Epstein-Barr virus-encoded microRNA miR-BART2 down-regulates the viral DNA polymerase BALF5.

Epstein-Barr virus-encoded microRNA miR-BART2 down-regulates the viral DNA polymerase BALF5.
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爱泼斯坦 - 巴尔病毒编码的microRNA mir-bart2下调病毒DNA聚合酶BALF5。

DOI:
10.1093/nar/gkm1080
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发表时间:
2008-02
影响因子:
14.9
通讯作者:
Graesser, Friedrich A.
Graesser, Friedrich A.
中科院分区:
生物学2区
文献类型:
--
作者:
Barth, Stephanie;Pfuhl, Thorsten;Mamiani, Alfredo;Ehses, Claudia;Roemer, Klaus;Kremmer, Elisabeth;Jaeker, Christoph;Hoeck, Julia;Meister, Gunter;Graesser, Friedrich A.

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微小RNA(miRNAs)参与序列特异性切割、翻译抑制或特异性靶mRNA的去腺苷酸化,导致转录后基因沉默。EB病毒编码23种功能未知的miRNAs。在这里,我们发现EBV编码的miRNA miR-BART 2下调病毒DNA聚合酶BALF 5。MiR-BART 2凭借其与其靶标的完全互补性在BALF 5的3′-非翻译区(3′UTR)内引导切割。裂解性病毒复制周期的诱导导致miR-BART 2水平的降低,同时BALF 5 3′UTR的切割强烈降低。miR-BART 2的表达下调了含有BALF 5 3′UTR的荧光素酶报告基因的活性。在裂解性复制期间miR-BART 2的强制表达导致BALF 5蛋白水平降低40-50%,并且从EBV感染的细胞释放的病毒量降低20%。我们的研究结果与EBV-miR-BART 2抑制从潜伏性到裂解性病毒复制的转变的观点是一致的。
MicroRNAs (miRNAs) have been implicated in sequence-specific cleavage, translational repression or deadenylation of specific target mRNAs resulting in post-transcriptional gene silencing. Epstein–Barr virus (EBV) encodes 23 miRNAs of unknown function. Here we show that the EBV-encoded miRNA miR-BART2 down-regulates the viral DNA polymerase BALF5. MiR-BART2 guides cleavage within the 3′-untranslated region (3′UTR) of BALF5 by virtue of its complete complementarity to its target. Induction of the lytic viral replication cycle results in a reduction of the level of miR-BART2 with a strong concomitant decrease of cleavage of the BALF5 3′UTR. Expression of miR-BART2 down-regulates the activity of a luciferase reporter gene containing the BALF5 3′UTR. Forced expression of miR-BART2 during lytic replication resulted in a 40–50% reduction of the level of BALF5 protein and a 20% reduction of the amount of virus released from EBV-infected cells. Our results are compatible with the notion that EBV-miR-BART2 inhibits transition from latent to lytic viral replication.
DOI: 10.1261/rna.7135204
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