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Research in Microbiology

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https://www.readbyqxmd.com/read/28093322/anti-pathogenic-and-probiotic-attributes-of-lactobacillus-salivarius-and-lactobacillus-plantarum-strains-isolated-from-feces-of-algerian-infants-and-adults
#1
Hamza Ait Seddik, Farida Bendali, Benoit Cudennec, Djamel Drider
Sixty-seven (67) lactic acid bacteria (LAB) isolates belonging to Lactobacillus genus were isolated from human feces and tested for their auto-aggregation and cell surface hydrophobicity in order to establish their adhesion capabilities, a prerequisite for probiotic selection. Strains with the upmost auto-aggregation and cell surface hydrophobicity scores were identified by MALDI-TOF spectrometry and 16S rDNA sequencing as Lactobacillus plantarum (p25lb1 and p98lb1) and Lactobacillus salivarius (p85lb1 and p104lb1)...
January 13, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28093321/sulfur-compound-oxidation-and-carbon-co-assimilation-in-the-haloalkaliphilic-sulfur-oxidizers-thioalkalivibrio-versutus-and-thioalkalimicrobium-aerophilum
#2
Wee Kiong Ang, Mahbob Maisarah, Rabeb Dhouib, Ulrike Kappler
Alkaliphilic sulfur-oxidizing bacteria are highly abundant in naturally occurring soda lakes,where they are found both in surface waters and sediments. Here we studied oxidation of sulfide and thiosulfate in batch cultures of Thioalkalimicrobium aerophilum and Thioalkalivibrio versutus, two species that represent different metabolic types, as indicated by the absence or presence of sulfur production during growth, respectively. With thiosulfate, both species showed the expected sulfur oxidation patterns; however, during growth on sulfide, both T...
January 13, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28040468/characterizations-of-purple-non-sulfur-bacteria-isolated-from-paddy-fields-and-identification-of-strains-with-potential-for-plant-growth-promotion-greenhouse-gas-mitigation-and-heavy-metal-bioremediation
#3
Jakkapan Sakpirom, Duangporn Kantachote, Tomorn Nunkaew, Eakalak Khan
This study was aimed at selecting purple non-sulfur bacteria (PNSB) isolated from various paddy fields, including Cd- and Zn-contaminated paddy fields, based on their biofertilizer properties. Among 235 PNSB isolates, strain TN110 was most effective in plant growth-promoting substance (PGPS) production, releasing 3.2 mg/L of [Formula: see text] , 4.11 mg/L of 5-aminolevulinic acid (ALA) and 3.62 mg/L of indole-3-acetic acid (IAA), and reducing methane emission up to 80%. This strain had nifH, vnfG and anfG, which are the Mo, V and Fe nitrogenase genes encoded for key enzymes in nitrogen fixation under different conditions...
December 28, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/28040467/proteomic-profile-of-susceptible-and-multidrug-resistant-clinical-isolates-of-escherichia-coli-and-klebsiella-pneumoniae-using-label-free-and-immunoproteomic-strategies
#4
Sandra Magalhães, Miguel Aroso, Inês Roxo, Sónia Ferreira, Frederico Cerveira, Elmano Ramalheira, Rita Ferreira, Rui Vitorino
Infectious diseases caused by multidrug-resistant (MDR) Enterobacteriaceae have exponentially increased in the past decade, and are a major concern in hospitals. In the first part of the work, we compared the proteome profile of MDR and susceptible clinical isolates of Escherichia coli and Klebsiella pneumoniae in order to identify possible biological processes associated with drug resistance and susceptible phenotypes, using a label-free approach. In the second part, we used an immunoproteomics approach to identify immunoreactive proteins in the same isolates...
December 28, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27965152/beneficial-and-detrimental-spore-formers-a-world-of-diversity
#5
EDITORIAL
Véronique Broussolle, Frédéric Carlin, Didier Lereclus, Christina Nielsen-LeRoux, Vincent Sanchis
No abstract text is available yet for this article.
December 10, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27965151/riptortus-pedestris-and-burkholderia-symbiont-an-ideal-model-system-for-insect-microbe-symbiotic-associations
#6
REVIEW
Kazutaka Takeshita, Yoshitomo Kikuchi
A number of insects establish symbiotic associations with beneficial microorganisms in various manners. The bean bug Riptortus pedestris and allied stink bugs possess an environmentally acquired Burkholderia symbiont in their midgut crypts. Unlike other insect endosymbionts, the Burkholderia symbiont is easily culturable and genetically manipulatable outside the host. In conjunction with the experimental advantages of the host insect, the Riptortus-Burkholderia symbiosis is an ideal model system for elucidating the molecular bases underpinning insect-microbe symbioses, which opens a new window in the research field of insect symbiosis...
December 10, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27884784/phenotypic-and-genomic-characterization-of-the-antimicrobial-producer-rheinheimera-sp-eprs3-isolated-from-the-medicinal-plant-echinacea-purpurea-insights-into-its-biotechnological-relevance
#7
Luana Presta, Emanuele Bosi, Marco Fondi, Isabel Maida, Elena Perrin, Elisangela Miceli, Valentina Maggini, Patrizia Bogani, Fabio Firenzuoli, Vincenzo Di Pilato, Gian Maria Rossolini, Alessio Mengoni, Renato Fani
In recent years, there has been increasing interest in plant microbiota; however, despite medicinal plant relevance, very little is known about their highly complex endophytic communities. In this work, we report on the genomic and phenotypic characterization of the antimicrobial compound producer Rheinheimera sp. EpRS3, a bacterial strain isolated from the rhizospheric soil of the medicinal plant Echinacea purpurea. In particular, EpRS3 is able to inhibit growth of different bacterial pathogens (Bcc, Acinetobacterbaumannii, and Klebsiellapneumoniae) which might be related to the presence of gene clusters involved in the biosynthesis of different types of secondary metabolites...
November 22, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27884783/secondary-multidrug-efflux-pump-mutants-alter-escherichia-coli-biofilm-growth-in-the-presence-of-cationic-antimicrobial-compounds
#8
Denice C Bay, Carol A Stremick, Carmine J Slipski, Raymond J Turner
Escherichia coli possesses many secondary active multidrug resistance transporters (MDTs) that confer overlapping substrate resistance to a broad range of antimicrobials via proton and/or sodium motive force. It is uncertain whether redundant MDTs uniquely alter cell survival when cultures grow planktonically or as biofilms. In this study, the planktonic and biofilm growth and antimicrobial resistance of 13 E. coli K-12 single MDT gene deletion strains in minimal and rich media were determined. Antimicrobial tolerance to tetracycline, tobramycin and benzalkonium were also compared for each ΔMDT strain...
November 22, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27884785/viable-but-non-culturable-state-and-toxin-gene-expression-of-enterohemorrhagic-escherichia-coli-o157-under-cryopreservation
#9
Junyan Liu, Rong Zhou, Lin Li, Brian M Peters, Bing Li, Chii-Wann Lin, Tsung-Liang Chuang, Dingqiang Chen, Xihong Zhao, Zhiyong Xiong, Zhenbo Xu, Mark E Shirtliff
As major food-borne pathogens worldwide, Escherichia coli are capable of toxin production directly causing severe human disease. However, routine methods are incapable of detecting viable but non-culturable (VBNC) bacteria in food products and raw materials, leading to false-negative identification. In this study, VBNC E. coli O157 strains were acquired after cryopreservation at -20 °C, with and without freeze-thawing; morphology was observed to be of shorter rod-shape, and toxin expression remained at relatively high levels...
November 21, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27884782/is-the-plant-associated-microbiota-of-thymus-spp-adapted-to-plant-essential-oil
#10
Alice Checcucci, Isabel Maida, Giovanni Bacci, Cristina Ninno, Anna Rita Bilia, Sauro Biffi, Fabio Firenzuoli, Guido Flamini, Renato Fani, Alessio Mengoni
We examined whether the microbiota of two related aromatic thyme species, Thymus vulgaris and Thymus citriodorus, differs in relation to the composition of the respective essential oil (EO). A total of 576 bacterial isolates were obtained from three districts (leaves, roots and rhizospheric soil). They were taxonomically characterized and inspected for tolerance to the EO from the two thyme species. A district-related taxonomic pattern was found. In particular, high taxonomic diversity among the isolates from leaves was detected...
November 21, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27845247/indole-3-acetic-acid-production-via-the-indole-3-pyruvate-pathway-by-plant-growth-promoter-rhizobium-tropici-ciat-899-is-strongly-inhibited-by-ammonium
#11
Eddie Luidy Imada, Amanda Alves de Paiva Rolla Dos Santos, André Luiz Martinez de Oliveira, Mariangela Hungria, Elisete Pains Rodrigues
Like many rhizobia, Rhizobium tropici produces indole-3-acetic acid (IAA), an important signal molecule required for root hair infection in rhizobia-legume symbioses. However, the IAA biosynthesis pathway and its regulation by R. tropici are still poorly understood. In this study, IAA synthesis and the effects of mineral N in IAA production by R. tropici CIAT 899 were verified by ultraperformance liquid chromatography-mass spectrometry (UPLC-MS). Furthermore, expression of genes related to IAA biosynthesis and metabolism were evaluated by RT-qPCR...
November 11, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27818282/isolation-of-bacteriophages-and-their-application-to-control-pseudomonas-aeruginosa-in-planktonic-and-biofilm-models
#12
Magdalena Kwiatek, Sylwia Parasion, Paweł Rutyna, Lidia Mizak, Romuald Gryko, Marcin Niemcewicz, Alina Olender, Małgorzata Łobocka
Pseudomonas aeruginosa is frequently identified as a cause of diverse infections and chronic diseases. It forms biofilms and has natural resistance to several antibiotics. Strains of this pathogen resistant to new-generation beta-lactams have emerged. Due to the difficulties associated with treating chronic P. aeruginosa infections, bacteriophages are amongst the alternative therapeutic options being actively researched. Two obligatorily lytic P. aeruginosa phages, vB_PaeM_MAG1 (MAG1) and vB_PaeP_MAG4 (MAG4), have been isolated and characterized...
November 4, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27810476/knowledge-of-the-physiology-of-spore-forming-bacteria-can-explain-the-origin-of-spores-in-the-food-environment
#13
Emilie Gauvry, Anne-Gabrielle Mathot, Ivan Leguérinel, Olivier Couvert, Florence Postollec, Véronique Broussolle, Louis Coroller
Spore-forming bacteria are able to grow under a wide range of environmental conditions, to form biofilms and to differentiate into resistant forms: spores. This resistant form allows their dissemination in the environment; consequently, they may contaminate raw materials. Sporulation can occur all along the food chain, in raw materials, but also in food processes, leading to an increase in food contamination. However, the problem of sporulation during food processing is poorly addressed and sporulation niches are difficult to identify from the farm to the fork...
November 1, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27810475/novel-insights-into-the-regulatory-roles-of-gene-hshb-in-xanthomonas-oryzae-pv-oryzicola
#14
Zhiwei Song, Yancun Zhao, Guoliang Qian, Benard Omondi Odhiambo, Fengquan Liu
Xanthomonas oryzae pv. oryzicola causes leaf streak disease of rice. The gene hshB is a newly identified virulence-associated gene that is co-regulated by diffusible signal factor signaling and global regulator Clp in X. oryzae pv. oryzicola. Our previous study showed that mutation of hshB remarkably impaired the virulence, extracellular protease activity, extracellular polysaccharide production and resistance to oxidative stress of X. oryzae pv. oryzicola. In this study, the regulatory role of hshB in X. oryzae pv ...
November 1, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27810477/comparative-genomics-of-extrachromosomal-elements-in-bacillus-thuringiensis-subsp-israelensis
#15
Alexandre Bolotin, Annika Gillis, Vincent Sanchis, Christina Nielsen-LeRoux, Jacques Mahillon, Didier Lereclus, Alexei Sorokin
Bacillus thuringiensis subsp. israelensis is one of the most important microorganisms used against mosquitoes. It was intensively studied following its discovery and became a model bacterium of the B. thuringiensis species. Those studies focused on toxin genes, aggregation-associated conjugation, linear genome phages, etc. Recent announcements of genomic sequences of different strains have not been explicitly related to the biological properties studied. We report data on plasmid content analysis of four strains using ultra-high-throughput sequencing...
October 31, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27989763/the-multifaceted-roles-of-leptospira-enolase
#16
Natália Salazar, Matilde Costa Lima de Souza, Amanda Gameiro Biasioli, Ludmila Bezerra da Silva, Angela Silva Barbosa
A previous study had demonstrated that Leptospira enolase is secreted extracellularly by a yet unknown mechanism and reassociates with the bacterial membrane. Surface-anchored leptospiral enolase displays plasminogen binding activity. In this work, we explored the consequences of this interaction and also assessed whether Leptospira enolase might display additional moonlighting functions by interacting with other host effector proteins. We first demonstrated that enolase-bound plasminogen is converted to its active form, plasmin...
October 28, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27989764/spore-forming-bacteria-responsible-for-food-spoilage
#17
Stéphane André, Tatiana Vallaeys, Stella Planchon
This review explores the main spore-forming bacteria involved in the spoilage of various processed foods. Bakery products are specifically spoiled by Bacillus species, the dominant one being Bacillus amyloliquefaciens, while different Clostridium species classically contaminate refrigerated vacuum-packed meats. These two genera have also been isolated from milk products, even when milk is pasteurized, sterilized, dehydrated or fermented, according to heat treatment and storage temperature. Finally, the most heat-resistant microorganisms are isolated in low-acid canned foods, the three predominant species being Geobacillus stearothermophilus, Moorella thermoacetica and Thermoanaerobacterium spp...
October 27, 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27492955/h-ns-an-overarching-regulator-of-the-vibrio-cholerae-life-cycle
#18
REVIEW
Julio C Ayala, Anisia J Silva, Jorge A Benitez
Vibrio cholerae has become a model organism for studies connecting virulence, pathogen evolution and infectious disease ecology. The coordinate expression of motility, virulence and biofilm enhances its pathogenicity, environmental fitness and fecal-oral transmission. The histone-like nucleoid structuring protein negatively regulates gene expression at multiple phases of the V. cholerae life cycle. Here we discuss: (i) the regulatory and structural implications of H-NS chromatin-binding in the two-chromosome cholera bacterium; (ii) the factors that counteract H-NS repression; and (iii) a model for the regulation of the V...
January 2017: Research in Microbiology
https://www.readbyqxmd.com/read/27639669/connecting-phenome-to-genome-in-pseudomonas-stutzeri-5190-an-artwork-biocleaning-bacterium
#19
Pilar Bosch-Roig, Francesca Decorosi, Luciana Giovannetti, Giancarlo Ranalli, Carlo Viti
Research on biotechnology applications for cultural heritage restoration has shown how microorganisms can be efficient at cleaning particularly complex or ingrained substances through the process called "biocleaning". Bacteria are able to synthesize groups of specific enzymes for the degradation of complex materials present on artwork. Biocleaning has been shown to be less hazardous than some traditional mechanical or chemical techniques for the artwork, to be environmentally-friendly and safe for restorers to use...
November 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27637152/indole-3-acetic-acid-in-plant-pathogen-interactions-a-key-molecule-for-in-planta-bacterial-virulence-and-fitness
#20
Matteo Cerboneschi, Francesca Decorosi, Carola Biancalani, Maria Vittoria Ortenzi, Sofia Macconi, Luciana Giovannetti, Carlo Viti, Beatrice Campanella, Massimo Onor, Emilia Bramanti, Stefania Tegli
The plant pathogenic bacterium Pseudomonas savastanoi, the causal agent of olive and oleander knot disease, uses the so-called "indole-3-acetamide pathway" to convert tryptophan to indole-3-acetic acid (IAA) via a two-step pathway catalyzed by enzymes encoded by the genes in the iaaM/iaaH operon. Moreover, pathovar nerii of P. savastanoi is able to conjugate IAA to lysine to generate the less biologically active compound IAA-Lys via the enzyme IAA-lysine synthase encoded by the iaaL gene. Interestingly, iaaL is now known to be widespread in many Pseudomonas syringae pathovars, even in the absence of the iaaM and iaaH genes for IAA biosynthesis...
November 2016: Research in Microbiology
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