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RNA EDITING OF HEPATITIS DELTA VIRUS ANTIGENOME BY DSRNA-ADENOSINE DEAMINASE

机译:DSRNA-腺苷脱氨酶对肝炎三角洲病毒抗原组的RNA编辑

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HEPATITIS delta virus (HDV) is a subviral human pathogen that requires hepatitis B virus (HBV) for packaging(1,2). Concurrent infection by HBV and HDV increases the risk of severe liver disease compared to infection with HBV alone(3). The HDV genome is a closed circular RNA of about 1,700 bases which is replicated through an RNA intermediate, the antigenome(4). Both RNAs cars be folded into highly base-paired, rod-shaped structures, similar to the plant viroid RNAs(5). Two forms of the sole HDV protein, hepatitis delta antigen, are derived from a single open reading frame by RNA editing; the enzymes responsible for the editing have not been characterized, Here we report that the purified enzyme dsRAD (for double-stranded-RNA-adenosine deaminase) can edit HDV antigenomic RNA in vitro. Most important, we observe that mutations in critical sequences of the antigenome have identical effects on in vitro and in vivo editing, suggesting that dsRAD, or a closely related enzyme, is responsible for editing HDV RNA in vivo. [References: 27]
机译:HEPATITIS三角洲病毒(HDV)是一种亚病毒性人类病原体,需要乙型肝炎病毒(HBV)进行包装(1,2)。与单独感染HBV相比,同时感染HBV和HDV会增加罹患严重肝病的风险(3)。 HDV基因组是一个约1,700个碱基的闭合环状RNA,可通过RNA中间物,反基因组(4)复制。两种RNAs汽车都折叠成高度碱基配对的杆状结构,类似于植物类病毒RNAs(5)。两种单独的HDV蛋白形式,即肝炎三角洲抗原,是通过RNA编辑从单个开放阅读框中获得的。尚未报道负责编辑的酶的特征。在此,我们报道纯化的dsRAD酶(用于双链RNA腺苷脱氨酶)可以在体外编辑HDV反基因组RNA。最重要的是,我们观察到反基因组关键序列中的突变对体外和体内编辑具有相同的作用,这表明dsRAD或密切相关的酶负责体内HDV RNA的编辑。 [参考:27]

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