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Journal of Virology

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https://www.readbyqxmd.com/read/29769351/protein-phosphatase-1%C3%AE-interacts-with-venezuelan-equine-encephalitis-virus-capsid-protein-and-regulates-viral-replication-through-modulation-of-capsid-phosphorylation
#1
Brian D Carey, Tatiana Ammosova, Chelsea Pinkham, Xionghao Lin, Weidong Zhou, Lance A Liotta, Sergei Nekhai, Kylene Kehn-Hall
Protein Phosphatase 1 (PP1) is a serine/threonine phosphatase which has been implicated in the regulation of a number of viruses including HIV-1, Ebolavirus and Rift Valley fever virus. Catalytic subunits of PP1 (PP1α, PP1β, or PP1γ) interact with a host of regulatory subunits and target a wide variety of cellular substrates through a combination of short binding motifs, including an RVxF motif present in the majority of PP1 regulatory subunits. Targeting the RVxF interacting site on PP1 with the small molecule, 1E7-03 inhibits HIV-1, Ebolavirus, and Rift Valley fever virus replication...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769350/rab5-rab7-and-rab11-are-required-for-caveolae-dependent-endocytosis-of-classic-swine-fever-virus-in-porcine-alveolar-macrophages
#2
Yun-Na Zhang, Ya-Yun Liu, Fu-Chuan Xiao, Chun-Chun Liu, Xiao-Dong Liang, Jing Chen, Jing Zhou, Abdul Sattar Baloch, Lin Kan, Bin Zhou, Hua-Ji Qiu
The members of Flaviviridae utilize several endocytic pathways to enter a variety of host cells. Our previous work showed that classical swine fever virus (CSFV) enters porcine kidney (PK-15) cells through a clathrin-dependent pathway that requires Rab5 and Rab7. The entry mechanism for CSFV into other cell lines remains unclear, for instance, porcine alveolar macrophages (3D4/21 cells). More importantly, the trafficking of CSFV within endosomes controlled by Rab GTPases is unknown in 3D4/21 cells. In this study, entry and post-internalization of CSFV were analyzed using chemical inhibitors, RNA interference, and dominant negative (DN) mutants...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769349/hiv-1-activation-of-innate-immunity-depends-strongly-on-the-intracellular-level-of-trex1-and-sensing-of-incomplete-reverse-transcription-products
#3
Swati Kumar, James H Morrison, David Dingli, Eric Poeschla
TREX1 has been reported to degrade cytosolic immune-stimulatory DNA, including viral DNA generated during HIV-1 infection, but the dynamic range of its capacity to suppress innate immune stimulation is unknown and its full role in the viral life cycle remains unclear. A main purpose of our study was to determine how the intracellular level of TREX1 affects HIV-1 activation and avoidance of innate immunity. Using stable over-expression and CRISPR-mediated gene disruption, we engineered a range of TREX1 levels in human THP-1 monocytes...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769348/discovery-and-sequence-analysis-of-four-deltacoronaviruses-from-birds-in-the-middle-east-suggest-interspecies-jumping-and-recombination-as-potential-mechanism-for-avian-to-avian-and-avian-to-mammalian-transmission
#4
Susanna K P Lau, Emily Y M Wong, Chi-Ching Tsang, Syed Shakeel Ahmed, Rex K H Au-Yeung, Kwok-Yung Yuen, Ulrich Wernery, Patrick C Y Woo
The emergence of Middle East respiratory syndrome showed once again that coronaviruses (CoVs) in animals are potential source for epidemics in humans. To explore the diversity of deltacoronaviruses in animals in the Middle East, we tested fecal samples from 1,356 mammals and birds in Dubai. Four novel deltacoronaviruses were detected from eight birds of four species by RT-PCR: FalCoV UAE-HKU27 from a falcon, HouCoV UAE-HKU28 from a houbara bustard, PiCoV UAE-HKU29 from a pigeon and QuaCoV UAE-HKU30 from five quails...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769347/avian-influenza-viruses-in-wild-birds-virus-evolution-in-a-multi-host-ecosystem
#5
Divya Venkatesh, Marjolein J Poen, Theo M Bestebroer, Rachel D Scheuer, Oanh Vuong, Mzia Chkhaidze, Anna Machablishvili, Jimsher Mamuchadze, Levan Ninua, Nadia B Fedorova, Rebecca A Halpin, Xudong Lin, Amy Ransier, Timothy B Stockwell, David E Wentworth, Divya Kriti, Jayeeta Dutta, Harm van Bakel, Anita Puranik, Marek J Slomka, Steve Essen, Ian H Brown, Ron A M Fouchier, Nicola S Lewis
Wild ducks and gulls are the major reservoirs for avian influenza A viruses (AIVs). The mechanisms that drive AIV evolution are complex at sites where various duck and gull species from multiple flyways breed, winter or stage. The Republic of Georgia is located at the intersection of three migratory flyways: Central Asian Flyway, East Asian/East African Flyway and Black Sea/Mediterranean Flyway. For six consecutive years (2010-2016), we collected AIV samples from various duck and gull species that breed, migrate and overwinter in Georgia...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769346/porcine-deltacoronavirus-accessory-protein-ns6-antagonizes-ifn-%C3%AE-production-by-interfering-with-the-binding-of-rig-i-mda5-to-double-stranded-rna
#6
Puxian Fang, Liurong Fang, Jie Ren, Yingying Hong, Xiaorong Liu, Yunyang Zhao, Dang Wang, Guiqing Peng, Shaobo Xiao
Porcine deltacoronavirus (PDCoV) has recently emerged as an enteric pathogen that can cause serious vomiting and diarrhea in suckling piglets. The first outbreak of PDCoV occurred in the United States in 2014 and was followed by reports of PDCoV in South Korea, China, Thailand, Lao people's Democratic Republic, and Vietnam, leading to economic losses for pig farms and posing considerable threat to the swine industry worldwide. Our previous studies have shown that PDCoV encodes three accessory proteins, NS6, NS7, and NS7a, but the functions of these proteins in viral replication, pathogenesis, and immune regulation remain unclear...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769345/the-major-tegument-protein-of-bovine-herpesvirus-1-vp8-interacts-with-dna-damage-response-proteins-and-induces-apoptosis
#7
Sharmin Afroz, Ravendra Garg, Michel Fodje, Sylvia van Drunen Littel-van den Hurk
VP8, the UL47 gene product in bovine herpes virus-1 (BoHV-1), is a major tegument protein, essential for virus replication in vivo The major DNA damage response protein, ataxia telangiectasia mutated (ATM), phosphorylates Nijmegen breakage syndrome (NBS1) and structural maintenance of chromosome-1 (SMC1) proteins during the DNA damage response. VP8 was found to interact with ATM and NBS1 during transfection and BoHV-1 infection. However, VP8 did not interfere with phosphorylation of ATM in transfected or BoHV-1-infected cells...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769344/efficient-delivery-of-hcmv-t-cell-antigens-by-attenuated-sendai-virus-vectors
#8
Richard Kiener, Markus Fleischmann, Marian Alexander Wiegand, Niels A W Lemmermann, Christiane Schwegler, Christine Kaufmann, Angelique Renzaho, Simone Thomas, Eva Felder, Hans Helmut Niller, Benedikt Asbach, Ralf Wagner
Human Cytomegalovirus (HCMV) represents a major cause of clinical complications during pregnancy as well as immunosuppression and the licensing of a protective HCMV vaccine remains an unmet global need. Herein, we designed and validated novel Sendai virus (SeV) vectors delivering T cell immunogens IE-1 and pp65. To enhance vector safety, we used a replication-deficient strain (rdSeV) that infects target cells in a non-productive manner while retaining viral gene expression. In this study, we explored the impact that transduction with rdSeV has on human dendritic cells (DCs) by comparing it to the parental, replication-competent Sendai virus strain (rcSeV) as well as the poxvirus strain Modified Vaccinia Ankara (MVA)...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769343/glycoprotein-3-of-porcine-reproductive-and-respiratory-syndrome-virus-exhibits-an-unusual-hairpin-like-membrane-topology
#9
Minze Zhang, Ludwig Krabben, Fangkun Wang, Michael Veit
The glycoprotein GP3 of the Arterivirus porcine reproductive and respiratory syndrome virus (PRRSV) consists of a cleaved signal peptide, a highly glycosylated domain, a short hydrophobic region and an unglycosylated C-terminal domain. GP3 is supposed to form a complex with GP2 and GP4 in virus particles, but secretion of GP3 from cells has also been reported.We analyzed the membrane topology of GP3 from various PRRSV strains. A fraction of the protein is secreted from transfected cells; GP3 from PRRSV-1 strains to a greater extent than GP3 from PRRSV-2 strains...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769342/cotesia-congregata-bracovirus-circles-encoding-ptp-and-ankyrin-genes-integrate-into-the-dna-of-parasitized-manduca-sexta-hemocytes
#10
Germain Chevignon, Georges Periquet, Gabor Gyapay, Nathalie Vega-Czarny, Karine Musset, Jean-Michel Drezen, Elisabeth Huguet
Polydnaviruses (PDVs) are essential for the parasitism success of tens of thousands of species of parasitoid wasps. PDVs are present in wasp genomes as proviruses, which serve as template for the production of double stranded circular viral DNA carrying virulence genes that are injected into lepidopteran hosts. PDV circles do not contain genes coding for particle production hence impeding viral replication in caterpillar hosts during parasitism. Here we investigated the fate of PDV circles of Cotesia congregata bracovirus during parasitism of the tobacco hornworm, Manduca sexta , by the wasp Cotesia congregata Sequences sharing similarities with Host integration Motifs (HIM) involved in integration into DNA of Microplitis demolitor bracovirus (MdBV) circles, could be identified in 12 CcBV circles, which encode PTP and VANK gene families involved in host immune disruption...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769341/mutational-analysis-of-the-bovine-hepacivirus-internal-ribosome-entry-site
#11
A L Baron, A Schoeniger, P Becher, C Baechlein
In recent years, hepatitis C virus (HCV)-related viruses were identified in several species including dogs, horses, bats and rodents. Additionally, a novel virus of the genus Hepacivirus has been discovered in bovine samples and was termed bovine hepacivirus (BovHepV). Prediction of the BovHepV IRES (internal ribosome entry site) structure revealed strong similarities to the HCV IRES structure comprising domains II, IIIabcde, pseudoknot IIIf and domain IV with the initiation codon AUG. Unlike HCV, only one microRNA-122 (miR-122) binding site could be identified in the BovHepV 5' NTR...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769340/the-htlv-1-basic-leucine-zipper-factor-hbz-attenuates-repair-of-double-stranded-dna-breaks-via-non-homologous-end-joining-nhej
#12
A W Rushing, K Hoang, N Polakowski, I Lemasson
Adult T-cell leukemia (ATL) is a fatal malignancy of CD4+ T-cells infected with human T-cell leukemia virus type I (HTLV-1). ATL cells often exhibit random gross chromosomal rearrangements that are associated with the induction and improper repair of double-stranded DNA breaks (DSBs). The viral oncoprotein Tax has been reported to impair DSB repair, but is not shown to be consistently expressed throughout all phases of infection. The viral oncoprotein HTLV-1 basic leucine zipper factor (HBZ) is consistently expressed prior to and throughout disease progression, but it is unclear whether it also influences DSB repair...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769339/differential-responses-by-human-respiratory-epithelial-cell-lines-to-respiratory-syncytial-virus-reflect-distinct-patterns-of-infection-control
#13
Philippa Hillyer, Rachel Shepard, Megan Uehling, Mina Krenz, Faruk Sheikh, Kalyn R Thayer, Lei Huang, Lihan Yan, Debasis Panda, Cindy Luongo, Ursula J Buchholz, Peter L Collins, Raymond P Donnelly, Ronald L Rabin
RSV infects small foci of respiratory epithelial cells via infected droplets. Infection induces expression of types I and III interferons (IFNs) and pro-inflammatory cytokines, the balance of which may restrict viral replication and affect disease severity. We explored this balance by infecting two respiratory epithelial cell lines with low doses of recombinant RSV expressing green fluorescent protein (rgRSV). A549 cells were highly permissive whereas BEAS-2B cells restricted infection to individual cells or small foci...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769338/the-perk-arm-of-the-unfolded-protein-response-negatively-regulates-transmissible-gastroenteritis-virus-replication-by-suppressing-protein-translation-and-promoting-type-i-ifn-production
#14
Mei Xue, Fang Fu, Yanlong Ma, Xin Zhang, Liang Li, Li Feng, Pinghuang Liu
Coronavirus replication is closely associated with the endoplasmic reticulum (ER), the primary cellular organelle for protein synthesis, folding, and modification. ER stress is a common consequence in coronavirus-infected cells. However, how the virus-induced ER stress influences coronavirus replication and pathogenesis remains controversial. Here, we demonstrated that infection with the alphacoronavirus transmissible gastroenteritis virus (TGEV) induced ER stress and triggered the unfolded protein response (UPR) in vitro and in vivo , and ER stress negatively regulated TGEV replication in vitro Although TGEV infection activated all three UPR pathways (ATF6, IRE1, and PERK), the virus-triggered UPR suppressed TGEV replication in both ST and IPEC-J2 cells primarily through activation of the PERK-eIF2α axis, as shown by functional studies with overexpression, siRNA, or specific chemical inhibitors...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769337/entry-of-herpes-simplex-virus-1-into-epidermis-and-dermal-fibroblasts-is-independent-of-the-scavenger-receptor-marco
#15
Katharina Thier, Maureen Möckel, Katja Palitzsch, Katinka Döhner, Beate Sodeik, Dagmar Knebel-Mörsdorf
To enter host cells, herpes simplex virus 1 (HSV-1) initially attaches to cell surface glycosaminoglycans followed by requisite binding to one of several cellular receptors leading to viral internalization. Although virus-receptor interactions have been studied in various cell lines, the contributions of individual receptors to uptake into target tissues such as mucosa, skin or cornea are not well understood. We demonstrated that nectin-1 acts as major receptor for HSV-1 entry into murine epidermis, while HVEM can serve as alternative receptor...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769336/cytoplasmic-re-localization-and-colocalization-with-viroplasms-of-host-cell-proteins-and-their-role-in-rotavirus-infection
#16
Poonam Dhillon, Varsha N Tandra, Sandip G Chorghade, Nima D Namsa, Lipika Sahoo, C Durga Rao
Rotavirus replicates in the cytoplasm of infected cells in unique virus-induced cytoplasmic inclusion bodies called viroplasms (VM), which are nucleated by two essential viral non-structural proteins NSP2 and NSP5. However, the precise composition of the VM, intracellular localization of host proteins during virus infection, their association with VM or role in rotavirus growth remained largely unexplored. Mass-spectrometry analyses revealed the presence of several host heterogeneous nuclear ribonucleoproteins (hnRNPs) and AU-rich element-binding proteins (ARE-BPs) and cytoplasmic proteins from uninfected MA104 cell extracts in the pull-down (PD) complexes of purified viroplasmic proteins NSP2 and NSP5...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769335/bag2-is-a-component-of-a-cytosolic-extraction-machinery-that-promotes-membrane-penetration-of-a-nonenveloped-virus
#17
Allison Dupzyk, Billy Tsai
During entry, the nonenveloped polyomavirus (PyV) SV40 traffics from the cell surface to the endoplasmic reticulum (ER) where it penetrates the ER membrane to reach the cytosol; the virus then transports into the nucleus to cause infection. Although a coherent understanding of SV40's host entry is emerging, how the virus is ejected from the ER into the cytosol remains mysterious. Our previous analyses revealed that the cytosolic Hsc70-SGTA-Hsp105 complex binds to and extracts SV40 from the ER into the cytosol...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769334/reovirus-nonstructural-protein-%C3%AF-ns-acts-as-an-rna-stability-factor-promoting-viral-genome-replication
#18
Paula F Zamora, Liya Hu, Jonathan J Knowlton, Roni M Lahr, Rodolfo A Moreno, Andrea J Berman, B V Venkataram Prasad, Terence S Dermody
Viral nonstructural proteins, which are not packaged into virions, are essential for replication of most viruses. Reovirus, a nonenveloped, double-stranded RNA (dsRNA) virus, encodes three nonstructural proteins that are required for viral replication and dissemination in the host. Reovirus nonstructural protein σNS is a single-stranded RNA (ssRNA)-binding protein that must be expressed in infected cells for production of viral progeny. However, activities of σNS during individual steps of the reovirus replication cycle are poorly understood...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769333/microglia-are-critical-in-host-defense-against-prion-disease
#19
James A Carroll, Brent Race, Katie Williams, James Striebel, Bruce Chesebro
Microglial cells in the central nervous system play important roles in neurodevelopment and resistance to infection, yet microglia can become neurotoxic under some conditions. An early event during prion infection is the activation of microglia and astrocytes in the brain prior to damage or death of neurons. Previous prion disease studies using two different strategies to manipulate signaling through the microglial receptor CSF-1R reported contrary effects on survival from prion disease. However, in these studies, reduction of microglial numbers and function were variable, thus confounding interpretation of the results...
May 16, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29769332/identification-of-plant-virus-receptor-candidates-in-the-stylets-of-their-aphid-vectors
#20
Craig G Webster, Elodie Pichon, Manuella van Munster, Baptiste Monsion, Maëlle Deshoux, Daniel Gargani, Federica Calevro, Jaime Jimenez, Aranzazu Moreno, Björn Krenz, Jeremy R Thompson, Keith L Perry, Alberto Fereres, Stéphane Blanc, Marilyne Uzest
Plant viruses transmitted by insects cause tremendous losses in most important crops around the world. The identification of receptors of plant viruses within their insect vectors is a key challenge to understanding the mechanisms of transmission, and offers an avenue for future alternative control strategies to limit viral spread. We here report the identification of two cuticular proteins within aphid mouthparts, and we provide experimental support for the role of one of them in the transmission of a non-circulative virus...
May 16, 2018: Journal of Virology
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