1
|
Sadiq FA, De Reu K, Steenackers H, Van de Walle A, Burmølle M, Heyndrickx M. Dynamic social interactions and keystone species shape the diversity and stability of mixed-species biofilms - an example from dairy isolates. ISME Commun 2023; 3:118. [PMID: 37968339 PMCID: PMC10651889 DOI: 10.1038/s43705-023-00328-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 10/28/2023] [Accepted: 11/02/2023] [Indexed: 11/17/2023]
Abstract
Identifying interspecies interactions in mixed-species biofilms is a key challenge in microbial ecology and is of paramount importance given that interactions govern community functionality and stability. We previously reported a bacterial four-species biofilm model comprising Stenotrophomonas rhizophila, Bacillus licheniformis, Microbacterium lacticum, and Calidifontibacter indicus that were isolated from the surface of a dairy pasteuriser after cleaning and disinfection. These bacteria produced 3.13-fold more biofilm mass compared to the sum of biofilm masses in monoculture. The present study confirms that the observed community synergy results from dynamic social interactions, encompassing commensalism, exploitation, and amensalism. M. lacticum appears to be the keystone species as it increased the growth of all other species that led to the synergy in biofilm mass. Interactions among the other three species (in the absence of M. lacticum) also contributed towards the synergy in biofilm mass. Biofilm inducing effects of bacterial cell-free-supernatants were observed for some combinations, revealing the nature of the observed synergy, and addition of additional species to dual-species combinations confirmed the presence of higher-order interactions within the biofilm community. Our findings provide understanding of bacterial interactions in biofilms which can be used as an interaction-mediated approach for cultivating, engineering, and designing synthetic bacterial communities.
Collapse
Affiliation(s)
- Faizan Ahmed Sadiq
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium.
| | - Koen De Reu
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Hans Steenackers
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, 3001, Leuven, Belgium
| | - Ann Van de Walle
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Mette Burmølle
- Section of Microbiology, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark
| | - Marc Heyndrickx
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium.
- Ghent University, Department of Pathobiology, Pharmacology and Zoological Medicine, Salisburylaan 133, B-9820, Merelbeke, Belgium.
| |
Collapse
|
2
|
Podnar E, Erega A, Danevčič T, Kovačec E, Lories B, Steenackers H, Mandic-Mulec I. Nutrient Availability and Biofilm Polysaccharide Shape the Bacillaene-Dependent Antagonism of Bacillus subtilis against Salmonella Typhimurium. Microbiol Spectr 2022; 10:e0183622. [PMID: 36342318 PMCID: PMC9769773 DOI: 10.1128/spectrum.01836-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 10/18/2022] [Indexed: 11/09/2022] Open
Abstract
Salmonella enterica is one of the most common foodborne pathogens and, due to the spread of antibiotic resistance, new antimicrobial strategies are urgently needed to control it. In this study, we explored the probiotic potential of Bacillus subtilis PS-216 and elucidated the mechanisms that underlie the interactions between this soil isolate and the model pathogenic strain S. Typhimurium SL1344. The results reveal that B. subtilis PS-216 inhibits the growth and biofilm formation of S. Typhimurium through the production of the pks cluster-dependent polyketide bacillaene. The presence of S. Typhimurium enhanced the activity of the PpksC promoter that controls bacillaene production, suggesting that B. subtilis senses and responds to Salmonella. The level of Salmonella inhibition, overall PpksC activity, and PpksC induction by Salmonella were all higher in nutrient-rich conditions than in nutrient-depleted conditions. Although eliminating the extracellular polysaccharide production of B. subtilis via deletion of the epsA-O operon had no significant effect on inhibitory activity against Salmonella in nutrient-rich conditions, this deletion mutant showed an enhanced antagonism against Salmonella in nutrient-depleted conditions, revealing an intricate relationship between exopolysaccharide production, nutrient availability, and bacillaene synthesis. Overall, this work provides evidence on the regulatory role of nutrient availability, sensing of the competitor, and EpsA-O polysaccharide in the social outcome of bacillaene-dependent competition between B. subtilis and S. Typhimurium. IMPORTANCE Probiotic bacteria represent an alternative for controlling foodborne disease caused by Salmonella enterica, which constitutes a serious concern during food production due to its antibiotic resistance and resilience to environmental stress. Bacillus subtilis is gaining popularity as a probiotic, but its behavior in biofilms with pathogens such as Salmonella remains to be elucidated. Here, we show that the antagonism of B. subtilis is mediated by the polyketide bacillaene and that the production of bacillaene is a highly dynamic trait which depends on environmental factors such as nutrient availability and the presence of competitors. Moreover, the production of extracellular polysaccharides by B. subtilis further alters the influence of these factors. Hence, this work highlights the inhibitory effect of B. subtilis, which is condition-dependent, and the importance of evaluating probiotic strains under conditions relevant to the intended use.
Collapse
Affiliation(s)
- Eli Podnar
- Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Andi Erega
- Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Tjaša Danevčič
- Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Eva Kovačec
- Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Bram Lories
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Hans Steenackers
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Leuven, Belgium
| | - Ines Mandic-Mulec
- Department of Microbiology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
- Chair of Microprocess Engineering and Technology (COMPETE), University of Ljubljana, Ljubljana, Slovenia
| |
Collapse
|
3
|
Pertusati F, Pileggi E, Richards J, Wootton M, Van Leemputte T, Persoons L, De Coster D, Villanueva X, Daelemans D, Steenackers H, McGuigan C, Serpi M. Drug repurposing: phosphate prodrugs of anticancer and antiviral FDA-approved nucleosides as novel antimicrobials. J Antimicrob Chemother 2021; 75:2864-2878. [PMID: 32688391 DOI: 10.1093/jac/dkaa268] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 05/09/2020] [Accepted: 05/15/2020] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES Following a drug repurposing approach, we aimed to investigate and compare the antibacterial and antibiofilm activities of different classes of phosphate prodrugs (HepDirect, cycloSal, SATE and mix SATE) of antiviral and anticancer FDA-approved nucleoside drugs [zidovudine (AZT), floxouridine (FUDR) and gemcitabine (GEM)] against a variety of pathogenic Gram-positive and -negative bacteria. METHODS Ten prodrugs were synthesized and screened for antibacterial activity against seven Gram-negative and two Gram-positive isolates fully susceptible to traditional antibiotics, alongside six Gram-negative and five Gram-positive isolates with resistance mechanisms. Their ability to prevent and eradicate biofilms of different bacterial pathogens in relation to planktonic growth inhibition was also evaluated, together with their effect on proliferation, viability and apoptosis of different eukaryotic cells. RESULTS The prodrugs showed decreased antibacterial activity compared with the parent nucleosides. cycloSal-GEM-monophosphate (MP) prodrugs 20a and 20b were the most active agents against Gram-positive bacteria (Enterococcus faecalis and Staphylococcus aureus) and retained their activity against antibiotic-resistant isolates. cycloSal-FUDR-MP 21a partially retained good activity against the Gram-positive bacteria E. faecalis, Enterococcus faecium and S. aureus. Most of the prodrugs tested displayed very potent preventive antibiofilm specific activity, but not curative. In terms of cytotoxicity, AZT prodrugs did not affect apoptosis or cell viability at the highest concentration tested, and only weak effects on apoptosis and/or cell viability were observed for GEM and FUDR prodrugs. CONCLUSIONS Among the different prodrug approaches, the cycloSal prodrugs appeared the most effective. In particular, cycloSal (17a) and mix SATE (26) AZT prodrugs combine the lowest cytotoxicity with high and broad antibacterial and antibiofilm activity against Gram-negative bacteria.
Collapse
Affiliation(s)
- Fabrizio Pertusati
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| | - Elisa Pileggi
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| | - Jennifer Richards
- Public Health Wales Microbiology Cardiff, University Hospital of Wales, Heath Park, Cardiff CF14 4XW, UK
| | - Mandy Wootton
- Public Health Wales Microbiology Cardiff, University Hospital of Wales, Heath Park, Cardiff CF14 4XW, UK
| | - Thijs Van Leemputte
- Centre of Microbial and Plant Genetics, Kasteelpark Arenberg 20, bus 2460, B-3001 Leuven, Belgium
| | - Leentje Persoons
- Department of Microbiology, Immunology and Transplantation, Laboratory of Virology and Chemotherapy, Rega Institute for Medical Research, KU Leuven, Herestraat 49-box 1043, Leuven 3000, Belgium
| | - David De Coster
- Centre of Microbial and Plant Genetics, Kasteelpark Arenberg 20, bus 2460, B-3001 Leuven, Belgium
| | - Xabier Villanueva
- Centre of Microbial and Plant Genetics, Kasteelpark Arenberg 20, bus 2460, B-3001 Leuven, Belgium
| | - Dirk Daelemans
- Department of Microbiology, Immunology and Transplantation, Laboratory of Virology and Chemotherapy, Rega Institute for Medical Research, KU Leuven, Herestraat 49-box 1043, Leuven 3000, Belgium
| | - Hans Steenackers
- Centre of Microbial and Plant Genetics, Kasteelpark Arenberg 20, bus 2460, B-3001 Leuven, Belgium
| | - Christopher McGuigan
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| | - Michaela Serpi
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| |
Collapse
|
4
|
Maes S, De Reu K, Van Weyenberg S, Lories B, Heyndrickx M, Steenackers H. Pseudomonas putida as a potential biocontrol agent against Salmonella Java biofilm formation in the drinking water system of broiler houses. BMC Microbiol 2020; 20:373. [PMID: 33308162 PMCID: PMC7731557 DOI: 10.1186/s12866-020-02046-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 11/19/2020] [Indexed: 11/18/2022] Open
Abstract
Background Environmental biofilms can induce attachment and protection of other microorganisms including pathogens, but can also prevent them from invasion and colonization. This opens the possibility for so-called biocontrol strategies, wherein microorganisms are applied to control the presence of other microbes. The potential for both positive and negative interactions between microbes, however, raises the need for in depth characterization of the sociobiology of candidate biocontrol agents (BCAs). The inside of the drinking water system (DWS) of broiler houses is an interesting niche to apply BCAs, because contamination of these systems with pathogens plays an important role in the infection of broiler chickens and consequently humans. In this study, Pseudomonas putida, which is part of the natural microbiota in the DWS of broiler houses, was evaluated as BCA against the broiler pathogen Salmonella Java. Results To study the interaction between these species, an in vitro model was developed simulating biofilm formation in the drinking water system of broilers. Dual-species biofilms of P. putida strains P1, P2, and P3 with S. Java were characterized by competitive interactions, independent of P. putida strain, S. Java inoculum density and application order. When equal inocula of S. Java and P. putida strains P1 or P3 were simultaneously applied, the interaction was characterized by mutual inhibition, whereas P. putida strain P2 showed an exploitation of S. Java. Lowering the inoculum density of S. Java changed the interaction with P. putida strain P3 also into an exploitation of S. Java. A further increase in S. Java inhibition was established by P. putida strain P3 forming a mature biofilm before applying S. Java. Conclusions This study provides the first results showing the potential of P. putida as BCA against S. Java in the broiler environment. Future work should include more complex microbial communities residing in the DWS, additional Salmonella strains as well as chemicals typically used to clean and disinfect the system. Supplementary Information The online version contains supplementary material available at 10.1186/s12866-020-02046-5.
Collapse
Affiliation(s)
- Sharon Maes
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Koen De Reu
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Stephanie Van Weyenberg
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Bram Lories
- Faculty of Bioscience Engineering, Department of Microbial and Molecular Systems (M2S), Centre of Microbial and Plant Genetics (CMPG), University of Leuven, Kasteelpark Arenberg 20 box 2460, 3001, Leuven, Belgium
| | - Marc Heyndrickx
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium.,Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
| | - Hans Steenackers
- Faculty of Bioscience Engineering, Department of Microbial and Molecular Systems (M2S), Centre of Microbial and Plant Genetics (CMPG), University of Leuven, Kasteelpark Arenberg 20 box 2460, 3001, Leuven, Belgium.
| |
Collapse
|
5
|
Maes S, Vackier T, Nguyen Huu S, Heyndrickx M, Steenackers H, Sampers I, Raes K, Verplaetse A, De Reu K. Occurrence and characterisation of biofilms in drinking water systems of broiler houses. BMC Microbiol 2019; 19:77. [PMID: 30987581 PMCID: PMC6466764 DOI: 10.1186/s12866-019-1451-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 04/02/2019] [Indexed: 11/29/2022] Open
Abstract
Background Water quality in the drinking water system (DWS) plays an important role in the general health and performance of broiler chickens. Conditions in the DWS of broilers are ideal for microbial biofilm formation. Since pathogens might reside within these biofilms, they serve as potential source of waterborne transmission of pathogens to livestock and humans. Knowledge about the presence, importance and composition of biofilms in the DWS of broilers is largely missing. In this study, we therefore aim to monitor the occurrence, and chemically and microbiologically characterise biofilms in the DWS of five broiler farms. Results The bacterial load after disinfection in DWSs was assessed by sampling with a flocked swab followed by enumerations of total aerobic flora (TAC) and Pseudomonas spp. The dominant flora was identified and their biofilm-forming capacity was evaluated. Also, proteins, carbohydrates and uronic acids were quantified to analyse the presence of extracellular polymeric substances of biofilms. Despite disinfection of the water and the DWS, average TAC was 6.03 ± 1.53 log CFU/20cm2. Enumerations for Pseudomonas spp. were on average 0.88 log CFU/20cm2 lower. The most identified dominant species from TAC were Stenotrophomonas maltophilia, Pseudomonas geniculata and Pseudomonas aeruginosa. However at species level, most of the identified microorganisms were farm specific. Almost all the isolates belonging to the three most abundant species were strong biofilm producers. Overall, 92% of all tested microorganisms were able to form biofilm under lab conditions. Furthermore, 63% of the DWS surfaces appeared to be contaminated with microorganisms combined with at least one of the analysed chemical components, which is indicative for the presence of biofilm. Conclusions Stenotrophomonas maltophilia, Pseudomonas geniculata and Pseudomonas aeruginosa are considered as opportunistic pathogens and could consequently be a potential risk for animal health. Additionally, the biofilm-forming capacity of these organisms could promote attachment of other pathogens such as Campylobacter spp. and Salmonella spp. Electronic supplementary material The online version of this article (10.1186/s12866-019-1451-5) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Sharon Maes
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Thijs Vackier
- Faculty of Engineering Technology, Department of Microbial and Molecular Systems (M2S), Cluster for Bioengineering Technology (CBeT), Laboratory of Enzyme, Fermentation and Brewery Technology, University of Leuven, Gebroeders De Smetstraat 1, 9000, Ghent, Belgium
| | - Son Nguyen Huu
- Faculty of Bioscience Engineering, Department of Industrial Biological Sciences, Ghent University Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500, Kortrijk, Belgium
| | - Marc Heyndrickx
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium.,Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
| | - Hans Steenackers
- Faculty of Bioscience Engineering, Department of Microbial and Molecular Systems (M2S), Centre of Microbial and Plant Genetics (CMPG), University of Leuven, Kasteelpark Arenberg 20 box 2460, 3001, Leuven, Belgium
| | - Imca Sampers
- Faculty of Bioscience Engineering, Department of Industrial Biological Sciences, Ghent University Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500, Kortrijk, Belgium
| | - Katleen Raes
- Faculty of Bioscience Engineering, Department of Industrial Biological Sciences, Ghent University Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500, Kortrijk, Belgium
| | - Alex Verplaetse
- Faculty of Engineering Technology, Department of Microbial and Molecular Systems (M2S), Cluster for Bioengineering Technology (CBeT), Laboratory of Enzyme, Fermentation and Brewery Technology, University of Leuven, Gebroeders De Smetstraat 1, 9000, Ghent, Belgium
| | - Koen De Reu
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090, Melle, Belgium.
| |
Collapse
|
6
|
Maes S, Heyndrickx M, Vackier T, Steenackers H, Verplaetse A, Reu KDE. Identification and Spoilage Potential of the Remaining Dominant Microbiota on Food Contact Surfaces after Cleaning and Disinfection in Different Food Industries. J Food Prot 2019; 82:262-275. [PMID: 30682263 DOI: 10.4315/0362-028x.jfp-18-226] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
After cleaning and disinfection (C&D), surface contamination can still be present in the production environment of food companies. Microbiological contamination on cleaned surfaces can be transferred to the manufactured food and consequently lead to foodborne illness and early food spoilage. However, knowledge about the microbiological composition of residual contamination after C&D and the effect of this contamination on food spoilage is lacking in various food sectors. In this study, we identified the remaining dominant microbiota on food contact surfaces after C&D in seven food companies and assessed the spoilage potential of the microbiota under laboratory conditions. The dominant microbiota on surfaces contaminated at ≥102 CFU/100 cm2 after C&D was identified based on 16S rRNA sequences. The ability of these microorganisms to hydrolyze proteins, lipids, and phospholipids, ferment glucose and lactose, produce hydrogen sulfide, and degrade starch and gelatin also was evaluated. Genera that were most abundant among the dominant microbiota on food contact surfaces after C&D were Pseudomonas, Microbacterium, Stenotrophomonas, Staphylococcus, and Streptococcus. Pseudomonas spp. were identified in five of the participating food companies, and 86.8% of the isolates evaluated had spoilage potential in the laboratory tests. Microbacterium and Stenotrophomonas spp. were identified in five and six of the food companies, respectively, and all tested isolates had spoilage potential. This information will be useful for food companies in their quest to characterize surface contamination after C&D, to identify causes of microbiological food contamination and spoilage, and to determine the need for more thorough C&D.
Collapse
Affiliation(s)
- Sharon Maes
- 1 Flanders Research Institute for Agriculture, Fisheries and Food, Technology and Food Science Unit, Brusselsesteenweg 370, 9090 Melle, Belgium
| | - Marc Heyndrickx
- 1 Flanders Research Institute for Agriculture, Fisheries and Food, Technology and Food Science Unit, Brusselsesteenweg 370, 9090 Melle, Belgium.,2 Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Thijs Vackier
- 3 Laboratory of Enzyme, Fermentation and Brewery Technology, Cluster for Bioengineering Technology, Department of Microbial and Molecular Systems, Faculty of Engineering Technology, University of Leuven, Gebroeders De Smetstraat 1, 9000 Ghent, Belgium
| | - Hans Steenackers
- 4 Centre of Microbial and Plant Genetics, Department of Microbial and Molecular Systems, Faculty of Bioscience Engineering, University of Leuven, Kasteelpark Arenberg 20 Box 2460, 3001 Leuven, Belgium
| | - Alex Verplaetse
- 3 Laboratory of Enzyme, Fermentation and Brewery Technology, Cluster for Bioengineering Technology, Department of Microbial and Molecular Systems, Faculty of Engineering Technology, University of Leuven, Gebroeders De Smetstraat 1, 9000 Ghent, Belgium
| | - Koen DE Reu
- 1 Flanders Research Institute for Agriculture, Fisheries and Food, Technology and Food Science Unit, Brusselsesteenweg 370, 9090 Melle, Belgium
| |
Collapse
|
7
|
Spacova I, Lievens E, Verhoeven T, Steenackers H, Vanderleyden J, Lebeer S, Petrova MI. Expression of fluorescent proteins in Lactobacillus rhamnosus to study host-microbe and microbe-microbe interactions. Microb Biotechnol 2018; 11:317-331. [PMID: 29027368 PMCID: PMC5812243 DOI: 10.1111/1751-7915.12872] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 08/12/2017] [Accepted: 08/25/2017] [Indexed: 12/28/2022] Open
Abstract
Probiotic Lactobacillus strains are widely used to benefit human and animal health, although the exact mechanisms behind their interactions with the host and the microbiota are largely unknown. Fluorescent tagging of live probiotic cells is an important tool to unravel their modes of action. In this study, the implementation of different heterologously expressed fluorescent proteins for the labelling of the model probiotic strains Lactobacillus rhamnosusGG (gastrointestinal) and Lactobacillus rhamnosusGR-1 (vaginal) was explored. Heterologous expression of mTagBFP2 and mCherry resulted in long-lasting fluorescence of L. rhamnosusGG and GR-1 cells, using the nisin-controlled expression (NICE) system. These novel fluorescent strains were then used to study in vitro aspects of their microbe-microbe and microbe-host interactions. Lactobacillus rhamnosusGG and L. rhamnosusGR-1 expressing mTagBFP2 and mCherry could be visualized in mixed-species biofilms, where they inhibited biofilm formation by Salmonella Typhimurium-gfpmut3 expressing the green fluorescent protein. Likewise, fluorescent L. rhamnosusGG and L. rhamnosusGR-1 were implemented for the visualization of their adhesion patterns to intestinal epithelial cell cultures. The fluorescent L. rhamnosus strains developed in this study can therefore serve as novel tools for the study of probiotic interactions with their environment.
Collapse
Affiliation(s)
- Irina Spacova
- Centre of Microbial and Plant GeneticsKU LeuvenHeverleeBelgium
- Department of Bioscience EngineeringUniversity of AntwerpAntwerpBelgium
| | - Elke Lievens
- Centre of Microbial and Plant GeneticsKU LeuvenHeverleeBelgium
- Department of Bioscience EngineeringUniversity of AntwerpAntwerpBelgium
| | - Tine Verhoeven
- Centre of Microbial and Plant GeneticsKU LeuvenHeverleeBelgium
| | | | | | - Sarah Lebeer
- Centre of Microbial and Plant GeneticsKU LeuvenHeverleeBelgium
- Department of Bioscience EngineeringUniversity of AntwerpAntwerpBelgium
| | - Mariya I. Petrova
- Centre of Microbial and Plant GeneticsKU LeuvenHeverleeBelgium
- Department of Bioscience EngineeringUniversity of AntwerpAntwerpBelgium
| |
Collapse
|
8
|
Goikoetxea E, Routkevitch D, de Weerdt A, Green JJ, Steenackers H, Braeken D. Impedimetric Fingerprinting and Structural Analysis of Isogenic E.coli Biofilms using Multielectrode Arrays. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.3698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
9
|
Qing X, De Weerdt A, De Maeyer M, Steenackers H, Voet A. Rational design of small molecules that modulate the transcriptional function of the response regulator PhoP. Biochem Biophys Res Commun 2018; 495:375-381. [DOI: 10.1016/j.bbrc.2017.11.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 11/06/2017] [Indexed: 12/18/2022]
|
10
|
Goikoetxea E, Lopez Sandoval R, Steenackers H, Braeken D. Structural characterization and disinfection assessment of isogenic E.coli biofilms using impedance spectroscopy with microelectrode arrays. Front Cell Neurosci 2018. [DOI: 10.3389/conf.fncel.2018.38.00090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
11
|
Maes S, Huu SN, Heyndrickx M, Weyenberg SV, Steenackers H, Verplaetse A, Vackier T, Sampers I, Raes K, Reu KD. Evaluation of Two Surface Sampling Methods for Microbiological and Chemical Analyses To Assess the Presence of Biofilms in Food Companies. J Food Prot 2017; 80:2022-2028. [PMID: 29140744 DOI: 10.4315/0362-028x.jfp-17-210] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Biofilms are an important source of contamination in food companies, yet the composition of biofilms in practice is still mostly unknown. The chemical and microbiological characterization of surface samples taken after cleaning and disinfection is very important to distinguish free-living bacteria from the attached bacteria in biofilms. In this study, sampling methods that are potentially useful for both chemical and microbiological analyses of surface samples were evaluated. In the manufacturing facilities of eight Belgian food companies, surfaces were sampled after cleaning and disinfection using two sampling methods: the scraper-flocked swab method and the sponge stick method. Microbiological and chemical analyses were performed on these samples to evaluate the suitability of the sampling methods for the quantification of extracellular polymeric substance components and microorganisms originating from biofilms in these facilities. The scraper-flocked swab method was most suitable for chemical analyses of the samples because the material in these swabs did not interfere with determination of the chemical components. For microbiological enumerations, the sponge stick method was slightly but not significantly more effective than the scraper-flocked swab method. In all but one of the facilities, at least 20% of the sampled surfaces had more than 102 CFU/100 cm2. Proteins were found in 20% of the chemically analyzed surface samples, and carbohydrates and uronic acids were found in 15 and 8% of the samples, respectively. When chemical and microbiological results were combined, 17% of the sampled surfaces were contaminated with both microorganisms and at least one of the analyzed chemical components; thus, these surfaces were characterized as carrying biofilm. Overall, microbiological contamination in the food industry is highly variable by food sector and even within a facility at various sampling points and sampling times.
Collapse
Affiliation(s)
- Sharon Maes
- 1 Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Brusselsesteenweg 370, 9090 Melle, Belgium
| | - Son Nguyen Huu
- 2 Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University-Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium
| | - Marc Heyndrickx
- 1 Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Brusselsesteenweg 370, 9090 Melle, Belgium.,3 Department of Pathology, Bacteriology and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Stephanie van Weyenberg
- 1 Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Brusselsesteenweg 370, 9090 Melle, Belgium
| | - Hans Steenackers
- 4 Centre of Microbial and Plant Genetics, Department of Microbial and Molecular Systems, Faculty of Bioscience Engineering, University of Leuven, Kasteelpark Arenberg 20 Box 2460, 3001 Leuven, Belgium; and
| | - Alex Verplaetse
- 5 Laboratory of Enzyme, Fermentation and Brewery Technology, Cluster for Bioengineering Technology, Department of Microbial and Molecular Systems, Faculty of Engineering Technology, University of Leuven, Gebroeders De Smetstraat 1, 9000 Ghent, Belgium
| | - Thijs Vackier
- 5 Laboratory of Enzyme, Fermentation and Brewery Technology, Cluster for Bioengineering Technology, Department of Microbial and Molecular Systems, Faculty of Engineering Technology, University of Leuven, Gebroeders De Smetstraat 1, 9000 Ghent, Belgium
| | - Imca Sampers
- 2 Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University-Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium
| | - Katleen Raes
- 2 Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University-Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium
| | - Koen De Reu
- 1 Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Brusselsesteenweg 370, 9090 Melle, Belgium
| |
Collapse
|
12
|
Qing XY, Steenackers H, Venken T, De Maeyer M, Voet A. Computational Studies of the Active and Inactive Regulatory Domains of Response Regulator PhoP Using Molecular Dynamics Simulations. Mol Inform 2017; 36. [PMID: 28598557 DOI: 10.1002/minf.201700031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 05/30/2017] [Indexed: 12/25/2022]
Abstract
The response regulator PhoP is part of the PhoP/PhoQ two-component system, which is responsible for regulating the expression of multiple genes involved in controlling virulence, biofilm formation, and resistance to antimicrobial peptides. Therefore, modulating the transcriptional function of the PhoP protein is a promising strategy for developing new antimicrobial agents. There is evidence suggesting that phosphorylation-mediated dimerization in the regulatory domain of PhoP is essential for its transcriptional function. Disruption or stabilization of protein-protein interactions at the dimerization interface may inhibit or enhance the expression of PhoP-dependent genes. In this study, we performed molecular dynamics simulations on the active and inactive dimers and monomers of the PhoP regulatory domains, followed by pocket-detecting screenings and a quantitative hot-spot analysis in order to assess the druggability of the protein. Consistent with prior hypothesis, the calculation of the binding free energy shows that phosphorylation enhances dimerization of PhoP. Furthermore, we have identified two different putative binding sites at the dimerization active site (the α4-β5-α5 face) with energetic "hot-spot" areas, which could be used to search for modulators of protein-protein interactions. This study delivers insight into the dynamics and druggability of the dimerization interface of the PhoP regulatory domain, and may serve as a basis for the rational identification of new antimicrobial drugs.
Collapse
Affiliation(s)
- Xiao-Yu Qing
- Laboratory for Biomolecular Modelling, and Laboratory for Biomolecular Modelling and design, the Chemistry Department, KULeuven, Celestijnenlaan 200G-bus2403, Heverlee, Belgium
| | - Hans Steenackers
- Centre of Microbial and Plant Genetics, KULeuven, Kasteelpark Arenberg 20-bus2460, Belgium
| | - Tom Venken
- Flemish Institute for Technological Research, VITO, Boeretang 200, 2400, MOL, Belgium
| | - Marc De Maeyer
- Laboratory for Biomolecular Modelling, and Laboratory for Biomolecular Modelling and design, the Chemistry Department, KULeuven, Celestijnenlaan 200G-bus2403, Heverlee, Belgium
| | - Arnout Voet
- Laboratory for Biomolecular Modelling, and Laboratory for Biomolecular Modelling and design, the Chemistry Department, KULeuven, Celestijnenlaan 200G-bus2403, Heverlee, Belgium
| |
Collapse
|
13
|
Mishra NM, Briers Y, Lamberigts C, Steenackers H, Robijns S, Landuyt B, Vanderleyden J, Schoofs L, Lavigne R, Luyten W, Van der Eycken EV. Evaluation of the antibacterial and antibiofilm activities of novel CRAMP-vancomycin conjugates with diverse linkers. Org Biomol Chem 2016; 13:7477-86. [PMID: 26068402 DOI: 10.1039/c5ob00830a] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We report the design, synthesis and antibacterial activity analysis of conjugates of vancomycin and cathelicidin-related antimicrobial peptides (CRAMP). Vancomycin inhibits the nascent peptidoglycan synthesis and is highly active against Gram-positive bacteria, whereas Gram-negative bacteria are generally insensitive due to a protective outer membrane. CRAMP is known to translocate across the Gram-negative outer membrane by a self-promoted uptake mechanism. Vancomycin-CRAMP conjugates were synthesized using click chemistry with diverse hydrophilic and hydrophobic linkers, with CRAMP functioning as a carrier peptide for the transfer of vancomycin through the outer membrane. Small hydrophobic linkers with an aromatic group result in the most active conjugates against planktonic Gram-negative bacteria, while maintaining the high activity of vancomycin against Gram-positive bacteria. These conjugates thus show a broad-spectrum activity, which is absent in CRAMP or vancomycin alone, and which is strongly improved compared to an equimolar mixture of CRAMP and vancomycin. In addition, these conjugates also show a strong inhibitory activity against S. Typhimurium biofilm formation.
Collapse
Affiliation(s)
- Nigam M Mishra
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Abstract
During the last decade it has been shown that among cell variation in gene expression plays an important role within clonal populations. Here, we provide an overview of the different mechanisms contributing to gene expression variability in clonal populations. These are ranging from inherent variations in the biochemical process of gene expression itself, such as intrinsic noise, extrinsic noise and bistability to individual responses to variations in the local micro-environment, a phenomenon called phenotypic plasticity. Also genotypic variations caused by clonal evolution and phase variation can contribute to gene expression variability. Consequently, gene expression studies need to take these fluctuations in expression into account. However, frequently used techniques for expression quantification, such as microarrays, RNA sequencing, quantitative PCR and gene reporter fusions classically determine the population average of gene expression. Here, we discuss how these techniques can be adapted towards single cell analysis by integration with single cell isolation, RNA amplification and microscopy. Alternatively more qualitative selection-based techniques, such as mutant screenings, in vivo expression technology (IVET) and recombination-based IVET (RIVET) can be applied for detection of genes expressed only within a subpopulation. Finally, differential fluorescence induction (DFI), a protocol specially designed for single cell expression is discussed.
Collapse
Affiliation(s)
- Stefanie Roberfroid
- a Department of Microbial and Molecular Systems , Centre of Microbial and Plant Genetics, KU Leuven , Leuven , Belgium
| | - Jos Vanderleyden
- a Department of Microbial and Molecular Systems , Centre of Microbial and Plant Genetics, KU Leuven , Leuven , Belgium
| | - Hans Steenackers
- a Department of Microbial and Molecular Systems , Centre of Microbial and Plant Genetics, KU Leuven , Leuven , Belgium
| |
Collapse
|
15
|
Pulido-Tamayo S, Sánchez-Rodríguez A, Swings T, Van den Bergh B, Dubey A, Steenackers H, Michiels J, Fostier J, Marchal K. Frequency-based haplotype reconstruction from deep sequencing data of bacterial populations. Nucleic Acids Res 2015; 43:e105. [PMID: 25990729 PMCID: PMC4652744 DOI: 10.1093/nar/gkv478] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 04/29/2015] [Indexed: 11/23/2022] Open
Abstract
Clonal populations accumulate mutations over time, resulting in different haplotypes. Deep sequencing of such a population in principle provides information to reconstruct these haplotypes and the frequency at which the haplotypes occur. However, this reconstruction is technically not trivial, especially not in clonal systems with a relatively low mutation frequency. The low number of segregating sites in those systems adds ambiguity to the haplotype phasing and thus obviates the reconstruction of genome-wide haplotypes based on sequence overlap information. Therefore, we present EVORhA, a haplotype reconstruction method that complements phasing information in the non-empty read overlap with the frequency estimations of inferred local haplotypes. As was shown with simulated data, as soon as read lengths and/or mutation rates become restrictive for state-of-the-art methods, the use of this additional frequency information allows EVORhA to still reliably reconstruct genome-wide haplotypes. On real data, we show the applicability of the method in reconstructing the population composition of evolved bacterial populations and in decomposing mixed bacterial infections from clinical samples.
Collapse
Affiliation(s)
- Sergio Pulido-Tamayo
- Department of Information Technology, Ghent University, iMinds, 9050 Gent, Belgium Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
| | - Aminael Sánchez-Rodríguez
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium Departamento de Ciencias Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto S/N, EC1101608 Loja, Ecuador
| | - Toon Swings
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium
| | - Bram Van den Bergh
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium
| | - Akanksha Dubey
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium
| | - Hans Steenackers
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium
| | - Jan Michiels
- Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium
| | - Jan Fostier
- Department of Information Technology, Ghent University, iMinds, 9050 Gent, Belgium
| | - Kathleen Marchal
- Department of Information Technology, Ghent University, iMinds, 9050 Gent, Belgium Department of Microbial and Molecular Systems, Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
| |
Collapse
|
16
|
Steenackers H, Dubey A, Robijns S, Ermolat'ev D, Delattin N, Dovgan B, Girandon L, Fröhlich M, De Brucker K, Cammue BPA, Thevissen K, Balzarini J, Van der Eycken EV, Vanderleyden J. Evaluation of the toxicity of 5-aryl-2-aminoimidazole-based biofilm inhibitors against eukaryotic cell lines, bone cells and the nematode Caenorhabditis elegans. Molecules 2014; 19:16707-23. [PMID: 25325155 PMCID: PMC6271933 DOI: 10.3390/molecules191016707] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/22/2014] [Accepted: 09/15/2014] [Indexed: 01/19/2023] Open
Abstract
Previously, we have synthesized several series of compounds based on the 5-aryl-2-aminoimidazole scaffold, which showed a preventive activity against microbial biofilms. We here studied the cytotoxicity of the most active compounds of each series. First, the cytostatic activity was investigated against a number of tumor cell lines (L1210, CEM and HeLa). A subset of monosubstituted 5-aryl-2-aminoimidazoles showed a moderate safety window, with therapeutic indices (TIs) ranging between 3 and 20. Whereas introduction of a (cyclo-)alkyl chain at the N1-position strongly reduced the TI, introduction of a (cyclo-)alkyl chain or a triazole moiety at the 2N-position increased the TI up to 370. Since a promising application of preventive anti-biofilm agents is their use in anti-biofilm coatings for orthopedic implants, their effects on cell viability and functional behavior of human osteoblasts and bone marrow derived mesenchymal stem cells were tested. The 2N-substituted 5-aryl-2-aminoimidazoles consistently showed the lowest toxicity and allowed survival of the bone cells for up to 4 weeks. Moreover they did not negatively affect the osteogenic differentiation potential of the bone cells. Finally, we examined the effect of the compounds on the survival of Caenorhabditis elegans, which confirmed the higher safety window of 2N-substituted 5-aryl-2-aminoimidazoles.
Collapse
Affiliation(s)
- Hans Steenackers
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium.
| | - Akanksha Dubey
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium
| | - Stijn Robijns
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium
| | - Denis Ermolat'ev
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Nicolas Delattin
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium
| | | | | | | | - Katrijn De Brucker
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium
| | - Bruno P A Cammue
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium
| | - Karin Thevissen
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium
| | - Jan Balzarini
- Laboratory of Virology and Chemotherapy, Rega Institute for Medical Research, Department of Microbiology and Immunology, KU Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium
| | - Erik V Van der Eycken
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Jozef Vanderleyden
- Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 20, Box 2460, B-3001 Leuven, Belgium
| |
Collapse
|
17
|
Steenackers H, Ermolat'ev D, Trang TTT, Savalia B, Sharma UK, De Weerdt A, Shah A, Vanderleyden J, Van der Eycken EV. Microwave-assisted one-pot synthesis and anti-biofilm activity of 2-amino-1H-imidazole/triazole conjugates. Org Biomol Chem 2014; 12:3671-8. [DOI: 10.1039/c3ob42282h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A microwave-assisted protocol was developed for the construction of 2-amino-1H-imidazole/triazole conjugates with anti-biofilm activity.
Collapse
Affiliation(s)
- Hans Steenackers
- Centre of Microbial and Plant Genetics (CMPG)
- Department of Microbial and Molecular Systems
- KU Leuven
- B-3001 Leuven, Belgium
| | - Denis Ermolat'ev
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
| | - Tran Thi Thu Trang
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
| | - Bharat Savalia
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
- Department of Chemistry
| | - Upendra K. Sharma
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
| | - Ami De Weerdt
- Centre of Microbial and Plant Genetics (CMPG)
- Department of Microbial and Molecular Systems
- KU Leuven
- B-3001 Leuven, Belgium
| | - Anamik Shah
- Department of Chemistry
- Saurashtra University
- 361 005 Rajkot, India
| | - Jozef Vanderleyden
- Centre of Microbial and Plant Genetics (CMPG)
- Department of Microbial and Molecular Systems
- KU Leuven
- B-3001 Leuven, Belgium
| | - Erik V. Van der Eycken
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC)
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
| |
Collapse
|
18
|
Steenackers H, Hermans K, Vanderleyden J, De Keersmaecker SC. Salmonella biofilms: An overview on occurrence, structure, regulation and eradication. Food Res Int 2012. [DOI: 10.1016/j.foodres.2011.01.038] [Citation(s) in RCA: 314] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
19
|
Janssens JCA, Steenackers H, Metzger K, Daniels R, Ptacek D, Verhoeven T, Hermans K, Vanderleyden J, De Vos DE, De Keersmaecker SCJ. Interference with the quorum sensing systems of Salmonella enterica serovar typhimurium: possibilities and implications. Commun Agric Appl Biol Sci 2007; 72:35-39. [PMID: 18018856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- J C A Janssens
- Centre of Microbial and Plant Genetics, K.U. Leuven, Belgium
| | | | | | | | | | | | | | | | | | | |
Collapse
|