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https://www.readbyqxmd.com/read/29149637/antiviral-potential-of-natural-compounds-against-influenza-virus-hemagglutinin
#1
S Kannan, P Kolandaivel
Influenza virus of different subtypes H1N1, H2N2, H3N2 and H5N1 cause many human pandemic deaths and threatening the people worldwide. The Hemagglutinin (HA) protein mediates viral attachment to host receptors act as an attractive target. The sixteen natural compounds have been chosen to target the HA protein. Molecular docking studies have been performed to find binding affinity of the compounds. Out of the sixteen, three compounds CI, CII and CIII found to posses a higher binding affinity. The molecular dynamics (MD) simulation has been performed to study the structural, dynamical properties for the nine different complexes CI, CII, CIII bound with H1, H2, H3 proteins and the results were compared...
November 4, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/29148270/a-g3p-13-porcine-group-a-rotavirus-emerging-in-china-is-a-reassortant-and-a-natural-recombinant-in-the-vp4-gene
#2
Z Jing, X Zhang, H Shi, J Chen, D Shi, H Dong, L Feng
Group A rotaviruses (RVAs) are a major cause of serious intestinal disease in piglets. In this study, a novel pig strain was identified in a stool sample from China. The strain was designated RVA/Pig/China/LNCY/2016/G3P[13] and had a G3-P[13]-I5-R1-C1-M1-A8-N1-T1-E1-H1 genome. The viral protein 7 (VP7) and non-structural protein 4 (NSP4) genes of RVA/Pig/China/LNCY/2016/G3P[13] were closely related to cogent genes of human RVAs, suggesting that a reassortment between pig and human strains had occurred. Recombination analysis showed that RVA/Pig/China/LNCY/2016/G3P[13] is a natural recombinant strain between the P[23] and P[7] RVA strains, and crossover points for recombination were found at nucleotides (nt) 456 and 804 of the VP4 gene...
November 16, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/29146922/molecular-definition-of-multiple-sites-of-antibody-inhibition-of-malaria-transmission-blocking-vaccine-antigen-pfs25
#3
Stephen W Scally, Brandon McLeod, Alexandre Bosch, Kazutoyo Miura, Qi Liang, Sean Carroll, Sini Reponen, Ngan Nguyen, Eldar Giladi, Sebastian Rämisch, Vidadi Yusibov, Allan Bradley, Franck Lemiale, William R Schief, Daniel Emerling, Paul Kellam, C Richter King, Jean-Philippe Julien
The Plasmodium falciparum Pfs25 protein (Pfs25) is a leading malaria transmission-blocking vaccine antigen. Pfs25 vaccination is intended to elicit antibodies that inhibit parasite development when ingested by Anopheles mosquitoes during blood meals. The Pfs25 three-dimensional structure has remained elusive, hampering a molecular understanding of its function and limiting immunogen design. We report six crystal structures of Pfs25 in complex with antibodies elicited by immunization via Pfs25 virus-like particles in human immunoglobulin loci transgenic mice...
November 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29145521/characterization-of-rubella-specific-humoral-immunity-following-two-doses-of-mmr-vaccine-using-proteome-microarray-technology
#4
Iana H Haralambieva, Michael J Gibson, Richard B Kennedy, Inna G Ovsyannikova, Nathaniel D Warner, Diane E Grill, Gregory A Poland
INTRODUCTION//BACKGROUND: The lack of standardization of the currently used commercial anti-rubella IgG antibody assays leads to frequent misinterpretation of results for samples with low/equivocal antibody concentration. The use of alternative approaches in rubella serology could add new information leading to a fuller understanding of rubella protective immunity and neutralizing antibody response after vaccination. METHODS: We applied microarray technology to measure antibodies to all rubella virus proteins in 75 high and 75 low rubella virus-specific antibody responders after two MMR vaccine doses...
2017: PloS One
https://www.readbyqxmd.com/read/29144446/structure-and-assembly-of-the-ebola-virus-nucleocapsid
#5
William Wan, Larissa Kolesnikova, Mairi Clarke, Alexander Koehler, Takeshi Noda, Stephan Becker, John A G Briggs
Ebola and Marburg viruses are filoviruses: filamentous, enveloped viruses that cause haemorrhagic fever. Filoviruses are within the order Mononegavirales, which also includes rabies virus, measles virus, and respiratory syncytial virus. Mononegaviruses have non-segmented, single-stranded negative-sense RNA genomes that are encapsidated by nucleoprotein and other viral proteins to form a helical nucleocapsid. The nucleocapsid acts as a scaffold for virus assembly and as a template for genome transcription and replication...
November 16, 2017: Nature
https://www.readbyqxmd.com/read/29144204/specific-hypersensitive-response-associated-recognition-of-new-apoplastic-effectors-from-cladosporium-fulvum-in-wild-tomato
#6
Carl H Mesarich, Bilal Ӧkmen, Hanna Rovenich, Scott A Griffiths, Changchun Wang, Mansoor Karimi Jashni, Aleksandar Mihajlovski, Jérôme Collemare, Lukas Hunziker, Cecilia H Deng, Ate van der Burgt, Henriek G Beenen, Matthew D Templeton, Rosie E Bradshaw, Pierre J G M de Wit
Tomato leaf mold disease is caused by the biotrophic fungus Cladosporium fulvum. During infection, C. fulvum produces extracellular small secreted protein (SSP) effectors that function to promote colonization of the leaf apoplast. Resistance to the disease is governed by Cf immune receptor genes that encode receptor-like proteins (RLPs). These RLPs recognize specific SSP effectors to initiate a hypersensitive response (HR) that renders the pathogen avirulent. C. fulvum strains capable of overcoming one or more of all cloned Cf genes have now emerged...
November 16, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29144203/suppression-or-activation-of-immune-responses-by-predicted-secreted-proteins-of-the-soybean-rust-pathogen-phakopsora-pachyrhizi
#7
Mingsheng Qi, James P Grayczyk, Janina M Seitz, Youngsill Lee, Tobias I Link, Doil Choi, Kerry F Pedley, Ralf T Voegele, Thomas J Baum, Steven A Whitham
Rust fungi, such as the soybean rust pathogen Phakopsora pachyrhizi, are major threats to crop production. They form specialized haustoria that are hyphal structures intimately associated with host-plant cell membranes. These haustoria have roles in acquiring nutrients and secreting effector proteins that manipulate host immune systems. Functional characterization of effector proteins of rust fungi is important for understanding mechanisms that underlie their virulence and pathogenicity. Hundreds of candidate effector proteins have been predicted for rust pathogens, but it is not clear how to prioritize these effector candidates for further characterization...
November 16, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29143142/prevalence-of-ns5b-resistance-associated-variants-in-treatment-na%C3%A3-ve-asian-patients-with-chronic-hepatitis-c
#8
Song Yang, Huichun Xing, Shenghu Feng, Wei Ju, Shunai Liu, Xiaomei Wang, Weini Ou, Jun Cheng, Calvin Q Pan
There is little information on the association between baseline non-structural protein (NS) 5b resistance-associated variants (RAVs) and treatment failure in hepatitis C patients. This study examined the frequencies of natural hepatitis C virus (HCV) NS5B resistance-associated variants (RAVs) in an Asian cohort. Samples from Asian HCV patients enrolled between October 2009 and September 2014 were analyzed for NS5B RAVs within the region from amino acid 230 to 371. Serum samples were tested by PCR genotyping, with sequence alignment performed using the neighbor-joining method...
November 15, 2017: Archives of Virology
https://www.readbyqxmd.com/read/29142137/the-epstein-barr-virus-episome-maneuvers-between-nuclear-chromatin-compartments-during-reactivation
#9
Stephanie A Moquin, Sean Thomas, Sean Whalen, Alix Warburton, Samantha G Fernandez, Alison A McBride, Katherine S Pollard, J J L Miranda
The human genome is structurally organized in three-dimensional space to facilitate functional partitioning of transcription. We learned that the latent episome of the human Epstein-Barr virus (EBV) preferentially associates with gene-poor chromosomes and avoids gene-rich chromosomes. Kaposi's sarcoma-associated herpesvirus behaves similarly, but human papillomavirus does not. Contacts localize on the EBV side to OriP, the latent origin of replication. This genetic element, and the EBNA1 protein that binds there, are sufficient to reconstitute chromosome association preferences of the entire episome...
November 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29142132/identification-of-a-small-molecule-that-compromises-the-structural-integrity-of-viroplasms-and-rotavirus-double-layered-particles
#10
Catherine Eichwald, Giuditta De Lorenzo, Elisabeth M Schraner, Guido Papa, Michela Bollati, Paolo Swuec, Matteo de Rosa, Mario Milani, Eloise Mastrangelo, Mathias Ackermann, Oscar R Burrone, Francesca Arnoldi
Despite the availability of two attenuated vaccines, rotavirus (RV) gastroenteritis remains an important cause of mortality among children in developing countries causing about 215,000 infant deaths annually. Currently, there are no specific antiviral therapies available. RV is a non-enveloped virus with a segmented double-stranded RNA genome. Viral genome replication and assembly of transcriptionally active double-layered particles (DLPs) take place in cytoplasmic viral structures called viroplasms. In this study, we describe strong impairment of the early stages of RV replication induced by a small molecule known as RNA polymerase III inhibitor, ML-60218 (ML)...
November 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29142128/interaction-between-a-unique-minor-protein-and-a-major-capsid-protein-of-bluetongue-virus-controls-virus-infectivity
#11
Eiko Matsuo, Kiyoshi Yamazaki, Hiroki Tsuruta, Polly Roy
Among the Reoviridae family of double-stranded RNA viruses, only members of the Orbivirus genus possess a unique structural protein, termed VP6, within their particles. Bluetongue virus (BTV), an important livestock pathogen, is the prototype Orbivirus The BTV VP6 is an ATP-dependent RNA helicase and it is indispensable for virus replication. In this report, we investigated how VP6 might be recruited to the virus capsid and whether the BTV structural protein VP3, which forms the internal layer of the virus capsid core, is involved in VP6 recruitment...
November 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29142127/epstein-barr-virus-protein-eb2-stimulates-translation-initiation-of-mrnas-through-direct-interactions-with-both-pabp-and-eif4g
#12
Fabrice Mure, Baptiste Panthu, Isabelle Zanella-Cléon, Frédéric Delolme, Evelyne Manet, Théophile Ohlmann, Henri Gruffat
Epstein-Barr virus (EBV) expresses several mRNAs produced from intronless genes that could potentially be unfavorably translated compared to cellular spliced mRNAs. To overcome this situation, the virus encodes an RNA-binding protein (RBP) called EB2, previously found to both facilitate the export of nuclear mRNAs and increase their translational yield. Here, we show that EB2 binds both nuclear and cytoplasmic cap-binding complexes (respectively, CBC and eIF4F) as well as the poly(A)-binding protein (PABP) to enhance translation initiation of a given mRNP...
November 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29142124/truncating-the-gp41-cytoplasmic-tail-of-siv-decreases-sensitivity-to-neutralizing-antibodies-without-increasing-envelope-content-of-virions
#13
Ellen White, Fan Wu, Elena Chertova, Julian Bess, James D Roser, Jeffrey D Lifson, Vanessa M Hirsch
An incomplete understanding of native HIV and SIV envelope glycoprotein (Env) impedes the development of structural models of Env and vaccine design. This shortcoming is due in part to the low number of Env trimers on virus particles. For SIV, this low expression can be counteracted by truncating the cytoplasmic tail (CT) of Env. CT truncation has been shown to increase Env incorporation into the virion and is commonly used in vaccine and imaging studies, but its effects on viral antigenicity have not been fully elucidated...
November 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29142123/initiation-elongation-and-realignment-during-influenza-virus-mrna-synthesis
#14
Aartjan J W Te Velthuis, Judith Oymans
The RNA-dependent RNA polymerase (RdRp) of the influenza A virus replicates and transcribes the viral genome segments in the nucleus of the host cell. To transcribe these viral genome segments, the RdRp 'snatches' capped RNA oligonucleotides from nascent host cell mRNAs and aligns these primers to the ultimate or penultimate nucleotide of the segments for the initiation of viral mRNA synthesis. It has been proposed that this initiation process is not processive and that the RdRp uses a prime-realign mechanism during transcription...
November 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29140480/the-intrinsically-disordered-n-terminal-arm-of-the-brome-mosaic-virus-coat-protein-specifically-recognizes-the-rna-motif-that-directs-the-initiation-of-viral-rna-replication
#15
Alexander Jacobs, Haley Hoover, Edward Smith, David E Clemmer, Chul-Hyun Kim, C Cheng Kao
In the brome mosaic virus (BMV) virion, the coat protein (CP) selectively contacts the RNA motifs that regulate translation and RNA replication (Hoover et al., 2016. J. Virol. 90, 7748). We hypothesize that the unstructured N-terminal arm (NTA) of the BMV CP can specifically recognize RNA motifs. Using ion mobility spectrometry-mass spectrometry, we demonstrate that peptides containing the NTA of the CP were found to preferentially bind to an RNA hairpin motif that directs the initiation of BMV RNA synthesis...
November 11, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29139348/regulation-of-hepatitis-c-virus-replication-via-threonine-phosphorylation-of-the-ns5a-protein
#16
Niluka Goonawardane, Douglas Ross-Thriepland, Mark Harris
The hepatitis C virus non-structural 5A (NS5A) protein is highly phosphorylated and plays roles in both virus genome replication and assembly of infectious virus particles. NS5A comprises three domains separated by low complexity sequences (LCS). Mass spectrometry analysis of NS5A revealed the existence of a singly phosphorylated tryptic peptide corresponding to the end of LCS I and the beginning of domain II that contained a number of potential phosphorylatable residues (serines and threonines). Here we use a mutagenic approach to investigate the potential role of three of these threonine residues...
November 15, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/29137867/functionalized-2-1-benzothiazine-2-2-dioxides-as-new-inhibitors-of-dengue-ns5-rna-dependent-rna-polymerase
#17
Rolando Cannalire, Delia Tarantino, Andrea Astolfi, Maria Letizia Barreca, Stefano Sabatini, Serena Massari, Oriana Tabarrini, Mario Milani, Gilles Querat, Eloise Mastrangelo, Giuseppe Manfroni, Violetta Cecchetti
Over recent years, many RNA viruses have been "re-discovered", including life-threatening flaviviruses, such as Dengue, Zika, and several encephalitis viruses. Since no specific inhibitors are currently available to treat these infections, there is a pressing need for new therapeutics. Among the flaviviral proteins, NS5 RNA-dependent RNA polymerase (RdRp) represents a validated target being essential for viral replication and it has no human analog. To date, few NS5 RdRp inhibitor chemotypes have been reported and no inhibitors are currently in clinical development...
November 11, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29137642/effects-of-mrna-secondary-structure-on-the-expression-of-hev-orf2-proteins-in-escherichia-coli
#18
Nouredine Behloul, Wenjuan Wei, Sarra Baha, Zhenzhen Liu, Jiyue Wen, Jihong Meng
BACKGROUND: Viral protein expression in Escherichia coli (E. coli) is a powerful tool for structural/functional studies as well as for vaccine and diagnostics development. However, numerous factors such as codon bias, mRNA secondary structure and nucleotides distribution, have been indentified to hamper this heterologous expression. RESULTS: In this study, we combined computational and biochemical methods to analyze the influence of these factors on the expression of different segments of hepatitis E virus (HEV) ORF 2 protein and hepatitis B virus surface antigen (HBsAg)...
November 14, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/29137162/structures-and-functions-of-the-envelope-glycoprotein-in-flavivirus-infections
#19
REVIEW
Xingcui Zhang, Renyong Jia, Haoyue Shen, Mingshu Wang, Zhongqiong Yin, Anchun Cheng
Flaviviruses are enveloped, single-stranded RNA viruses that widely infect many animal species. The envelope protein, a structural protein of flavivirus, plays an important role in host cell viral infections. It is composed of three separate structural envelope domains I, II, and III (EDI, EDII, and EDIII). EDI is a structurally central domain of the envelope protein which stabilizes the overall orientation of the protein, and the glycosylation sites in EDI are related to virus production, pH sensitivity, and neuroinvasiveness...
November 13, 2017: Viruses
https://www.readbyqxmd.com/read/29136651/structural-basis-of-glycan-specificity-of-p-19-vp8-implications-for-rotavirus-zoonosis-and-evolution
#20
Yang Liu, Shenyuan Xu, Andrew L Woodruff, Ming Xia, Ming Tan, Michael A Kennedy, Xi Jiang
Recognition of specific cell surface glycans, mediated by the VP8* domain of the spike protein VP4, is the essential first step in rotavirus (RV) infection. Due to lack of direct structural information of virus-ligand interactions, the molecular basis of ligand-controlled host ranges of the major human RVs (P[8] and P[4]) in P[II] genogroup remains unknown. Here, through characterization of a minor P[II] RV (P[19]) that can infect both animals (pigs) and humans, we made an important advance to fill this knowledge gap by solving the crystal structures of the P[19] VP8* in complex with its ligands...
November 14, 2017: PLoS Pathogens
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