数字农科院2.0

Ribosomal Protein L13 Promotes Ires-Driven Translation Of Foot-And-Mouth Disease Virus In A Helicase Ddx3-Dependent Manner

文献类型： 外文期刊

作者： Han, SC; Sun, SQ; Li, PH; Liu, Q; Zhang, ZH; Dong, H; Sun, MM; Wu, WX; Wang, XJ; Guo, HC

作者机构：

关键词： Foot-And-Mouth Disease Virus; Internal Ribosome Entry Site; Ribosomal Protein L13; Dead Box Helicase 3; Eukaryotic Initiation Factor 3; Translation Initiation

期刊名称： JOURNAL OF VIROLOGY

ISSN： 0022-538X

年卷期： 2020 年 94 卷 2 期

页码：

收录情况： JCR（2021版）

摘要： Internal ribosome entry site (IRES)-driven translation is a common strategy among positive-sense, single-stranded RNA viruses for bypassing the host cell requirement of a 5' cap structure. In the current study, we identified the ribosomal protein L13 (RPL13) as a critical regulator of IRES-driven translation of foot-and-mouth disease virus (FMDV) but found that it is not essential for cellular global translation. RPL13 is also a determinant for translation and infection of Seneca Valley virus (SVV) and classical swine fever virus (CSFV), and this suggests that its function may also be conserved in unrelated IRES-containing viruses. We further showed that depletion of DEAD box helicase DDX3 disrupts binding of RPL13 to the FMDV IRES, whereas the reduction in RPL13 expression impairs the ability of DDX3 to promote IRES-driven translation directly. DDX3 cooperates with RPL13 to support the assembly of 80S ribosomes for optimal translation initiation of viral mRNA. Finally, we demonstrated that DDX3 affects the recruitment of the eukaryotic initiation factor eIF3 subunits e and j to the viral IRES. This work provides the first connection between DDX3 and eIF3e/j and recognition of the role of RPL13 in modulating viral IRES-dependent translation. This previously uncharacterized process may be involved in selective mRNA translation. IMPORTANCE Accumulating evidence has unveiled the roles of ribosomal proteins (RPs) belonging to the large 60S subunit in regulating selective translation of specific mRNAs. The translation speci?city of the large-subunit RPs in this process is thought provoking, given the role they play canonically in catalyzing peptide bond formation. Here, we have identified the ribosomal protein L13 (RPL13) as a critical regulator of IRES-driven translation during FMDV infection. Our study supports a model whereby the FMDV IRESs recruit helicase DDX3 recognizing RPL13 to facilitate IRES-driven translation, with the assistance of eIF3e and eIF3j. A better understanding of these specific interactions surrounding IRES-mediated translation initiation could have important implications for the selective translation of viral mRNA and thus for the development of effective prevention of viral infection.

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