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Ye P, Wang J, Liu M, Li P, Gu Q. Purification and characterization of a novel bacteriocin from Lactobacillus paracasei ZFM54. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111125] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Ben Braïek O, Smaoui S. Enterococci: Between Emerging Pathogens and Potential Probiotics. BIOMED RESEARCH INTERNATIONAL 2019; 2019:5938210. [PMID: 31240218 PMCID: PMC6556247 DOI: 10.1155/2019/5938210] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 04/06/2019] [Accepted: 05/14/2019] [Indexed: 11/17/2022]
Abstract
Enterococci are ubiquitous microorganisms that could be found everywhere; in water, plant, soil, foods, and gastrointestinal tract of humans and animals. They were previously used as starters in food fermentation due to their biotechnological traits (enzymatic and proteolytic activities) or protective cultures in food biopreservation due to their produced antimicrobial bacteriocins called enterocins or as probiotics, live cells with different beneficial characteristics such as stimulation of immunity, anti-inflammatory activity, hypocholesterolemic effect, and prevention/treatment of some diseases. However, in the last years, the use of enterococci in foods or as probiotics caused an important debate because of their opportunistic pathogenicity implicated in several nosocomial infections due to virulence factors and antibiotic resistance, particularly the emergence of vancomycin-resistant enterococci. These virulence traits of some enterococci are associated with genetic transfer mechanisms. Therefore, the development of new enterococcal probiotics needs a strict assessment with regard to safety aspects for selecting the truly harmless enterococcal strains for safe applications. This review tries to give some data of the different points of view about this question.
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Affiliation(s)
- Olfa Ben Braïek
- Laboratory of Transmissible Diseases and Biologically Active Substances (LR99ES27), Faculty of Pharmacy, University of Monastir, Tunisia
| | - Slim Smaoui
- Laboratory of Microorganisms and Biomolecules of the Centre of Biotechnology of Sfax, Tunisia
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Vasilchenko AS, Valyshev AV. Pore-forming bacteriocins: structural–functional relationships. Arch Microbiol 2018; 201:147-154. [DOI: 10.1007/s00203-018-1610-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 08/19/2018] [Accepted: 12/11/2018] [Indexed: 12/21/2022]
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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.
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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
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Vasilchenko AS, Vasilchenko A, Valyshev A, Rogozhin E. A Novel High-Molecular-Mass Bacteriocin Produced by Enterococcus faecium: Biochemical Features and Mode of Action. Probiotics Antimicrob Proteins 2018; 10:427-434. [DOI: 10.1007/s12602-018-9392-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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