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https://www.readbyqxmd.com/read/29235980/restoration-of-glycoprotein-erns-dimerization-via-pseudoreversion-partially-restores-virulence-of-classical-swine-fever-virus
#1
Anna Katharina Tucakov, Sabine Yavuz, Eva-Maria Schürmann, Manjula Mischler, Anne Klingebeil, Gregor Meyers
The classical swine fever virus (CSFV) represents one of the most important pathogens of swine. The CSFV glycoprotein Erns is an essential structural protein and an important virulence factor. The latter is dependent on the RNase activity of this envelope protein and, most likely, its secretion from the infected cell. A further important feature with regard to its function as a virulence factor is the formation of disulfide-linked Erns homodimers that are found in virus-infected cells and virions. Mutant CSFV lacking cysteine (Cys) 171, the residue responsible for intermolecular disulfide bond formation, were found to be attenuated in pigs (Tews BA, Schürmann EM, Meyers G...
December 13, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/29235706/a-conserved-tad-pilus-promotes-vibrio-vulnificus-oyster-colonization
#2
Meng Pu, Patrick Duriez, Mattan Arazi, Dean A Rowe-Magnus
Vibrio vulnificus has the highest death rate (>35%) and per-case economic burden ($3.3 million) of any foodborne pathogen in the US. Infections occur via open wounds or following ingestion of contaminated seafood, most infamously oysters. We isolated a 1000th generation descendant, designated NT, that exhibited increased biofilm and aggregate formation relative to its parent. We identified two significant causal changes underlying these NT phenotypes. First, the entire 24-kb capsular polysaccharide biosynthesis locus, which is essential for virulence but inhibits biofilm formation, had been purged from the genome...
December 13, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29235397/leptospira-interrogans-outer-membrane-protein-lipl21-is-a-potent-inhibitor-of-neutrophil-myeloperoxidase
#3
Monica L Vieira, Aline F Teixeira, Giselle Pidde-Queiroz, Ana T C Ching, Denise V Tambourgi, Ana Lucia T O Nascimento, Heiko Herwald
Leptospirosis is a widespread zoonotic and neglected infectious disease of human and veterinary concern that is caused by pathogenic Leptospira species. After entrance in the host, pathogenic leptospires evade the host natural defense mechanisms in order to propagate and disseminate to multiple organs. Myeloperoxidase is an enzyme stored in neutrophils azurophilic granules, and is released upon neutrophil activation to produce mainly hypochlorous acid, a strong oxidant and potent antimicrobial agent. In the present investigation, we studied the modulation of myeloperoxidase activity by L...
December 13, 2017: Virulence
https://www.readbyqxmd.com/read/29235265/synthesis-of-%C3%AE-branched-acyclic-nucleoside-phosphonates-as-potential-inhibitors-of-bacterial-adenylate-cyclases
#4
Jan Frydrych, Jan Skácel, Markéta Šmídková, Helena Mertlíková-Kaiserová, Martin Dračínský, Ramachandran Gnanasekaran, Martin Lepšík, Monica Soto-Velasquez, Val J Watts, Zlatko Janeba
Inhibition of Bordetella pertussis adenylate cyclase toxin (ACT) and Bacillus anthracis edema factor (EF), the key virulence factors with adenylate cyclase (AC) activity, represents a potential method how to treat or prevent toxemia related to whooping cough and anthrax, respectively. A novel series of α-branched acyclic nucleoside phosphonates (ANPs) having a hemiaminal ether moiety was synthesized as potential inhibitors of bacterial adenylate cyclases. ANPs prepared as bisamidates were not cytotoxic but did not exhibited any profound activity (IC50 > 10 µM) towards ACT in J774A...
December 13, 2017: ChemMedChem
https://www.readbyqxmd.com/read/29235255/immune-response-profiling-of-primary-monocytes-and-oral-keratinocytes-to-different-tannerella-forsythia-strains-and-their-cell-surface-mutants
#5
Susanne Bloch, Stephanie Zwicker, Nagihan Bostanci, Åsa Sjöling, Elisabeth A Boström, Georgios N Belibasakis, Christina Schäffer
The oral pathogen Tannerella forsythia possesses a unique surface (S-) layer with a complex O-glycan containing a bacterial sialic acid mimic in the form of either pseudaminic acid or legionaminic acid at its terminal position. We hypothesize that different T. forsythia strains employ these stereoisomeric sugar acids for interacting with the immune system and resident host tissues in the periodontium. Here, we show how T. forsythia strains ATCC 43037 and UB4, displaying pseudaminic acid and legionaminic acid, respectively, and selected cell surface mutants of these strains, modulate the immune response in monocytes and human oral keratinocytes (HOK) using a multiplex immunoassay...
December 12, 2017: Molecular Oral Microbiology
https://www.readbyqxmd.com/read/29235175/acetate-provokes-mitochondrial-stress-and-cell-death-in-ustilago-maydis
#6
Matthias Kretschmer, Scott Lambie, Daniel Croll, James W Kronstad
The fungal pathogen Ustilago maydis causes disease on maize by mating to establish an infectious filamentous cell type that invades the host and induces tumours. We previously found that β-oxidation mutants were defective in virulence and did not grow on acetate. Here we demonstrate that acetate inhibits filamentation during mating and in response to oleic acid. We therefore examined the influence of different carbon sources by comparing the transcriptomes of cells grown on acetate, oleic acid or glucose, with expression changes for the fungus during tumour formation in planta...
December 13, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/29234885/the-influence-of-related-and-unrelated-co-infections-on-parasite-dynamics-and-virulence
#7
A M Gleichsner, K Reinhart, D J Minchella
Many parasitic infections increase the morbidity and mortality of host populations. Interactions between co-infecting parasites can influence virulence, the damage done to a host. Previous studies investigating the impacts of parasite co-infection on hosts have been limited by their inability to control parasite dosage, use consistent virulence metrics, or verify co-infection status. This study used molecular tools, known infection dosage, and multiple assessments over time to test whether parasite relatedness can predict virulence in co-infections, as well as whether competitive interactions between different parasite strains within a host are predictable over time...
December 12, 2017: Oecologia
https://www.readbyqxmd.com/read/29234606/complete-genome-sequence-of-n2-fixing-model-strain-klebsiella-sp-nov-m5al-which-produces-plant-cell-wall-degrading-enzymes-and-siderophores
#8
Zhili Yu, Shuying Li, Yuanyuan Li, Zhuang Jiang, Jinru Zhou, Qianli An
The bacterial strain M5al is a model strain for studying the molecular genetics of N2-fixation and molecular engineering of microbial production of platform chemicals 1,3-propanediol and 2,3-butanediol. Here, we present the complete genome sequence of the strain M5al, which belongs to a novel species closely related to Klebsiella michiganensis. M5al secretes plant cell wall-degrading enzymes and colonizes rice roots but does not cause soft rot disease. M5al also produces siderophores and contains the gene clusters for synthesis and transport of yersiniabactin which is a critical virulence factor for Klebsiella pathogens in causing human disease...
March 2018: Biotechnology Reports
https://www.readbyqxmd.com/read/29234496/persistent-diarrhoea-in-a-5-month-old-baby-carrying-vibrio-cholerae-nono1-nono139-producing-haitian-cholera-toxin
#9
P Kumar, S Karmakar, R Prasad, R Chopra, S Khandelwal, S Gupta, A C Dhariwal, P Yadav, P K Yadava
Cholera toxin (CT) is the principal virulence factor of Vibrio cholerae for fatal cholera diarrhoea. Serogroups O1 and O139 harbour CT and are known to be epidemic strains. The remaining serogroups (nonO1/nonO139) are non-toxigenic and may be associated with mild disease. O1 serogroup emerged with a variant of CT known as Haitian cholera toxin (HCT). The HCT strains are hypervirulent and have been associated with severe cholera outbreaks in India, Western Africa and Haiti. Here, we report the presence of HCT (ctxB7) in a nonO1/nonO139 isolate causing persistent diarrhoea...
January 2018: New Microbes and New Infections
https://www.readbyqxmd.com/read/29234317/panton-valentine-leucocidin-pvl-as-a-potential-indicator-for-prevalence-duration-and-severity-of-staphylococcus-aureus-osteomyelitis
#10
Bei Jiang, Yinan Wang, Zihan Feng, Lei Xu, Li Tan, Shuang Zhao, Yali Gong, Cheng Zhang, Xiaoqiang Luo, Shu Li, Xiancai Rao, Yizhi Peng, Zhao Xie, Xiaomei Hu
Staphylococcus aureus is the most common cause of the difficult-to-treat osteomyelitis (OM). To better diagnose and manage S. aureus OM, especially for severe and long duration cases, indicators for risk prediction and severity evaluation are needed. Here, 139 clinical S. aureus isolates from orthopedic infections were divided into OM group (60 isolates from 60 OM patients) and non-OM group (79 isolates from 79 non-OM patients). Molecular types, antimicrobial susceptibility, and virulence factor profiles were evaluated and compared between the two groups to identify potential indicators associated with the prevalence of S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29234307/thymoquinone-inhibits-virulence-related-traits-of-cronobacter-sakazakii-atcc-29544-and-has-anti-biofilm-formation-potential
#11
Chao Shi, Chunhong Yan, Yue Sui, Yi Sun, Du Guo, Yifei Chen, Tong Jin, Xiaoli Peng, Linlin Ma, Xiaodong Xia
The aim of this study was to determine whether thymoquinone, the principal active ingredient in the volatile oil of Nigella sativa seeds, could suppress certain virulence traits of Cronobacter sakazakii ATCC 29544 which contribute to infection. Sub-inhibitory concentrations of thymoquinone significantly decreased motility, quorum sensing, and endotoxin production of C. sakazakii ATCC 29544 and biofilm formation of C. sakazakii 7-17. Thymoquinone substantially reduced the adhesion and invasion of C. sakazakii ATCC 29544 to HT-29 cells and decreased the number of intracellular bacterial cells within the RAW 264...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29234127/recent-spread-of-varroa-destructor-virus-1-a-honey-bee-pathogen-in-the-united-states
#12
Eugene V Ryabov, Anna K Childers, Yanping Chen, Shayne Madella, Ashrafun Nessa, Dennis vanEngelsdorp, Jay D Evans
RNA viruses impact honey bee health and contribute to elevated colony loss rates worldwide. Deformed wing virus (DWV) and the closely related Varroa destructor virus-1 (VDV1), are the most widespread honey bee viruses. VDV1 is known to cause high rates of overwintering colony losses in Europe, however it was unknown in the United States (US). Using next generation sequencing, we identified VDV1 in honey bee pupae in the US. We tested 603 apiaries the US in 2016 and found that VDV1 was present in 66.0% of them, making it the second most prevalent virus after DWV, which was present in 89...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29234115/the-glutamic-residue-at-position-402-in-the-c-terminus-of-newcastle-disease-virus-nucleoprotein-is-critical-for-the-virus
#13
Xiaohui Yu, Jinlong Cheng, Zirong He, Chuang Li, Yang Song, Jia Xue, Huiming Yang, Rui Zhang, Guozhong Zhang
The nucleocapsid proteins (NPs) of Newcastle disease virus (NDV) and other paramyxoviruses play an important functional role during genomic RNA replication. Our previous study showed that the NP-encoding gene significantly influenced viral replication. Here, we investigated the roles of certain amino acid residues in the NP C-terminus in viral replication and virulence. Results showed that the glutamic acid residue at position 402 (E402) in the C-terminus of the NP is critical for RNA synthesis in the NDV mini-genome system...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29234082/rebound-of-cotton-leaf-curl-multan-virus-and-its-exclusive-detection-in-cotton-leaf-curl-disease-outbreak-punjab-india-2015
#14
Sibnarayan Datta, Raghvendra Budhauliya, Bidisha Das, Reji Gopalakrishnan, Sonika Sharma, Soumya Chatterjee, Vanlalhmuaka, P Srinivas Raju, Vijay Veer
Cotton leaf curl disease (CLCuD) outbreaks caused by CLCuD associated begomoviruses (CABs) significantly constrain cotton production in India and Pakistan. In comparison to the CABs circulating in Pakistan, molecular epidemiology, evolution and recombination patterns of CABs circulating in India are less studied. In this work, we characterized CAB complex sequences obtained from the most recent outbreak (Punjab, India, 2015), and rigorously analyzed them with reference to GenBank sequences, submitted from India, Pakistan and other neighbouring countries, using contemporary bioinformatics approaches...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29234007/insights-into-the-structure-and-assembly-of-a-bacterial-cellulose-secretion-system
#15
Petya Violinova Krasteva, Joaquin Bernal-Bayard, Laetitia Travier, Fernando Ariel Martin, Pierre-Alexandre Kaminski, Gouzel Karimova, Rémi Fronzes, Jean-Marc Ghigo
Secreted exopolysaccharides present important determinants for bacterial biofilm formation, survival, and virulence. Cellulose secretion typically requires the concerted action of a c-di-GMP-responsive inner membrane synthase (BcsA), an accessory membrane-anchored protein (BcsB), and several additional Bcs components. Although the BcsAB catalytic duo has been studied in great detail, its interplay with co-expressed subunits remains enigmatic. Here we show that E. coli Bcs proteins partake in a complex protein interaction network...
December 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29233990/balancing-mcr-1-expression-and-bacterial-survival-is-a-delicate-equilibrium-between-essential-cellular-defence-mechanisms
#16
Qiue Yang, Mei Li, Owen B Spiller, Diego O Andrey, Philip Hinchliffe, Hui Li, Craig MacLean, Pannika Niumsup, Lydia Powell, Manon Pritchard, Andrei Papkou, Yingbo Shen, Edward Portal, Kirsty Sands, James Spencer, Uttapoln Tansawai, David Thomas, Shaolin Wang, Yang Wang, Jianzhong Shen, Timothy Walsh
MCR-1 is a lipid A modifying enzyme that confers resistance to the antibiotic colistin. Here, we analyse the impact of MCR-1 expression on E. coli morphology, fitness, competitiveness, immune stimulation and virulence. Increased expression of mcr-1 results in decreased growth rate, cell viability, competitive ability and significant degradation in cell membrane and cytoplasmic structures, compared to expression of catalytically inactive MCR-1 (E246A) or MCR-1 soluble component. Lipopolysaccharide (LPS) extracted from mcr-1 strains induces lower production of IL-6 and TNF, when compared to control LPS...
December 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29233962/lipoteichoic-acid-deficiency-permits-normal-growth-but-impairs-virulence-of-streptococcus-pneumoniae
#17
Nathalie Heß, Franziska Waldow, Thomas P Kohler, Manfred Rohde, Bernd Kreikemeyer, Alejandro Gómez-Mejia, Torsten Hain, Dominik Schwudke, Waldemar Vollmer, Sven Hammerschmidt, Nicolas Gisch
Teichoic acid (TA), a crucial cell wall constituent of the pathobiont Streptococcus pneumoniae, is bound to peptidoglycan (wall teichoic acid, WTA) or to membrane glycolipids (lipoteichoic acid, LTA). Both TA polymers share a common precursor synthesis pathway, but differ in the final transfer of the TA chain to either peptidoglycan or a glycolipid. Here, we show that LTA exhibits a different linkage conformation compared to WTA, and identify TacL (previously known as RafX) as a putative lipoteichoic acid ligase required for LTA assembly...
December 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29233914/had1-is-required-for-cell-wall-integrity-and-fungal-virulence-in-cryptococcus-neoformans
#18
Won-Hee Jung, Ye-Eun Son, Sang-Hun Oh, Ci Fu, Hye Shin Kim, Jin-Hwan Kwak, Maria E Cardenas, Joseph Heitman, Hee-Soo Park
Calcineurin modulates environmental stress survival and virulence of the human fungal pathogen Cryptococcus neoformans Previously, we identified 44 putative calcineurin substrates and proposed that the calcineurin pathway is branched to regulate targets including Crz1, Pbp1, and Puf4 in C. neoformans In this study we characterized Had1, which is one of the putative calcineurin substrates and belongs to a ubiquitously conserved haloacid dehalogenase β-phosphoglucomutase protein super-family. Growth of the had1∆ mutant was found to be compromised at 38°C or higher...
December 12, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29233913/reference-quality-genome-assemblies-of-three-parastagonospora-nodorum%C3%A2-isolates-differing-in-virulence-on-wheat
#19
Jonathan K Richards, Nathan A Wyatt, Zhaohui Liu, Justin D Faris, Timothy L Friesen
Parastagonospora nodorum, the causal agent of Septoria nodorum blotch of wheat, has emerged as a model necrotrophic fungal organism for the study of host-microbe interactions. To date, three necrotrophic effectors have been identified and characterized from this pathogen, including SnToxA, SnTox1, and SnTox3. Necrotrophic effector identification was greatly aided by the development of a draft genome of Australian isolate SN15 via Sanger sequencing, yet remained largely fragmented. This research presents the development of near-finished genomes of P...
December 12, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29233912/dynamic-secretome-of-trichomonas-vaginalis-case-study-of-%C3%AE-amylases
#20
Jitka Štáfková, Petr Rada, Dionigia Meloni, Vojtěch Žárský, Tamara Smutná, Nadine Zimmann, Karel Harant, Petr Pompach, Ivan Hrdý, Jan Tachezy
The secretion of virulence factors by parasitic protists into the host environment plays a fundamental role in multifactorial host-parasite interactions. Several effector proteins are known to be secreted by Trichomonas vaginalis, a human parasite of the urogenital tract. However, a comprehensive profiling of the T. vaginalis secretome remains elusive, as do the mechanisms of protein secretion. In this study, we used high-resolution label-free quantitative MS to analyze the T. vaginalis secretome, considering that secretion is a time- and temperature-dependent process, to define the cutoff for secreted proteins...
December 12, 2017: Molecular & Cellular Proteomics: MCP
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