Functional Dissection of Eukaryotic Initiation Factor 4F: the 4A Subunit and the Central Domain of the 4G Subunit Are Sufficient To Mediate Internal Entry of 43S Preinitiation Complexes

Abstract excerpt

Eukaryotic translation is initiated following binding of ribosomes either to the capped 5' end of an mRNA or to an internal ribosomal entry site (IRES) within its 5' nontranslated region. These processes are both mediated by eukaryotic initiation factor 4F (eIF4F), which consists of eIF4A (helicase), eIF4E (cap-binding protein), and eIF4G subunits. Here we present a functional analysis of eIF4F which defines the...

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