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Dias JP, Domingues FC, Ferreira S. Linalool Reduces Virulence and Tolerance to Adverse Conditions of Listeria monocytogenes. Antibiotics (Basel) 2024; 13:474. [PMID: 38927141 PMCID: PMC11201053 DOI: 10.3390/antibiotics13060474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 05/17/2024] [Accepted: 05/19/2024] [Indexed: 06/28/2024] Open
Abstract
Listeria monocytogenes, a foodborne pathogen causing listeriosis, poses substantial societal, economic, and public health challenges due to its resistance, persistence, and biofilm formation in the food industry. Exploring subinhibitory concentrations of compounds to target virulence inhibition and increase susceptibility to adverse conditions presents a promising strategy to mitigate its impact of L. monocytogenes and unveils new potential applications. Thus, this study aims to explore the effect of linalool on virulence factors of L. monocytogenes and potential use in the reduction in its tolerance to stressful conditions. This action was analysed considering the use of two sub-inhibitory concentrations of linalool, 0.312 and 0.625 mg/mL. We found that even with the lowest tested concentrations, a 65% inhibition of violacein production by Chromobacterium violaceum, 55% inhibition in biofilm formation by L. monocytogenes and 62% reduction on haemolysis caused by this bacterium were observed. In addition to its impact on virulence factors, linalool diminished the tolerance to osmotic stress (up to 4.3 log reduction after 24 h with 12% NaCl), as well as to high (up to 3.8 log reduction after 15 min at 55 °C) and low temperatures (up to 4.6 log reduction after 84 days with 12% NaCl at 4 °C). Thus, this study paves the way to further investigation into the potential utilization of linalool to mitigate the threat posed by L. monocytogenes in the field of food safety and public health.
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Affiliation(s)
| | | | - Susana Ferreira
- CICS-UBI Health Sciences Research Centre, University of Beira Interior, Avenida Infante D. Henrique, 6200-506 Covilhã, Portugal; (J.P.D.); (F.C.D.)
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Son J, Hong Y, Seong H, Oh YS, Kwak MK. The high-throughput solid-phase extraction of cis-cyclo(L-Leu-L-Pro) and cis-cyclo(L-Phe-L-Pro) from Lactobacillus plantarum demonstrates efficacy against multidrug-resistant bacteria and influenza A (H3N2) virus. Front Mol Biosci 2024; 11:1346598. [PMID: 38828395 PMCID: PMC11140067 DOI: 10.3389/fmolb.2024.1346598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Accepted: 04/19/2024] [Indexed: 06/05/2024] Open
Abstract
Introduction: 2,5-diketopiperazines are the simplest forms of cyclic dipeptides (CDPs) and have diverse frameworks with chiral side chains that are useful for drug development. Previous research has investigated the antimicrobial properties of proline-linked CDPs and their combinations in the culture filtrate (CF) of Lactobacillus plantarum LBP-K10 using anion exchange chromatography (AEC). However, the quantity of CDPs showcasing notable anti-influenza virus activity derived from AECs was generally lower than those originating from Lactobacillus CF. Methods: To address this issue, the study aims to propose a more efficient method for isolating CDPs and to introduce the antiviral combinations of CDPs obtained using a new method. The study employed a novel technique entailing high-throughput C18-based solid-phase extraction with a methanol gradient (MeSPE). The MeSPE method involved increasing the methanol concentration from 5% to 50% in 5% increments. Results: The methanol SPE fractions (MeSPEfs) eluted with methanol concentrations between 35% and 45% evinced substantial efficacy in inhibiting the influenza A/H3N2 virus via plaque-forming assay. MeSPEf-45, the 45% MeSPEf, exhibited exceptional efficacy in preventing viral infections in Madin-Darby kidney cells, surpassing both individual CDPs and the entire set of MeSPEfs. To identify the specific antiviral components of MeSPEf-45, all MeSPEfs were further fractionated through preparative high-performance liquid chromatography (prep-HPLC). MeSPEf-45 fractions S8 and S11 presented the highest activity against multidrug-resistant bacteria and influenza A/H3N2 virus among all MeSPEfs, with 11 common fractions. Antiviral fractions S8 and S11 were identified as proline-based CDPs, specifically cis-cyclo(L-Leu-L-Pro) and cis-cyclo(L-Phe-L-Pro), using gas chromatography-mass spectrometry. The combination of MeSPEf-45 fractions S8 and S11 displayed superior antibacterial and anti-influenza virus effects compared to the individual fractions S8 and S11. Discussion: High-throughput MeSPE-derived MeSPEfs and subsequent HPLC-fractionated fractions presents an innovative approach to selectively purify large amounts of potent antimicrobial CDPs from bacterial CF. The findings also show the effectiveness of physiologically bioactive combinations that utilize fractions not containing CDP. This study provides the initial evidence demonstrating the antimicrobial properties of CDPs acquired through high-throughput SPE techniques.
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Affiliation(s)
- Jaeyoung Son
- Laboratory of Microbial Physiology and Biotechnology, Department of Food and Nutrition, Institute of Food and Nutrition Science, College of Bio-Convergence, Eulji University, Seongnam, Republic of Korea
| | - Yeonju Hong
- Laboratory of Microbial Physiology and Biotechnology, Department of Food and Nutrition, Institute of Food and Nutrition Science, College of Bio-Convergence, Eulji University, Seongnam, Republic of Korea
| | - Hyeri Seong
- Laboratory of Microbial Physiology and Biotechnology, Department of Food and Nutrition, Institute of Food and Nutrition Science, College of Bio-Convergence, Eulji University, Seongnam, Republic of Korea
| | - Yoon Sin Oh
- Department of Food and Nutrition, Institute of Food and Nutrition Science, College of Bio-Convergence, Eulji University, Seongnam, Republic of Korea
| | - Min-Kyu Kwak
- Laboratory of Microbial Physiology and Biotechnology, Department of Food and Nutrition, Institute of Food and Nutrition Science, College of Bio-Convergence, Eulji University, Seongnam, Republic of Korea
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Caruso DJ, Palombo EA, Moulton SE, Duggan PJ, Zaferanloo B. Antibacterial and Antibiofilm Activity of Endophytic Alternaria sp. Isolated from Eremophila longifolia. Antibiotics (Basel) 2023; 12:1459. [PMID: 37760755 PMCID: PMC10525891 DOI: 10.3390/antibiotics12091459] [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: 08/30/2023] [Revised: 09/16/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023] Open
Abstract
The threat to public health resulting from the emergence of antimicrobial resistance (AMR) is ever rising. One of the major bacterial pathogens at the forefront of this problem is methicillin-resistant Staphylococcus aureus, or MRSA, for which there is a great need to find alternative treatments. One of the most promising alternatives is endophytic fungi, which were shown to produce a vast array of bioactive compounds, including many novel antibacterial compounds. In this study, two endophytic Alternaria sp., EL 24 and EL 35, were identified from the leaves of Eremophila longifolia. Ethyl acetate (EtOAc) extracts of their culture filtrates were found to inhibit both methicillin-sensitive S. aureus ATCC 25923 and MRSA strains M173525 and M180920. The activity of each extract was shown to be greatly affected by the growth medium, with considerable reductions in minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) observed when tested in tryptic soy broth with glucose (TSBG) compared with Mueller-Hinton broth (MHB). Both extracts displayed significant (p ≤ 0.05) antibiofilm activity against all three S. aureus strains, the greatest of which was that of EL 35, which reduced biofilm formation by M180920 by 72%, while that of EL 24 resulted in a 57% reduction against ATCC 25923. Both extracts also disrupted established biofilms, of which the most effective was EL 35, which reduced the M180920 biofilm by 64%, while EL 24 also performed best against M180920, reducing biofilm by 54%. Gas chromatography-mass spectrometry (GC-MS) analysis of the EL 24 EtOAc extract revealed five known compounds. This study highlights the promise of endophytic fungi from Australian plants as a potential source of substances effective against important bacterial pathogens. Further understanding of the responsible compounds and their mechanisms could lead to the development of treatments effective against MRSA, as well as novel biofilm-resistant biomedical materials, contributing towards reducing the burden of AMR.
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Affiliation(s)
- Daniel J Caruso
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Simon E Moulton
- Department of Engineering Technologies, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Peter J Duggan
- CSIRO Manufacturing, Research Way, Clayton, VIC 3168, Australia
- College of Science and Engineering, Flinders University, Adelaide, SA 5042, Australia
| | - Bita Zaferanloo
- Department of Chemistry and Biotechnology, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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Hofmann D, Thiele B, Siebers M, Rahmati M, Schütz V, Jeong S, Cui J, Bigler L, Held F, Wu B, Babic N, Kovacic F, Hamacher J, Hölzl G, Dörmann P, Schulz M. Implications of Below-Ground Allelopathic Interactions of Camelina sativa and Microorganisms for Phosphate Availability and Habitat Maintenance. PLANTS (BASEL, SWITZERLAND) 2023; 12:2815. [PMID: 37570969 PMCID: PMC10421311 DOI: 10.3390/plants12152815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023]
Abstract
Toxic breakdown products of young Camelina sativa (L.) Crantz, glucosinolates can eliminate microorganisms in the soil. Since microorganisms are essential for phosphate cycling, only insensitive microorganisms with phosphate-solubilizing activity can improve C. sativa's phosphate supply. In this study, 33P-labeled phosphate, inductively coupled plasma mass spectrometry and pot experiments unveiled that not only Trichoderma viride and Pseudomonas laurentiana used as phosphate-solubilizing inoculants, but also intrinsic soil microorganisms, including Penicillium aurantiogriseum, and the assemblies of root-colonizing microorganisms solubilized as well phosphate from apatite, trigger off competitive behavior between the organisms. Driving factors in the competitiveness are plant and microbial secondary metabolites, while glucosinolates of Camelina and their breakdown products are regarded as key compounds that inhibit the pathogen P. aurantiogriseum, but also seem to impede root colonization of T. viride. On the other hand, fungal diketopiperazine combined with glucosinolates is fatal to Camelina. The results may contribute to explain the contradictory effects of phosphate-solubilizing microorganisms when used as biofertilizers. Further studies will elucidate impacts of released secondary metabolites on coexisting microorganisms and plants under different environmental conditions.
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Affiliation(s)
- Diana Hofmann
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
| | - Björn Thiele
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
| | - Meike Siebers
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Mehdi Rahmati
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
- Department of Soil Science and Engineering, University of Maragheh, Maragheh 83111-55181, Iran
| | - Vadim Schütz
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Seungwoo Jeong
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Jiaxin Cui
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Laurent Bigler
- Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland; (L.B.); (F.H.)
| | - Federico Held
- Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland; (L.B.); (F.H.)
| | - Bei Wu
- IBG-3: Agrosphäre, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; (D.H.); (B.T.); (M.R.); (B.W.)
| | - Nikolina Babic
- Institute of Molecular Enzyme Technology, Heinrich-Heine-University of Düsseldorf and Forschungszentrum Jülich GmbH, 52428 Jülich, Germany (F.K.)
| | - Filip Kovacic
- Institute of Molecular Enzyme Technology, Heinrich-Heine-University of Düsseldorf and Forschungszentrum Jülich GmbH, 52428 Jülich, Germany (F.K.)
| | - Joachim Hamacher
- Plant Diseases and Crop Protection, Institute of Crop Science and Resource Conservation, University of Bonn, 53115 Bonn, Germany;
| | - Georg Hölzl
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Peter Dörmann
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
| | - Margot Schulz
- IMBIO Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, 53115 Bonn, Germany (V.S.); (G.H.); (P.D.)
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Fernández-García M, Ares-Arroyo M, Wedel E, Montero N, Barbas C, Rey-Stolle MF, González-Zorn B, García A. Multiplatform Metabolomics Characterization Reveals Novel Metabolites and Phospholipid Compositional Rules of Haemophilus influenzae Rd KW20. Int J Mol Sci 2023; 24:11150. [PMID: 37446331 DOI: 10.3390/ijms241311150] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 06/30/2023] [Accepted: 07/04/2023] [Indexed: 07/15/2023] Open
Abstract
Haemophilus influenzae is a gram-negative bacterium of relevant clinical interest. H. influenzae Rd KW20 was the first organism to be sequenced and for which a genome-scale metabolic model (GEM) was developed. However, current H. influenzae GEMs are unable to capture several aspects of metabolome nature related to metabolite pools. To directly and comprehensively characterize the endometabolome of H. influenzae Rd KW20, we performed a multiplatform MS-based metabolomics approach combining LC-MS, GC-MS and CE-MS. We obtained direct evidence of 15-20% of the endometabolome present in current H. influenzae GEMs and showed that polar metabolite pools are interconnected through correlating metabolite islands. Notably, we obtained high-quality evidence of 18 metabolites not previously included in H. influenzae GEMs, including the antimicrobial metabolite cyclo(Leu-Pro). Additionally, we comprehensively characterized and evaluated the quantitative composition of the phospholipidome of H. influenzae, revealing that the fatty acyl chain composition is largely independent of the lipid class, as well as that the probability distribution of phospholipids is mostly related to the conditional probability distribution of individual acyl chains. This finding enabled us to provide a rationale for the observed phospholipid profiles and estimate the abundance of low-level species, permitting the expansion of the phospholipidome characterization through predictive probabilistic modelling.
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Affiliation(s)
- Miguel Fernández-García
- Centro de Metabolómica y Bioanálisis (CEMBIO), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Spain
- Departamento de Ciencias Médicas Básicas, Facultad de Medicina, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Spain
| | - Manuel Ares-Arroyo
- Antimicrobial Resistance Unit (ARU), Departamento de Sanidad Animal and Centro de Vigilancia Sanitaria Veterinaria (VISAVET), Complutense University of Madrid, 28040 Madrid, Spain
| | - Emilia Wedel
- Antimicrobial Resistance Unit (ARU), Departamento de Sanidad Animal and Centro de Vigilancia Sanitaria Veterinaria (VISAVET), Complutense University of Madrid, 28040 Madrid, Spain
| | - Natalia Montero
- Antimicrobial Resistance Unit (ARU), Departamento de Sanidad Animal and Centro de Vigilancia Sanitaria Veterinaria (VISAVET), Complutense University of Madrid, 28040 Madrid, Spain
| | - Coral Barbas
- Centro de Metabolómica y Bioanálisis (CEMBIO), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Spain
| | - Mª Fernanda Rey-Stolle
- Centro de Metabolómica y Bioanálisis (CEMBIO), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Spain
| | - Bruno González-Zorn
- Antimicrobial Resistance Unit (ARU), Departamento de Sanidad Animal and Centro de Vigilancia Sanitaria Veterinaria (VISAVET), Complutense University of Madrid, 28040 Madrid, Spain
| | - Antonia García
- Centro de Metabolómica y Bioanálisis (CEMBIO), Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28660 Boadilla del Monte, Spain
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Ogilvie CE, Czekster CM. Cyclic dipeptides and the human microbiome: Opportunities and challenges. Bioorg Med Chem 2023; 90:117372. [PMID: 37343497 DOI: 10.1016/j.bmc.2023.117372] [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: 04/08/2023] [Revised: 05/24/2023] [Accepted: 06/07/2023] [Indexed: 06/23/2023]
Abstract
Research into the human microbiome has implicated its constituents in a variety of non-communicable diseases, with certain microbes found to promote health and others leading to dysbiosis and pathogenesis.Microbes communicate and coordinate their behaviour through the secretion of small molecules, such as cyclic dipeptides (CDPs), into their surrounding environment. CDPs are ubiquitous signalling molecules thatexhibit a wide range of biological activities, with particular relevance to human health due to their potential to act as microbiome modulators.
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Affiliation(s)
- Charlene Elizabeth Ogilvie
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom.
| | - Clarissa Melo Czekster
- School of Biology, Biomedical Sciences Research Complex, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom.
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Li Y, Li P, Zhang W, Zheng X, Gu Q. New Wine in Old Bottle: Caenorhabditis Elegans in Food Science. FOOD REVIEWS INTERNATIONAL 2023. [DOI: 10.1080/87559129.2023.2172429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Affiliation(s)
- Yonglu Li
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, People’s Republic of China
| | - Ping Li
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, People’s Republic of China
| | - Weixi Zhang
- Department of Food Science and Nutrition; Zhejiang Key Laboratory for Agro-food Processing; Fuli Institute of Food Science; National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang University, Hangzhou, People’s Republic of China
| | - Xiaodong Zheng
- Department of Food Science and Nutrition; Zhejiang Key Laboratory for Agro-food Processing; Fuli Institute of Food Science; National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang University, Hangzhou, People’s Republic of China
| | - Qing Gu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, People’s Republic of China
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Deng Y, Liu Y, Li J, Wang X, He S, Yan X, Shi Y, Zhang W, Ding L. Marine natural products and their synthetic analogs as promising antibiofilm agents for antibiotics discovery and development. Eur J Med Chem 2022; 239:114513. [DOI: 10.1016/j.ejmech.2022.114513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/31/2022] [Accepted: 06/01/2022] [Indexed: 12/25/2022]
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Song Y, Ma F, Sun M, Mu G, Tuo Y. The Chemical Structure Properties and Promoting Biofilm Activity of Exopolysaccharide Produced by Shigella flexneri. Front Microbiol 2022; 12:807397. [PMID: 35185832 PMCID: PMC8854994 DOI: 10.3389/fmicb.2021.807397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 12/23/2021] [Indexed: 11/17/2022] Open
Abstract
Shigella flexneri is a waterborne and foodborne pathogen that can damage human health. The exopolysaccharides (S-EPS) produced by S. flexneri CMCC51574 were found to promote biofilm formation and virulence. In this research, the crude S-EPS produced by S. flexneri CMCC51574 were separated into three main different fractions, S-EPS 1-1, S-EPS 2-1, and S-EPS 3-1. The structure of the S-ESP 2-1 was identified by FT-IR, ion chromatography analysis, methylation analysis, and NMR analysis. The main chain of S-EPS 2-1 was α-Manp-(1 → 3)-α-Manp-[(1 → 2,6)-α-Manp]15-[(1 → 2)-Manf-(1→]8; there were two branched-chain R1 and R2 with a ratio of 4:1, R1: α-Manp-(1 → 6)- and R2: α-Manp-(1 → 6)- Glc-(1 → 6)- were linked with (1 → 2,6)-α-Manp. It was found that S-EPS 2-1 exhibited the highest promoting effect on biofilm formation of S. flexneri. The S-EPS 2-1 was identified to interact with extracellular DNA (eDNA) of S. flexneri, indicating that the S-EPS 2-1 was the specific polysaccharide in the spatial structure of biofilm formation. Our research found the important role of S-EPS in S. flexneri biofilm formation, which will help us to understand the underlining mechanisms of the biofilm formation and find effective ways to prevent S. flexneri biofilm infection.
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Affiliation(s)
- Yinglong Song
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
| | - Fenglian Ma
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
| | - Mengying Sun
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
| | - Guangqing Mu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- Dalian Probiotics Function Research Key Laboratory, Dalian Polytechnic University, Dalian, China
| | - Yanfeng Tuo
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, China
- *Correspondence: Yanfeng Tuo,
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Jothi R, Hari Prasath N, Gowrishankar S, Pandian SK. Bacterial Quorum-Sensing Molecules as Promising Natural Inhibitors of Candida albicans Virulence Dimorphism: An In Silico and In Vitro Study. Front Cell Infect Microbiol 2021; 11:781790. [PMID: 34926324 PMCID: PMC8677694 DOI: 10.3389/fcimb.2021.781790] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 11/12/2021] [Indexed: 11/25/2022] Open
Abstract
Farnesol, a self-secreted quorum-sensing molecule (QSM) of Candida albicans, has been known to limit yeast-to-hyphal transition by blocking the RAS1-cAMP-PKA pathway. In a similar fashion, certain bacterial QSMs have also been reported to be successful in attenuating C. albicans biofilm and hyphal formation at relatively high cell density. This prompted us to investigate the antihyphal efficacy of certain bacterial QSMs through virtual docking against seminal drug targets, viz., CYCc and RAS1, that have been reported to be the hallmark players in C. albicans dimorphic virulence cascade. Against this backdrop, 64 QSMs belonging to five different bacterial QS signaling systems were subjected to initial virtual screening with farnesol as reference. Data of the virtual screening unveiled QSMs belonging to diketopiperazines (DKPs), i.e., 3-benzyl-6-isobutylidene-2,5-piperazinedione (QSSM 1157) and cyclo(l-Pro-l-Leu) (QSSM 1112), as potential inhibitors of CYCc and RAS1 with binding energies of -8.2 and -7.3 kcal mol-1, respectively. Further, the molecular dynamics simulations (for 50 ns) of CYCc-QSSM 1157 and RAS1-QSSM 1112 complexes revealed the mean ligand root mean square deviation (RMSD) values of 0.35 and 0.27 Å, respectively, which endorsed the rigid nature, less fluctuation in binding stiffness, and conformation of binding complexes. Furthermore, the identified two QSMs were found to be good in solubility, absorption, and permeation and less toxic in nature, as revealed by pharmacokinetics and toxicity analyses. In addition, the in vitro antihyphal assays using liquid and solid media, germ-tube experiment, and microscopic analysis strongly validated DKP-QSSM 1112 as a promising inhibitor of hyphal transition. Taken together, the present study unequivocally proves that DKPs can be used as potent inhibitors of C. albicans virulence dimorphism.
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Djebbah FZ, Belyagoubi L, Abdelouahid DE, Kherbouche F, Al-Dhabi NA, Arasu MV, Ravindran B. Isolation and characterization of novel Streptomyces strain from Algeria and its in-vitro antimicrobial properties against microbial pathogens. J Infect Public Health 2021; 14:1671-1678. [PMID: 34627064 DOI: 10.1016/j.jiph.2021.09.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 09/13/2021] [Accepted: 09/27/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND The constant development of microbial resistance to the traditional antimicrobial agents and the emergence of new infectious diseases justify the urgent need for new effective antimicrobial molecules. However, the irrational use of antibiotics increases microbial resistance dramatically and along with that the frequency of mortality associated with infections is higher. Therefore, to combat the antimicrobial resistance, the screening of compounds with novel chemical structures is essential. This study intended to determine the antimicrobial potential of Streptomyces GLD22 strain isolated from Algeria. METHODS The characterization of Streptomyces strain GLD22 was performed by physiological, biochemical and molecular tests. The antimicrobial activity was tested by the well diffusion method and the minimum inhibitory concentration value calculation were performed using broth micro dilution technique. The extracellular metabolites profiling was done using GC-MS. RESULTS Physiological, biochemical and phylogenetic analysis confirmed that the strain GLD22 showed maximum identity towards Streptomyces species. The extra cellular metabolites revealed their antimicrobial activity at 1 mg/ml for Klebsiella pneumoniae, Pseudomonas aeruginosa and Escherichia coli, whereas Staphylococcus aureus, Bacillus cereus and Bacillus subtilis documented 0.5, 1 and 1 mg/ml respectively. GC-MS analysis confirmed that 2-tert-butyl-4,6-bis(3,5-di-tert-butyl-4-hydroxybenzyl) phenol, Dibutyl phthalate and Cyclo(leucyloprolyl) were the major drug molecules present in the extract. CONCLUSION The novel Streptomyces strain GLD22 recovered from the Gueldaman cave of Algeria showed better antimicrobial activity towards both Gram positive and Gram negative pathogens. Interestingly, the MIC values were comparable with the standard drug molecules. In addition, the identification of active metabolites present in the crude extracts was an advantage.
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Affiliation(s)
- Fatima Zohra Djebbah
- Laboratoire de Microbiologie Appliquée à l'Agro-alimentaire, Au Biomédical et à l'Environnement (LAMAABE), Département de Biologie, Université Abou Bekr Belkaid, BP 119, Imama, 13000 Tlemcen, Algeria.
| | - Larbi Belyagoubi
- Laboratoire des Produits Naturels (LAPRONA), Département de Biologie, Université Abou Bekr Belkaid, BP 119, Imama, 13000 Tlemcen, Algeria
| | - Djamel Eddine Abdelouahid
- Laboratoire de Microbiologie Appliquée à l'Agro-alimentaire, Au Biomédical et à l'Environnement (LAMAABE), Département de Biologie, Université Abou Bekr Belkaid, BP 119, Imama, 13000 Tlemcen, Algeria
| | - Farid Kherbouche
- Centre National de Recherches Préhistoriques, Anthropologiqes et Historiques (CNRPAH), 3 rue Franklin Roosevelt, 16000 Alger, Algeria
| | - Naif Abdullah Al-Dhabi
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
| | - Mariadhas Valan Arasu
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Balasubramani Ravindran
- Department of Environmental Energy and Engineering, Kyonggi University Youngtong-Gu, Suwon, Gyeonggi-Do, 16227, Republic of Korea
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12
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Alexpandi R, Ponraj JG, Swasthikka RP, Abirami G, Ragupathi T, Jayakumar R, Ravi AV. Anti-QS mediated anti-infection efficacy of probiotic culture-supernatant against Vibrio campbellii infection and the identification of active compounds through in vitro and in silico analyses. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2021. [DOI: 10.1016/j.bcab.2021.102108] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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13
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Yeni F, Samut H, Soyer Y. Effect of Non-LAB Probiotics on Foodborne Enteric Pathogens: A Systematic Review. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2021.1938114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Filiz Yeni
- Department of Food Engineering, Middle East Technical University, Ankara, Turkey
| | - Hilal Samut
- Department of Food Engineering, Middle East Technical University, Ankara, Turkey
| | - Yeşim Soyer
- Department of Food Engineering, Middle East Technical University, Ankara, Turkey
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14
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Doghri I, Cherifi T, Goetz C, Malouin F, Jacques M, Fravalo P. Counteracting Bacterial Motility: A Promising Strategy to Narrow Listeria monocytogenes Biofilm in Food Processing Industry. Front Microbiol 2021; 12:673484. [PMID: 34149663 PMCID: PMC8206544 DOI: 10.3389/fmicb.2021.673484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 05/04/2021] [Indexed: 12/21/2022] Open
Abstract
Listeria monocytogenes (L. monocytogenes) is often associated with processed food as it can form biofilms that represent a source of contamination at all stages of the manufacturing chain. The control and prevention of biofilms in food-processing plants are of utmost importance. This study explores the efficacy of prospect molecules for counteracting bacterial mechanisms leading to biofilm formation. The compounds included the phytomolecule tomatidine, zinc chloride (ZnCl2), ethylenediaminetetraacetic acid (EDTA), and a more complexed mixture of bacterial compounds from coagulase-negative staphylococci (CNS exoproducts). Significant inhibition of L. monocytogenes biofilm formation was evidenced using a microfluidic system and confocal microscopic analyses (p < 0.001). Active molecules were effective at an early stage of biofilm development (≥50% of inhibition) but failed to disperse mature biofilms of L. monocytogenes. According to our findings, prevention of surface attachment was associated with a disruption of bacterial motility. Indeed, agar cell motility assays demonstrated the effectiveness of these molecules. Overall, results highlighted the critical role of motility in biofilm formation and allow to consider flagellum-mediated motility as a promising molecular target in control strategies against L. monocytogenes in food processing environments.
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Affiliation(s)
- Ibtissem Doghri
- Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada.,Regroupement de Recherche pour un Lait de Qualité Optimale (Op+Lait), Montreal, QC, Cananda
| | - Tamazight Cherifi
- Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada.,Chaire de Recherche en Salubrité des Viandes (CRSV), Montreal, QC, Cananda
| | - Coralie Goetz
- Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada.,Regroupement de Recherche pour un Lait de Qualité Optimale (Op+Lait), Montreal, QC, Cananda
| | - François Malouin
- Regroupement de Recherche pour un Lait de Qualité Optimale (Op+Lait), Montreal, QC, Cananda.,Département de Biologie, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Mario Jacques
- Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada.,Regroupement de Recherche pour un Lait de Qualité Optimale (Op+Lait), Montreal, QC, Cananda
| | - Philippe Fravalo
- Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada.,Chaire de Recherche en Salubrité des Viandes (CRSV), Montreal, QC, Cananda
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15
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Hong MJ, Kim MK, Park Y. Comparative Antimicrobial Activity of Hp404 Peptide and Its Analogs against Acinetobacter baumannii. Int J Mol Sci 2021; 22:ijms22115540. [PMID: 34073939 PMCID: PMC8197367 DOI: 10.3390/ijms22115540] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/07/2021] [Accepted: 05/19/2021] [Indexed: 12/24/2022] Open
Abstract
An amphipathic α-helical peptide, Hp1404, was isolated from the venomous gland of the scorpion Heterometrus petersii. Hp1404 exhibits antimicrobial activity against methicillin-resistant Staphylococcus aureus but is cytotoxic. In this study, we designed antimicrobial peptides by substituting amino acids at the 14 C-terminal residues of Hp1404 to reduce toxicity and improve antibacterial activity. The analog peptides, which had an amphipathic α-helical structure, were active against gram-positive and gram-negative bacteria, particularly multidrug-resistant Acinetobacter baumannii, and showed lower cytotoxicity than Hp1404. N-phenyl-1-naphthylamine uptake and DisC3-5 assays demonstrated that the peptides kill bacteria by effectively permeating the outer and cytoplasmic membranes. Additionally, the analog peptides inhibited biofilm formation largely than Hp1404 at low concentrations. These results suggest that the analog peptides of Hp1404 can be used as therapeutic agents against A. baumannii infection.
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Affiliation(s)
- Min Ji Hong
- Department of Biomedical Sciences, Chosun University, Gwangju 61452, Korea; (M.J.H.); (M.K.K.)
| | - Min Kyung Kim
- Department of Biomedical Sciences, Chosun University, Gwangju 61452, Korea; (M.J.H.); (M.K.K.)
| | - Yoonkyung Park
- Department of Biomedical Sciences, Chosun University, Gwangju 61452, Korea; (M.J.H.); (M.K.K.)
- Research Center for Proteineous Materials, Chosun University, Gwangju 61452, Korea
- Correspondence: ; Tel.: +82-62-230-6854; Fax: +82-62-225-6758
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16
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Vairagkar U, Nipanikar-Gokhale P, Mirza Y. Genomic insights into biocontrol potential of edible seaweed-associated Bacillus velezensis MTCC 10456 from Gulf of Mannar. Arch Microbiol 2021; 203:2941-2952. [PMID: 33770230 DOI: 10.1007/s00203-021-02244-3] [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: 05/03/2020] [Revised: 01/06/2021] [Accepted: 02/15/2021] [Indexed: 10/21/2022]
Abstract
Bacillus velezensis MTCC 10456, is a marine mesophilic heterotrophic bacterium, isolated from edible red seaweed, Laurenciae papillosa, with a potential for plant growth promotion and biocontrol activity. We report the genome sequence analysis of strain MTCC 10456, which has a genome size of 4.19 Mb with an average G + C content of 45.9%, 4077 coding sequences and 94 RNAs. Comparative genome analysis of MTCC 10456 with 76 other land plant-based strains with complete information on the source of their isolation, was carried out. This study provided evidence that multiple gene clusters that contributed to the seaweed colonization, growth promotion, immunity and hyperosmotic stress tolerance are conserved in different B. velezensis strains. A unique methyltransferase gene that can cause global alterations in DNA methylation patterns affecting gene expression and regulation of transcription in MTCC 10456 genome was identified. The genome provides insights into multiple gene clusters encoding antagonistic metabolites, such as non-ribosomal peptide synthetases (NRPSs) and polyketide synthetases (PKSs), unidentified metabolites and genes for antimicrobial resistance. Overall, findings from this study indicate the application of B. velezensis MTCC 10456 in the aquaculture industry as a biocontrol agent and may also contribute in understanding the ecological adaptations of plant-associated B. velezensis strains in different habitats.
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Affiliation(s)
- Uttara Vairagkar
- Praj-Matrix-R and D Centre (Division of Praj Industries Limited), 402/403/1098, Urawade, Pirangut, Mulshi, Pune, 412115, India.,Department of Technology, Savitribai Phule Pune University, Ganeshkhind, Pune, 411007, India
| | - Padmaja Nipanikar-Gokhale
- Praj-Matrix-R and D Centre (Division of Praj Industries Limited), 402/403/1098, Urawade, Pirangut, Mulshi, Pune, 412115, India
| | - Yasmin Mirza
- Praj-Matrix-R and D Centre (Division of Praj Industries Limited), 402/403/1098, Urawade, Pirangut, Mulshi, Pune, 412115, India.
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17
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Khan F, Oloketuyi SF, Kim YM. Diversity of Bacteria and Bacterial Products as Antibiofilm and Antiquorum Sensing Drugs Against Pathogenic Bacteria. Curr Drug Targets 2020; 20:1156-1179. [PMID: 31020938 DOI: 10.2174/1389450120666190423161249] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 02/25/2019] [Accepted: 04/12/2019] [Indexed: 12/14/2022]
Abstract
The increase in antibiotic resistance of pathogenic bacteria has led to the development of new therapeutic approaches to inhibit biofilm formation as well as interfere quorum sensing (QS) signaling systems. The QS system is a phenomenon in which pathogenic bacteria produce signaling molecules that are involved in cell to cell communication, production of virulence factors, biofilm maturation, and several other functions. In the natural environment, several non-pathogenic bacteria are present as mixed population along with pathogenic bacteria and they control the behavior of microbial community by producing secondary metabolites. Similarly, non-pathogenic bacteria also take advantages of the QS signaling molecule as a sole carbon source for their growth through catabolism with enzymes. Several enzymes are produced by bacteria which disrupt the biofilm architecture by degrading the composition of extracellular polymeric substances (EPS) such as exopolysaccharide, extracellular- DNA and protein. Thus, the interference of QS system by bacterial metabolic products and enzymatic catalysis, modification of the QS signaling molecules as well as enzymatic disruption of biofilm architecture have been considered as the alternative therapeutic approaches. This review article elaborates on the diversity of different bacterial species with respect to their metabolic products as well as enzymes and their molecular modes of action. The bacterial enzymes and metabolic products will open new and promising perspectives for the development of strategies against the pathogenic bacterial infections.
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Affiliation(s)
- Fazlurrahman Khan
- Marine-Integrated Bionics Research Center, Pukyong National University, Busan 48513, South Korea
| | | | - Young-Mog Kim
- Marine-Integrated Bionics Research Center, Pukyong National University, Busan 48513, South Korea.,Department of Food Science and Technology, Pukyong National University, Busan 48513, South Korea
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18
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Song Y, Sun M, Feng L, Liang X, Song X, Mu G, Tuo Y, Jiang S, Qian F. Antibiofilm Activity of Lactobacillus plantarum 12 Exopolysaccharides against Shigella flexneri. Appl Environ Microbiol 2020; 86:e00694-20. [PMID: 32444475 PMCID: PMC7376565 DOI: 10.1128/aem.00694-20] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 05/14/2020] [Indexed: 12/13/2022] Open
Abstract
In developing countries, Shigella flexneri is the most common enteric pathogen causing bacillary dysentery. Biofilm formation by S. flexneri can cause the emergence of antibiotic-resistant strains, which poses serious threats to food safety and human health. In this study, the effects of Lactobacillus plantarum 12 exopolysaccharides (L-EPSs) and S. flexneri exopolysaccharides (S-EPSs) on S. flexneri CMCC51574 biofilm formation were investigated. The results showed that L-EPS could decrease polysaccharide production in the extracellular polymeric matrix of S. flexneri and inhibit biofilm formation by S. flexneri L-EPS could decrease the minimum biofilm elimination concentration (MBEC) of antibiotics against S. flexneri biofilm and inhibit S. flexneri adhesion to and invasion into HT-29 cell monolayers, which might be ascribed to S. flexneri biofilm disturbance by L-EPS. In contrast, S-EPS exhibited the opposite effects compared to L-EPS. The monosaccharide composition analysis showed that L-EPS was composed of mannose, glucuronic acid, galactosamine, glucose, galactose, and xylose, with the molar ratio of 32.26:0.99:1.79:5.63:0.05:4.07, while S-EPS was composed of mannose, glucuronic acid, galactosamine, glucose, and galactose, with the molar ratio of 25.43:2.28:7.13:5.35. L-EPS was separated into the neutral polysaccharide L-EPS 1-1 and the acidic polysaccharide L-EPS 2-1 by ion-exchange chromatography and gel chromatography. L-EPS 2-1 exerted higher antibiofilm activity than L-EPS 1-1. The antibiofilm activity of L-EPS might be associated with its structure.IMPORTANCES. flexneri is a widespread foodborne pathogen causing food contamination and responsible for food poisoning outbreaks related to various foods in developing countries. Not only has biofilm formation by S. flexneri been difficult to eliminate, but it has also increased the drug resistance of the strain. In the present study, it was demonstrated that L-EPSs secreted by Lactobacillus plantrum 12 could inhibit S. flexneri biofilm formation on, adhesion to, and invasion into HT-29 cells. Also, L-EPSs could decrease the minimum biofilm elimination concentration (MBEC) of the antibiotics used against S. flexneri biofilm. Therefore, L-EPSs were shown to be bioactive macromolecules with the potential ability to act against S. flexneri infections.
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Affiliation(s)
- Yinglong Song
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Mengying Sun
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Lu Feng
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Xue Liang
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Xing Song
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Guangqing Mu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
- Dalian Probiotics Function Research Key Laboratory, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Yanfeng Tuo
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Shujuan Jiang
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
| | - Fang Qian
- School of Food Science and Technology, Dalian Polytechnic University, Dalian, People's Republic of China
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19
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Li G, Wang G, Li M, Li L, Liu H, Sun M, Wen Z. Morin inhibits Listeria monocytogenes virulence in vivo and in vitro by targeting listeriolysin O and inflammation. BMC Microbiol 2020; 20:112. [PMID: 32398085 PMCID: PMC7216731 DOI: 10.1186/s12866-020-01807-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 04/29/2020] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Listeria monocytogenes (L. monocytogenes) is a global opportunistic intracellular pathogen that can cause many infections, including meningitis and abortion in humans and animals; thus, L. monocytogenes poses a great threat to public safety and the development of the aquaculture industry. The isolation rate of Listeria monocytogenes in fishery products has always been high. And the pore-forming toxin listeriolysin O (LLO) is one of the most important virulence factors of L. monocytogenes. LLO can promote cytosolic bacterial proliferation and help the pathogen evade attacks from the host immune system. In addition, L. monocytogenes infection can trigger a series of severe inflammatory reactions. RESULTS Here, we further confirmed that morin lacking anti-Listeria activity could inhibit LLO oligomerization. We also found that morin can effectively alleviate the inflammation induced by Listeria in vivo and in vitro and exerted an obvious protective effect on infected cells and mice. CONCLUSIONS Morin does not possess anti-Listeria activity, neither does it interfere with secretion of LLO. However, morin inhibits oligomerisation of LLO and morin does reduce the inflammation caused during Listeria infection.
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Affiliation(s)
- Gen Li
- Department of Respiratory Medicine, The First Hospital of Jilin University, Jilin University, Changchun, Jilin, 130021, China.,Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun, 130062, China
| | - Guizhen Wang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun, 130062, China.,College of Food Engineering, Jilin Engineering Normal University, Changchun, China
| | - Meng Li
- Department of Respiratory Medicine, The First Hospital of Jilin University, Jilin University, Changchun, Jilin, 130021, China.,Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun, 130062, China
| | - Li Li
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun, 130062, China
| | - Hongtao Liu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun, 130062, China
| | - Meiyang Sun
- Department of Breast Surgery, Jilin Provincial Cancer Hospital, Changchun, China
| | - Zhongmei Wen
- Department of Respiratory Medicine, The First Hospital of Jilin University, Jilin University, Changchun, Jilin, 130021, China.
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20
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Romero-Diaz C, Campos SM, Herrmann MA, Lewis KN, Williams DR, Soini HA, Novotny MV, Hews DK, Martins EP. Structural Identification, Synthesis and Biological Activity of Two Volatile Cyclic Dipeptides in a Terrestrial Vertebrate. Sci Rep 2020; 10:4303. [PMID: 32152427 PMCID: PMC7062908 DOI: 10.1038/s41598-020-61312-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 02/24/2020] [Indexed: 11/22/2022] Open
Abstract
Single substances within complex vertebrate chemical signals could be physiologically or behaviourally active. However, the vast diversity in chemical structure, physical properties and molecular size of semiochemicals makes identifying pheromonally active compounds no easy task. Here, we identified two volatile cyclic dipeptides, cyclo(L-Leu-L-Pro) and cyclo(L-Pro-L-Pro), from the complex mixture of a chemical signal in terrestrial vertebrates (lizard genus Sceloporus), synthesised one of them and investigated their biological activity in male intra-specific communication. In a series of behavioural trials, lizards performed more chemosensory behaviour (tongue flicks, lip smacks and substrate lickings) when presented with the synthesised cyclo(L-Pro-L-Pro) chemical blend, compared to the controls, the cyclo(L-Leu-L-Pro) blend, or a combined blend with both cyclic dipeptides. The results suggest a potential semiochemical role of cyclo(L-Pro-L-Pro) and a modulating effect of cyclo(L-Leu-L-Pro) that may depend on the relative concentration of both compounds in the chemical signal. In addition, our results stress how minor compounds in complex mixtures can produce a meaningful behavioural response, how small differences in structural design are crucial for biological activity, and highlight the need for more studies to determine the complete functional landscape of biologically relevant compounds.
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Affiliation(s)
| | - Stephanie M Campos
- Department of Biology and Center for the Integrative Study of Animal Behavior, Indiana University, Bloomington, IN, 47405, USA.,Center for Behavioral Neuroscience, Neuroscience Institute, Georgia State University, Atlanta, GA, 30303, USA
| | - Morgan A Herrmann
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - Kristen N Lewis
- Department of Chemistry, Indiana University, Bloomington, IN, 47405, USA
| | - David R Williams
- Department of Chemistry, Indiana University, Bloomington, IN, 47405, USA
| | - Helena A Soini
- Department of Chemistry, Indiana University, Bloomington, IN, 47405, USA.,Institute for Pheromone Research, Indiana University, Bloomington, IN, 47405, USA
| | - Milos V Novotny
- Department of Chemistry, Indiana University, Bloomington, IN, 47405, USA.,Institute for Pheromone Research, Indiana University, Bloomington, IN, 47405, USA
| | - Diana K Hews
- Department of Biology, Indiana State University, Terre Haute, IN, 47809, USA
| | - Emília P Martins
- School of Life Sciences, Arizona State University, Tempe, AZ, 85287, USA
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21
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Othoum G, Prigent S, Derouiche A, Shi L, Bokhari A, Alamoudi S, Bougouffa S, Gao X, Hoehndorf R, Arold ST, Gojobori T, Hirt H, Lafi FF, Nielsen J, Bajic VB, Mijakovic I, Essack M. Comparative genomics study reveals Red Sea Bacillus with characteristics associated with potential microbial cell factories (MCFs). Sci Rep 2019; 9:19254. [PMID: 31848398 PMCID: PMC6917714 DOI: 10.1038/s41598-019-55726-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 11/27/2019] [Indexed: 02/07/2023] Open
Abstract
Recent advancements in the use of microbial cells for scalable production of industrial enzymes encourage exploring new environments for efficient microbial cell factories (MCFs). Here, through a comparison study, ten newly sequenced Bacillus species, isolated from the Rabigh Harbor Lagoon on the Red Sea shoreline, were evaluated for their potential use as MCFs. Phylogenetic analysis of 40 representative genomes with phylogenetic relevance, including the ten Red Sea species, showed that the Red Sea species come from several colonization events and are not the result of a single colonization followed by speciation. Moreover, clustering reactions in reconstruct metabolic networks of these Bacillus species revealed that three metabolic clades do not fit the phylogenetic tree, a sign of convergent evolution of the metabolism of these species in response to special environmental adaptation. We further showed Red Sea strains Bacillus paralicheniformis (Bac48) and B. halosaccharovorans (Bac94) had twice as much secreted proteins than the model strain B. subtilis 168. Also, Bac94 was enriched with genes associated with the Tat and Sec protein secretion system and Bac48 has a hybrid PKS/NRPS cluster that is part of a horizontally transferred genomic region. These properties collectively hint towards the potential use of Red Sea Bacillus as efficient protein secreting microbial hosts, and that this characteristic of these strains may be a consequence of the unique ecological features of the isolation environment.
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Affiliation(s)
- G Othoum
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - S Prigent
- Department of Biology and Biological Engineering, Division of Systems & Synthetic Biology, Chalmers University of Technology, Kemivägen 10, 41296, Gothenburg, Sweden
| | - A Derouiche
- Department of Biology and Biological Engineering, Division of Systems & Synthetic Biology, Chalmers University of Technology, Kemivägen 10, 41296, Gothenburg, Sweden
| | - L Shi
- Department of Biology and Biological Engineering, Division of Systems & Synthetic Biology, Chalmers University of Technology, Kemivägen 10, 41296, Gothenburg, Sweden
| | - A Bokhari
- Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - S Alamoudi
- Department of Biology, Science and Arts College, King Abdulaziz University, Rabigh, 21589, Kingdom of Saudi Arabia
| | - S Bougouffa
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - X Gao
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - R Hoehndorf
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - S T Arold
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - T Gojobori
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.,Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - H Hirt
- Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - F F Lafi
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.,College of Natural and Health Sciences, Zayed University, 144534, Abu-Dhabi, United Arab Emirates
| | - J Nielsen
- Department of Biology and Biological Engineering, Division of Systems & Synthetic Biology, Chalmers University of Technology, Kemivägen 10, 41296, Gothenburg, Sweden.,Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800, Lyngby, Denmark.,Science for Life Laboratory, Royal Institute of Technology, Solna, Sweden
| | - V B Bajic
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - I Mijakovic
- Department of Biology and Biological Engineering, Division of Systems & Synthetic Biology, Chalmers University of Technology, Kemivägen 10, 41296, Gothenburg, Sweden. .,Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800, Lyngby, Denmark.
| | - M Essack
- Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
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22
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Alexpandi R, Prasanth MI, Ravi AV, Balamurugan K, Durgadevi R, Srinivasan R, De Mesquita JF, Pandian SK. Protective effect of neglected plant Diplocyclos palmatus on quorum sensing mediated infection of Serratia marcescens and UV-A induced photoaging in model Caenorhabditis elegans. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 201:111637. [PMID: 31706086 DOI: 10.1016/j.jphotobiol.2019.111637] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 08/22/2019] [Accepted: 09/22/2019] [Indexed: 02/07/2023]
Abstract
Plants are considered to be a leading source for possible human therapeutic agents. This holistic study has investigated the anti-quorum sensing (anti-QS), anti-infection, antioxidant and anti-photoaging properties of neglected plant Diplocyclos palmatus. The results showed that D. palmatus methanolic leaf extract (DPME) effectively inhibited the quorum sensing (QS) regulated virulence factor production as well as biofilm formation in Serratia marcescens. The transcriptomic analysis revealed that DPME significantly downed the expression of QS-regulated genes such as fimA, fimC, flhC, bsmB, pigP and shlA in S. marcescens, which supports the outcome of in vitro bioassays. Further, the docking study revealed that the presence of active compounds, namely tocopherols and phytol, DPME exhibited its anti-QS activity against S. marcescens. In addition, DPME treatment extended the lifespan of S. marcescens infected C. elegans by the action of dropping the internal accumulation. Further, qPCR analysis clearly revealed that DPME treatment significantly up-regulated the expression of the lifespan-related gene (daf-16) and immune-related genes (clec-60, clec-87, lys-7 and bec-1) in S. marcescens infected C.elegans. On the other hand, DPME extensively reduced the UV-A induced ROS stress, thereby, extended the lifespan in UV-A photoaged C. elegans. Further, the qPCR analysis also confirmed the up-regulation of daf-16, clec-60, clec-87 and col-19 genes which advocated the improvement of the lifespan, healthspan and collagen production in UV-A photoaged C. elegans. Further bioassays evidenced that that the lifespan extension of photoaged C. elegans was accomplished by the actions of antioxidants such as tocopherols and phytol in DPME.
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Affiliation(s)
- Rajaiah Alexpandi
- Department of Biotechnology, School of Biological Sciences, Science Campus, Alagappa University, Karaikudi 630 003, India
| | - Mani Iyer Prasanth
- Department of Biotechnology, School of Biological Sciences, Science Campus, Alagappa University, Karaikudi 630 003, India; Age-Related Inflammation and Degeneration Research Unit, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Arumugam Veera Ravi
- Department of Biotechnology, School of Biological Sciences, Science Campus, Alagappa University, Karaikudi 630 003, India.
| | - Krishnaswamy Balamurugan
- Department of Biotechnology, School of Biological Sciences, Science Campus, Alagappa University, Karaikudi 630 003, India
| | - Ravindran Durgadevi
- Department of Biotechnology, School of Biological Sciences, Science Campus, Alagappa University, Karaikudi 630 003, India
| | - Ramanathan Srinivasan
- Department of Biotechnology, School of Biological Sciences, Science Campus, Alagappa University, Karaikudi 630 003, India; Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350 002, PR China; Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University), Fujian Province University, Fuzhou 350 002, PR China
| | - Joelma Freire De Mesquita
- Department of Genetics and Molecular Biology, Federal University of Rio de Janeiro State (UNIRIO), Rio de Janeiro, Brazil
| | - Shunmugiah Karutha Pandian
- Department of Biotechnology, School of Biological Sciences, Science Campus, Alagappa University, Karaikudi 630 003, India
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Kgk D, Kumari S, G S, Malla RR. Marine natural compound cyclo(L-leucyl-L-prolyl) peptide inhibits migration of triple negative breast cancer cells by disrupting interaction of CD151 and EGFR signaling. Chem Biol Interact 2019; 315:108872. [PMID: 31669320 DOI: 10.1016/j.cbi.2019.108872] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 09/30/2019] [Accepted: 10/21/2019] [Indexed: 12/14/2022]
Abstract
Cyclo (L-Leucyl-L-Prolyl) peptide/CLP is a marine natural metabolite and well recognized as an antimicrobial and antioxidant agent with limited studies on anticancer activity. The current study aims to determine the effect of CLP on migration and growth of triple negative breast cancer cell lines. The anti-growth potential was evaluated by MTT, BrdU and TUNEL assays; DNA damage by γH2AX and Dead green assays; antimigration activity by Boyden chamber invasion and wound healing assays. Interaction of CLP with CD151 was resolved by PatchDock. Effect of CLP on the expression of transmembrane CD151 was evaluated by cell-based ELISA assay. The interaction between CD151 and EGFR was predicted by using FireDoc Web server. Impact of CLP on the interaction of CD151 with EGFR was evaluated by co-immunoprecipitation assay. The effect of CLP on the cell cycle and its controlling proteins was determined by Western blotting. CLP reduced the viability of MDA-MB-231 and MDA-MB-468 TNBC cell lines but not human breast healthy epithelial cell line (MCF-12A) similar to eribulin, standard. CLP also inhibited proliferation; cell cycle and migration. It induced DNA strand breaks, DNA damage, and cell death. It showed the most favorable interactions with CD151 in in silico docking and significantly reduced the expression of membrane-bound CD151 proteins. FireDoc Web study predicted the association between CD151 and EGFR with -29.13 kcal/mol of binding energy. CLP reduced the interaction of CD151 with EGFR along with the expression of cyclin D, CDK4, PAK, RAC1, and P27kiP1. This study concludes that CLP suppresses growth and migration by attenuating cell cycle of TNBC cell lines via EGFR and CD151 signaling. Thus, exploring the EGFR and CD151 signaling pathway targeted by CLP may provide a new approach in the treatment of TNBC.
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Affiliation(s)
- Deepak Kgk
- Cancer Biology Lab, Department of Biochemistry, GIS, GITAM (Deemed to be University), Visakhapatnam, 530045, Andhra Pradesh, India
| | - Seema Kumari
- Cancer Biology Lab, Department of Biochemistry, GIS, GITAM (Deemed to be University), Visakhapatnam, 530045, Andhra Pradesh, India
| | - Shailender G
- Cancer Biology Lab, Department of Biochemistry, GIS, GITAM (Deemed to be University), Visakhapatnam, 530045, Andhra Pradesh, India
| | - Rama Rao Malla
- Cancer Biology Lab, Department of Biochemistry, GIS, GITAM (Deemed to be University), Visakhapatnam, 530045, Andhra Pradesh, India.
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Valliammai A, Sethupathy S, Priya A, Selvaraj A, Bhaskar JP, Krishnan V, Pandian SK. 5-Dodecanolide interferes with biofilm formation and reduces the virulence of Methicillin-resistant Staphylococcus aureus (MRSA) through up regulation of agr system. Sci Rep 2019; 9:13744. [PMID: 31551455 PMCID: PMC6760239 DOI: 10.1038/s41598-019-50207-y] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 08/30/2019] [Indexed: 12/20/2022] Open
Abstract
Methicillin resistant Staphylococcus aureus (MRSA) is a predominant human pathogen with high morbidity that is listed in the WHO high priority pathogen list. Being a primary cause of persistent human infections, biofilm forming ability of S. aureus plays a pivotal role in the development of antibiotic resistance. Hence, targeting biofilm is an alternative strategy to fight bacterial infections. The present study for the first time demonstrates the non-antibacterial biofilm inhibitory efficacy of 5-Dodecanolide (DD) against ATCC strain and clinical isolates of S. aureus. In addition, DD is able to inhibit adherence of MRSA on human plasma coated Titanium surface. Further, treatment with DD significantly reduced the eDNA synthesis, autoaggregation, staphyloxanthin biosynthesis and ring biofilm formation. Reduction in staphyloxanthin in turn increased the susceptibility of MRSA to healthy human blood and H2O2 exposure. Quantitative PCR analysis revealed the induced expression of agrA and agrC upon DD treatment. This resulted down regulation of genes involved in biofilm formation such as fnbA and fnbB and up regulation of RNAIII, hld, psmα and genes involved in biofilm matrix degradation such as aur and nuc. Inefficacy of DD on the biofilm formation of agr mutant further validated the agr mediated antibiofilm potential of DD. Notably, DD was efficient in reducing the in vivo colonization of MRSA in Caenorhabditis elegans. Results of gene expression studies and physiological assays unveiled the agr mediated antibiofilm efficacy of DD.
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Affiliation(s)
- Alaguvel Valliammai
- Department of Biotechnology, Alagappa University, Science Campus, Karaikudi, 630003, Tamil Nadu, India
| | - Sivasamy Sethupathy
- Department of Biotechnology, Alagappa University, Science Campus, Karaikudi, 630003, Tamil Nadu, India
- School of Chemical Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea
| | - Arumugam Priya
- Department of Biotechnology, Alagappa University, Science Campus, Karaikudi, 630003, Tamil Nadu, India
| | - Anthonymuthu Selvaraj
- Department of Biotechnology, Alagappa University, Science Campus, Karaikudi, 630003, Tamil Nadu, India
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Quorum Sensing Inhibition by Marine Bacteria. Mar Drugs 2019; 17:md17070427. [PMID: 31340463 PMCID: PMC6669520 DOI: 10.3390/md17070427] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 07/18/2019] [Accepted: 07/19/2019] [Indexed: 01/05/2023] Open
Abstract
Antibiotic resistance has been increasingly reported for a wide variety of bacteria of clinical significance. This widespread problem constitutes one of the greatest challenges of the twenty-first century. Faced with this issue, clinicians and researchers have been persuaded to design novel strategies in order to try to control pathogenic bacteria. Therefore, the discovery and elucidation of the mechanisms underlying bacterial pathogenesis and intercellular communication have opened new perspectives for the development of alternative approaches. Antipathogenic and/or antivirulence therapies based on the interruption of quorum sensing pathways are one of several such promising strategies aimed at disarming rather than at eradicating bacterial pathogens during the course of colonization and infection. This review describes mechanisms of bacterial communication involved in biofilm formation. An overview of the potential of marine bacteria and their bioactive components as QS inhibitors is further provided.
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Rubini D, Banu SF, Subramani P, Hari BNV, Gowrishankar S, Pandian SK, Wilson A, Nithyanand P. Extracted chitosan disrupts quorum sensing mediated virulence factors in Urinary tract infection causing pathogens. Pathog Dis 2019; 77:5364546. [PMID: 30801640 DOI: 10.1093/femspd/ftz009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 02/22/2019] [Indexed: 02/06/2023] Open
Abstract
Quorum sensing (QS) plays an important role during the aetiology of urinary tract infection (UTI), as several virulence factors are under the regulation of QS. Pseudomonas aeruginosa and Serratia marcescens, the primary causative agents of UTI, employ acyl homoserine lactone (AHL) as signal molecules to coordinate various virulence factors. In this present study, chitosan extracted from the marine crab Portunus sanguinolentus was screened for its ability to inhibit the QS-signaling molecules of P. aeruginosa (PA01) and few clinical isolates of P. aeruginosa and S. marcescens. The extracted chitosan on comparison with a commercial chitosan showed significant inhibition of several QS-dependent virulence factors in P. aeruginosa and S. marscenes. Furthermore, qPCR analysis was carried out to confirm the down-regulation of fimA, fimC and flhD genes involved in adhesion and pathogenesis of S. marcescens and lasI and rhlI genes that governs the P. aeruginosa quorum sensing system. Moreover, the chitosan when coated on a catheter was also able to disrupt the mature biofilms which was revealed by scanning electron microscopy. Collectively, the present study showcases the QS inhibitory property of extracted chitosan from crab shells which is being discarded as a recalcitrant biowaste.
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Affiliation(s)
- Durairajan Rubini
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
| | - Sanaulla Farisa Banu
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
| | - Prabha Subramani
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
| | - B Narayanan Vedha Hari
- Department of Pharmacy, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Shanmugaraj Gowrishankar
- Department of Biotechnology, Alagappa University, Science Campus, Karaikudi - 630004, Tamil Nadu, India
| | | | - Aruni Wilson
- Division of Microbiology and Molecular Genetics, School of Medicine, 11021 Campus Street, Loma Linda, California 92350, USA
| | - Paramasivam Nithyanand
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
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27
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Brevinin-2 Drug Family—New Applied Peptide Candidates Against Methicillin-Resistant Staphylococcus aureus and Their Effects on Lys-7 Expression of Innate Immune Pathway DAF-2/DAF-16 in Caenorhabditis elegans. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8122627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The issue of Staphylococcus aureus (MRSA) developing a resistance to drugs such as methicillin has long been the focus for new drug development. In recent years, antimicrobial peptides, such as small molecular peptides with broad-spectrum antibacterial activity and special antibacterial mechanism, have shown a strong medicinal potential. In particular, the Brevinin-2 family has been shown to have a significant inhibitory effect against gram-positive bacteria (G+). In this study, we researched the influence of MRSA on the behavior and survival rate of nematodes. We established an assay of Caenorhabditis elegans–MRSA antimicrobial peptides to screen for new potent anti-infective peptides against MRSA. From the Brevinin-2 family, 13 peptides that had shown strong effects on G+ were screened for their ability to prolong the lifespan of infected worms. Real-time Polymerase Chain Reaction (PCR) tests were used to evaluate the effect on the innate immune pathway dauer formation defective (DAF)-2/DAF-16 of C. elegans. The assay successfully screened and filtered out four of the 13 peptides that significantly improved the survival rate of MRSA-infected worms. The result of real-time PCR indicated that the mRNA and protein expression levels of lys-7 were consistently upregulated by being treated with four of the Brevinin-2 family. The Brevinin-2 family peptides, including Brevinin-2, Brevinin-2-OA3, Brevinin-2ISb, and Brevinin-2TSa, also played an active role in the DAF-2/DAF-16 pathway in C. elegans. We successfully demonstrated the utility of anti-infective peptides that prolong the survival rate of the MRSA-infected host and discovered the relationship between antibacterial peptides and the innate immune system of C. elegans. We demonstrated the antimicrobial effects of Brevinin-2 family peptides, indicating their potential for use as new drug candidates against MRSA infections.
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Quorum quelling efficacy of marine cyclic dipeptide -cyclo(L-leucyl-L-prolyl) against the uropathogen Serratia marcescens. Food Chem Toxicol 2018; 123:326-336. [PMID: 30419322 DOI: 10.1016/j.fct.2018.11.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 10/16/2018] [Accepted: 11/06/2018] [Indexed: 11/23/2022]
Abstract
In the current study, the anti-quorum sensing (QS) efficacy of cyclic dipeptide -cyclo(L-leucyl-L-prolyl) (CLP) of marine origin was explored against Serratia marcescens. Minimal -inhibitory (MIC) and -bactericidal concentrations (MBC) of CLP against both reference as well as a clinical isolate of S. marcescens was identified to be 200 and 400 µg/mL, respectively. CLP proficiently inhibited the QS controlled prodigiosin production in S. marcescens, which affirm its anti-QS efficacy towards S. marcescens. At sub-MIC (100 µg/mL), CLP exhibited a phenomenal inhibitory propensity towards the production of virulence traits viz. biofilm, exopolymeric substance, protease and lipase to the level of 81, 77, 71 and 92%, respectively. Further, the confocal and scanning electron microscopic analyses validated the antibiofilm efficacy of CLP. Besides, CLP effectively modified the hydrophobic and motility characteristics of S. marcescens. Furthermore, the in vivo assay using C. elegans revealed the non-toxic and anti-adherence propensity of CLP. Concomitantly, the down regulation of QS controlled virulence genes (unveiled through qPCR analysis) are in accordance with the data of phenotypic and in vivo assays. Therefore, this study exemplifies that CLP could plausibly be a convincing alternative over conventional antibiotics in preventing the QS associated pathogenesis of uropathogens.
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Santhakumari S, Jayakumar R, Logalakshmi R, Prabhu NM, Abdul Nazar AK, Karutha Pandian S, Veera Ravi A. In vitro and in vivo effect of 2,6-Di-tert-butyl-4-methylphenol as an antibiofilm agent against quorum sensing mediated biofilm formation of Vibrio spp. Int J Food Microbiol 2018; 281:60-71. [DOI: 10.1016/j.ijfoodmicro.2018.05.024] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 05/17/2018] [Accepted: 05/22/2018] [Indexed: 11/16/2022]
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Mashima I, Miyakawa H, Scannapieco FA, Nakazawa F. Identification of an early stage biofilm inhibitor from Veillonella tobetsuensis. Anaerobe 2018; 52:86-91. [PMID: 29908228 DOI: 10.1016/j.anaerobe.2018.06.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 06/07/2018] [Accepted: 06/11/2018] [Indexed: 10/28/2022]
Abstract
Oral biofilm, the cause of dental caries and periodontal diseases, consists of multiple bacterial species. Streptococcus spp. and Veillonella spp. have been reported as to be initial and early colonizers of oral biofilms. Our previous studies showed that Veillonella tobetsuensis may play an important role on the development of S. gordonii biofilms without coaggregation involving extracellular biomolecules. In this study, the effect of a cyclic dipeptide autoinducer from culture supernatants from V. tobetsuensis at late-exponential growth phase on S. gordonii biofilm was examined. The cyclic dipeptide, identified as cyclo (-L-Leu-L-Pro) by gas chromatography/mass spectrometry, inhibited the development of S. gordonii biofilm. Furthermore, cyclo (-L-Leu-L-Pro) appeared not to cause bactericidal effects on planktonic cells of S. gordonii. This is the first report that oral Veillonella produces cyclo (-L-Leu-L-Pro) in their culture supernatants. Moreover, the results of this study suggest that cyclo (-L-Leu-L-Pro) may have an application to inhibit early stage development of oral biofilms.
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Affiliation(s)
- Izumi Mashima
- Postdoctoral Fellow of Japan Society for the Promotion of Science, 5-3-1, Kouji-machi, Chiyoda-ku, Tokyo 102-0083, Japan; Department of Oral Biology, School of Dental Medicine, University at Buffalo, The State University of New York, 3435 Main Street, Foster Hall, Buffalo, NY 14214, USA; Department of Microbiology, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan
| | - Hiroshi Miyakawa
- Department of Microbiology, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan
| | - Frank A Scannapieco
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, The State University of New York, 3435 Main Street, Foster Hall, Buffalo, NY 14214, USA
| | - Futoshi Nakazawa
- Department of Microbiology, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.
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Sivaranjani M, Srinivasan R, Aravindraja C, Karutha Pandian S, Veera Ravi A. Inhibitory effect of α-mangostin on Acinetobacter baumannii biofilms - an in vitro study. BIOFOULING 2018; 34:579-593. [PMID: 29869541 DOI: 10.1080/08927014.2018.1473387] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Accepted: 05/03/2018] [Indexed: 06/08/2023]
Abstract
The present study was designed to investigate the anti-biofilm potential of alpha-mangostin (α-MG) against Acinetobacter baumannii (AB). The biofilm inhibitory concentration (BIC) of α-MG against AB was found to be 2 μg ml-1. α-MG (0.5, 1 and 2 μg ml-1) exhibited non-bactericidal concentration-dependent anti-biofilm activities against AB. However, α-MG failed to disintegrate the mature biofilms of AB even at a 10-fold increased concentration from its BIC. Results from qRT-PCR and in vitro bioassays further demonstrated that α-MG downregulated the expression of bfmR, pgaA, pgaC, csuA/B, ompA, bap, katE, and sodB genes, which correspondingly affects biofilm formation and its associated virulence traits. The present study suggests that α-MG exerts its anti-biofilm property by interrupting initial biofilm formation and the cell-to-cell signaling mechanism of AB. Additional studies are required to understand the mode of action responsible for the anti-biofilm property.
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Rajalaxmi M, Beema Shafreen R, Chithiraiselvi K, Karutha Pandian S. An in vitro and in silico identification of antibiofilm small molecules from seawater metaclone SWMC166 against Vibrio cholerae O1. Mol Cell Probes 2018; 39:14-24. [PMID: 29574083 DOI: 10.1016/j.mcp.2018.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 03/06/2018] [Accepted: 03/20/2018] [Indexed: 01/27/2023]
Abstract
This study aimed to determine the antibiofilm activity of seawater microbes against Vibrio cholerae (VCO1) through functional metagenomics approach. A metagenomic library was constructed from Palk Bay seawater and the library was screened to identify the biofilm inhibitory metaclone. Metaclone SWMC166 (harbouring ∼30 kb metagenomic insert) was found to exhibit antibiofilm activity against VCO1. The biofilm inhibitory potential of partially purified ethyl acetate extract of SWMC166 (EA166) was further evaluated through microscopic studies and biochemical assays. Further, EA166 treated VCO1 divulged up-regulation of genes involved in high cell density-mediated quorum sensing (QS) pathway which was analysed by real-time PCR. In order to identify the genes of interest (within ∼30 kb insert), subcloning was performed through shotgun approach. Small molecules from positive subclones SC5 and SC8 were identified through HRLC-MS analysis. Resulted small molecules were docked against QS receptors of V. cholerae to identify the bioactive metabolites. Docking studies revealed that totally seven metabolites were able to interact with QS receptors that can possibly trigger the QS cascade and sequentially inhibit the biofilm formation and virulence factors of VCO1.
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Affiliation(s)
- Murugan Rajalaxmi
- Department of Biotechnology, Alagappa University, Science Campus, Karaikudi, 630 003, India
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Satish L, Santhakumari S, Gowrishankar S, Pandian SK, Ravi AV, Ramesh M. Rapid biosynthesized AgNPs from Gelidiella acerosa aqueous extract mitigates quorum sensing mediated biofilm formation of Vibrio species-an in vitro and in vivo approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:27254-27268. [PMID: 28965300 DOI: 10.1007/s11356-017-0296-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 09/20/2017] [Indexed: 06/07/2023]
Abstract
The present study explores the non-bactericidal anti-virulence efficacy of green synthesized silver nanoparticles (AgNPs) from Gelidiella acerosa against multi-drug resistant Vibrio spp. Spectral characterization of AgNPs was performed through UV-Visible, FT-IR, and energy-dispersive spectroscopic techniques followed by X-ray crystallography and zeta potential analysis. Further, the structural characterization was done by electron and atomic force microscopic techniques. AgNPs profoundly quelled the quorum sensing mediated violacein production in Chromobacterium violaceum and CV026. Characterized AgNPs at 100 μg mL-1 concentrations depicted a phenomenal anti-biofilm efficacy against Vibrio parahaemolyticus (71%) and Vibrio vulnificus (83%) biofilms, which was further confirmed through light, confocal, and scanning electron microscopic analyses. In vitro bioassays revealed the remarkable inhibitory values of AgNPs, by inhibiting the exopolysaccharide production, hydrophobicity, and motility. In vivo studies using Artemia franciscana larvae also confirmed the anti-infective proficiency, as the AgNPs effectively reduced the bacterial colonization and enhanced the survival rate of larvae up to 100% without any toxicity effect. Graphical abstract Rapid biosynthesized AgNPs from Gelidiella acerosa quench quorum sensing controlled virulence traits in vibrios.
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Affiliation(s)
- Lakkakula Satish
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, 630 003, India
- Department of Biotechnology Engineering, Ben-Gurion University of Nagev, Beer Sheva, 84105, Israel
| | | | - Shanmugaraj Gowrishankar
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, 630 003, India
| | | | - Arumugam Veera Ravi
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, 630 003, India
| | - Manikandan Ramesh
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, 630 003, India.
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Santhakumari S, Nilofernisha NM, Ponraj JG, Pandian SK, Ravi AV. In vitro and in vivo exploration of palmitic acid from Synechococcus elongatus as an antibiofilm agent on the survival of Artemia franciscana against virulent vibrios. J Invertebr Pathol 2017; 150:21-31. [PMID: 28887169 DOI: 10.1016/j.jip.2017.09.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 08/02/2017] [Accepted: 09/05/2017] [Indexed: 10/18/2022]
Abstract
Biofilm formation of Vibrio spp. has been demonstrated as a potentially important mechanism contributing antibiotic treatment failure in aquaculture. In the present study, the effect of palmitic acid (PA) identified from Synechococcus elongatus was assessed for the inhibition of quorum sensing (QS) regulated biofilm formation in aquatic bacterial pathogens. The biofilm inhibitory concentration (BIC) of PA against Vibrio spp. was found to be 100µgml-1. In this concentration, PA exhibited a significant inhibition in biofilm biomass of Vibrio harveyi MTCC 3438, V. parahaemolyticus ATCC 17802, V. vulnificus MTCC 1145 and V. alginolyticus ATCC 17749 without hindering their planktonic growth. Also, PA displayed gradual decrease in bioluminescence production of V. harveyi. The results of extracellular polymeric substances quantification, microbial adhesion to hydrocarbons and Fourier transform infrared spectroscopic (FT-IR) analyses suggested that PA positively interferes with the initial adhesion stages of biofilm formation. In addition, confocal and scanning electron microscopic analysis substantiates the antibiofilm efficacy of the PA. The transcriptomic analysis revealed the down-regulation of QS mediated response regulator genes expression in V. harveyi. Concomitantly, PA reduced the intestinal colonization of vibrios in brine shrimp larvae and thereby attenuates the biofilm assemblage and its associated virulence. In vivo studies using brine shrimp larvae manifested the reduction in adherence and virulence, which prompts further investigation about the potential of PA for the treatment of vibriosis.
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Affiliation(s)
| | | | - Jeyaraj Godfred Ponraj
- TIL Biosciences - Animal Health Division of Tablets (India) Limited, Jhaver Centre, Egmore, Chennai 600 008, Tamil Nadu, India
| | | | - Arumugam Veera Ravi
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi 630 003, Tamil Nadu, India.
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Goswami S, Sarkar R, Saha P, Maity A, Sarkar T, Das D, Chakraborty PD, Bandyopadhyay S, Ghosh CK, Karmakar S, Sen T. Effect of human placental extract in the management of biofilm mediated drug resistance - A focus on wound management. Microb Pathog 2017; 111:307-315. [PMID: 28867635 DOI: 10.1016/j.micpath.2017.08.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 08/23/2017] [Accepted: 08/30/2017] [Indexed: 12/13/2022]
Abstract
Management of infectious wounds, particularly chronic wounds and burn injuries, is a matter of global concern. Worldwide estimates reveal that, billions of dollars are being spent annually for the management of such chronic ailments. Evidently, bacterial biofilms pose a greater problem in the effective management of infection in chronic wounds, since most of the currently available antibiotics are unable to act on the microorganisms residing inside the protected environment of the biofilms. Accordingly, in the present study, we have attempted to evaluate the anti-biofilm properties of human placental extract (PLX) and also other virulence factors that are mediated via the quorum sensing (QS) signalling system. PLX is well known for its anti inflammatory action and it has been shown earlier some anti microbial and enzymatic activity also. PLX was found to produce significant inhibition of biofilm formation and also decreased the levels of pyoverdin and pyocyanin. The microscopic analysis (both light microscopy and atomic force microscopy) of biofilms was also used for substantiating the findings from spectrophotometric (crystal violet estimation) and fluorescence analysis (resazurin uptake). PLX pre-treatment decreased the hydrophobicity of gram-positive and gram negative cells, indicating the effect of placental extract on adherence property of planktonic cell, serving as an indicator for its antibiofilm effect on microorganisms. The reduced extracellular DNA (eDNA) content in biofilm matrix following treatment with PLX also indicates the effectiveness of placenta extract on bacterial adherence, which in turn serves as evidence substantiating the antibiofilm effects of the PLX. Furthermore, PLX was also found to be significantly effective in the in vitro wound biofilm model. Thus the present study, the first of its kind with PLX, establishes the therapeutic benefit of the same particularly in infected wounds, opening up newer avenue for further exploration.
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Affiliation(s)
- Sutapa Goswami
- Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India; Albert David Ltd., Kolkata 700001, India.
| | - Ratul Sarkar
- Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
| | - Pritam Saha
- Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
| | - Amit Maity
- Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
| | - Tridib Sarkar
- Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
| | - Debmalya Das
- School of Material Science and Nanotechnology, Jadavpur University, Kolkata 700032, India
| | | | | | - Chandan Kumar Ghosh
- School of Material Science and Nanotechnology, Jadavpur University, Kolkata 700032, India
| | - Sanmoy Karmakar
- Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India; Bioequivalence Study Center, Jadavpur University, Kolkata 700032, India
| | - Tuhinadri Sen
- Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
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Belbahri L, Chenari Bouket A, Rekik I, Alenezi FN, Vallat A, Luptakova L, Petrovova E, Oszako T, Cherrad S, Vacher S, Rateb ME. Comparative Genomics of Bacillus amyloliquefaciens Strains Reveals a Core Genome with Traits for Habitat Adaptation and a Secondary Metabolites Rich Accessory Genome. Front Microbiol 2017; 8:1438. [PMID: 28824571 PMCID: PMC5541019 DOI: 10.3389/fmicb.2017.01438] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Accepted: 07/17/2017] [Indexed: 12/04/2022] Open
Abstract
The Gram positive, non-pathogenic endospore-forming soil inhabiting prokaryote Bacillus amyloliquefaciens is a plant growth-promoting rhizobacterium. Bacillus amyloliquefaciens processes wide biocontrol abilities and numerous strains have been reported to suppress diverse bacterial, fungal and fungal-like pathogens. Knowledge about strain level biocontrol abilities is warranted to translate this knowledge into developing more efficient biocontrol agents and bio-fertilizers. Ever-expanding genome studies of B. amyloliquefaciens are showing tremendous increase in strain-specific new secondary metabolite clusters which play key roles in the suppression of pathogens and plant growth promotion. In this report, we have used genome mining of all sequenced B. amyloliquefaciens genomes to highlight species boundaries, the diverse strategies used by different strains to promote plant growth and the diversity of their secondary metabolites. Genome composition of the targeted strains suggest regions of genomic plasticity that shape the structure and function of these genomes and govern strain adaptation to different niches. Our results indicated that B. amyloliquefaciens: (i) suffer taxonomic imprecision that blurs the debate over inter-strain genome diversity and dynamics, (ii) have diverse strategies to promote plant growth and development, (iii) have an unlocked, yet to be delimited impressive arsenal of secondary metabolites and products, (iv) have large number of so-called orphan gene clusters, i.e., biosynthetic clusters for which the corresponding metabolites are yet unknown, and (v) have a dynamic pan genome with a secondary metabolite rich accessory genome.
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Affiliation(s)
- Lassaad Belbahri
- Laboratory of Soil Biology, University of NeuchatelNeuchatel, Switzerland.,NextBiotechAgareb, Tunisia
| | - Ali Chenari Bouket
- NextBiotechAgareb, Tunisia.,Graduate School of Life and Environmental Sciences, Osaka Prefecture UniversitySakai, Japan.,Young Researchers and Elite Club, Tabriz Branch, Islamic Azad UniversityTabriz, Iran
| | | | | | - Armelle Vallat
- Neuchâtel Platform of Analytical Chemistry, Institute of Chemistry, University of NeuchâtelNeuchâtel, Switzerland
| | - Lenka Luptakova
- NextBiotechAgareb, Tunisia.,Department of Biology and Genetics, Institute of Biology, Zoology and Radiobiology, University of Veterinary Medicine and PharmacyKosice, Slovakia
| | - Eva Petrovova
- Institute of Anatomy, University of Veterinary Medicine and PharmacyKosice, Slovakia
| | | | | | | | - Mostafa E Rateb
- School of Science and Sport, University of the West of ScotlandPaisley, United Kingdom
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Srinivasan R, Santhakumari S, Ravi AV. In vitro antibiofilm efficacy of Piper betle against quorum sensing mediated biofilm formation of luminescent Vibrio harveyi. Microb Pathog 2017; 110:232-239. [PMID: 28687321 DOI: 10.1016/j.micpath.2017.07.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/13/2017] [Accepted: 07/03/2017] [Indexed: 12/19/2022]
Abstract
Vibrio harveyi is a potent biofilm former, which confers resistance to multiple antimicrobials, disinfectants, chemicals and biocides. The prevalence of biofilm mediated antibiotic resistance among aquatic bacterial pathogens stresses the search for novel alternative approach to treat vibriosis in aquaculture. Exploring suitable therapeutics from natural resources could be a novel area of research. Therefore, this work was executed to evaluate the inhibitory effect of Piper betle ethyl acetate extract (PBE) on bioluminescence production and biofilm formation of V. harveyi. Minimal inhibitory concentration (MIC) of PBE against planktonic V. harveyi was found to be 1600 μg ml-1; furthermore, PBE inhibited the quorum sensing (QS) mediated bioluminescence production and biofilm formation in V. harveyi upto 98 and 74% respectively, at its sub-MIC concentration of 400 μg ml-1 without affecting their cell viability. Similar results were obtained for exopolysaccharides production and swimming motility related to biofilm formation of V. harveyi, where PBE reduced EPS production upto 64%. Light and confocal laser scanning microscopic analyses further confirmed that the PBE effectively prevented the initial attachment as well as microcolonies formation of V. harveyi biofilm, when compared to their untreated controls. This study demonstrates the promising antibiofilm activity of PBE and confirms the ethnopharmacological potential of this plant against V. harveyi infections.
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Affiliation(s)
- Ramanathan Srinivasan
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, 630 003, Tamil Nadu, India
| | | | - Arumugam Veera Ravi
- Department of Biotechnology, Science Campus, Alagappa University, Karaikudi, 630 003, Tamil Nadu, India.
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Isolation and Structure Identification of Novel Brominated Diketopiperazines from Nocardia ignorata-A Lichen-Associated Actinobacterium. Molecules 2017; 22:molecules22030371. [PMID: 28264516 PMCID: PMC6155340 DOI: 10.3390/molecules22030371] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 02/22/2017] [Accepted: 02/23/2017] [Indexed: 11/26/2022] Open
Abstract
Actinobacteria are well known for their potential in biotechnology and their production of metabolites of interest. Lichens are a promising source of new bacterial strains, especially Actinobacteria, which afford a broad chemical diversity. In this context, the culture medium of the actinobacterium Nocardia ignorata, isolated from the terrestrial lichen Collema auriforme, was studied. The strain was cultivated in a BioFlo 115 bioreactor, and the culture medium was extracted using an XAD7HP resin. Five known diketopiperazines: cyclo (l-Pro-l-OMet) (1), cyclo (l-Pro-l-Tyr) (2), cyclo (d-Pro-l-Tyr) (3), cyclo (l-Pro-l-Val) (4), cyclo (l-Pro-l-Leu) (5), and one auxin derivative: indole-carboxaldehyde (8) were isolated, along with two new brominated diketopiperazines: cyclo (d-Pro-l-Br-Tyr) (6) and cyclo (l-Pro-l-Br-Tyr) (7). Structure elucidation was performed using HRMS and 1D and 2D NMR analysis, and the synthesis of compounds 6 and 7 was carried out in order to confirm their structure.
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