The strain can regulate the secretion of pro and inflammatory cytokines, IL-6 and IL-12 and induce the secretion of anti-inflammatory IL-10 of the Caco-2 cell. The strain can prevent the growth of Gram-positive strains belonging to the genera Bacillus, Carnobacterium, Listeria, and Staphylococcus. It also presented the entP gene that involves the production of bacteriocin named enterocin P. The antimicrobial peptide was matched 40% with 50S ribosomal proteins L29 (7.325 kDa), as revealed by LC-MS/MS. This active peptide exhibits heat stability, is stable over a wide pH range of 2−10, and maintains its activity at −20 and 4 °C for 12 weeks of storage. Altogether, E. faecium OV3-6 thus has potential for consideration as a probiotic and bio-preservative for applied use as a fermented food starter culture and in functional food or feed industries.
Collapse
Affiliation(s)
- Thiwanya Choeisoongnern
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand;
- Innovation Center for Holistic Health, Nutraceuticals, and Cosmeceuticals, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Sasithorn Sirilun
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand;
- Correspondence: (S.S.); (C.C.); Tel.: +66-5394-4375 (S.S.); +66-5394-4340 (C.C.)
| | | | - Komsak Pintha
- Division of Biochemistry, School of Medical Sciences, University of Phayao, Phayao 56000, Thailand;
| | | | - Chaiyavat Chaiyasut
- Innovation Center for Holistic Health, Nutraceuticals, and Cosmeceuticals, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand
- Correspondence: (S.S.); (C.C.); Tel.: +66-5394-4375 (S.S.); +66-5394-4340 (C.C.)
| |
Collapse
|
4
|
Lengliz S, Abbassi MS, Rehaiem A, Ben Chehida N, Najar T. Characterization of bacteriocinogenic Enterococcus isolates from wild and laboratory rabbits for the selection of autochthonous probiotic strains in Tunisia. J Appl Microbiol 2021; 131:1474-1486. [PMID: 33629433 DOI: 10.1111/jam.15047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 01/06/2021] [Accepted: 02/22/2021] [Indexed: 01/22/2023]
Abstract
AIM The objective of this study was to characterize lactic acid bacteria (LAB) from rabbits to be used as potential autochthonous probiotic. METHODS AND RESULTS Fifteen faecal samples were collected from wild and laboratory rabbits. One hundred and eight isolates were collected and tested for their inhibitory power against eight pathogenic bacteria. Among them, 43 Enterococcus isolates were able to inhibit at least one pathogen. Enterocine genes entA, entB and entP were detected in 14, 17 and 22 isolates, respectively. These isolates were tested for their antibiotic susceptibility and genes encoding virulence factors. Relevant phenotypes of antibiotic resistance were observed especially for ampicillin, vancomycin and linezolid. The following virulence genes were detected (number of positive isolates): hyl (5), esp (8), gelE (30), agg (2), ace (21), efa (6), CylLL/s (5), cob (26), cpd (32) and ccf (33). Five isolates were considered as safe and showed tolerance to both acid and bile salt. CONCLUSION Bacteriocinogenic enterococci isolates from rabbits may show relevant resistance phenotypes and virulence factors. In addition, one Enterococcus durans isolate presents promising autochthonous probiotic candidate. SIGNIFICANCE AND IMPACT OF THE STUDY This study reveals interesting properties for E. durans isolate and supports their utilization as autochthonous probiotic in rabbit husbandry.
Collapse
Affiliation(s)
- S Lengliz
- Laboratory of Materials, Molecules and Application, Preparatory Institute for Scientific and Technical Studies LR11ES22, University of Carthage, Tunis, Tunisia.,Institute of Veterinary Research of Tunisia, University of Tunis El Manar, Tunis, Tunisia
| | - M S Abbassi
- Institute of Veterinary Research of Tunisia, University of Tunis El Manar, Tunis, Tunisia.,Faculty of Medecine of Tunis, Research Laboratory "Antimicrobial Resistance" LR99ES09, University of Tunis El Manar, Tunis, Tunisia
| | - A Rehaiem
- Faculty of Medecine of Tunis, Research Laboratory "Antimicrobial Resistance" LR99ES09, University of Tunis El Manar, Tunis, Tunisia.,Laboratory of Microbiology, Charles Nicolle Hospital, Tunis, Tunisia
| | - N Ben Chehida
- Institute of Veterinary Research of Tunisia, University of Tunis El Manar, Tunis, Tunisia
| | - T Najar
- Laboratory of Materials, Molecules and Application, Preparatory Institute for Scientific and Technical Studies LR11ES22, University of Carthage, Tunis, Tunisia.,Department of Animal Sciences, National Institute of Agronomy of Tunisia, University of Carthage, Tunis, Tunisia
| |
Collapse
|
5
|
Liu W, Cheng M, Li J, Zhang P, Fan H, Hu Q, Han M, Su L, He H, Tong Y, Ning K, Long Y. Classification of the Gut Microbiota of Patients in Intensive Care Units During Development of Sepsis and Septic Shock. GENOMICS PROTEOMICS & BIOINFORMATICS 2021; 18:696-707. [PMID: 33607294 PMCID: PMC8377022 DOI: 10.1016/j.gpb.2020.06.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 08/21/2020] [Indexed: 12/11/2022]
Abstract
The gut microbiota of intensive care unit (ICU) patients displays extreme dysbiosis associated with increased susceptibility to organ failure, sepsis, and septic shock. However, such dysbiosis is difficult to characterize owing to the high dimensional complexity of the gut microbiota. We tested whether the concept of enterotype can be applied to the gut microbiota of ICU patients to describe the dysbiosis. We collected 131 fecal samples from 64 ICU patients diagnosed with sepsis or septic shock and performed 16S rRNA gene sequencing to dissect their gut microbiota compositions. During the development of sepsis or septic shock and during various medical treatments, the ICU patients always exhibited two dysbiotic microbiota patterns, or ICU-enterotypes, which could not be explained by host properties such as age, sex, and body mass index, or external stressors such as infection site and antibiotic use. ICU-enterotype I (ICU E1) comprised predominantly Bacteroides and an unclassified genus of Enterobacteriaceae, while ICU-enterotype II (ICU E2) comprised predominantly Enterococcus. Among more critically ill patients with Acute Physiology and Chronic Health Evaluation II (APACHE II) scores > 18, septic shock was more likely to occur with ICU E1 (P = 0.041). Additionally, ICU E1 was correlated with high serum lactate levels (P = 0.007). Therefore, different patterns of dysbiosis were correlated with different clinical outcomes, suggesting that ICU-enterotypes should be diagnosed as independent clinical indices. Thus, the microbial-based human index classifier we propose is precise and effective for timely monitoring of ICU-enterotypes of individual patients. This work is a first step toward precision medicine for septic patients based on their gut microbiota profiles.
Collapse
Affiliation(s)
- Wanglin Liu
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Beijing 100730, China
| | - Mingyue Cheng
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jinman Li
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China
| | - Peng Zhang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hang Fan
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China
| | - Qinghe Hu
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Beijing 100730, China
| | - Maozhen Han
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Longxiang Su
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Beijing 100730, China
| | - Huaiwu He
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Beijing 100730, China
| | - Yigang Tong
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering (BAIC-SM), College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Kang Ning
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Yun Long
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Beijing 100730, China.
| |
Collapse
|
6
|
Mahdi LH, Nazem Abdul-Hur G, Auda IG. Evidence of anti- K. pneumoniae biofilm activity of novel Entrococcus faecalis enterocin GLHM. Microb Pathog 2020; 147:104366. [DOI: 10.1016/j.micpath.2020.104366] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/25/2020] [Accepted: 06/25/2020] [Indexed: 02/06/2023]
|
7
|
Nami Y, Vaseghi Bakhshayesh R, Mohammadzadeh Jalaly H, Lotfi H, Eslami S, Hejazi MA. Probiotic Properties of Enterococcus Isolated From Artisanal Dairy Products. Front Microbiol 2019; 10:300. [PMID: 30863379 PMCID: PMC6400110 DOI: 10.3389/fmicb.2019.00300] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 02/04/2019] [Indexed: 12/11/2022] Open
Abstract
The present study focused on probiotic characterization and safety evaluation of Enterococcus isolates from different artisanal dairy products. All the isolates exhibited inhibitory activity against several food spoilage bacteria and food-borne pathogens, including Shigella flexneri, Staphylococcus aureus, Listeria monocytogenes, Yersinia enterocolitica, Klebsiella pneumoniae, Escherichia coli, and Bacillus subtilis. The PCR results indicated the presence of at least one enterocin structural gene in all the tested strains. The Enterococcus isolates were further evaluated regarding their safety properties and functional features. The isolates were susceptible to vancomycin, gentamycin, and chloramphenicol. The results of PCR amplification revealed that all the tested isolates harbored none of the tested virulence genes except E. faecalis (ES9), which showed the presence of esp gene. The Enterococcus isolates showed cholesterol lowering properties. The selected isolates showed a high tolerance to low pH, and toward bile salts. They also demonstrated hydrophobicity activity, auto-aggregation, and adhesion ability to the human intestinal Caco-2 cell line. These properties may contribute the bacteria colonizing the gut. This study revealed that the Enterococcus isolates, especially E. durans ES11, ES20 and ES32, might be excellent candidates for production of functional foods to promote health benefits.
Collapse
Affiliation(s)
- Yousef Nami
- Department of Food Biotechnology, Branch for Northwest and West Region, Agricultural Biotechnology Research Institute, Education and Extension Organization (AREEO), Tabriz, Iran
| | - Reza Vaseghi Bakhshayesh
- Department of Food Biotechnology, Branch for Northwest and West Region, Agricultural Biotechnology Research Institute, Education and Extension Organization (AREEO), Tabriz, Iran
| | - Hossein Mohammadzadeh Jalaly
- Department of Food Biotechnology, Branch for Northwest and West Region, Agricultural Biotechnology Research Institute, Education and Extension Organization (AREEO), Tabriz, Iran
| | - Hajie Lotfi
- Department of Food Biotechnology, Branch for Northwest and West Region, Agricultural Biotechnology Research Institute, Education and Extension Organization (AREEO), Tabriz, Iran
| | - Solat Eslami
- Department of Food Biotechnology, Branch for Northwest and West Region, Agricultural Biotechnology Research Institute, Education and Extension Organization (AREEO), Tabriz, Iran
- Dietary Supplements and Probiotic Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Mohammad Amin Hejazi
- Department of Food Biotechnology, Branch for Northwest and West Region, Agricultural Biotechnology Research Institute, Education and Extension Organization (AREEO), Tabriz, Iran
| |
Collapse
|
8
|
Screening of the Enterocin-Encoding Genes and Their Genetic Determinism in the Bacteriocinogenic Enterococcus faecium GHB21. Probiotics Antimicrob Proteins 2018; 11:325-331. [PMID: 30027472 DOI: 10.1007/s12602-018-9448-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Enterococci are well-known for their ability to produce a variety of antimicrobial peptides called enterocins. Most of these enterocins withstand extreme conditions and are very effective against a broad spectrum of undesirable bacteria including some Gram-negative bacteria. The same enterococci strain can produce multiple enterocins simultaneously. The genetic determinants of these bacteriocins can either be located on plasmids or on bacterial chromosome. Digestion of Enterococcus faecium GHB21 plasmids with various restriction endonucleases suggests the presence of two plasmids named pGHB-21.1 and pGHB-21.2 whose respective sizes are ~ 10.0 kb and ~ 3.3 kb. The screening of enterocin-encoding genes among E. faecium GHB21 genome by PCR followed by amplicon sequencing indicated the presence of three different enterocin structural genes similar to entA, entB, and entP genes previously detected in other E. faecium strains. These enterocin genes were, subsequently, localized on the bacterial chromosome based on PCR-targeted screening using total DNA and plasmids of E. faecium GHB21 as separate templates.
Collapse
|
9
|
Rahmeh R, Akbar A, Kishk M, Al Onaizi T, Al-Shatti A, Shajan A, Akbar B, Al-Mutairi S, Yateem A. Characterization of semipurified enterocins produced by Enterococcus faecium strains isolated from raw camel milk. J Dairy Sci 2018. [PMID: 29525307 DOI: 10.3168/jds.2017-13996] [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] [Indexed: 12/12/2022]
Abstract
Food safety has become an issue of great interest worldwide. Listeria monocytogenes is a food-borne pathogen that causes listeriosis and is difficult to control in the dairy industry. The use of lactic acid bacteria (LAB) and their antimicrobial substances against Listeria is promising in food applications. Here, we report the isolation from raw camel milk of LAB displaying antilisterial activity. Two isolates were selected for their secretion of bacteriocin(s) and identified by 16S rRNA sequencing as Enterococcus faecium S6 and R9. The produced bacteriocins were partially purified by ammonium sulfate precipitation and then biochemically characterized. Antimicrobial activity was estimated to be 6,400 and 400 AU (arbitrary units)/mL for E. faecium S6 and R9, respectively. The proteinaceous nature of the bacteriocins was confirmed via enzymatic reactions. Moreover, lipolytic and glycolytic enzymes completely inactivated the antimicrobial effect of the bacteriocins. These bacteriocins were heat-resistant and stable over a wide range of pH (2.0 to 10.0). To confirm its inactivation by lipolytic and glycolytic enzymes, the bacteriocin of E. faecium S6 was further purified by gel filtration, which suggested the existence of carbohydrate and lipid moieties. In addition, enterocin-coding genes were identified by PCR, showing DNA fragments corresponding in size to enterocins A, B, and P for E. faecium S6 and to enterocins B and P for E. faecium R9. In conclusion, these results indicate that partially purified bacteriocins from E. faecium S6 and R9 may be beneficial in controlling Listeria in the dairy industry.
Collapse
Affiliation(s)
- Rita Rahmeh
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait.
| | - Abrar Akbar
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| | - Mohamed Kishk
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| | - Thanyan Al Onaizi
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| | - Aisha Al-Shatti
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| | - Anisha Shajan
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| | - Batool Akbar
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| | - Salwa Al-Mutairi
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| | - Awatef Yateem
- Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, Safat, 13109 Kuwait
| |
Collapse
|
10
|
Escamilla-Martínez EE, Cisneros YMÁ, Fernández FJ, Quirasco-Baruch M, Ponce-Alquicira E. Identification of Structural and Immunity Genes of a Class IIb Bacteriocin Encoded in the Enterocin A Operon of Enterococcus faecium Strain MXVK29. J Food Prot 2017; 80:1851-1856. [PMID: 28990822 DOI: 10.4315/0362-028x.jfp-17-039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 05/31/2017] [Indexed: 11/11/2022]
Abstract
The Enterococcus faecium strain MXVK29, isolated from fermented sausages, produces a bacteriocin with a molecular mass of 3.5 kDa that belongs to the class of enterocins II.1, according to the terminal amino acid sequence, and has been identified as enterocin A. This bacteriocin is active against selected strains of Listeria, Staphylococcus, Pediococcus, and Enterococcus. In this study, we identified the genes adjacent to the structural gene for this bacteriocin, such as the immunity gene (entI) and the inducer gene (entF). Accessory genes for this bacteriocin, such as entK, entR, and entT, were identified as well, in addition to the orf2 and orf3, showing a high identity with class IIb peptides bacteriocins. The orf2 shows the consensus motif GxxxG, similar to those shown by bacteriocins such as PlnNC8α, EntCα, and Ent1071A, whereas orf3 shows a consensus motif SxxxS similar to that present in PlnNC8β (AxxxA). PlnNC8 is expressed only in bacterial cocultures, so there is the possibility that the expression of this two-peptide bacteriocin can be induced by a similar mechanism. So far, only the expression of enterocin A has been found in this strain; however, the presence of the genes ent29α and ent29β opens the possibility for further research on its induction, functionality, and origin. Although there are reports on this type of bacteriocin (EntX, EntC, and Ent1071) in other strains of E. faecium, no report exists yet on an Enterococcus strain producing two different classes of bacteriocin.
Collapse
Affiliation(s)
- E E Escamilla-Martínez
- Division de Ciencias Biológicas y de la Salud, UAM Iztapalapa, Avenida San Rafael Atlixco No. 186, Col. Vicentina, Iztapalapa, 09340, Mexico City (ORCID: http://orcid.org/0000-0003-4676-1828 [F.J.F.])
| | - Y M Álvarez Cisneros
- Division de Ciencias Biológicas y de la Salud, UAM Iztapalapa, Avenida San Rafael Atlixco No. 186, Col. Vicentina, Iztapalapa, 09340, Mexico City (ORCID: http://orcid.org/0000-0003-4676-1828 [F.J.F.])
| | - F J Fernández
- Division de Ciencias Biológicas y de la Salud, UAM Iztapalapa, Avenida San Rafael Atlixco No. 186, Col. Vicentina, Iztapalapa, 09340, Mexico City (ORCID: http://orcid.org/0000-0003-4676-1828 [F.J.F.])
| | - M Quirasco-Baruch
- Facultad de Química UNAM, Avenida Universidad No. 3000, Universidad Nacional Autónoma de México, C. U. Coyoacán, 04510, Mexico City, Mexico
| | - E Ponce-Alquicira
- Division de Ciencias Biológicas y de la Salud, UAM Iztapalapa, Avenida San Rafael Atlixco No. 186, Col. Vicentina, Iztapalapa, 09340, Mexico City (ORCID: http://orcid.org/0000-0003-4676-1828 [F.J.F.])
| |
Collapse
|
11
|
Avci M, Tuncer BÖ. Safety Evaluation of Enterocin Producer Enterococcus sp. Strains Isolated from Traditional Turkish Cheeses. Pol J Microbiol 2017. [DOI: 10.5604/01.3001.0010.7839] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The purpose of this study was to determine the antimicrobial activity and the occurrence of bacteriocin structural genes in Enterococcus spp. isolated from different cheeses and also investigate of their some virulence factors. Enterococcus strains were isolated from 33 different cheeses. Enterococcus faecium (6 strains) and Enterococcus faecalis (5 strains) enterocin-producing strains were identified by 16S rDNA analyses. entA, entB, entP and entX structural genes were detected in some isolates. Multiple enterocin structural genes were found in 7 strains. None of the tested enterococci demonstrated β-haemolytic activity and only one strain has gelatinase activity. Six strains showed multiple antibiotic resistance patterns and in addition, vanA and several virulence genes were detected in many strains. Only E. faecalis MBE1-9 showed tyrosine decarboxylase activity and tdc gene was only detected in this strain.
Collapse
Affiliation(s)
- Mine Avci
- Süleyman Demirel University, Faculty of Engineering, Department of Food Engineering, Isparta, Turkey
| | - Banu Özden Tuncer
- Süleyman Demirel University, Faculty of Engineering, Department of Food Engineering, Isparta, Turkey
| |
Collapse
|
12
|
Evaluation of technological properties of Enterococcus faecium CECT 8849, a strain isolated from human milk, for the dairy industry. Appl Microbiol Biotechnol 2016; 100:7665-77. [PMID: 27216614 DOI: 10.1007/s00253-016-7616-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 05/02/2016] [Accepted: 05/07/2016] [Indexed: 10/21/2022]
Abstract
In this work, a variety of biochemical properties of Enterococcus faecium CECT 8849, which had been isolated from breast milk, were analyzed. Its acidifying capacity and proteolytic activity were low but, in contrast, remarkable peptidase and esterase activities were observed. Ethanol and 3-hydroxy-2-butanone were the most abundant volatile compounds found in experimental model cheese manufactured with E. faecium CECT 8849. This strain inhibited the growth of several Listeria monocytogenes and Listeria innocua strains in vitro. Enterocin A and B structural genes were detected in E. faecium CECT 8849. Model fermented milk and cheeses were manufactured from milk inoculated or not with L. innocua CECT 8848 (2.5-3 log10 colony forming units mL(-1)) using E. faecium CECT 8849 or Lactococcus lactis ESI 153 as starter cultures. Although E. faecium CECT 8849 controlled Listeria growth in both dairy models, it led to lower reduction in Listeria counts when compared with L. lactis ESI 153.
Collapse
|
13
|
Javaherzadeh V, Jamshidian M, Zahraei M, Youseftabar A, Milani M, Hassan M, Lotfipour F. Evaluation of Bacteriocin Activities among Enterococcal Poultry Isolates from East Azarbaijan Iran. PHARMACEUTICAL SCIENCES 2015. [DOI: 10.15171/ps.2015.20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
|
14
|
Hassan M, Brede DA, Diep DB, Nes IF, Lotfipour F, Hojabri Z. Efficient Inactivation of Multi-Antibiotics Resistant Nosocomial Enterococci by Purified Hiracin Bacteriocin. Adv Pharm Bull 2015; 5:393-401. [PMID: 26504762 DOI: 10.15171/apb.2015.054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 04/14/2015] [Accepted: 04/18/2015] [Indexed: 12/27/2022] Open
Abstract
PURPOSE Because of the emergence of multi-antibiotic resistant bacteria, a number of infectious diseases have become a major concern to treat in health care services worldwide. This situation is worsened by the fact that very limited progress has been made in developing new and potent antibiotics in recent years. In this context antimicrobial peptides (AMPs) represent new potential therapeutic compounds with bactericidal or bacteriostatic activity against closely related bacterial strains. METHODS In this study, a collection of enterococci (n=170) from clinical sources were investigated for their potential to inhibit multiresistant nosocomial enterococci from Iranian hospitals. RESULTS Four isolates produced antimicrobial peptides that inhibited all the antibiotic resistant enterococci. This included three Enterococcus faecium isolates producing combinations of enterocin A, B and L50 AB. The most potent antagonism was produced by E. faecalis HO91. Purification and subsequent characterization by MALDI-TOF MS, Edman degradation and DNA-sequencing revealed that the antimicrobial compound was Hiracin. The purified Hiracin was evaluated for antibacterial activity against 12 multiresistant enterococcal isolates from clinical samples. The results demonstrated that Hiracin is highly effective towards enterococci which were resistant even to antibiotics from four distinct classes. CONCLUSION The present research addresses Hiracin as a promising alternative to conventional antibiotics in treatment of multiresistant enterococcal infections.
Collapse
Affiliation(s)
- Maryam Hassan
- Pharmaceutical Biotechnology Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Dag Anders Brede
- Norwegian University of Life Sciences, Department of Chemistry, Biotechnology and Food Science, Laboratory of Microbial Gene Technology, N1432 Aas, Norway
| | - Dzung B Diep
- Norwegian University of Life Sciences, Department of Chemistry, Biotechnology and Food Science, Laboratory of Microbial Gene Technology, N1432 Aas, Norway
| | - Ingolf F Nes
- Norwegian University of Life Sciences, Department of Chemistry, Biotechnology and Food Science, Laboratory of Microbial Gene Technology, N1432 Aas, Norway
| | - Farzaneh Lotfipour
- Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Zoya Hojabri
- Department of Microbiology, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran
| |
Collapse
|
15
|
Nami Y, Haghshenas B, Haghshenas M, Yari Khosroushahi A. Antimicrobial activity and the presence of virulence factors and bacteriocin structural genes in Enterococcus faecium CM33 isolated from ewe colostrum. Front Microbiol 2015; 6:782. [PMID: 26284059 PMCID: PMC4518196 DOI: 10.3389/fmicb.2015.00782] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 07/16/2015] [Indexed: 01/20/2023] Open
Abstract
Screening of lactic acid bacteria (LAB) isolated from ewe colostrum led to the identification and isolation of Enterococcus faecium CM33 with interesting features like high survival rates under acidic or bile salts condition, high tolerance for the simulated gastrointestinal condition, and high adhesive potential to Caco-2 cells. According the inhibition of pathogen adhesion test results, this strain can reduce more than 50% adhesion capacity of Escherichia coli, Shigella flexneri, Klebsiella pneumoniae, Listeria monocytogenes, and Staphylococcus aureus to Caco-2 cells. Based on the antibiotic sensitivity test findings, E. faecium CM33 was susceptible to gentamycin, vancomycin, erythromycin, ampicillin, penicillin, tetracycline, and rifampicin, but resistant to chloramphenicol, clindamycin, and kanamycin. Upon assessment of the virulence determinants for E. faecium CM33, this strain was negative for all tested virulence genes. Furthermore, the genome of this strain was evaluated for the incidence of the known enterocin genes by specific PCR amplification and discovered the genes encoding enterocins A, 31, X, and Q. Based on this study findings, the strain E. faecium CM33 can be considered as a valuable nutraceutical and can be introduced as a new potential probiotic.
Collapse
Affiliation(s)
- Yousef Nami
- Institute of Biosciences, University Putra Malaysia Selangor, Malaysia
| | - Babak Haghshenas
- Institute of Biosciences, University Putra Malaysia Selangor, Malaysia
| | - Minoo Haghshenas
- School of Medicine, Shahid Beheshti University of Medical Sciences Tehran, Iran
| | - Ahmad Yari Khosroushahi
- Drug Applied Research Center, Tabriz University of Medical Sciences Tabriz, Iran ; Department of Pharmacognosy, Faculty of Pharmacy, Tabriz University of Medical Sciences Tabriz, Iran
| |
Collapse
|
16
|
Araújo C, Muñoz-Atienza E, Hernández PE, Herranz C, Cintas LM, Igrejas G, Poeta P. Evaluation of Enterococcus spp. from rainbow trout (Oncorhynchus mykiss, Walbaum), feed, and rearing environment against fish pathogens. Foodborne Pathog Dis 2015; 12:311-22. [PMID: 25671551 DOI: 10.1089/fpd.2014.1906] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The use of lactic acid bacteria of aquatic origin as probiotics constitutes an alternative strategy to the antibiotic treatment for disease control in aquaculture. Enterococci are currently used as probiotics in human and animal health. In this study, we evaluated the safety of 64 enterococci isolated from rainbow trout (Oncorhynchus mykiss, Walbaum), feed and rearing environment, and their antimicrobial activity against 9 fish pathogens. The 64 enterococcal isolates were identified to the species level by polymerase chain reaction (PCR), using specific primers for the different enterococcal species, and confirmed by superoxide dismutase gene sequencing. Enterococcus faecium and E. hirae were the most common species (42.2 and 35.9%, respectively). A total of 48 isolates (75%) showed phenotypic resistance to at least 1 antibiotic determined by a disk-diffusion method, and 25 isolates (39.1%) harbored at least 1 antibiotic resistance gene [erm(B), tet(M), tet(S), tet(K), tet(L), tet(T), vanC2, and aad(E)], detected by PCR. One (1.6%) isolate produced gelatinase and none produced hemolysin, using a plate assay. The virulence genes gelE (46.9%), efaAfs (17.2%), agg (1.6%), and hyl (1.6%) were detected by PCR. A total of 48 isolates (75%) exerted antimicrobial activity against 1 or more of the tested fish pathogens, using a stab-on-agar test. From these isolates, 21 (43.8%) harbored at least 1 bacteriocin-encoding gene (entP, entL50A and entL50B, hirJM79, entSE-K4, entQ and entA), detected by PCR. None of the enterococci showed bile deconjugation and mucin degradation abilities. A total of 17 enterococcal isolates (26.6%) that did not harbor any antibiotic resistance or virulence factor were considered safe for application as probiotics, including 6 isolates (35.3%) that showed antimicrobial activity against at least 1 fish pathogen and harbored at least 1 bacteriocin-encoding gene. Rainbow trout, feed, and rearing environment constitute an appropriate source for the isolation of enterococci as potential probiotic for aquaculture.
Collapse
Affiliation(s)
- Carlos Araújo
- 1 Grupo de Seguridad y Calidad de los Alimentos por Bacterias Lácticas, Bacteriocinas y Probióticos (Grupo SEGABALBP), Departamento de Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Complutense de Madrid , Madrid, Spain
| | | | | | | | | | | | | |
Collapse
|
17
|
Jaouani I, Abbassi M, Alessandria V, Bouraoui J, Ben Salem R, Kilani H, Mansouri R, Messadi L, Cocolin L. High inhibition of Paenibacillus larvae
and Listeria monocytogenes
by Enterococcus
isolated from different sources in Tunisia and identification of their bacteriocin genes. Lett Appl Microbiol 2014; 59:17-25. [DOI: 10.1111/lam.12239] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 02/16/2014] [Accepted: 02/17/2014] [Indexed: 11/27/2022]
Affiliation(s)
- I. Jaouani
- Laboratory of Bacteriological Research; Institute of Veterinary Research of Tunisia; Bab Saadoun Tunis Tunisia
| | - M.S. Abbassi
- Laboratory of Bacteriological Research; Institute of Veterinary Research of Tunisia; Bab Saadoun Tunis Tunisia
| | - V. Alessandria
- Dipartimento di Scienze Agrarie; Forestali e Alimentari; Università di Torino; Grugliasco Turin Italy
| | - J. Bouraoui
- Laboratory of Bacteriological Research; Institute of Veterinary Research of Tunisia; Bab Saadoun Tunis Tunisia
| | - R. Ben Salem
- Laboratory of Bacteriological Research; Institute of Veterinary Research of Tunisia; Bab Saadoun Tunis Tunisia
| | - H. Kilani
- Laboratory of Bacteriological Research; Institute of Veterinary Research of Tunisia; Bab Saadoun Tunis Tunisia
| | - R. Mansouri
- Laboratory of Bacteriological Research; Institute of Veterinary Research of Tunisia; Bab Saadoun Tunis Tunisia
| | - L. Messadi
- National School of Veterinary Medicine; Department of Microbiology and Immunology; La Manouba University; Sidi Thabet Tunisia
| | - L. Cocolin
- Dipartimento di Scienze Agrarie; Forestali e Alimentari; Università di Torino; Grugliasco Turin Italy
| |
Collapse
|
18
|
Santos T, Silva N, Igrejas G, Rodrigues P, Micael J, Rodrigues T, Resendes R, Gonçalves A, Marinho C, Gonçalves D, Cunha R, Poeta P. Dissemination of antibiotic resistant Enterococcus spp. and Escherichia coli from wild birds of Azores Archipelago. Anaerobe 2013; 24:25-31. [DOI: 10.1016/j.anaerobe.2013.09.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 08/25/2013] [Accepted: 09/02/2013] [Indexed: 11/26/2022]
|
19
|
Ruiz-Rodríguez M, Martínez-Bueno M, Martín-Vivaldi M, Valdivia E, Soler JJ. Bacteriocins with a broader antimicrobial spectrum prevail in enterococcal symbionts isolated from the hoopoe's uropygial gland. FEMS Microbiol Ecol 2013; 85:495-502. [DOI: 10.1111/1574-6941.12138] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 04/09/2013] [Accepted: 04/19/2013] [Indexed: 11/27/2022] Open
Affiliation(s)
- Magdalena Ruiz-Rodríguez
- Dpto. Ecología Funcional y Evolutiva; Estación Experimental de Zonas Áridas (EEZA-CSIC); Almería Spain
- Grupo Coevolución; Unidad asociada al CSIC; Universidad de Granada; Granada Spain
| | - Manuel Martínez-Bueno
- Grupo Coevolución; Unidad asociada al CSIC; Universidad de Granada; Granada Spain
- Dpto. Microbiología; Universidad de Granada; Granada Spain
| | - Manuel Martín-Vivaldi
- Grupo Coevolución; Unidad asociada al CSIC; Universidad de Granada; Granada Spain
- Dpto. Zoología; Universidad de Granada; Granada Spain
| | - Eva Valdivia
- Grupo Coevolución; Unidad asociada al CSIC; Universidad de Granada; Granada Spain
- Dpto. Microbiología; Universidad de Granada; Granada Spain
| | - Juan J. Soler
- Dpto. Ecología Funcional y Evolutiva; Estación Experimental de Zonas Áridas (EEZA-CSIC); Almería Spain
- Grupo Coevolución; Unidad asociada al CSIC; Universidad de Granada; Granada Spain
| |
Collapse
|
20
|
López M, Tenorio C, Torres C. Study of Vancomycin Resistance in Faecal Enterococci from Healthy Humans and Dogs in Spain a Decade after the Avoparcin Ban in Europe. Zoonoses Public Health 2012; 60:160-7. [DOI: 10.1111/j.1863-2378.2012.01502.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
21
|
Hassan M, Diep DB, Javadzadeh Y, Dastmalchi S, Nes IF, Sharifi Y, Yari S, Farajnia S, Lotfipour F. Prevalence of bacteriocin activities and bacteriocin-encoding genes in enterococcal clinical isolates in Iran. Can J Microbiol 2012; 58:359-68. [PMID: 22414091 DOI: 10.1139/w11-136] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of the project was to isolate and characterize bacteriocin-producing enterococci, as well as determine the prevalence of enterocin structural genes in 187 enterococcal clinical isolates from the northwest of Iran. The isolates were screened for antibacterial activity against 15 different indicator strains. The proteinaceous nature of the antimicrobial substances was confirmed by sensitivity to proteinase K; their stability to heat treatment was tested at 60 °C and 100 °C for 20 and 10 min, respectively. The PCR method was applied to detect previously identified enterocin genes. Our results showed that 38 (20.3%) of the enterococcal isolates were considered to be potential bacteriocinogenic strains. Furthermore, genes encoding diverse bacteriocin are highly distributed among clinical enterococci, and the strains with multi-bacteriocin genes displayed high antimicrobial activity. Enterocin A, enterolysin A, and enterocin L50A/B were the most abundant structural genes detected in bacteriocinogenic strains. This work is the first survey on the prevalence of bacteriocin genes among clinical enterococci in Iran that has isolated a strain with high antimicrobial activity and sensitivity to clinically relevant antibiotics.
Collapse
|
22
|
Production of bacteriocins by Enterococcus spp. isolated from traditional, Iranian, raw milk cheeses, and detection of their encoding genes. Eur Food Res Technol 2012. [DOI: 10.1007/s00217-012-1697-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
23
|
Almeida T, Brandão A, Muñoz-Atienza E, Gonçalves A, Torres C, Igrejas G, Hernández PE, Herranz C, Cintas LM, Poeta P. Identification of bacteriocin genes in enterococci isolated from game animals and saltwater fish. J Food Prot 2011; 74:1252-60. [PMID: 21819651 DOI: 10.4315/0362-028x.jfp-11-016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Bacteriocins produced by enterococci, referred to as enterocins, possess great interest for their potential use as biopreservatives in food and feed, as well as alternative antimicrobials in humans and animals. In this context, the aim of the present study was to determine the antimicrobial activity and the presence of bacteriocin structural genes in fecal enterococcal isolates from animal origins. Evaluation of the direct antimicrobial activity of 253 isolates from wild boars (Sus scrofa, n = 69), mullets (Liza ramada, n = 117), and partridges (Perdix perdix, n = 67) against eight indicator bacterial strains (including Listeria monocytogenes, Pediococcus pentosaceus, and Enterococcus spp.) showed that 177 (70%) exerted antimicrobial activity against at least one indicator microorganism. From these isolates, 123 were further selected on the basis of their inhibition group, and 81 were found to be producers of bacteriocins active against Listeria monocytogenes. Analysis of the presence of enterocin structural genes in a subset of 36 isolates showed that 70% harbored one or more of the evaluated genes, those of enterocin P and hiracin JM79 being the most prevalent. These results show that wild animals constitute an appropriate source for the isolation of bacteriocinogenic enterococci.
Collapse
Affiliation(s)
- Tereza Almeida
- Institute for Biotechnology and Bioengineering, Veterinary Science Department, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | | | | | | | | | | | | | | | | | | |
Collapse
|