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https://www.readbyqxmd.com/read/28642749/rna-seq-reveals-enhanced-sugar-metabolism-in-streptococcus-mutans-co-cultured-with-candida-albicans-within-mixed-species-biofilms
#1
Jinzhi He, Dongyeop Kim, Xuedong Zhou, Sang-Joon Ahn, Robert A Burne, Vincent P Richards, Hyun Koo
Early childhood caries (ECC), which can lead to rampant tooth-decay that is painful and costly to treat, is one of the most prevalent infectious diseases affecting children worldwide. Previous studies support that interactions between Streptococcus mutans and Candida albicans are associated with the pathogenesis of ECC. The presence of Candida enhances S. mutans growth, fitness and accumulation within biofilms in vitro, although the molecular basis for these behaviors is undefined. Using an established co-cultivation biofilm model and RNA-Seq, we investigated how C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28635414/core-shell-pla-pva-porous-microparticles-as-carriers-for-bacteriocin-nisin
#2
Pavlina Holcapkova, Martina Hrabalikova, Petra Stoplova, Vladimir Sedlarik
This work is focused on preparation of novel porous type of core-shell-structured microparticles based on polylactide (shell) and poly(vinyl alcohol) cross-linked with glutaric acid (GA) (core) prepared by water-in-oil-in-water solvent evaporation technique. The microparticle systems were used as delivery systems for immobilisation of model antibacterial agent - nisin. The effect of cross-linking and the initial amount of nisin on their morphology was investigated using scanning electron microscopy, BET analysis, zeta potential measurement and Fourier transform infra-red spectroscopy...
June 21, 2017: Journal of Microencapsulation
https://www.readbyqxmd.com/read/28615683/bacteriocin-gene-trait-matching-across-the-complete-lactobacillus-pan-genome
#3
Fergus W J Collins, Paula M O'Connor, Orla O'Sullivan, Beatriz Gómez-Sala, Mary C Rea, Colin Hill, R Paul Ross
Lactobacilli constitute a large genus of Gram-positive lactic acid bacteria which have widespread roles ranging from gut commensals to starters in fermented foods. A combination of in silico and laboratory-based screening allowed us to determine the overall bacteriocin producing potential of representative strains of each species of the genus. The genomes of 175 lactobacilli and 38 associated species were screened for the presence of antimicrobial producing genes and combined with screening for antimicrobial activity against a range of indicators...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28612025/effects-of-streptococcus-sanguinis-bacteriocin-on-deformation-adhesion-ability-and-young-s-modulus-of-candida-albicans
#4
Shengli Ma, Wenyu Ge, Yifan Yan, Xu Huang, Li Ma, Chunmei Li, Shuyang Yu, Chunxiao Chen
In order to study the thallus changes on microscopic morphology and mechanical properties of Candida albicans antagonized by Streptococcus sanguinis bacteriocin, the adhesion ability and Young's modulus of thalli and hypha of Candida albicans were measured by the relative measurement method using atomic force microscope's (AFM) tapping model. The results showed that the average adhesion ability and Young's modulus of thalli were 7.35 ± 0.77 nN and 7.33 ± 1.29 Mpa, respectively; the average adhesion ability and Young's modulus of hypha were 9...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28609113/novel-approaches-to-purifying-bacteriocin-a-review
#5
Norfariza Jamaluddin, David C Stuckey, Arbakariya B Ariff, Fadzlie Wong Faizal Wong
Bacteriocin is a proteinaceous biomolecule produced by bacteria (both Gram-positive and Gram-negative) that exhibits antimicrobial activity against closely related species, and food-borne pathogens. It has recently gained importance and attracted the attention of several researchers looking to produce it from various substrates and bacterial strains. This ushers in a new era of food preservation where the use of bacteriocin in food products will be an alternative to chemical preservatives, and heat treatment which are understood to cause unwanted side effects, and reduce sensory and nutritional quality...
June 13, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28605978/isolation-and-preliminary-characterization-of-a-bacteriocin-producer-bacillus-strain-inhibiting-methicillin-resistant-staphylococcus-aureus
#6
Ankit Kumar Chauhan, Dinesh Kumar Maheshwari, Vivek K Bajpai
In a multivalent approach to discover new antimicrobial substance, a total of 160 Bacilli were isolated from termitarium soil, characterized on the basis of their morphological and physiological characters and screened for their antimicrobial activity by agar well diffusion method against certain drug resistant pathogenic bacteria such as Staphylococcus aureus, Methicillin resistant Staphylococcus aureus and common food contaminating bacteria Listeria monocytogenes. After preliminary screening, sixteen isolates showed inhibitory activity against test pathogens...
June 2017: Acta Biologica Hungarica
https://www.readbyqxmd.com/read/28605543/dual-action-of-bacteriocin-plnc8-%C3%AE-%C3%AE-through-inhibition-of-porphyromonas-gingivalis-infection-and-promotion-of-cell-proliferation
#7
Torbjörn Bengtsson, Boxi Zhang, Robert Selegård, Emanuel Wiman, Daniel Aili, Hazem Khalaf
Periodontitis is a chronic inflammatory disease that is characterized by accumulation of pathogenic bacteria, including Porphyromonas gingivalis, in periodontal pockets. The lack of effective treatments has emphasized in an intense search for alternative methods to prevent bacterial colonization and disease progression. Bacteriocins are bacterially produced antimicrobial peptides gaining increased consideration as alternatives to traditional antibiotics. We show rapid permeabilization and aggregation of P. gingivalis by the two-peptide bacteriocin PLNC8 αβ...
June 12, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28601447/phenotypic-and-genotypic-antimicrobial-susceptibility-pattern-of-streptococcus-spp-isolated-from-cases-of-clinical-mastitis-in-dairy-cattle-in-poland
#8
E Kaczorek, J Małaczewska, R Wójcik, W Rękawek, A K Siwicki
Mastitis of dairy cattle is one of the most frequently diagnosed diseases worldwide. The main etiological agents of mastitis are bacteria of the genus Streptococcus spp., in which several antibiotic resistance mechanisms have been identified. However, detailed studies addressing this problem have not been conducted in north-eastern Poland. Therefore, the aim of our study was to analyze, on phenotypic and genotypic levels, the antibiotic resistance pattern of Streptococcus spp. isolated from clinical cases of mastitis from dairy cattle in this region of Poland...
June 7, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28597170/mathematical-model-of-interaction-between-bacteriocin-producing-lactic-acid-bacteria-and-listeria-part-1-steady-states-and-thresholds
#9
Roberta Regina Delboni, Hyun Mo Yang
Mathematical modeling is an important tool to assessing quantitative conjectures and to answer specific questions. In the modeling, we assume that a competitor represented by a lactic acid bacterium produces antimicrobial compounds (substances that kill microorganisms or inhibit their growth), such as lactic acid and bacteriocins, with some cost to its own growth. Bacteriocins are protein compounds with antimicrobial effect against related species and bacteria such as Listeria monocytogenes, which is foodborne pathogen that cause listeriosis...
June 8, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28596555/controlled-functional-expression-of-the-bacteriocins-pediocin-pa-1-and-bactofencin-a-in-escherichia-coli
#10
Beatriz Mesa-Pereira, Paula M O'Connor, Mary C Rea, Paul D Cotter, Colin Hill, R Paul Ross
The bacteriocins bactofencin A (class IId) and pediocin PA-1 (class IIa) are encoded by operons with a similarly clustered gene organization including a structural peptide, an immunity protein, an ABC transporter and accessory bacteriocin transporter protein. Cloning of these operons in E. coli Tuner(TM) (DE3) on a pETcoco-2 derived vector resulted in successful secretion of both bacteriocins. A corresponding approach, involving the construction of vectors containing different combinations of these genes, revealed that the structural and the transporter genes alone are sufficient to permit heterologous production and secretion in this host...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28579977/in-silico-prediction-in-vitro-antibacterial-spectrum-and-physicochemical-properties-of-a-putative-bacteriocin-produced-by-lactobacillus-rhamnosus-strain-l156-4
#11
Letícia de C Oliveira, Aline M M Silveira, Andréa de S Monteiro, Vera L Dos Santos, Jacques R Nicoli, Vasco A de C Azevedo, Siomar de C Soares, Marcus V Dias-Souza, Regina M D Nardi
A bacteriocinogenic Lactobacillus rhamnosus L156.4 strain isolated from the feces of NIH mice was identified by 16S rRNA gene sequencing and MALDI-TOF mass spectrometry. The entire genome was sequenced using Illumina, annotated in the PGAAP, and RAST servers, and deposited. Conserved genes associated with bacteriocin synthesis were predicted using BAGEL3, leading to the identification of an open reading frame (ORF) that shows homology with the L. rhamnosus GG (ATCC 53103) prebacteriocin gene. The encoded protein contains a conserved protein motif associated a structural gene of the Enterocin A superfamily...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28578132/effect-of-electro-activated-aqueous-solutions-nisin-and-moderate-heat-treatment-on-the-inactivation-of-clostridium-sporogenes-pa-3679-spores-in-green-beans-puree-and-whole-green-beans
#12
Omar El Jaam, Ismail Fliss, Mohammed Aïder
In this work, the synergistic effect of electro-activated solutions (EAS) of potassium acetate and potassium citrate, nisin and moderate heat treatment to inactivate C. sporogenes PA 3679 spores was evaluated in green beans puree and whole green beans. Electro-activated solutions (EAS) of potassium acetate and potassium citrate were generated under 400 mA during 60 min. They were characterized by an oxidation-reduction potential (ORP) and pH values ranged from +300 to +1090 mV and 2.8 to 3.67, respectively...
May 31, 2017: Anaerobe
https://www.readbyqxmd.com/read/28572793/bacteriocin-producing-enterococcus-faecium-lcw-44-a-high-potential-probiotic-candidate-from-raw-camel-milk
#13
Allison Vimont, Benoît Fernandez, Riadh Hammami, Ahlem Ababsa, Hocine Daba, Ismaïl Fliss
Bacterial isolates from raw camel milk were screened for antibacterial activity using the agar diffusion assay. Ten isolates selected for their inhibition of Gram-positive bacteria were identified by 16S sequencing as Enterococcus faecium or durans. An isolate named E. faecium LCW 44 exhibited the broadest antibacterial spectrum with an inhibitory activity against several Gram-positive strains belonging to the genera Clostridium, Listeria, Staphylococcus, and Lactobacillus. E. faecium LCW 44 was shown to produce N-formylated enterocins L50A and L50B, as revealed by mass spectrometry and PCR analyses...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28570918/purification-of-leucocin-a-for-use-on-wieners-to-inhibit-listeria-monocytogenes-in-the-presence-of-spoilage-organisms
#14
Danielle R Balay, Ramana V Dangeti, Kamaljit Kaur, Lynn M McMullen
The aims of this study were to improve the method for purification of leucocin A to increase yield of peptide and to evaluate the efficacy of leucocin A and an analogue of leucocin A (leucocin N17L) to inhibit the growth of Listeria monocytogenes on wieners in the presence of spoilage organisms. Leucocin A was produced by Leuconostoc gelidum UAL187 and purified with a five-fold increase in yield; leucocin N17L was synthesized replacing asparagine at residue 17 with leucine. Five strains of L. monocytogenes associated with foodborne illness were used to assess bacteriocin efficacy in vitro and in situ...
May 24, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28560515/stimulating-effects-of-sucrose-and-inulin-on-growth-lactate-and-bacteriocin-productions-by-pediococcus-pentosaceus
#15
Pamela Oliveira de Souza de Azevedo, Attilio Converti, José Manuel Domínguez, Ricardo Pinheiro de Souza Oliveira
Sucrose and inulin, when combined with glucose, behaved as stimulating agents of bacteriocin production by Pediococcus pentosaceus ATCC 43200. When such microbial strain was grown in glucose-based Man, Rogosa, and Sharpe (MRS) medium, without any additional supplement, it showed higher maximum cell concentration (2.68 ± 1.10 g/L) and longer generation time (2.17 ± 0.02 h), but lower specific growth rate (0.32 ± 0.01 h(-1)) than in the same medium supplemented with 1.0% of both ingredients (2.53 ± 1...
May 30, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28552660/technology-and-safety-assessment-for-lactic-acid-bacteria-isolated-from-traditional-bulgarian-fermented-meat-product-lukanka
#16
Svetoslav Dimitrov Todorov, Saso Stojanovski, Ilia Iliev, Penka Moncheva, Luis Augusto Nero, Iskra Vitanova Ivanova
The present work discusses the technological and new selection criteria that should be included for selecting lactic acid bacteria for production of fermented meat. Lactic acid bacteria isolated from Bulgarian traditional fermented "lulanka" salami was studied regarding some positive technological parameters (growth at different temperature, pH, and proteolytic activity). The presence of genes related to the virulence factors, production of biogenic amines, and vancomycin resistance were presented in low frequency in the studied lactic acid bacteria...
May 11, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28535747/in-vitro-assessment-of-pediococcus-acidilactici-kp10-for-its-potential-use-in-the-food-industry
#17
Sahar Abbasiliasi, Joo Shun Tan, Fatemeh Bashokouh, Tengku Azmi Tengku Ibrahim, Shuhaimi Mustafa, Faezeh Vakhshiteh, Subhashini Sivasamboo, Arbakariya B Ariff
BACKGROUND: Selection of a microbial strain for the incorporation into food products requires in vitro and in vivo evaluations. A bacteriocin-producing lactic acid bacterium (LAB), Pediococcus acidilactici Kp10, isolated from a traditional dried curd was assessed in vitro for its beneficial properties as a potential probiotic and starter culture. The inhibitory spectra of the bacterial strain against different gram-positive and gram-negative bacteria, its cell surface hydrophobicity and resistance to phenol, its haemolytic, amylolytic and proteolytic activities, ability to produce acid and coagulate milk together with its enzymatic characteristics and adhesion property were all evaluated in vitro...
May 23, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28534113/cysteine-rich-low-molecular-weight-antimicrobial-peptides-from-brevibacillus-and-related-genera-for-biotechnological-applications
#18
REVIEW
Piyush Baindara, Anoop Kapoor, Suresh Korpole, Vishakha Grover
The production of natural antimicrobial peptides (AMPs) is an innate immunity trait of all life forms including eukaryotes and prokaryotes. While these AMPs are usually called as defensins in eukaryotes, they are known as bacteriocins in prokaryotes. Bacteriocins are more diverse AMPs considering their varied composition and posttranslational modifications. Accordingly, this review is focused on cysteine-rich AMPs resembling eukaryotic defensins such as laterosporulin from Brevibacillus spp. and associated peptides secreted by the members of related genera...
June 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28533181/comparative-genome-analysis-of-lactobacillus-plantarum-gb-lp3-provides-candidates-of-survival-related-genetic-factors
#19
Soomin Jeon, Jaehoon Jung, Kwondo Kim, DongAhn Yoo, Chanho Lee, Jungsun Kang, Kyungjin Cho, Dae-Kyung Kang, Woori Kwak, Sook Hee Yoon, Heebal Kim, Seoae Cho
Lactobacillus plantarum is found in various environmental niches such as in the gastrointestinal tract of an animal host or a fermented food. This species isolated from a certain environment is known to possess a variety of properties according to inhabited environment's adaptation. However, a causal relationship of a genetic factor and phenotype affected by a specific environment has not been systematically comprehended. L. plantarum GB-LP3 strain was isolated from Korean traditional fermented vegetable and the whole genome of GB-LP3 was sequenced...
May 19, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28526791/pseudomonas-chlororaphis-produces-two-distinct-r-tailocins-that-contribute-to-bacterial-competition-in-biofilms-and-on-roots
#20
Robert J Dorosky, Jun Myoung Yu, Leland S Pierson, Elizabeth A Pierson
R-type tailocins are high molecular weight bacteriocins that resemble bacteriophage tails and are encoded within the genomes of many Pseudomonas species. In this study, analysis of the P. chlororaphis 30-84 R-tailocin gene cluster revealed that it encodes the structural components to produce two R-tailocins of different ancestral origin. Two distinct R-tailocin populations differing in length were observed in UV induced lysates of P. chlororaphis 30-84 via transmission electron microscopy. Mutants defective in the production of one or both R-tailocins demonstrated that the killing spectrum of each tailocin is limited to Pseudomonas species...
May 19, 2017: Applied and Environmental Microbiology
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