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https://www.readbyqxmd.com/read/28344574/health-associated-niche-inhabitants-as-oral-probiotics-the-case-of-streptococcus-dentisani
#1
Arantxa López-López, Anny Camelo-Castillo, María D Ferrer, Áurea Simon-Soro, Alex Mira
Oral diseases, including dental caries and periodontitis, are among the most prevalent diseases worldwide and develop as a consequence of a microbial dysbiosis. Several bacterial strains are being tested as potential oral health-promoting organisms, but usually they are species isolated from niches other than the site where they must exert its probiotic action, typically from fecal samples. We hypothesize that oral inhabitants associated to health conditions will be more effective than traditional, gut-associated probiotic species in key aspects such as colonization of the oral site where disease takes place or the possession of oral health promoting functions, as well as more practical issues like safety and toxicity, and establishing proper doses for administration...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28335414/inhibition-of-listeria-monocytogenes-on-ready-to-eat-meats-using-bacteriocin-mixtures-based-on-mode-of-action
#2
Paul Priyesh Vijayakumar, Peter M Muriana
Bacteriocin-producing (Bac⁺) lactic acid bacteria (LAB) comprising selected strains of Lactobacillus curvatus, Lactococcus lactis, Pediococcus acidilactici, and Enterococcus faecium and thailandicus were examined for inhibition of Listeria monocytogenes during hotdog challenge studies. The Bac⁺ strains, or their cell-free supernatants (CFS), were grouped according to mode-of-action (MOA) as determined from prior studies. Making a mixture of as many MOAs as possible is a practical way to obtain a potent natural antimicrobial mixture to address L...
March 14, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28328596/antibacterial-effect-of-bacteriocin-isolated-from-lactobacillus-plantarum-atcc-8014-on-postoperative-infection-of-mandibular-fracture-in-vivo
#3
Tao Fu, Yan-Ming Liu
OBJECTIVE: The primary objective of this study was to verify the effects of bacteriocin in treatment of postoperative infection of mandibular fracture in vivo. METHODS: Eighty-two mice were inoculated intravenously with staphylococcal suspensions. Bacterial cultures were obtained from implants. Blood samples were collected at 1, 2, 4, 6, and 8 hours after the injection of bacteriocins. RESULTS: Bacteriocins have significant inhibitory effects on Staphylococcus aureus (P < 0...
March 21, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28323618/contact-dependent-killing-by-caulobacter-crescentus-via-cell-surface-associated-glycine-zipper-proteins
#4
Leonor Garcia-Bayona, Monica S Guo, Michael T Laub
Most bacteria are in fierce competition with other species for limited nutrients. Some bacteria can kill nearby cells by secreting bacteriocins, a diverse group of proteinaceous antimicrobials. However, bacteriocins are typically freely diffusible, and so of little value to planktonic cells in aqueous environments. Here, we identify an atypical two-protein bacteriocin in the α-proteobacterium Caulobacter crescentus that is retained on the surface of producer cells where it mediates cell contact-dependent killing...
March 21, 2017: ELife
https://www.readbyqxmd.com/read/28323072/impairment-of-the-class-iia-bacteriocin-receptor-function-and-membrane-structural-changes-are-associated-to-enterocin-crl35-high-resistance-in-listeria-monocytogenes
#5
Emilse Masias, Fernando G Dupuy, Paulo Ricardo da Silva Sanches, Juan Vicente Farizano, Eduardo Cilli, Augusto Bellomio, Lucila Saavedra, Carlos Minahk
BACKGROUND: Enterocin CRL35 is a class IIa bacteriocin with anti-Listeria activity. Resistance to these peptides has been associated with either the downregulation of the receptor expression or changes in the membrane and cell walls. The scope of the present work was to characterize enterocin CRL35 resistant Listeria strains with MICs more than 10,000 times higher than the MIC of the WT sensitive strain. METHODS: Listeria monocytogenes INS7 resistant isolates R2 and R3 were characterized by 16S RNA gene sequencing and rep-PCR...
March 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28323017/whole-genome-sequencing-of-bacillus-velezensis-ls69-a-strain-with-a-broad-inhibitory-spectrum-against-pathogenic-bacteria
#6
Guoqiang Liu, Yingying Kong, Yajing Fan, Ce Geng, Donghai Peng, Ming Sun
Bacillus velezensis LS69 was found to exhibit antagonistic activity against a diverse spectrum of pathogenic bacteria. It has one circular chromosome of 3,917,761bp with 3,643 open reading frames. Genome analysis identified ten gene clusters involved in nonribosomal synthesis of polyketides (macrolactin, bacillaene and difficidin), lipopeptides (surfactin, fengycin, bacilysin and iturin A) and bacteriocins (amylolysin and amylocyclicin). In addition, B. velezensis LS69 was found to contain a series of genes involved in enhancing plant growth and triggering plant immunity...
March 17, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28314902/potential-factors-enabling-human-body-colonization-by-animal-streptococcus-dysgalactiae-subsp-equisimilis-strains
#7
Marcin Ciszewski, Eligia M Szewczyk
Streptococcus dysgalactiae subsp. equisimilis (SDSE) is a pyogenic, Lancefield C or G streptococcal pathogen. Until recently, it has been considered as an exclusive animal pathogen. Nowadays, it is responsible for both animal infections in wild animals, pets, and livestock and human infections often clinically similar to the ones caused by group A streptococcus (Streptococcus pyogenes). The risk of zoonotic infection is the most significant in people having regular contact with animals, such as veterinarians, cattlemen, and farmers...
March 18, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28299945/in-vitro-and-in-vivo-cholesterol-lowering-ability-of-lactobacillus-pentosus-kf923750
#8
F Bendali, K Kerdouche, S Hamma-Faradji, D Drider
Lactobacillus pentosus KF923750 was characterised for probiotic related properties and then characterised for cholesterol uptake in vitro as well as in vivo using rabbits fed a high-cholesterol diet. The survival percentage of L. pentosus KF923750 was 100% at pH 3, 52.18% at pH 2 and 36.21% at pH 2 plus pepsin. Similarly, this strain appeared resistant to bile (0.1% [98.42%], 0.3% [88.52%], 0.5% [75.60%] and 1% [71.15%]), after 4 h exposure. Moreover, L. pentosus KF923750 controlled growth of Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 through the production of a bacteriocin-like inhibitory substance and anti-adhesive capabilities...
March 16, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/28299684/bacterial-detection-using-peptide-based-platform-and-impedance-spectroscopy
#9
Hashem Etayash, Thomas Thundat, Kamaljit Kaur
Antimicrobial peptides have the ability to function as bio-recognition elements in the detection of bacteria. For instance, we showed that Leucocin A, an antimicrobial peptide from class IIa bacteriocins, binds gram-positive Listeria monocytogenes with higher affinity than other gram-positive bacteria like S. aureus, L. innocua, and E. faecalis. The binding was detected using impedance spectroscopy when Leucocin A immobilized on impedance electrodes binds bacteria from a sample. Here we highlight the strength of utilizing Leucocin A as a bio-recognition probe in biosensor platforms and provide details on its application in real-time bacterial detection using electrochemical impedance spectroscopy...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28299290/anti-listeria-activity-of-lactic-acid-bacteria-in-two-traditional-sicilian-cheeses
#10
Maria Luisa Scatassa, Raimondo Gaglio, Cinzia Cardamone, Giusi Macaluso, Luigi Arcuri, Massimo Todaro, Isabella Mancuso
Listeria monocytogenes is a pathogen frequently found in dairy products, and its growth is difficult to control. Bacteriocin-like inhibitory substances (BLIS), produced by lactic acid bacteria (LAB), having proven in vitro anti-Listeria activity, could provide an innovative approach to control L. monocytogenes; however, this application needs to be evaluated in vivo. In this study, twenty LAB strains isolated from different Sicilian dairy environments were tested for control of growth of L. monocytogenes in three different experimental trials...
January 24, 2017: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28294058/recognizing-and-predicting-thioether-bridges-formed-by-lanthionine-and-%C3%AE-methyllanthionine-in-lantibiotics-using-a-random-forest-approach-with-feature-selection
#11
ShaoPeng Wang, Yu-Hang Zhang, Ning Zhang, Lei Chen, Tao Huang, Yu-Dong Cai
Lantibiotics, which are usually produced from Gram-positive bacteria, are regarded as one type of special bacteriocins. Lantibiotics have unsaturated amino acid residues formed by lanthionine (Lan) and β-methyllanthionine (MeLan) residues as a ring structure in the peptide. They are derived from the serine and threonine residues and are essential to preventing the growth of other similar strains. In this pioneering work, we firstly proposed a machine learning method to recognize and predict the Lan and MeLan residues in the protein sequences of lantibiotics...
March 10, 2017: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/28293865/the-inhibition-effect-of-lactobacilli-against-growth-and-biofilm-formation-of-pseudomonas-aeruginosa
#12
Dariush Shokri, Mohammad Rabbani Khorasgani, Milad Mohkam, Seyed Masih Fatemi, Younes Ghasemi, Asghar Taheri-Kafrani
The emergence of antibiotic-resistant and food-spoilage microorganisms has renewed efforts to identify safe and natural alternative agents of antibiotics such as probiotics. The aim of this study was the isolation of lactobacilli as potential probiotics from local dairy products with broad antibacterial and anti-biofilm activities against antibiotic-resistant strains of Pseudomonas aeruginosa and determination of their inhibition mechanism. Antibiotic susceptibility and classification of acquired resistance profiles of 80 P...
March 14, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28285660/genetic-and-biochemical-characterization-of-hyicin-3682-the-first-bacteriocin-reported-for-staphylococcus-hyicus
#13
Patrícia Carlin Fagundes, Ilana Nascimento de Sousa Santos, Márcia Silva Francisco, Rodolpho Mattos Albano, Maria do Carmo de Freire Bastos
Hyicin 3682, the first bacteriocin reported for Staphylococcus hyicus, is a BsaCOL variant produced by S. hyicus 3682, a strain isolated from bovine milk. Hyicin 3682 is found in the culture supernatant, is bactericidal and its producing strain exhibits a much broader spectrum of antimicrobial activity than the producing strain of BsaCOL against several Gram-positive bacteria, which include foodborne pathogens, food-spoilage microorganisms and bacterial species of medical and veterinary importance. Sequencing of the genome of S...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28284993/pediococcus-spp-an-important-genus-of-lactic-acid-bacteria-and-pediocin-producers
#14
REVIEW
Maria Carolina W Porto, Taís Mayumi Kuniyoshi, P O S Azevedo, Michele Vitolo, R P S Oliveira
Probiotics have gained increasing attention due to several health benefits related to the human digestive and immune systems. Pediococcus spp. are lactic acid bacteria (LAB) that are widely described as probiotics and characterized as coccus-shaped bacteria (arranged in tetrads), Gram-positive, non-motile, non-spore forming, catalase-negative, and facultative anaerobes. There are many Pediococcus strains that produce pediocin, an effective antilisterial bacteriocin. Pediocins are small, cationic molecules consisting of a conserved hydrophilic N-terminal portion containing the YGNGV motif and an amphiphilic or hydrophobic C-terminal variable portion...
March 8, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28280842/in-vitro-effect-of-vaginal-lactobacilli-on-the-growth-and-adhesion-abilities-of-uropathogenic-escherichia-coli
#15
María Cecilia Leccese Terraf, María Silvina Juarez Tomás, Lucie Rault, Yves Le Loir, Sergine Even, María Elena Fátima Nader-Macías
Escherichia coli is one of the main causes of uncomplicated urinary tract infections and responsible of vaginal infections. Lactobacilli can inhibit this pathogen by the production of antimicrobial substances as organic acids, hydrogen peroxide and/or bacteriocins. The aim of this work was to study the effects of beneficial vaginal lactobacilli on E. coli through in vitro experiments. The inhibitory activity of three vaginal Lactobacillus strains against E. coli was assessed using the agar plate diffusion. Moreover, the effect of Lactobacillus reuteri CRL (Centro de Referencia para Lactobacilos Culture Collection) 1324 on the adhesion and internalization capabilities of E...
March 9, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28280011/draft-genome-sequence-of-agrococcusbaldri-strain-marseille-p2731
#16
Pamela Afouda, Gregory Dubourg, Noemie Labas, Didier Raoult, Pierre-Edouard Fournier
Agrococcus baldri strain Marseille-P2731 was isolated from a Siberian permafrost specimen dated around 10 million years. The 3,021,022-bp genome of strain Marseille-P2731, with a 71.82% G+C content, includes 2,844 protein-coding genes, 72 toxin/antitoxin modules, nine bacteriocin-encoding genes, and 1,266 genes associated with mobilome.
March 9, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28271469/lactobacillus-plantarum-and-its-probiotic-and-food-potentialities
#17
Hamza Ait Seddik, Farida Bendali, Frédérique Gancel, Ismail Fliss, Giuseppe Spano, Djamel Drider
The number of studies claiming probiotic health effects of Lactobacillus plantarum is escalating. Lb. plantarum is a lactic acid bacterium found in diverse ecological niches, highlighting its particular capabilities of adaptation and genome plasticity. Another function that needs to be underlined is the capabilities of Lb. plantarum to produce diverse and potent bacteriocins, which are antimicrobial peptides with possible applications as food preservative or antibiotic complementary agents. Taken together, all these characteristics design Lb...
March 7, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28270262/lantibiotics-produced-by-actinobacteria-and-their-potential-applications-a-review
#18
Karen Machado Gomes, Rafael Silva Duarte, Maria do Carmo de Freire Bastos
The phylum Actinobacteria, which comprises a great variety of Gram-positive bacteria with a high G+C content in their genomes, is known for its large production of bioactive compounds, including those with antimicrobial activity. Among the antimicrobials, bacteriocins, ribosomally synthesized peptides, represent an important arsenal of potential new drugs to face the increasing prevalence of resistance to antibiotics among microbial pathogens. The actinobacterial bacteriocins form a heterogeneous group of substances that is difficult to adapt to most proposed classification schemes...
February 2017: Microbiology
https://www.readbyqxmd.com/read/28270261/exploring-the-parameters-of-post-segregational-killing-using-heterologous-expression-of-secreted-toxin-barnase-and-antitoxin-barstar-in-an-escherichia-coli-case-study
#19
Dorien S Coray, Brigitta Kurenbach, Jack A Heinemann
Post-segregational killing (PSK) is a phenotype determined by plasmids using a toxin and an antitoxin gene pair. Loss of the genes depletes the cell's reserve of antitoxin and allows the toxin to act upon the cell. PSK benefits mobile elements when it increases reproductive success relative to other mobile competitors. A side effect of PSK is that plasmids become refractory to displacement from the cell during growth as a monoculture. Most PSK systems use a cytoplasmic toxin, but the external toxins of bacteriocins also have a PSK-like effect...
February 2017: Microbiology
https://www.readbyqxmd.com/read/28268063/human-escherichia-coli-isolates-from-hemocultures-septicemia-linked-to-urogenital-tract-infections-is-caused-by-isolates-harboring-more-virulence-genes-than-bacteraemia-linked-to-other-conditions
#20
Lenka Micenková, Alžbeta Beňová, Lucia Frankovičová, Juraj Bosák, Martin Vrba, Alena Ševčíková, Marta Kmeťová, David Šmajs
Escherichia coli is the most common cause of bloodstream infections and community-acquired sepsis. The main aim of this study was to determine virulence characteristics of E. coli isolates from hemocultures of patients with a primary disease of urogenital tract, digestive system, a neoplastic blood disease, or other conditions. Results from a set of 314 E. coli isolates from hemocultures were compared to data from a previously published analysis of 1283 fecal commensal E. coli isolates. Genetic profiling of the 314 E...
February 27, 2017: International Journal of Medical Microbiology: IJMM
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