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SARS VIRUS

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https://www.readbyqxmd.com/read/29339515/mers-cov-and-h5n1-influenza-virus-antagonize-antigen-presentation-by-altering-the-epigenetic-landscape
#1
Vineet D Menachery, Alexandra Schäfer, Kristin E Burnum-Johnson, Hugh D Mitchell, Amie J Eisfeld, Kevin B Walters, Carrie D Nicora, Samuel O Purvine, Cameron P Casey, Matthew E Monroe, Karl K Weitz, Kelly G Stratton, Bobbie-Jo M Webb-Robertson, Lisa E Gralinski, Thomas O Metz, Richard D Smith, Katrina M Waters, Amy C Sims, Yoshihiro Kawaoka, Ralph S Baric
Convergent evolution dictates that diverse groups of viruses will target both similar and distinct host pathways to manipulate the immune response and improve infection. In this study, we sought to leverage this uneven viral antagonism to identify critical host factors that govern disease outcome. Utilizing a systems-based approach, we examined differential regulation of IFN-γ-dependent genes following infection with robust respiratory viruses including influenza viruses [A/influenza/Vietnam/1203/2004 (H5N1-VN1203) and A/influenza/California/04/2009 (H1N1-CA04)] and coronaviruses [severe acute respiratory syndrome coronavirus (SARS-CoV) and Middle East respiratory syndrome CoV (MERS-CoV)]...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29335200/discovery-and-optimization-of-phthalazinone-derivatives-as-a-new-class-of-potent-dengue-virus-inhibitors
#2
Dong Lu, Jianan Liu, Yunzhe Zhang, Feifei Liu, Limin Zeng, Runze Peng, Li Yang, Huazhou Ying, Wei Tang, Wuhong Chen, Jianping Zuo, Xiankun Tong, Tao Liu, Youhong Hu
Using a dengue replicon cell line-based screening, we identified 3-(dimethylamino)propyl(3-((4-(4-fluorophenyl)-1-oxophthalazin-2(1H)-yl)methyl)phenyl)carbamate (10a) as a potent DENV-2 inhibitor, with an IC50 value of 0.64 μM. A series of novel phthalazinone derivatives based on hit 10a were synthesized and evaluated for their in vitro anti-DENV activity and cytotoxicity. The subsequent SAR study and optimization led to the discovery of the most promising compound 14l, which displayed potent anti-DENV-2 activity, with low IC50 value against DENV-2 RNA replication of 0...
January 5, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29331670/circulation-of-alphacoronavirus-betacoronavirus-and-paramyxovirus-in-hipposideros-bat-species-in-zimbabwe
#3
Mathieu Bourgarel, Davies M Pfukenyi, Vanina Boué, Loïc Talignani, Ngoni Chiweshe, Fodé Diop, Alexandre Caron, Gift Matope, Dorothée Missé, Florian Liégeois
Bats carry a great diversity of zoonotic viruses with a high-impact on human health and livestock. Since the emergence of new coronaviruses and paramyxoviruses in humans (e.g. Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) and Nipah virus), numerous studies clearly established that bats can maintain some of these viruses. Improving our understanding on the role of bats in the epidemiology of the pathogens they harbour is necessary to prevent cross-species spill over along the wild/domestic/human gradient...
January 10, 2018: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29321334/mechanism-of-hiv-1-resistance-to-an-electronically-constrained-%C3%AE-helical-peptide-membrane-fusion-inhibitor
#4
Xiyuan Wu, Zixuan Liu, Xiaohui Ding, Danwei Yu, Huamian Wei, Bo Qin, Yuanmei Zhu, Huihui Chong, Sheng Cui, Yuxian He
SC29EK is an electronically constrained α-helical peptide HIV-1 fusion inhibitor highly effective against both wild-type and enfuvirtide (T20)-resistant viruses. In this study, we focused on investigating the mechanism of HIV-1 resistance to SC29EK by two approaches. First, SC29EK-escaping HIV-1 variants were selected and characterized. Three mutant viruses, which possessed two (E43K/E49A) or three (Q39R/N43K/N126K, N43K/E49A/N126K) amino acid substitutions in the N- and C-terminal repeat regions of gp41 were identified as conferring high resistance to SC29EK and cross-resistance to the first-generation (T20, C34) and newly-designed (sifuvirtide, MT-SC29EK, 2P23) fusion inhibitors...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29317151/structure-activity-relationships-of-cryptopleurine-analogs-with-e-ring-modifications-as-anti-hepatitis-c-virus-agents
#5
Ying Wang, Shao-Ru Chen, Xiaoming Yang, Kuo-Hsiung Lee, Yung-Chi Cheng
The tylophorine analog rac-cryptopleurine exhibited potent anti-hepatitis C virus (HCV) activity through allosteric regulation of ATPase activity of heat shock cognate protein 70 (Hsc70). We evaluated the impact of modifications on the E-ring of rac-cryptopleurine to the inhibitory activity against HCV replication and regulation of ATPase activity of Hsc70. Cryptopleurine analog YXM-110 with a 13α-hydroxyl group maintained activity against HCV and promoted ATP/ADP turnover of Hsc70; however, compounds with hydroxyl groups at other positions or with other orientations (YXM-109, YXM-139, and YXM-140) did not exhibit similar activities...
December 20, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29299855/the-persistent-prevalence-and-evolution-of-cross-family-recombinant-coronavirus-gccdc1-among-a-bat-population-a-two-year-follow-up
#6
Joseph O Obameso, Hong Li, Hao Jia, Min Han, Shiyan Zhu, Canping Huang, Yuhui Zhao, Min Zhao, Yu Bai, Fei Yuan, Honglan Zhao, Xia Peng, Wen Xu, Wenjie Tan, Yingze Zhao, Kwok-Yung Yuen, William J Liu, Lin Lu, George F Gao
Bats are connected with the increasing numbers of emerging and re-emerging viruses that may break the species barrier and spread into the human population. Coronaviruses are one of the most common viruses discovered in bats, which were considered as the natural source of recent human-susceptible coronaviruses, i.e. SARS-COV and MERS-CoV. Our previous study reported the discovery of a bat-derived putative cross-family recombinant coronavirus with a reovirus gene p10, named as Ro-BatCoV GCCDC1. In this report, through a two-year follow-up of a special bat population in one specific cave of south China, we illustrate that Ro-BatCoV GCCDC1 persistently circulates among bats...
December 1, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/29284418/the-aetiologies-of-central-nervous-system-infections-in-hospitalised-cambodian-children
#7
Paul Turner, Kuong Suy, Le Van Tan, Pora Sar, Thyl Miliya, Nguyen Thi Thu Hong, Vu Thi Ty Hang, Nguyen Thi Han Ny, Sona Soeng, Nicholas P J Day, H Rogier van Doorn, Claudia Turner
BACKGROUND: Central nervous system (CNS) infections are an important cause of childhood morbidity and mortality. The aetiologies of these potentially vaccine-preventable infections have not been well established in Cambodia. METHODS: We did a one year prospective study of children hospitalised with suspected CNS infection at Angkor Hospital for Children, Siem Reap. Cerebrospinal fluid specimens (CSF) samples underwent culture, multiplex PCR and serological analysis to identify a range of bacterial and viral pathogens...
December 29, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29279395/structural-and-molecular-basis-of-mismatch-correction-and-ribavirin-excision-from-coronavirus-rna
#8
François Ferron, Lorenzo Subissi, Ana Theresa Silveira De Morais, Nhung Thi Tuyet Le, Marion Sevajol, Laure Gluais, Etienne Decroly, Clemens Vonrhein, Gérard Bricogne, Bruno Canard, Isabelle Imbert
Coronaviruses (CoVs) stand out among RNA viruses because of their unusually large genomes (∼30 kb) associated with low mutation rates. CoVs code for nsp14, a bifunctional enzyme carrying RNA cap guanine N7-methyltransferase (MTase) and 3'-5' exoribonuclease (ExoN) activities. ExoN excises nucleotide mismatches at the RNA 3'-end in vitro, and its inactivation in vivo jeopardizes viral genetic stability. Here, we demonstrate for severe acute respiratory syndrome (SARS)-CoV an RNA synthesis and proofreading pathway through association of nsp14 with the low-fidelity nsp12 viral RNA polymerase...
December 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29275820/physiological-and-molecular-triggers-for-sars-cov-membrane-fusion-and-entry-into-host-cells
#9
Jean Kaoru Millet, Gary R Whittaker
During viral entry, enveloped viruses require the fusion of their lipid envelope with host cell membranes. For coronaviruses, this critical step is governed by the virally-encoded spike (S) protein, a class I viral fusion protein that has several unique features. Coronavirus entry is unusual in that it is often biphasic in nature, and can occur at or near the cell surface or in late endosomes. Recent advances in structural, biochemical and molecular biology of the coronavirus S protein has shed light on the intricacies of coronavirus entry, in particular the molecular triggers of coronavirus S-mediated membrane fusion...
December 21, 2017: Virology
https://www.readbyqxmd.com/read/29246504/a-recombinant-vsv-vectored-mers-cov-vaccine-induces-neutralizing-antibody-and-t-cell-responses-in-rhesus-monkeys-after-single-dose-immunization
#10
Renqiang Liu, Jinliang Wang, Yu Shao, Xijun Wang, Huilei Zhang, Lei Shuai, Jinying Ge, Zhiyuan Wen, Zhigao Bu
Middle East respiratory syndrome coronavirus (MERS-CoV) has been a highly threatening zoonotic pathogen since its outbreak in 2012. Similar to SARS-CoV, MERS-CoV belongs to the coronavirus family and can induce severe respiratory symptoms in humans, with an average case fatality rate of 35% according to the World Health Organization. Spike (S) protein of MERS-CoV is immunogenic and can induce neutralizing antibodies, thus is a potential major target for vaccine development. Here we constructed a chimeric virus based on the vesicular stomatitis virus (VSV) in which the G gene was replaced by MERS-CoV S gene (VSVΔG-MERS)...
December 12, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29237834/structural-basis-for-the-inhibition-of-host-gene-expression-by-porcine-epidemic-diarrhea-virus-nsp1
#11
Zhou Shen, Gang Ye, Feng Deng, Gang Wang, Min Cui, Liurong Fang, Shaobo Xiao, Zhen F Fu, Guiqing Peng
Porcine epidemic diarrhea virus (PEDV), an enteropathogenic Alphacoronavirus, has caused enormous economic losses in the pork industry. The non-structural protein 1 (nsp1) is a characteristic feature of Alpha- and Beltacoronaviruses, which exhibits both functional conservation and mechanistic diversity in inhibiting host gene expression and antiviral responses. However, the detailed structure and molecular mechanisms underlying the Alphacoronavirus nsp1 inhibition of host gene expression remain unclear. Here, we report the first full-length crystal structure of Alphacoronavirus nsp1 from PEDV...
December 13, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29219990/bat-cave-solves-mystery-of-deadly-sars-virus-and-suggests-new-outbreak-could-occur
#12
David Cyranoski
No abstract text is available yet for this article.
December 7, 2017: Nature
https://www.readbyqxmd.com/read/29212937/experimental-adaptive-evolution-of-sivcpz-to-pandemic-hiv-1-using-a-humanized-mouse-model
#13
Kei Sato, Naoko Misawa, Junko S Takeuchi, Tomoko Kobayashi, Taisuke Izumi, Hirofumi Aso, Shumpei Nagaoka, Keisuke Yamamoto, Izumi Kimura, Yoriyuki Konno, Yusuke Nakano, Yoshio Koyanagi
HIV-1, the causative agent of AIDS, is originated from SIVcpz, the chimpanzee precursor of the human virus, approximately 100 years ago. This indicates that HIV-1 has emerged through the cross-species transmission of SIVcpz from chimpanzees to humans. However, it remains unclear how SIVcpz has evolved into pandemic HIV-1 in humans. To address this question, we inoculated three SIVcpz (MB897, EK505, and MT145), four pandemic HIV-1 (NL4-3, NLCSFV3, JRCSF and AD8) and 2 non-pandemic HIV-1 (YBF30 and DJO0131) strains...
December 6, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29207494/an-opportunistic-pathogen-afforded-ample-opportunities-middle-east-respiratory-syndrome-coronavirus
#14
REVIEW
Ian M Mackay, Katherine E Arden
The human coronaviruses (CoV) include HCoV-229E, HCoV-OC43, HCoV-NL63, and HCoV-HKU1, some of which have been known for decades. The severe acute respiratory syndrome (SARS) CoV briefly emerged into the human population but was controlled. In 2012, another novel severely human pathogenic CoV-the Middle East Respiratory Syndrome (MERS)-CoV-was identified in the Kingdom of Saudi Arabia; 80% of over 2000 human cases have been recorded over five years. Targeted research remains key to developing control strategies for MERS-CoV, a cause of mild illness in its camel reservoir...
December 2, 2017: Viruses
https://www.readbyqxmd.com/read/29201911/transmissible-gastroenteritis-virus-papain-like-protease-1-antagonizes-production-of-interferon-%C3%AE-through-its-deubiquitinase-activity
#15
Xiaoliang Hu, Jin Tian, Hongtao Kang, Dongchun Guo, Jiasen Liu, Dafei Liu, Qian Jiang, Zhijie Li, Juanjuan Qu, Liandong Qu
Coronaviruses (CoVs), such as human coronavirus NL63 (HCoV-NL63), severe acute respiratory syndrome CoV (SARS-CoV), murine hepatitis virus (MHV), porcine epidemic diarrhea virus (PEDV), and Middle East Respiratory Syndrome Coronavirus (MERS-CoV), encode papain-like (PL) proteases that inhibit Sendai virus- (SeV-) induced interferon (IFN-β) production. Recently, the crystal structure of transmissible gastroenteritis virus (TGEV) PL1 has been solved, which was similar to that of SARS-CoV PL2pro, which may antagonize host innate immunity...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29199039/the-coronavirus-nucleocapsid-protein-is-adp-ribosylated
#16
Matthew E Grunewald, Anthony R Fehr, Jeremiah Athmer, Stanley Perlman
ADP-ribosylation is a common post-translational modification, although how it modulates RNA virus infection is not well understood. While screening for ADP-ribosylated proteins during coronavirus (CoV) infection, we detected a ~55kDa ADP-ribosylated protein in mouse hepatitis virus (MHV)-infected cells and in virions, which we identified as the viral nucleocapsid (N) protein. The N proteins of porcine epidemic diarrhea virus (PEDV), severe acute respiratory syndrome (SARS)-CoV and Middle East respiratory syndrome (MERS)-CoV were also ADP-ribosylated...
November 30, 2017: Virology
https://www.readbyqxmd.com/read/29186061/identification-of-alpha-and-beta-coronavirus-in-wildlife-species-in-france-bats-rodents-rabbits-and-hedgehogs
#17
Elodie Monchatre-Leroy, Franck Boué, Jean-Marc Boucher, Camille Renault, François Moutou, Meriadeg Ar Gouilh, Gérald Umhang
Coronaviruses are closely monitored in the context of emerging diseases and, as illustrated with Severe Acute Respiratory Syndrome coronavirus (SARS-CoV) and Middle East Respiratory Syndrome-coronavirus (MERS-CoV), are known to cross the species barrier and eventually to move from wildlife to humans. Knowledge of the diversity of coronaviruses in wildlife is therefore essential to better understand and prevent emergence events. This study explored the presence of coronaviruses in four wild mammal orders in France: Bats, rodents, lagomorphs, and hedgehogs...
November 29, 2017: Viruses
https://www.readbyqxmd.com/read/29166910/prevalence-and-genetic-diversity-analysis-of-human-coronaviruses-among-cross-border-children
#18
Peilin Liu, Lei Shi, Wei Zhang, Jianan He, Chunxiao Liu, Chunzhong Zhao, Siu Kai Kong, Jacky Fong Chuen Loo, Dayong Gu, Longfei Hu
BACKGROUND: More than a decade after the outbreak of human coronaviruses (HCoVs) SARS in Guangdong province and Hong Kong SAR of China in 2002, there is still no reoccurrence, but the evolution and recombination of the coronaviruses in this region are still unknown. Therefore, surveillance on the prevalence and the virus variation of HCoVs circulation in this region is conducted. METHODS: A total of 3298 nasopharyngeal swabs samples were collected from cross-border children (<6 years, crossing border between Southern China and Hong Kong SAR) showing symptoms of respiratory tract infection, such as fever (body temperature > 37...
November 22, 2017: Virology Journal
https://www.readbyqxmd.com/read/29162711/expression-and-cleavage-of-middle-east-respiratory-syndrome-coronavirus-nsp3-4-polyprotein-induce-the-formation-of-double-membrane-vesicles-that-mimic-those-associated-with-coronaviral-rna-replication
#19
Diede Oudshoorn, Kevin Rijs, Ronald W A L Limpens, Kevin Groen, Abraham J Koster, Eric J Snijder, Marjolein Kikkert, Montserrat Bárcena
Betacoronaviruses, such as Middle East respiratory syndrome coronavirus (MERS-CoV), are important pathogens causing potentially lethal infections in humans and animals. Coronavirus RNA synthesis is thought to be associated with replication organelles (ROs) consisting of modified endoplasmic reticulum (ER) membranes. These are transformed into double-membrane vesicles (DMVs) containing viral double-stranded RNA and into other membranous elements such as convoluted membranes, together forming a reticulovesicular network...
November 21, 2017: MBio
https://www.readbyqxmd.com/read/29162476/prevention-and-treatment-of-respiratory-viral-infections-presentations-on-antivirals-traditional-therapies-and-host-directed-interventions-at-the-5th-isirv-antiviral-group-conference
#20
Jennifer L McKimm-Breschkin, Shibo Jiang, David S Hui, John H Beigel, Elena A Govorkova, Nelson Lee
The International Society for Influenza and other Respiratory Virus Diseases held its 5th Antiviral Group (isirv-AVG) Conference in Shanghai, China, in conjunction with the Shanghai Public Health Center and Fudan University from 14-16 June, 2017. The three-day programme encompassed presentations on some of the clinical features, management, immune responses and virology of respiratory infections, including influenza A(H1N1)pdm09 and A(H7N9) viruses, MERS-CoV, SARS-CoV, adenovirus Type 80, enterovirus D68, metapneumovirus and respiratory syncytial virus (RSV)...
November 18, 2017: Antiviral Research
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