Molecular details of the doublestranded RNA virus replication and assembly Outi Leena Lyytinen Molecular and Integrative Biosciences Research Programme Faculty of Biological and Environmental Sciences and Doctoral Programme in Integrative Life Science University of Helsinki ACADEMIC DISSERTATION To be presented for public discussion with the permission of the Faculty ofIn this paper, using a cellfree replication assay supporting a full cycle of viral replication, we show that replication of Tomato bushy stunt virus (TBSV) leads to the formation of doublestranded RNA (dsRNA) Using RNase digestion, DNAzyme, and RNA mobility shift assays, we demonstrate the absence of naked (−)RNA templates during replication Time course experiments showed RNA viruses replicate their genomes via one of two unique pathways—either by RNAdependent RNA synthesis, or among the retroviruses, by RNAdependent DNA synthesis (reverse transcription) followed by DNA replication and transcription
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Example of double stranded rna virus
Example of double stranded rna virus- There are doublestranded (ds) RNA viruses with dsRNA genomes, as well as () and (−)RNA viruses whose genomes are singlestranded (ss) RNA of either positive or negative polarity RNA viruses have small genomes that rarely exceed 30 kb in size, and a large portion of their genomes is used to encode proteins involved in viral RNA replication Viral RNA synthesisThere are three distinct groups of RNA viruses depending on their genome and mode of replication Doublestranded RNA viruses (Group III) contain from one to a dozen different RNA molecules, each coding for one or more viral proteins
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The doublestranded genome is used to transcribe a positivestrand RNA by the viral RNAdependent RNA polymerase (RdRp) The positivestrand RNA may be used as messenger RNA (mRNA) which can be translated into viral proteins by the host cell's ribosomes The results suggest that the majority of SARSCoV doublestranded RNA, and possibly RNA synthesis, resides within the interior of the DMV vesicles, while virion budding occurs from the cytosolThe mode of replication of the L doublestranded RNA (dsRNA) present in viruslike particles in Saccharomyces cerevisiae was examined by density transfer experiments After transfer to light medium, significant amounts of fully heavy dsRNA persisted over a number of cell doublings
It is an enveloped virus with an icosahedral nucleocapsid that contains a doublestranded linear DNA genome, and thus replicates in the nucleus Choice C The exception to the rule regarding RNA viruses is the family Orthomyxoviridae, the influenza viruses Orthomyxoviruses undergo transcription and RNA replication in the nucleus of the hostThey have genomes made of RNA, which are single instead of doublestranded Their genomes are negative sense, meaning that messenger RNA (mRNA) can be synthesized directly from the genome by the viral enzyme RNAdependent RNA polymerase (RdRp), also called RNA replicase, which is encoded by all −ssRNA virusesKeywords doublestranded RNA, patterntriggered immunity, receptor recognition, subcellular localization, vesicle transport, virus infection INTRODUCTION Recognition of viral doublestranded (ds)RNA is a major mecha nism in plant antiviral defence via RNA silencing and patterntriggered immunity (PTI) dsRNA is a common pattern formed during replication of RNA and
Virus replication will be discussed in three stages (1) early events (attachment to susceptible cells, penetration and uncoating), (2) viral biosynthetic events (replication of the viral genome, transcription and translation) and (3) virion assemblyReplication and transcription in dsRNA viruses may be either conservative or semiconservative That is, the plus strand extruded during transcription may be either the parental strand (semiconservative) or the newly synthesized strand (conservative)Replication occurs in host cytoplasm and converts ssmRNA to dsgenomic RNA But dsRNA is a kind of molecule that cells do not produce, and eukaryotic hosts have various antiviral systems that detect and inactivate dsRNA To circumvent this defenses, many dsRNA viruses are replicating their RNA inside icosahedral capsids The RNA polymerases are situated at the fivefold axis of
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RNA VIRUS REPLICATION GENERAL STRATEGIES RNA viruses that do not have a DNA phase Viruses that replicate via RNA intermediates need an RNAdependent RNApolymerase to replicate their RNA, but animal cells do not seem to possess a suitable enzyme Therefore, this type of animal RNA virus needs to code for an RNAdependent RNA polymerase No viral A largescale expansion of the P1 shell occurs during RNA packaging to empty particles and subsequent RNA replication 22,23 Doublestranded RNA virus outer shell assembly by bona fide domain The replication of these virus genomes occurs in the nucleus, involving the formation of a doublestranded intermediate which serves as a template for the synthesis of new singlestranded genomes
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West Nile virus (WNV) is a positivestranded RNA virus that produces doublestranded RNA (dsRNA) during replication Engagement of Tolllike receptor 3 with dsRNA initiates tumor necrosis factoralpha receptor 1 signaling in peripheral lymphoid tissues This could disrupt the integrity of the bloodbrain barrier, thereby facilitating WNV entry into central nervousDoublestranded RNA virus replication and packaging Doublestranded RNA virus replication and packaging Doublestranded RNA virus replication and packaging Doublestranded RNA virus replication and packaging J Biol Chem 1993 Feb This differs from the replication of doublestranded DNA and RNA viruses, where empty capsids are made first and later filled by the genome The close relationship between replication of the viral
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EspadaMurao, L A & Morita, K Delayed cytosolic exposure of Japanese encephalitis virus doublestranded RNA impedes interferon activation and enhances viral dissemination in porcine cells JBy the doublestranded RNA (dsRNA) intermediates ofþRNA virus replication 2,9,10 Defining the structure–function relationships that govern the membraneassociated replication of þRNA viruses, a large virus cluster including many important pathogens, will enhance our general understanding of their molecular biology and may have important For brome mosaic virus, we previously showed that such spherules serve as compartments or miniorganelles for RNA replication and that their assembly, structure, and function have similarities to the replicative cores of retrovirus and doublestranded RNA virus virions Some other ()RNA viruses conduct RNA replication in association with individual or
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We report that, through the use of an antibody specific for doublestranded RNA (dsRNA), dsRNA is readily detectable in Huh7 cells that contain replicating HCV JFH1 genomes but is absent in control cells Therefore, as that of other RNA virus genomes, the replication of the HCV genome may involve the generation of a dsRNA replicative intermediate In Huh7 cells supporting HCV The replication of poxvirus is unusual for a virus with doublestranded DNA genome (dsDNA) because it occurs in the cytoplasm, although this is typical of other large DNA viruses Poxvirus encodes its own machinery for genome transcription, a DNA dependent RNA polymerase, which makes replication in the cytoplasm possible Most dsDNA viruses require the host cell'sWe report that, through the use of an antibody specific for doublestranded RNA (dsRNA), dsRNA is readily detectable in Huh7 cells that contain replicating HCV JFH1
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Doublestranded RNA (dsRNA) is a mandatory intermed Plant RNA viruses are obligate intracellular parasites that hijack specific cellular membranes to replicate their genomes in what are commonly known as viral replication complexes (VRC) These contain host and virusencoded proteins and viral RNAINTRODUCTION Virus infection & replication – A synonym Virus is a nucleoprotein having RNA or DNA as a genetic material RNA or DNA may be ss or ds, ssRNA may be ve or –ve sense Most of plant virus infect a limited number of different plant species and a few have a wide host range Viruses do not produce any kind of reproductive structure, theyYeast RNA viruses include LA (and its toxinencoding satellites M1, M2, ) and LBC dsRNA viruses and the singlestranded replicons S RNA and 23S RNA LA has a singlesegment 46kb linear genome encoding a major coat protein (gag) and its RNAdependent RNA polymerase (pol), the latter expressed as a gagpol fusion protein formed by a 1 ribosomal frameshift In
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For doublestranded (ds) DNA viruses, we studied the replicationincompetent poxvirus modified vaccinia Ankara (MVA) and herpes simplex virus 1 (HSV1) We used Semliki Forrest virus (SFV) as a positivesense singlestranded (ss) RNA virus and measles virus (MV) as a negativesense ssRNA virus The two DNA viruses and MV readily infected keratinocytes, as observed byRNA structural requirements for RNA binding, replication, and packaging in the yeast doublestranded RNA virus Shen Y(1), Bruenn JA Author information (1)Department of Biological Sciences, State University of New York, Buffalo Several sites of interaction with viral proteins have been mapped in the plus strand of the Saccharomyces cerevisiae doubleThe genomes of doublestranded (ds)RNA viruses are never exposed to the cytoplasm but are confined to and replicated from a specialized proteinbound compartmentthe viral capsid
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As a result, they are remarkably adept at antagonizing doublestranded RNA (dsRNA) For each virus, replication was similar in cells from four different individuals, although the extent of replication was somewhat variable The trends in replication kinetics, however, were significantly different between SARSCoV2 and MERSCoV infections Replication of SARSNOTE Symmetrical transcription of DNA gives rise to doublestranded RNA DNA virus replication with the exception of the poxviruses, all DNA viruses replicate in the nucleus In some cases one of the DNA strands is transcribed (in others both strands of a small part of the DNA may be transcribed) (step 4) into specific mRNA, which in turn is translated (step 5) to synthesize Abstract The family Reoviridae is a nonenveloped virus group with a doublestranded (ds) RNA genome comprising 9 to 12 segments In the family Reoviridae, the genera Cardoreovirus, Phytoreovirus, Seadornavirus, Mycoreovirus, and Coltivirus contain virus species having 12segmented dsRNA genomes Reverse genetics systems used to generate recombinant
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Intracellular doublestranded RNA (dsRNA) is a chief sign of replication for many viruses Host mechanisms detect the dsRNA and initiate antiviral responses In this report, we identify retinoic Despite major differences in the life cycles of the seven different classes of known viruses, the genomereplication processes of certain positivestrand RNA viruses, doublestranded RNA virusesThe convoluted membranes were most abundantly immunolabeled for viral replicase subunits However, doublestranded RNA, presumably revealing the site of viral RNA synthesis, mainly localized to the DMV interior
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