1887

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Volume 90, Issue 3

Poly(A)-binding protein binds to the non-polyadenylated 3′ untranslated region of dengue virus and modulates translation efficiency Free

Abstract

Poly(A)-binding protein (PABP) is a key player in mRNA circularization and translation initiation of polyadenylated mRNAs. It simultaneously binds the 3′ poly(A) tail of an mRNA and eukaryotic initiation factor 4G (eIF4G), which forms part of the translation initiation complex assembling at the 5′end, thus circularizing the RNA molecule and enhancing translation initiation. Here, we report the binding of PABP to the non-polyadenylated 3′end of dengue virus (DENV) RNA. PABP binds the DENV 3′ untranslated region (3′UTR) internally, upstream of the conserved 3′stem–loop near the two dumb-bell structures, and can be displaced by poly(A) RNA. The PABP-specific translation inhibitor PABP-interacting protein 2 (Paip2) interferes with the DENV 3′UTR–PABP interaction, and translation of DENV reporter RNAs in baby hamster kidney cell extracts is inhibited by Paip2 in a dose-dependent manner. Our findings show an expanded translation mechanism for PABP, binding to a viral RNA lacking a terminal poly(A) tail.

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2009-03-01
2023-12-07
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Poly(A)-binding protein binds to the non-polyadenylated 3′ untranslated region of dengue virus and modulates translation efficiency
J. Gen. Virol. 90, 687 (2009); https://doi.org/10.1099/vir.0.007021-0
/content/journal/jgv/10.1099/vir.0.007021-0
/content/journal/jgv/10.1099/vir.0.007021-0
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