1887

Abstract

Translation directed by the poliovirus (PV) or encephalomyocarditis virus (EMCV) internal ribosome entry site (IRES) is very inefficient when expressed from Sindbis virus (SV) replicons. This inhibition can be rescued by co-expression of PV 2A protease (2A). Inhibition correlates with the extensive phosphorylation of eukaryotic initiation factor (eIF) 2α induced by SV replication. Confirmation that PV or EMCV IRES-driven translation can function when eIF2α is not phosphorylated was obtained in dsRNA-activated protein kinase knockout mouse embryonic fibroblasts (PKR MEFs), where SV replication cannot induce eIF2α phosphorylation, and in variant S51A MEFs that express an unphosphorylatable eIF2α. In these cells, PV or EMCV IRES-dependent translation operated more efficiently than in wild-type MEFs. However, this translation was potently blocked when eIF2α was phosphorylated by the addition of thapsigargin to PKR MEFs. In addition, when wild-type eIF2α was expressed in S51A MEFs or PKR was expressed in PKR MEFs, PV IRES-dependent translation decreased. In both cases, the decrease in PV IRES-dependent translation correlated with the phosphorylation of eIF2α. Notably, PV 2A expression rescued PV IRES-driven translation in thapsigargin-treated PKR MEFs. Taken together, these results demonstrated that PV IRES-driven translation can take place from SV replicons if eIF2α remains unphosphorylated. Remarkably, PV IRES-dependent translation was fully functional in this system when PV 2A was present, even if eIF2α was phosphorylated.

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2013-04-01
2019-10-14
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