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A novel role for Gemin5 in mRNA translation

Pacheco, A., Lopez De Quinto, Sonia ORCID:, Ramajo, J., Fernandez, N. and Martinez-Salas, E. 2009. A novel role for Gemin5 in mRNA translation. Nucleic Acids Research 37 (2) , pp. 582-590. 10.1093/nar/gkn979

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In eukaryotic cells translation initiation occurs through two alternative mechanisms, a cap-dependent operating in the majority of mRNAs, and a 5′-end-independent driven by internal ribosome entry site (IRES) elements, specific for a subset of mRNAs. IRES elements recruit the translation machinery to an internal position in the mRNA through a mechanism involving the IRES structure and several trans-acting factors. Here, we identified Gemin5 protein bound to the foot-and-mouth disease virus (FMDV) and hepatitis C virus (HCV) IRES using two independent approaches, riboproteomic analysis and immunoprecipitation of photocroslinked factors. Functional analysis performed in Gemin5 shRNA-depleted cells, or in in vitro translation reactions, revealed an unanticipated role of Gemin5 in translation control as a down-regulator of cap-dependent and IRES-driven translation initiation. Consistent with this, pull-down assays showed that Gemin5 forms part of two distinct complexes, a specific IRES-ribonucleoprotein complex and an IRES-independent protein complex containing eIF4E. Thus, beyond its role in snRNPs biogenesis, Gemin5 also functions as a modulator of translation activity

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > Q Science (General)
Publisher: Oxford University Press
ISSN: 0305-1048
Last Modified: 17 Oct 2022 10:44

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