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Statements

Subject Item
dbr:DCL3
dbo:wikiPageWikiLink
dbr:RNA_polymerase_IV
Subject Item
dbr:Α-Amanitin
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Subject Item
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rdf:type
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rdfs:label
RNA-polymerase IV ARN polymérase IV RNA polymerase IV
rdfs:comment
L'ARN polymérase IV est une nucléotidyltransférase présente dans les cellules des eucaryotes (chez les plantes uniquement). C'est l'une des ARN polymérases de ces organismes, avec l'ARN polymérase I, l'ARN polymérase II et l'ARN polymérase III. Elle est spécifique du génome des plantes et réalise la transcription de l'ADN pour produire de petits ARN interférents. Elle joue un rôle essentiel dans la protection du génome des plantes contre les virus et les éléments transposables par méthylation de l'ADN dirigée par l'ARN. RNA polymerase IV (RNAP IV) is an enzyme that synthesizes small interfering RNA (siRNA) in plants, which silence gene expression. RNAP IV belongs to a family of enzymes that catalyze the process of transcription known as RNA Polymerases, which synthesize RNA from DNA templates. Discovered via phylogenetic studies of land plants, genes of RNAP IV are thought to have resulted from multistep evolution processes that occurred in RNA Polymerase II phylogenies. Such an evolutionary pathway is supported by the fact that RNAP IV is composed of 12 protein subunits that are either similar or identical to RNA polymerase II, and is specific to plant genomes. Via its synthesis of siRNA, RNAP IV is involved in regulation of heterochromatin formation in a process known as RNA directed DNA Methylation (Rd RNA-polymerase IV is een RNA-polymerase, dat betrokken is bij de productie van small interfering RNA (siRNA) bij planten. Het is een afgeleide van RNA-polymerase II. Bij jonge somatische embryo's komt RNA-polymerase IV in de celkern voor, terwijl bij meer ontwikkeld ouder weefsel het in het cytoplasma voorkomt. RNA-polymerase IV is specifiek voor plantengenomen en is nodig voor de vorming van meer dan 90% van het 24-nucleotide lang heterochromatische siRNA. RNA-polymerase IV bestaat uit 12 subeenheden, waarvan veel gemeenschappelijk met die van RNA-polymerase II en RNA-polymerase V.
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dbo:abstract
RNA-polymerase IV is een RNA-polymerase, dat betrokken is bij de productie van small interfering RNA (siRNA) bij planten. Het is een afgeleide van RNA-polymerase II. Bij jonge somatische embryo's komt RNA-polymerase IV in de celkern voor, terwijl bij meer ontwikkeld ouder weefsel het in het cytoplasma voorkomt. RNA-polymerase IV is specifiek voor plantengenomen en is nodig voor de vorming van meer dan 90% van het 24-nucleotide lang heterochromatische siRNA. RNA-polymerase IV bestaat uit 12 subeenheden, waarvan veel gemeenschappelijk met die van RNA-polymerase II en RNA-polymerase V. RNA polymerase IV (RNAP IV) is an enzyme that synthesizes small interfering RNA (siRNA) in plants, which silence gene expression. RNAP IV belongs to a family of enzymes that catalyze the process of transcription known as RNA Polymerases, which synthesize RNA from DNA templates. Discovered via phylogenetic studies of land plants, genes of RNAP IV are thought to have resulted from multistep evolution processes that occurred in RNA Polymerase II phylogenies. Such an evolutionary pathway is supported by the fact that RNAP IV is composed of 12 protein subunits that are either similar or identical to RNA polymerase II, and is specific to plant genomes. Via its synthesis of siRNA, RNAP IV is involved in regulation of heterochromatin formation in a process known as RNA directed DNA Methylation (RdDM). L'ARN polymérase IV est une nucléotidyltransférase présente dans les cellules des eucaryotes (chez les plantes uniquement). C'est l'une des ARN polymérases de ces organismes, avec l'ARN polymérase I, l'ARN polymérase II et l'ARN polymérase III. Elle est spécifique du génome des plantes et réalise la transcription de l'ADN pour produire de petits ARN interférents. Elle joue un rôle essentiel dans la protection du génome des plantes contre les virus et les éléments transposables par méthylation de l'ADN dirigée par l'ARN.
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