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https://www.readbyqxmd.com/read/28240318/water-flow-buffers-shifts-in-bacterial-community-structure-in-heat-stressed-acropora-muricata
#1
Sonny T M Lee, Simon K Davy, Sen-Lin Tang, Paul S Kench
Deterioration of coral health and associated change in the coral holobiont's bacterial community are often a result of different environmental stressors acting synergistically. There is evidence that water flow is important for a coral's resistance to elevated seawater temperature, but there is no information on how water flow affects the coral-associated bacterial community under these conditions. In a laboratory cross-design experiment, Acropora muricata nubbins were subjected to interactive effects of seawater temperature (27 °C to 31 °C) and water flow (0...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28239422/differential-regulation-of-riboflavin-supply-genes-in-vibrio-cholerae
#2
Ignacio Sepúlveda Cisternas, Alexia Torres, Andrés Fuentes Flores, Víctor Antonio García Angulo
BACKGROUND: Riboflavin is the precursor of important redox cofactors such as flavin mononucleotide (FMN) and flavin adenine dinucleotide, required for several biological processes. Vibrio cholerae, a pathogenic bacterium responsible for the cholera disease, possesses the ability to biosynthesize de novo as well as to uptake riboflavin through the riboflavin biosynthetic pathway (RBP) and the RibN importer, respectively. The intra-organism relationship between riboflavin biosynthesis and uptake functions has not been studied...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28238878/characterization-and-expression-analysis-of-serpinb3-the-first-clade-b-serine-protease-inhibitor-in-pacific-white-shrimp-litopenaeus-vannamei
#3
Yongjie Liu, Fujun Hou, Xiaolin Liu
Currently, about nine serpin clades (A-I) were preferentially observed in higher animals and clustered on the basis of function. Of these, eight clades contain extracellular proteins, while clade B contains predominantly intracellular proteins. In the present study, the first clade B serpin (named LvserpinB3) was identified from the Pacific white shrimp Litopenaeus vannamei. LvserpinB3 encoded a 412-amino acid protein with a 19-amino acid signal peptide and a serpin domain. Moreover, a transmembrane helix (TMHs) was predicted to be located on the N-terminal of LvserpinB3...
February 23, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28236687/fe-iii-and-fe-ii-induced-photodegradation-of-nonylphenol-polyethoxylate-npeo-oligomer-in-aqueous-solution-and-toxicity-evaluation-of-the-irradiated-solution
#4
Lei Wang, Junjie Zhang, Zhenghua Duan, Hongwen Sun
Photodegradation of nonylphenol tri-ethoxylate (NPEO3) in aqueous solution, and the effects of Fe(III) or Fe(II) were studied. The increasing degradation kinetics of NPEO3 were observed when 500µM Fe(III) or Fe(II) was present in the solutions. Altered formation of NPEO oligomers with shorter EO chains, including nonyphenol (NP), NPEO1 and NPEO2, was observed in water and in solutions containing Fe(III) or Fe(II). The molar percentage yields of NP and NPEO1,2 production from NPEO3 photodegradation were approximately 20% in NPEO3 solution, while NPEO3 solution with Fe(III), this percentage increased to approximately 50%...
February 22, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28236646/an-invertebrate-sting-from-shrimp-activates-an-innate-immune-defense-against-bacterial-infection
#5
Haoyang Li, Sheng Wang, Kai Lǚ, Bin Yin, Bang Xiao, Sedong Li, Jianguo He, Chaozheng Li
It has been proposed that invertebrate stimulators of interferon genes (STINGs) do not take part in the innate immune response to infection. Herein, we identified a new STING homolog from pacific white shrimp Litopenaeus vannamei (LvSTING). Some amino acids crucial for recognizing cyclic dinucleotides in mammals are highly conserved in LvSTING. Moreover, LvSTING expression can be robustly induced by challenge with the Gram-negative bacteria Vibrio parahaemolyticus. Silencing of LvSTING contributes to decreased expression of the antimicrobial peptide PEN4 and renders shrimp more susceptible to V...
February 25, 2017: FEBS Letters
https://www.readbyqxmd.com/read/28235640/groel-pcr-rflp-an-efficient-tool-to-discriminate-closely-related-pathogenic-vibrio-species
#6
Reshma Silvester, Deborah Alexander, Ally C Antony, Mohamed Hatha
Vibrio sp. are autochthonous to marine and estuarine waters. Several species of Vibrio are pathogens. It is of utmost importance to detect and discriminate the Vibrio sp. that are often involved in food and water borne infections. Since 16S rRNA based identification has limited utility in differentiating the closely related pathogenic species from non pathogenic species, we have evaluated the discriminatory power of groEL PCR-RFLP for identification of closely related Vibrio sp. Accordingly, in the current study, the efficiency of groEL PCR- RFLP for detection and accurate differentiation of known pathogens among Vibrio sp...
February 21, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28235638/immune-response-and-antioxidant-status-of-portunus-trituberculatus-inoculated-with-pathogens
#7
Xianyun Ren, Jianjian Lv, Baoquan Gao, Jian Li, Ping Liu
The white spot syndrome virus (WSSV), Vibrio parahaemolyticus and V. alginolyticus are serious epidemic pathogen affecting the cultured Portunus trituberculatus and resulted in severe economic losses to local farmers. The immune and antioxidant systems are believed to be closely involved in host responses to pathogens in aerobic animals, including crustaceans. In order to explore such host-pathogen interactions in the early stage of infection in P. trituberculatus, the mRNA transcript levels of six key immune-related genes (proPO, α2M, crustin, lysozyme, NOS, and NOX) and three key antioxidant-related genes (CuZnSOD, CAT, and GPx) and their corresponding enzymatic activity were investigated in response to challenge with the three pathogens...
February 21, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28231272/vibrio-japonicus-sp-nov-a-novel-member-of-the-nereis-clade-in-the-genus-vibrio-isolated-from-the-coast-of-japan
#8
Hiroyasu Doi, Ikuko Osawa, Hayamitsu Adachi, Manabu Kawada
A novel Vibrio strain, JCM 31412T, was isolated from seawater collected from the Inland Sea (Setonaikai), Japan, and characterized as a Gram-negative, oxidase-positive, catalase-negative, facultatively anaerobic, motile, ovoid-shaped bacterium with one polar flagellum. Based on 16S rDNA gene identity, strain JCM 31412T showed a close relationship with type strains of Vibrio brasiliensis (LMG 20546T, 98.2% identity), V. harveyi (NBRC 15634T, 98.2%), V. caribbeanicus (ATCC BAA-2122T, 97.8%) and V. proteolyticus (NBRC 13287T, 97...
2017: PloS One
https://www.readbyqxmd.com/read/28228329/stringent-factor-and-proteolysis-control-of-sigma-factor-rpos-expression-in-vibrio-cholerae
#9
Philipp Wurm, Sarah Tutz, Beatrice Mutsam, Dina Vorkapic, Barbara Heyne, Claudia Grabner, Katharina Kleewein, Anja Halscheidt, Stefan Schild, Joachim Reidl
Vibrio cholerae can colonize the gastrointestinal track of humans and cause the disease cholera. During colonization, the alternative sigma factor, RpoS, controls a process known as "mucosal escape response," defining a specific spatial and temporal response and effecting chemotaxis and motility. In this report, the expression and proteolytic control of RpoS in V. cholerae was characterized. To date, aspects of proteolysis control, the involved components, and proteolysis regulation have not been addressed for RpoS in V...
February 7, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/28223161/molecular-characterization-of-pacific-oyster-crassostrea-gigas-irak4-gene-and-its-role-in-myd88-dependent-pathway
#10
Xueying Tang, Baoyu Huang, Linlin Zhang, Li Li, Guofan Zhang
Interleukin-1 receptor-associated kinases (IRAKs) play important roles in MyD88-dependent TLR signaling, the crucial innate immune pathway in molluscs. In this study, we examined the full-length IRAK4 genetic sequence in the Pacific oyster (Crassostrea gigas) by molecular cloning. Phylogenetic analysis revealed that CgIRAK4 is most closely related to Mytilus edulis, and forms a clade with other molluscs. CgIRAK4 transcripts are widely expressed in all tissues, with the highest expression observed in the hemocytes and gill...
February 13, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28221954/molecular-detection-of-the-three-major-pathogenic-vibrio-species-from-seafood-products-and-sediments-in-tunisia-using-real-time-pcr
#11
Morsi Gdoura, Hanen Sellami, Hanen Nasfi, Rahma Trabelsi, Sabeur Mansour, Touraya Attia, Siwar Nsaibia, Tatiana Vallaeys, Radhouane Gdoura, Mariam Siala
: Vibrio spp. have emerged as a serious threat to human health worldwide. V. parahaemolyticus , V. cholerae , and V. vulnificus pose a considerable public health risk in Tunisia because they cause sporadic and epidemic foodborne infections associated with the consumption of raw or undercooked contaminated seafood. More recently, toxR-positive V. alginolyticus was also reported to be a potential source of contaminated seafood. A total of 247 samples, including 113 fishes ( Labrus viridis , Penaeus kerathurus , Diplodus annularis , Diplodus sparaillon , Scorparna porcus , Sarpa salpa , Dentex dentex , Scorparna scrofa , Sardinella aurita , Trachurus trachurus , Synodus saurus , Pagellus erythrinus , and Metapenaeus monoceros ), 83 clams ( Ruditapes decussatus species), 30 seawater samples, and 21 sediment samples were analyzed using traditional culture methods (ISO/TS 21872-1; International Organization for Standardization 2007) and a conventional PCR method for Vibrio spp...
December 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28219321/genetic-characterization-of-vibrio-cholerae-o1-isolates-from-outbreaks-between-2011-and-2015-in-tanzania
#12
Yazid Kachwamba, A A Mohammed, H Lukupulo, L Urio, M Majigo, F Mosha, M Matonya, R Kishimba, J Mghamba, J Lusekelo, S Nyanga, M Almeida, S Li, D Domman, S Y Massele, O C Stine
BACKGROUND: Cholera outbreaks have occurred in Tanzania since 1974. To date, the genetic epidemiology of these outbreaks has not been assessed. METHODS: 96 Vibrio cholerae O1 isolates from five regions were characterized, and their genetic relatedness assessed using multi-locus variable-number tandem-repeat analysis (MLVA) and whole genome sequencing (WGS). RESULTS: Of the 48 MLVA genotypes observed, 3 were genetically unrelated to any others, while the remaining 45 genotypes separated into three MLVA clonal complexes (CCs) - each comprised of genotypes differing by a single allelic change...
February 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28216648/structure-and-dynamics-of-type-iii-periplasmic-proteins-vcfhud-and-vchutb-reveal-molecular-basis-of-their-distinctive-ligand-binding-properties
#13
Shubhangi Agarwal, Sanjay Dey, Biplab Ghosh, Maitree Biswas, Jhimli Dasgupta
Molecular mechanisms of xenosiderophore and heme acquisitions using periplasmic binding protein (PBP) dependent ATP-binding cassette transporters to scavenge the essential nutrient iron are elusive yet in Vibrio cholerae. Our current study delineates the structures, dynamics and ligand binding properties of two Type III PBPs of V. cholerae, VcFhuD and VcHutB. Through crystal structures and fluorescence quenching studies we demonstrate unique features of VcFhuD to bind both hydroxamate and catecholate type xenosiderophores...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28215703/structure-and-function-of-vibrio-cholerae-accessory-cholera-enterotoxin-in-presence-of-gold-nanoparticles-dependence-on-morphology
#14
Tanaya Chatterjee, Barun K Chatterjee, Tultul Saha, Kazi Mirajul Hoque, Pinak Chakrabarti
BACKGROUND: Accessory cholera enterotoxin (Ace) is a classical enterotoxin produced by Vibrio cholerae, the causative agent for cholera. Considering the crucial role of Ace in pathogenesis of cholera, we explored the modulation of structure/function of Ace using gold nanoparticles (AuNPs) of different size and shape - spherical (AuNS10 and AuNS100, the number indicating the diameter in nm) and rod (AuNR10). METHODS: Biophysical techniques have been used to find out structural modulation of Ace by AuNPs...
February 12, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28215587/surface-expression-of-helicobacter-pylori-hpaa-adhesion-antigen-on-vibrio-cholerae-enhanced-by-co-expressed-enterotoxigenic-escherichia-coli-fimbrial-antigens
#15
Joshua Tobias, Michael Lebens, Sun Nyunt Wai, Jan Holmgren, Ann-Mari Svennerholm
Helicobacter pylori infection can cause peptic ulceration and is associated with gastric adenocarcinoma. This study aimed to construct and characterize a non-virulent Vibrio cholerae O1 strain, which grows more rapidly than H. pylori, as vector for H. pylori antigens for possible use as a vaccine strain against H. pylori. This was done by recombinant expression of the H. pylori adhesion antigen HpaA alone or, as a proof of principle, together with different colonization factor (CF) antigens of enterotoxigenic Escherichia coli (ETEC) which may enhance immune responses against HpaA...
February 16, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28214599/hctoll3-was-involved-in-anti-vibrio-defense-in-freshwater-pearl-mussel-hyriopsis-cumingii
#16
Hong-Wei Zhang, Ying Huang, Xin Man, Yue Wang, Kai-Min Hui, Shao-Wu Yin, Xiao-Wen Zhang
Toll-like receptors (TLRs) play an important role in the activation of innate immune response but their functions in bivalves remain largely unknown. In this study, we identified a TLR from the freshwater pearl mussel Hyriopsis cumingii (HcToll3) and investigated its functions in immunity. The full-length cDNA of HcToll3 is 3852 bp and includes an open reading frame (ORF) of 3228 bp that encodes a polypeptide of 1075 amino acids. The predicted HcToll3 protein shares similar structural characteristics with other known Toll family proteins...
February 16, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28211298/kinneretia-thg-sqi4-mediated-biosynthesis-of-silver-nanoparticles-and-its-antimicrobial-efficacy
#17
Hina Singh, Juan Du, Tae-Hoo Yi
Simple, facile, effective approach for the biosynthesis of silver nanoparticles using Kinneretia species and its antimicrobial activity against human pathogens has been demonstrated in this study. Kinneretia THG-SQI4 has been isolated from soil sample collected from Shangqui, China. The synthesized nanoparticles were characterized by ultraviolet-visible spectrophotometry (UV-vis), field emission transmission electron microscopy (FE-TEM), energy dispersive X-ray spectroscopy (EDX), elemental mapping, selected area diffraction pattern, and X-ray diffraction (XRD)...
May 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28210461/the-epidemiology-and-antimicrobial-resistance-of-cholera-cases-in-iran-during-2013
#18
Hossein Masoumi-Asl, Mohammad Mehdi Gouya, Mohammad Rahbar, Roghieh Sabourian
BACKGROUND AND OBJECTIVES: Cholera is an endemic diarrheal disease in Iran, caused by Vibrio Cholerae. The epidemiology, transmission route, environmental determinants and antimicrobial resistant pattern of cholera have been changed during recent years. In this study the epidemiology and antimicrobial resistance of cholera in Iran during 2013 outbreak was investigated. MATERIALS AND METHODS: A retrospective, cross-sectional study was carried out using cholera national surveillance system collected data in 2013...
August 2016: Iranian Journal of Microbiology
https://www.readbyqxmd.com/read/28209836/draft-genome-sequence-of-a-vibrio-harveyi-strain-associated-with-vibriosis-in-pacific-white-shrimp-litopenaeus-vannamei
#19
Emille Moreno, Marci Parks, Lee J Pinnell, James J Tallman, Jeffrey W Turner
Vibrio harveyi is a Gram-negative bacterium associated with vibriosis in penaeid shrimp. Here, we report the draft genome sequence of a V. harveyi strain isolated from Pacific white shrimp (Litopenaeus vannamei) during a vibriosis outbreak. The availability of this genome will aid future studies of vibriosis in shrimp aquaculture.
February 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28207310/microbiological-quality-and-prevalence-of-%C3%AE-lactam-antibiotic-resistance-genes-in-oysters-crassostrea-rhizophorae
#20
Maria Aparecida da RessurreiÇão Brandão, Amanda Teixeira Sampaio Lopes, Maria Tereza da Silva Neta, Rhyan Barros Farias de Oliveira, Rachel Passos Rezende, George Rêgo Albuquerque, Verônica Dias Gonçalves, Dália Dos Prazeres Rodrigues, Guisla Boehs, Bianca Mendes Maciel
The microbiological quality of oysters reflects the microbiological quality of their habitats because they are filter feeders. The objective of this study was to assess the bacterial composition of the edible oyster Crassostrea rhizophorae in urban and preserved estuaries. Particularly, we assessed the presence of pathogenic bacteria, investigated antibiotic susceptibility in bacterial isolates, and quantified β-lactam antibiotic resistance genes (blaTEM, blaSHV, and blaKPC) via quantitative PCR of oyster DNA...
February 16, 2017: Journal of Food Protection
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