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https://www.readbyqxmd.com/read/27932023/molecular-cloning-and-expression-analysis-of-a-fish-specific-interferon-regulatory-factor-irf11-in-orange-spotted-grouper-epinephelus-coioides
#1
Wen Shu Huang, Mei Hua Zhu, Shan Chen, Zhi Xuan Wang, Ying Liang, Bei Huang, P Nie
Interferon regulatory factors (IRFs) are transcription mediators which play vital roles in multiple biological processes, such as antiviral defense, immune response, cell growth regulation and apoptosis. A fish specific IRF, termed IRF11, has been identified in previous study through searching fish genome databases. Herein, a transcript of IRF11, EcIRF11 was cloned from orange-spotted grouper, Epinephelus coioides. The EcIRF11 cDNA sequence has 1573 bp in length, encoding a putative protein of 261 amino acids, with a high degree of similarity found between EcIRF11 and its teleost counterparts...
December 5, 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/27924278/domain-based-biophysical-characterization-of-the-structural-and-thermal-stability-of-flig-an-essential-rotor-component-of-the-na-driven-flagellar-motor
#2
Yasuhiro Onoue, Rei Abe-Yoshizumi, Mizuki Gohara, Yuuki Nishino, Shiori Kobayashi, Yasuo Asami, Michio Homma
Many bacteria move using their flagellar motor, which generates torque through the interaction between the stator and rotor. The most important component of the rotor for torque generation is FliG. FliG consists of three domains: FliGN, FliGM, and FliGC. FliGC contains a site(s) that interacts with the stator. In this study, we examined the physical properties of three FliG constructs, FliGFull, FliGMC, and FliGC, derived from sodium-driven polar flagella of marine Vibrio. Size exclusion chromatography revealed that FliG changes conformational states under two different pH conditions...
2016: Biophysics and Physicobiology
https://www.readbyqxmd.com/read/27923919/quorum-sensing-coordinates-cooperative-expression-of-pyruvate-metabolism-genes-to-maintain-a-sustainable-environment-for-population-stability
#3
Lisa A Hawver, Jennifer M Giulietti, James D Baleja, Wai-Leung Ng
: Quorum sensing (QS) is a microbial cell-cell communication system that regulates gene expression in response to population density to coordinate collective behaviors. Yet, the role of QS in resolving the stresses caused by the accumulation of toxic metabolic by-products at high cell density is not well defined. In response to cell density, QS could be involved in reprogramming of the metabolic network to maintain population stability. Using unbiased metabolomics, we discovered that Vibrio cholerae mutants genetically locked in a low cell density (LCD) QS state are unable to alter the pyruvate flux to convert fermentable carbon sources into neutral acetoin and 2,3-butanediol molecules to offset organic acid production...
December 6, 2016: MBio
https://www.readbyqxmd.com/read/27923270/comparison-of-antibody-immobilization-strategies-in-detection-of-vibrio-cholerae-by-surface-plasmon-resonance
#4
Ramezan Ali Taheri, Ali Hossein Rezayan, Fereshteh Rahimi, Javad Mohammadnejad, Mehdi Kamali
Surface plasmon resonance immunosensor for the detection of bacterial cells was first reported in 1998 with high detection limit as much as 10(7 )cfu/ml. Since then, many efforts have been made aiming to lower the detection limit and improve the sensitivity of detection. The aim of this study was to compare the effect of four most frequently used immobilization strategies, including direct physical adsorption (physisorption), covalent immobilization via self-assembled monolayer (SAM) formation, bioaffinity immobilization using protein G-mediated immobilization and using mixed SAM of alkane thiols on signal strength of detection of Vibrio cholerae using these modified surfaces...
December 6, 2016: Biointerphases
https://www.readbyqxmd.com/read/27923189/sensitive-immunoassay-based-detection-of-vibrio-parahaemolyticus-using-capture-and-labeling-particles-in-a-stationary-liquid-phase-lab-on-a-chip
#5
Byunghee Park, Suk-Jung Choi
In the present study, a method was developed for detection of Vibrio parahaemolyticus based on a stationary liquid phase lab-on-a-chip (SLP LOC). The present SLP LOC comprises a sample chamber, washing chamber, and detection chamber connected by two channels. The method utilizes two types of particles: capture particles (CPs), which are magnetic nanoparticles functionalized with antibody; and labeling particles (LPs), which are silica nanoparticles functionalized with horseradish peroxidase and antibody. Samples were added to the sample chamber with CPs and LPs, forming a CP-bacteria-LP complex, and the complex was transported to the detection chamber containing chromogenic substrate solution...
December 1, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27922600/vibrio-crassostreae-a-benign-oyster-colonizer-turned-into-a-pathogen-after-plasmid-acquisition
#6
Maxime Bruto, Adèle James, Bruno Petton, Yannick Labreuche, Sabine Chenivesse, Marianne Alunno-Bruscia, Martin F Polz, Frédérique Le Roux
Vibrios are frequently associated with oyster mortality; however whether they are the primary causative agent or secondary opportunistic colonizers is not well understood. Here we combine analysis of natural infection dynamics, population genomics and molecular genetics to ask (i) to what extent oysters are passively colonized by Vibrio population present in the surrounding water, (ii) how populations turn over during pathogenicity events and (iii) what genetic factors are responsible for pathogenicity. We identified several populations of Vibrio preferentially associated with oyster tissues...
December 6, 2016: ISME Journal
https://www.readbyqxmd.com/read/27922599/direct-single-cell-biomass-estimates-for-marine-bacteria-via-archimedes-principle
#7
Nathan Cermak, Jamie W Becker, Scott M Knudsen, Sallie W Chisholm, Scott R Manalis, Martin F Polz
Microbes are an essential component of marine food webs and biogeochemical cycles, and therefore precise estimates of their biomass are of significant value. Here, we measured single-cell biomass distributions of isolates from several numerically abundant marine bacterial groups, including Pelagibacter (SAR11), Prochlorococcus and Vibrio using a microfluidic mass sensor known as a suspended microchannel resonator (SMR). We show that the SMR can provide biomass (dry mass) measurements for cells spanning more than two orders of magnitude and that these estimates are consistent with other independent measures...
December 6, 2016: ISME Journal
https://www.readbyqxmd.com/read/27922123/lptd-is-a-promising-vaccine-antigen-and-potential-immunotherapeutic-target-for-protection-against-vibrio-species-infection
#8
Zhenzhong Zha, Chuchu Li, Weiyan Li, Zhicang Ye, Jianyi Pan
Outer membrane proteins (OMPs) are unique to Gram-negative bacteria. Several features, including surface exposure, conservation among strains and ability to induce immune responses, make OMPs attractive targets for using as vaccine antigens and immunotherapeutics. LptD is an essential OMP that mediates the final transport of lipopolysaccharide (LPS) to outer leaflet. The protein in Vibrio parahaemolyticus was identified to have immunogenicity in our previous report. In this study, broad distribution, high conservation and similar surface-epitopes of LptD were found among the major Vibrio species...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921342/cross-protection-against-vibrio-cholerae-infection-by-monoclonal-antibodies-against-vibrio-vulnificus-rtxa1-martxvv
#9
Tae Hee Lee, Sun-Shin Cha, Chang-Seop Lee, Joon Haeng Rhee, Hye Ryun Woo, Kyung Min Chung
Gram-negative Vibrio species secrete multifunctional autoprocessing repeats-in-toxin (MARTX) toxins associated with bacterial pathogenesis. Here, the cross-reactivity and cross-protectivity of mAbs against V. vulnificus RtxA1/MARTXVv was evaluated. Passive administration of any of these mAbs (21RA, 24RA, 46RA, 47RA and 50RA) provided strong protection against lethal V. cholerae infection. Interestingly, 24RA and 46RA, which map to the cysteine protease domain of V. cholerae MARTXVc , inhibited CPD autocleavage in vitro; this process is involved in V...
November 2016: Microbiology and Immunology
https://www.readbyqxmd.com/read/27919756/molecular-identification-and-functional-delineation-of-a-glutathione-reductase-homologue-from-disk-abalone-haliotis-discus-discus-insights-as-a-potent-player-in-host-antioxidant-defense
#10
H M L P B Herath, P D S U Wickramasinghe, S D N K Bathige, R G P T Jayasooriya, Gi-Young Kim, Myoung Ae Park, Chul Kim, Jehee Lee
Glutathione reductase (GSR) is an enzyme that catalyzes the biochemical conversion of oxidized glutathione (GSSG) into the reduced form (GSH). Since the ratio between the two forms of glutathione (GSH/GSSG) is important for the optimal function of GSH to act as an antioxidant against H2O2, the contribution of GSR as an enzymatic regulatory agent to maintain the proper ratio is essential. Abalones are marine mollusks that frequently encounter environmental factors that can trigger the overproduction of reactive oxygen species (ROS) such as H2O2...
December 2, 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/27918423/potentiometric-aptasensing-of-vibrio-alginolyticus-based-on-dna-nanostructure-modified-magnetic-beads
#11
Guangtao Zhao, Jiawang Ding, Han Yu, Tanji Yin, Wei Qin
A potentiometric aptasensing assay that couples the DNA nanostructure-modified magnetic beads with a solid-contact polycation-sensitive membrane electrode for the detection of Vibrio alginolyticus is herein described. The DNA nanostructure-modified magnetic beads are used for amplification of the potential response and elimination of the interfering effect from a complex sample matrix. The solid-contact polycation-sensitive membrane electrode using protamine as an indicator is employed to chronopotentiometrically detect the change in the charge or DNA concentration on the magnetic beads, which is induced by the interaction between Vibrio alginolyticus and the aptamer on the DNA nanostructures...
December 2, 2016: Sensors
https://www.readbyqxmd.com/read/27917880/actin-activates-pseudomonas-aeruginosa-exoy-nucleotidyl-cyclase-toxin-and-exoy-like-effector-domains-from-martx-toxins
#12
Alexander Belyy, Dorothée Raoux-Barbot, Cosmin Saveanu, Abdelkader Namane, Vasily Ogryzko, Lina Worpenberg, Violaine David, Veronique Henriot, Souad Fellous, Christien Merrifield, Elodie Assayag, Daniel Ladant, Louis Renault, Undine Mechold
The nucleotidyl cyclase toxin ExoY is one of the virulence factors injected by the Pseudomonas aeruginosa type III secretion system into host cells. Inside cells, it is activated by an unknown eukaryotic cofactor to synthesize various cyclic nucleotide monophosphates. ExoY-like adenylate cyclases are also found in Multifunctional-Autoprocessing Repeats-in-ToXin (MARTX) toxins produced by various Gram-negative pathogens. Here we demonstrate that filamentous actin (F-actin) is the hitherto unknown cofactor of ExoY...
December 5, 2016: Nature Communications
https://www.readbyqxmd.com/read/27917206/anticancer-and-antibacterial-secondary-metabolites-from-the-endophytic-fungus-penicillium-sp-cam64-against-multi-drug-resistant-gram-negative-bacteria
#13
Jean-Bosco Jouda, Jean-de-Dieu Tamokou, Céline Djama Mbazoa, Prodipta Sarkar, Prasanta Kumar Bag, Jean Wandji
BACKGROUND: The emergence of multiple-drug resistance bacteria has become a major threat and thus calls for an urgent need to search for new effective and safe anti-bacterial agents. OBJECTIVES: This study aims to evaluate the anticancer and antibacterial activities of secondary metabolites from Penicillium sp., an endophytic fungus associated with leaves of Garcinia nobilis. METHODS: The culture filtrate from the fermentation of Penicillium sp...
September 2016: African Health Sciences
https://www.readbyqxmd.com/read/27916412/kinetics-of-antibody-secreting-cell-and-fecal-iga-responses-after-oral-cholera-vaccination-in-different-age-groups-in-a-cholera-endemic-country
#14
Marjahan Akhtar, Firdausi Qadri, Taufiqur R Bhuiyan, Sarmin Akter, Tanzeem A Rafique, Arifuzzaman Khan, Laila N Islam, Amit Saha, Ann-Mari Svennerholm, Anna Lundgren
Immune responses to oral enteric vaccines in children and infants may be influenced by factors such as age, previous priming with related microorganisms and breast feeding. In this study, we aimed to determine optimal time points to assess immune responses to oral enteric vaccines in different clinical specimens. This was done by investigating antibody secreting cell (ASC) and fecal antibody responses on different days after vaccination using the licensed oral cholera vaccine Dukoral, containing cholera toxin B-subunit (rCTB) and inactivated Vibrio cholerae bacteria, as a model vaccine...
December 1, 2016: Vaccine
https://www.readbyqxmd.com/read/27916262/effect-of-co-application-of-nano-zero-valent-iron-and-biochar-on-the-total-and-freely-dissolved-polycyclic-aromatic-hydrocarbons-removal-and-toxicity-of-contaminated-soils
#15
Patryk Oleszczuk, Michał Kołtowski
The aim of this study was to investigate co-application of biochar and nano zero-valent iron (nZVI) in order to increase the degradation of PAHs and reduce the toxicity of soils historically contaminated with these compounds. To performed the experiment biochar, biochar with nZVI (2 g kg(-1) or 10 g kg(-1) soil), or nZVI alone (2 g kg(-1) or 10 g kg(-1) soil) were added to the PAHs contaminated soils. The soils alone and soils with amendments were aged by mixing for 7 and 30 days. After that the chemical analysis were carried out and total (Ctot) and Cfree PAH content in the samples were determined...
December 1, 2016: Chemosphere
https://www.readbyqxmd.com/read/27915375/identification-of-enzymes-responsible-for-extracellular-alginate-depolymerization-and-alginate-metabolism-in-vibrio-algivorus
#16
Hidetaka Doi, Yuriko Tokura, Yukiko Mori, Kenichi Mori, Yoko Asakura, Yoshihiro Usuda, Hiroo Fukuda, Akito Chinen
Alginate is a marine non-food-competing polysaccharide that has potential applications in biorefinery. Owing to its large size (molecular weight >300,000 Da), alginate cannot pass through the bacterial cell membrane. Therefore, bacteria that utilize alginate are presumed to have an enzyme that degrades extracellular alginate. Recently, Vibrio algivorus sp. SA2(T) was identified as a novel alginate-decomposing and alginate-utilizing species. However, little is known about the mechanism of alginate degradation and metabolism in this species...
December 3, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27915250/importance-of-fumarate-and-nitrate-reduction-regulatory-protein-for-proliferation-for-intestinal-proliferation-of-vibrio-vulnificus
#17
Takehiro Kado, Takashige Kashimoto, Kohei Yamazaki, Shunji Ueno
The sepsis caused by Vibrio vulnificus is characterized by an average incubation period of 26 hours and a high mortality rate exceeding 50%. The fast growth and dissemination of V. vulnificus in vivo lead to poor clinical outcomes in patients. Therefore, elucidation of the proliferation mechanisms of this organism in vivo may lead to development of an effective therapeutic strategy. In this study, we focused on the low oxygen concentration in the intestinal milieu because of its drastic difference from that in the air...
December 2, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27913018/potential-impact-of-flowback-water-from-hydraulic-fracturing-on-agricultural-soil-quality-metal-metalloid-bioaccessibility-microtox-bioassay-and-enzyme-activities
#18
Season S Chen, Yuqing Sun, Daniel C W Tsang, Nigel J D Graham, Yong Sik Ok, Yujie Feng, Xiang-Dong Li
Hydraulic fracturing has advanced the development of shale gas extraction, while inadvertent spills of flowback water may pose a risk to the surrounding environment due to its high salt content, metals/metalloids (As, Se, Fe and Sr), and organic additives. This study investigated the potential impact of flowback water on four representative soils from shale gas regions in Northeast China using synthetic flowback solutions. The compositions of the solutions were representative of flowback water arising at different stages after fracturing well establishment...
November 29, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27911360/development-of-a-more-sensitive-and-specific-chromogenic-agar-medium-for-the-detection-of-vibrio-parahaemolyticus-and-other-vibrio-species
#19
Marie Yeung, Trevor Thorsen
Foodborne infections in the US caused by Vibrio species have shown an upward trend. In the genus Vibrio, V. parahaemolyticus is responsible for the majority of Vibrio-associated infections. Thus, accurate differentiation among Vibrio spp. and detection of V. parahaemolyticus is critically important to ensure the safety of our food supply. Although molecular techniques are increasingly common, culture-depending methods are still routinely done and they are considered standard methods in certain circumstances...
November 8, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910791/effects-of-ethyl-acetate-extracts-from-the-polycephalomyces-nipponicus-isolate-cod-mk1201-ascomycetes-against-human-pathogenic-bacteria-and-a-breast-cancer-cell-line
#20
Kusavadee Sangdee, Prapairat Seephonkai, Benjaporn Buranrat, Nilawan Surapong, Aphidech Sangdee
This study aimed to identify a suitable organic solvent for extracting bioactive compounds from Polycephalomyces nipponicus and to evaluate the antibacterial and anticancer activities of the extracts obtained. Only extracts obtained with ethyl acetate exhibited antibacterial activity, so ethyl acetate was chosen for large-scale extraction. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against Gram-positive and Gram-negative human pathogenic bacteria of the 3 ethyl acetate-derived extracts-ethyl acetate extract from P...
2016: International Journal of Medicinal Mushrooms
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