Universal scanning-free initiation of eukaryote protein translation-a new normal.

A unique feature of eukaryote initiation of protein translation is a so-called scanning of 5'-untranslated region (5'-UTR) by a ribosome initiation complex to enable bound Met-tRNAi access to the initiation codon located further downstream. Here, we propose a universal scanning-free translation initiation model that is independent of 5'-UTR length and applicable to both 5'-m7G (capped) and uncapped mRNAs.