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https://www.readbyqxmd.com/read/28081368/smart-metal-organic-framework-coatings-triggered-anti-biofilm-compound-release
#1
Birgit Claes, Tom Boudewijns, Laurens Muchez, Geert Hooyberghs, Erik V Van der Eycken, Jozef Vanderleyden, Hans P Steenackers, Dirk E De Vos
Metal-organic frameworks (MOFs) have a large potential for delivery of active molecules. Here, a MOF coating is investigated as a smart host matrix for triggered release of anti-biofilm compounds. Besides a coating consisting of the regular Fe-terephthalate MIL-88B(Fe), a new hydrophobic MIL-88B(Fe) coating is synthesized in hydrothermal conditions using palmitic acid as a lattice terminating group. These porous materials are used as a host matrix for the anti-biofilm compound 5-(4-chlorophenyl)-N-(2-isobutyl)-2-aminoimidazole, which has a specific biofilm inhibiting effect at concentrations at which no activity against planktonic cells is detected...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28062292/use-of-carvacrol-thymol-and-eugenol-for-biofilm-eradication-and-resistance-modifying-susceptibility-of-salmonella-enterica-serovar-typhimurium-strains-to-nalidixic-acid
#2
Hanene Miladi, Tarek Zmantar, Bochra Kouidhi, Yassine Chaabouni, Kacem Mahdouani, Amina Bakhrouf, Kamel Chaieb
The Aims of the study was to evaluate the antibacterial susceptibility and the biofilm eradication of three natural compounds carvacrol (CAR), thymol (TH) and eugenol (EUG), alone or in combination with nalidixic acid (NA) against twelve Salmonella Typhimurium strains. The minimum inhibitory concentration (MIC) and the minimum biofilm eradication concentration (BEC50) of the tested compounds (CAR, TH and EUG) and their combinations with NA were evaluated. In order to assess whether these bacteria had active efflux pumps, ethidium bromide (EtBr) accumulation assays was achieved using spectrophotometric accumulation assays...
January 3, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28062286/qseb-mediates-biofilm-formation-and-invasion-in-salmonella-enterica-serovar-typhi
#3
Ying Ji, Wenliang Li, Ying Zhang, Long Chen, Yiquan Zhang, Xueming Zheng, Xinxiang Huang, Bin Ni
QseB is a response regulator of the QseBC two-component system (TCS) which is associated with quorum sensing and functions as a global regulator of flagella, biofilm formation, and virulence. The function of QseB and its interaction with QseC has been the subject of study in some organisms, however, little work was done in Salmonella enterica serovar Typhi (S. Typhi). The objective of this study was to investigate the effect of QseB on biofilm formation and virulence in S. Typhi. It showed that the biofilm formation ability of qseC mutant was limited as compared to the wild type strain...
January 3, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27995873/the-crispr-cas-system-presents-multiple-transcriptional-units-including-antisense-rnas-that-are-expressed-in-minimal-medium-and-up-regulated-by-ph-in-salmonella-enterica-serovar-typhi
#4
Liliana Medina-Aparicio, Javier Esteban Rebollar-Flores, América Abigail Beltrán-Luviano, Alejandra Vázquez Ramos, Rosa María Gutíerrez-Ríos, Leticia Olvera, Edmundo Calva, Ismael Hernández Lucas
The CRISPR-Cas system is involved in bacterial immunity, virulence, gene regulation, biofilm formation and sporulation. In Salmonella enterica serovar Typhi this system consists of five transcriptional units including antisense RNAs. It was determined that these genetic elements are expressed in minimal medium and are up-regulated by pH. In addition, a transcriptional characterization of cas3 and ascse2-1 is included herein.
December 20, 2016: Microbiology
https://www.readbyqxmd.com/read/27992644/a-genome-scale-modeling-approach-to-quantify-biofilm-component-growth-of-salmonella-typhimurium
#5
Nicholas Ribaudo, Xianhua Li, Brett Davis, Thomas K Wood, Zuyi Jacky Huang
Salmonella typhimurium (S. typhimurium) is an extremely dangerous foodborne bacterium that infects both animal and human subjects, causing fatal diseases around the world. Salmonella's robust virulence, antibiotic-resistant nature, and capacity to survive under harsh conditions are largely due to its ability to form resilient biofilms. Multiple genome-scale metabolic models have been developed to study the complex and diverse nature of this organism's metabolism; however, none of these models fully integrated the reactions and mechanisms required to study the influence of biofilm formation...
January 2017: Journal of Food Science
https://www.readbyqxmd.com/read/27910884/the-hha-tomb-toxin-antitoxin-system-shows-conditional-toxicity-and-promotes-persister-cell-formation-by-inhibiting-apoptosis-like-death-in-s-typhimurium
#6
Sangeeta Jaiswal, Prajita Paul, Chandrashekhar Padhi, Shilpa Ray, Daniel Ryan, Shantoshini Dash, Mrutyunjay Suar
Toxin-antitoxin (TA) modules are two component "addictive" genetic elements found on either plasmid or bacterial chromosome, sometimes on both. TA systems perform a wide range of functions like biofilm formation, persistence, programmed cell death, phage abortive infection etc. Salmonella has been reported to contain several such TA systems. However, the hemolysin expression modulating protein (Hha) and its adjacent uncharacterized hypothetical protein TomB (previously known as YbaJ), have not been listed as a TA module in Salmonella...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27878485/biofilms-in-bioremediation-and-wastewater-treatment-characterization-of-bacterial-community-structure-and-diversity-during-seasons-in-municipal-wastewater-treatment-process
#7
Yousra Turki, Ines Mehri, Rim Lajnef, Asma Ben Rejab, Amel Khessairi, Hanene Cherif, Hadda Ouzari, Abdennaceur Hassen
The bacterial community structure and diversity were assessed at the scale of rotating biodisk procedure (RB) in a semi-industrial pilot plant. As well, the Salmonella community was particularly monitored, and the effects of ultraviolet (UV-C254) on the bacterial community were studied. The identification of dominant bacteria revealed the presence of beneficial and useful species that could play an important role in the process of wastewater purification. Several species as Enterobacter agglomerans, Cronobacter sakazakii, and Pantoea agglomerans known for their bioremediation activities were revealed in the majority of biofilm samples...
November 22, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27878401/enterocin-b3a-b3b-produced-by-lab-collected-from-infant-faeces-potential-utilization-in-the-food-industry-for-listeria-monocytogenes-biofilm-management
#8
Alaa Al-Seraih, Yanath Belguesmia, John Baah, Sabine Szunerits, Rabah Boukherroub, Djamel Drider
Enterococcus faecalis B3A-B3B produces the bacteriocin B3A-B3B with activity against Listeria monocytogenes, Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA) and Clostridium perfringens, but apparently not against fungi or Gram-negative bacteria, except for Salmonella Newport. B3A-B3B enterocin has two different nucleotides but similar amino acid composition to the class IIb MR10A-MR10B enterocin. B3A-B3B consists of two peptides of predicted molecular mass of 5176.31 Da (B3A) and 5182...
November 22, 2016: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/27864173/salad-leaf-juices-enhance-salmonella-growth-colonization-of-fresh-produce-and-virulence
#9
Giannis Koukkidis, Richard Haigh, Natalie Allcock, Suzanne Jordan, Primrose Freestone
: We show in this report that traces of juices released from salad leaves as they become damaged can significantly enhance colonization of salad leaves by Salmonella enterica Salad juices in water increased Salmonella growth by 110% over the level seen with the unsupplemented control and in host-like serum-based media by more than 2,400-fold over control levels. In serum-based media, salad juices induced growth of Salmonella via provision of Fe from transferrin, and siderophore production was found to be integral to the growth induction process...
January 1, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27853317/high-mannose-specific-lectin-msl-mediates-key-interactions-of-the-vaginal-lactobacillus-plantarum-isolate-cmpg5300
#10
Shweta Malik, Mariya I Petrova, Nicole C E Imholz, Tine L A Verhoeven, Sam Noppen, Els J M Van Damme, Sandra Liekens, Jan Balzarini, Dominique Schols, Jos Vanderleyden, Sarah Lebeer
To characterize the interaction potential of the human vaginal isolate Lactobacillus plantarum CMPG5300, its genome was mined for genes encoding lectin-like proteins. cmpg5300.05_29 was identified as the gene encoding a putative mannose-binding lectin. Phenotypic analysis of a gene knock-out mutant of cmpg5300.05_29 showed that expression of this gene is important for auto-aggregation, adhesion to the vaginal epithelial cells, biofilm formation and binding to mannosylated glycans. Purification of the predicted lectin domain of Cmpg5300...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27836761/effect-of-holarrhena-antidysentrica-ha-and-andrographis-paniculata-ap-on-the-biofilm-formation-and-cell-membrane-integrity-of-opportunistic-pathogen-salmonella-typhimurium
#11
Ankit Tanwar, Raman Chawla, Ankita Singh Chakotiya, Pallavi Thakur, Rajeev Goel, Mitra Basu, Rajesh Arora, Haider Ali Khan
Increasing occurrence of gastroenteritis outbreaks caused by food borne opportunistic microorganisms has become a major problem in food industry as well as in immunocompromised host. Antimicrobial agents are losing their efficacy due to increase in the microbial resistance. For such reasons, conventional treatment has become limited to manage the infections state. Need of the hour is to instigate the search for safer holistic alternatives. The present study was hence conducted to assess the antibiofilm effect and mode of action of aquo alcoholic extracts of Holarrhena antidysentrica (Ha) and Andrographis paniculata (Ap) against the Salmonella enterica serovar typhimurium...
December 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27812526/evaluation-and-selection-of-bacillus-species-based-on-enzyme-production-antimicrobial-activity-and-biofilm-synthesis-as-direct-fed-microbial-candidates-for-poultry
#12
Juan D Latorre, Xochitl Hernandez-Velasco, Ross E Wolfenden, Jose L Vicente, Amanda D Wolfenden, Anita Menconi, Lisa R Bielke, Billy M Hargis, Guillermo Tellez
Social concern about misuse of antibiotics as growth promoters (AGP) and generation of multidrug-resistant bacteria have restricted the dietary inclusion of antibiotics in livestock feed in several countries. Direct-fed microbials (DFM) are one of the multiple alternatives commonly evaluated as substitutes of AGP. Sporeformer bacteria from the genus Bacillus have been extensively investigated because of their extraordinary properties to form highly resistant endospores, produce antimicrobial compounds, and synthesize different exogenous enzymes...
2016: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/27777572/role-of-yqic-in-the-pathogenicity-of-salmonella-and-innate-immune-responses-of-human-intestinal-epithelium
#13
Ke-Chuan Wang, Chih-Hung Huang, Shih-Min Ding, Ching-Kuo Chen, Hsu-Wei Fang, Ming-Te Huang, Shiuh-Bin Fang
The yqiC gene of Salmonella enterica serovar Typhimurium (S. Typhimurium) regulates bacterial growth at different temperatures and mice survival after infection. However, the role of yqiC in bacterial colonization and host immunity remains unknown. We infected human LS174T, Caco-2, HeLa, and THP-1 cells with S. Typhimurium wild-type SL1344, its yqiC mutant, and its complemented strain. Bacterial colonization and internalization in the four cell lines significantly reduced on yqiC depletion. Post-infection production of interleukin-8 and human β-defensin-3 in LS174T cells significantly reduced because of yqiC deleted in S...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27777468/effect-of-small-chain-n-acyl-homoserine-lactone-quorum-sensing-signals-on-biofilms-of-food-borne-pathogens
#14
Jamuna Bai A, Ravishankar Rai V
Quorum sensing or cell to cell communication which includes inter- and intra-cellular communication has been implicated in the production of virulence factor and formation of biofilm in food-borne pathogens. In the present study, the effect of quorum sensing signals on the biofilms of food-borne pathogens has been elucidated. N-butryl homoserine lactone and N-hexanoyl homoserine lactone belonging to acyl homoserine lactone (AHL) family of signaling molecules were investigated for their effect on the biofilm formation (attachment and exopolymeric substance production) in the food-borne pathogens Escherichia coli, Salmonella enterica serovar Typhimurium and Vibrio parahemolyticus...
September 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27774088/fermented-alore%C3%A3-a-table-olives-as-a-source-of-potential-probiotic-lactobacillus-pentosus-strains
#15
Beatriz Pérez Montoro, Nabil Benomar, Leyre Lavilla Lerma, Sonia Castillo Gutiérrez, Antonio Gálvez, Hikmate Abriouel
A collection of 31 Lactobacillus pentosus strains isolated from naturally fermented Aloreña green table olives were screened in depth in the present study for their probiotic potential. Several strains could be considered promising probiotic candidates since they showed good growth capacity and survival under simulated gastro-intestinal conditions (acidic pH of 1.5, up to 4% of bile salts and 5 mM of nitrate), good ability to auto-aggregate which may facilitate their adhesion to host cells as multiple aggregates and the subsequent displacement of pathogens...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27768382/phenotypic-and-molecular-characterization-of-salmonella-1-4-5-12-i-r-type-assut-isolates-from-humans-animals-and-environment-in-portugal-2006-2011
#16
Rui Seixas, Tânia Raquel Santos, Jorge Machado, Luís Tavares, Fernando Bernardo, Teresa Semedo-Lemsaddek, Manuela Oliveira
The increase in prevalence of Salmonella 1,4,[5],12:i:- related infections over the last few years has been considered a public health issue in many European countries, especially as this serovar may be associated with tetraresistance to ampicillin, streptomycin, sulfonamides, and tetracyclines (R-type ASSuT). Salmonella 1,4,[5],12:i:- isolates (n = 187) obtained by the Portuguese National Laboratory from different sources, including human clinical cases (n = 170), veterinary (n = 10), environmental (n = 6), and food samples (n = 1), were collected from 15 districts between 2006 and 2011...
October 21, 2016: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/27761636/bacterial-community-radial-spatial-distribution-in-biofilms-along-pipe-wall-in-chlorinated-drinking-water-distribution-system-of-east-china
#17
Jingqing Liu, Hongxing Ren, Xianbei Ye, Wei Wang, Yan Liu, Liping Lou, Dongqing Cheng, Xiaofang He, Xiaoyan Zhou, Shangde Qiu, Liusong Fu, Baolan Hu
Biofilms in the pipe wall may lead to water quality deterioration and biological instability in drinking water distribution systems (DWDSs). In this study, bacterial community radial-spatial distribution in biofilms along the pipe wall in a chlorinated DWDS of East China was investigated. Three pipes of large diameter (300, 600, and 600 mm) were sampled in this DWDS, including a ductile cast iron pipe (DCIP) with pipe age of 11 years and two gray cast iron pipes (GCIP) with pipe ages of 17 and 19 years, and biofilms in the upper, middle, and lower parts of each pipe wall were collected...
January 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27756305/bcsz-inhibits-biofilm-phenotypes-and-promotes-virulence-by-blocking-cellulose-production-in-salmonella-enterica-serovar-typhimurium
#18
Irfan Ahmad, Syed Fazle Rouf, Lei Sun, Annika Cimdins, Sulman Shafeeq, Soazig Le Guyon, Marco Schottkowski, Mikael Rhen, Ute Römling
BACKGROUND: Cellulose, a 1,4 beta-glucan polysaccharide, is produced by a variety of organisms including bacteria. Although the production of cellulose has a high biological, ecological and economical impact, regulatory mechanisms of cellulose biosynthesis are mostly unknown. Family eight cellulases are regularly associated with cellulose biosynthesis operons in bacteria; however, their function is poorly characterized. In this study, we analysed the role of the cellulase BcsZ encoded by the bcsABZC cellulose biosynthesis operon of Salmonella enterica serovar Typhimurium (S...
October 19, 2016: Microbial Cell Factories
https://www.readbyqxmd.com/read/27730246/zinc-is-required-to-ensure-the-expression-of-flagella-and-the-ability-to-form-biofilms-in-salmonella-enterica-sv-typhimurium
#19
Serena Ammendola, Ylenia D'Amico, Barbara Chirullo, Rosanna Drumo, Domenico Civardelli, Paolo Pasquali, Andrea Battistoni
Zinc is known to play a central role in bacterial physiology and pathogenesis. Here, we report that the accumulation of FliC, the structural subunit of Salmonella phase 1 flagella, is sharply reduced in a znuABC Salmonella enterica sv. Typhimurium strain grown in zinc-poor media. Consequently, this mutant strain lacks motility, unless it grows in zinc-replete environments. This phenotype is the consequence of a general downregulation of all the genes involved in the biosynthesis of flagella, suggesting that zinc is the cofactor of proteins involved in the initiation of the transcriptional regulatory cascade leading to flagella assembly...
October 1, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27714016/correction-zinc-is-required-to-ensure-the-expression-of-flagella-and-the-ability-to-form-biofilms-in-salmonella-enterica-sv-typhimurium
#20
Serena Ammendola, Ylenia D'Amico, Barbara Chirullo, Rosanna Drumo, Domenico Ciavardelli, Paolo Pasquali, Andrea Battistoni
Correction for 'Zinc is required to ensure the expression of flagella and the ability to form biofilms in Salmonella enterica sv Typhimurium' by Serena Ammendola et al., Metallomics, 2016, DOI: 10.1039/c6mt00108d.
October 5, 2016: Metallomics: Integrated Biometal Science
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