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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
#1
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
#2
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
#3
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-fresh-produce-colonisation-and-virulence
#4
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 became damaged can significantly enhance Salmonella enterica salad leaf colonisation. Salad juices in water increased Salmonella growth by 110% over the un-supplemented control, and in host-like serum based media by more than 2400-fold over controls. 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...
November 18, 2016: 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
#5
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
#6
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...
November 9, 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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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...
October 19, 2016: 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
#13
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
#14
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
#15
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
https://www.readbyqxmd.com/read/27711156/in-vitro-antibacterial-activity-of-rhodanine-derivatives-against-pathogenic-clinical-isolates
#16
Ahmed AbdelKhalek, Charles R Ashby, Bhargav A Patel, Tanaji T Talele, Mohamed N Seleem
Bacterial infections present a serious challenge to healthcare practitioners due to the emergence of resistance to numerous conventional antibacterial drugs. Therefore, new bacterial targets and new antimicrobials are unmet medical needs. Rhodanine derivatives have been shown to possess potent antimicrobial activity via a novel mechanism. However, their potential use as antibacterials has not been fully examined. In this study, we determined the spectrum of activity of seven rhodanine derivatives (compounds Rh 1-7) against clinical isolates of Gram-positive and Gram-negative bacterial strains and Candida albicans...
2016: PloS One
https://www.readbyqxmd.com/read/27697162/influence-of-pdo-ragusano-cheese-biofilm-microbiota-on-flavour-compounds-formation
#17
Stefania Carpino, Cinzia L Randazzo, Alessandra Pino, Nunziatina Russo, Teresa Rapisarda, Gianni Belvedere, Cinzia Caggia
The objectives of the present study were to characterize the biofilm microbiota of 11 different farms (from A to K), producing PDO Ragusano cheese, and to investigate on its ability to generate volatile organic compounds (VOCs) in milk samples inoculated with biofilm and incubated under Ragusano cheese making conditions. The biofilms were subjected to plate counting and PCR/T/DGGE analysis and the VOCs generated in incubated milk samples were evaluated through SmartNose, GC/O, and GC/MS. Streptococcus thermophilus was the dominant species both in biofilms and in incubated milks...
February 2017: Food Microbiology
https://www.readbyqxmd.com/read/27695450/genetic-and-phenotypic-characterization-of-a-salmonella-enterica-serovar-enteritidis-emerging-strain-with-superior-intra-macrophage-replication-phenotype
#18
Inna Shomer, Alon Avisar, Prerak Desai, Shalhevet Azriel, Gill Smollan, Natasha Belausov, Nathan Keller, Daniel Glikman, Yasmin Maor, Avi Peretz, Michael McClelland, Galia Rahav, Ohad Gal-Mor
Salmonella enterica serovar Enteritidis (S. Enteritidis) is one of the ubiquitous Salmonella serovars worldwide and a major cause of food-born outbreaks, which are often associated with poultry and poultry derivatives. Here we report a nation-wide S. Enteritidis clonal outbreak that occurred in Israel during the last third of 2015. Pulsed field gel electrophoresis and whole genome sequencing identified genetically related strains that were circulating in Israel as early as 2008. Global comparison linked this outbreak strain to several clinical and marine environmental isolates that were previously isolated in California and Canada, indicating that similar strains are prevalent outside of Israel...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27648759/chemical-physical-and-morphological-properties-of-bacterial-biofilms-affect-survival-of-encased-campylobacter-jejuni-f38011-under-aerobic-stress
#19
Jinsong Feng, Guillaume Lamour, Rui Xue, Mehr Negar Mirvakliki, Savvas G Hatzikiriakos, Jie Xu, Hongbin Li, Shuo Wang, Xiaonan Lu
Campylobacter jejuni is a microaerophilic pathogen and leading cause of human gastroenteritis. The presence of C. jejuni encased in biofilms found in meat and poultry processing facilities may be the major strategy for its survival and dissemination in aerobic environment. In this study, Staphylococcus aureus, Salmonella enterica, or Pseudomonas aeruginosa was mixed with C. jejuni F38011 as a culture to form dual-species biofilms. After 4days' exposure to aerobic stress, no viable C. jejuni cells could be detected from mono-species C...
December 5, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/27609462/response-of-salmonella-typhi-to-bile-generated-oxidative-stress-implication-of-quorum-sensing-and-persister-cell-populations
#20
Yogesh D Walawalkar, Yatindra Vaidya, Vijayashree Nayak
Salmonella Typhi can chronically persist within the gallbladder of patients suffering from gallbladder diseases. This study, intended to improve our understanding of bacterial mechanisms underlying bile adaptation, revealed that bile, which is a bactericidal agent, led to the generation of reactive oxygen species in S Typhi. Salmonella Typhi in response showed a significant increase in the production of anti-oxidative enzymes, namely superoxide dismutase and catalase. The work reports that the quorum-sensing (QS) system of S Typhi regulates the level of these enzymes during oxidative stress...
November 2016: Pathogens and Disease
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