A structural inventory of native ribosomal ABCE1-43S pre-initiation complexes

Kratzat, Hanna; Mackens-Kiani, Timur; Ameismeier, Michael; Potocnjak, Mia; Cheng, Jingdong; Dacheux, Estelle; Namane, Abdelkader; Berninghausen, Otto; Herzog, Franz; Fromont-Racine, Micheline; Becker, Thomas and Beckmann, Roland (2020): A structural inventory of native ribosomal ABCE1-43S pre-initiation complexes. In: EMBO Journal, Vol. 40, No. 1, e105179

Abstract

In eukaryotic translation, termination and ribosome recycling phases are linked to subsequent initiation of a new round of translation by persistence of several factors at ribosomal sub-complexes. These comprise/include the large eIF3 complex, eIF3j (Hcr1 in yeast) and the ATP-binding cassette protein ABCE1 (Rli1 in yeast). The ATPase is mainly active as a recycling factor, but it can remain bound to the dissociated 40S subunit until formation of the next 43S pre-initiation complexes. However, its functional role and native architectural context remains largely enigmatic. Here, we present an architectural inventory of native yeast and human ABCE1-containing pre-initiation complexes by cryo-EM. We found that ABCE1 was mostly associated with early 43S, but also with later 48S phases of initiation. It adopted a novel hybrid conformation of its nucleotide-binding domains, while interacting with the N-terminus of eIF3j. Further, eIF3j occupied the mRNA entry channel via its ultimate C-terminus providing a structural explanation for its antagonistic role with respect to mRNA binding. Overall, the native human samples provide a near-complete molecular picture of the architecture and sophisticated interaction network of the 43S-bound eIF3 complex and the eIF2 ternary complex containing the initiator tRNA.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Biochemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 0261-4189
• Language: English