Functional Analyses of Bovine Foamy Virus-Encoded miRNAs Reveal the Importance of a Defined miRNA for Virus Replication and Host-Virus Interaction.

Functional Analyses of Bovine Foamy Virus-Encoded miRNAs Reveal the Importance of a Defined miRNA for Virus Replication and Host-Virus Interaction.
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DOI:
10.3390/v12111250
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发表时间:
2020-11-02
期刊:
Viruses
影响因子:
--
通讯作者:
Löchelt M
Löchelt M
中科院分区:
其他
文献类型:
--
作者:
Cao W;Stricker E;Hotz-Wagenblatt A;Heit-Mondrzyk A;Pougialis G;Hugo A;Kuźmak J;Materniak-Kornas M;Löchelt M

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除了调节蛋白或辅助蛋白外,一些复杂的逆转录病毒还获得了一系列微小RNA(miRNAs)来调节和控制病毒-宿主相互作用,以实现有效的复制和传播。特别是,牛和猿猴泡沫病毒(BFV和SFV)最近已被证明表达一组不同的RNA聚合酶III指导的miRNA,一些具有独特的初级miRNA双发夹,哑铃形结构,在其他病毒或生物体中未知。虽然表达机制和结构要求已被研究,但这些miRNAs的功能重要性仍远未被理解。在这里,我们描述了BFV miRNA靶点的计算机识别和随后的实验验证牛锚蛋白重复结构域17(ANKRD 17)和Bif 1(Bif 1)靶基因在体外,最后,抑制ANKRD 17下游基因在受影响的途径。在长末端重复序列的U3区的非编码部分中的整个miRNA盒的缺失减弱了相应BFV突变体在牛细胞中的复制。这种抑制可以通过最丰富的miRNA BF 2 - 5 p几乎完全反式互补,所述最丰富的miRNA BF 2 - 5 p具有预测和验证的BFV miRNA靶基因的最佳得分。miRNA盒的缺失不会严重影响颗粒释放和总体颗粒组成。
In addition to regulatory or accessory proteins, some complex retroviruses gain a repertoire of micro-RNAs (miRNAs) to regulate and control virus–host interactions for efficient replication and spread. In particular, bovine and simian foamy viruses (BFV and SFV) have recently been shown to express a diverse set of RNA polymerase III-directed miRNAs, some with a unique primary miRNA double-hairpin, dumbbell-shaped structure not known in other viruses or organisms. While the mechanisms of expression and structural requirements have been studied, the functional importance of these miRNAs is still far from understood. Here, we describe the in silico identification of BFV miRNA targets and the subsequent experimental validation of bovine Ankyrin Repeat Domain 17 (ANKRD17) and Bax-interacting factor 1 (Bif1) target genes in vitro and, finally, the suppression of ANKRD17 downstream genes in the affected pathway. Deletion of the entire miRNA cassette in the non-coding part of the U3 region of the long terminal repeats attenuated replication of corresponding BFV mutants in bovine cells. This repression can be almost completely trans-complemented by the most abundant miRNA BF2-5p having the best scores for predicted and validated BFV miRNA target genes. Deletion of the miRNA cassette does not grossly affect particle release and overall particle composition.
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发表时间: 2015-11-11
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影响因子: --
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