Translation termination depends on the sequential ribosomal entry of eRF1 and 
eRF3.

Beissel , C.; Neumann, B.; Uhse, S.; Hampe , I.; Karki, P.; Krebber, H.

doi:10.1093/nar/gkz177

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Translation termination depends on the sequential ribosomal entry of eRF1 and eRF3.

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Karki, P.
Department of Physical Biochemistry, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Beissel, C., Neumann, B., Uhse, S., Hampe, I., Karki, P., & Krebber, H. (2019). Translation termination depends on the sequential ribosomal entry of eRF1 and eRF3. Nucleic Acids Research, 47(9), 4798-4813. doi:10.1093/nar/gkz177.

Cite as: https://hdl.handle.net/21.11116/0000-0004-49CE-3

Abstract

Translation termination requires eRF1 and eRF3 for polypeptide-and tRNA-release on stop codons. Additionally, Dbp5/DDX19 and Rli1/ABCE1 are required; however, their function in this process is currently unknown. Using a combination of in vivo and in vitro experiments, we show that they regulate a stepwise assembly of the termination complex. Rli1 and eRF3-GDP associate with the ribosome first. Subsequently, Dbp5-ATP delivers eRF1 to the stop codon and in this way prevents a premature access of eRF3. Dbp5 dissociates upon placing eRF1 through ATP-hydrolysis. This in turn enables eRF1 to contact eRF3, as the binding of Dbp5 and eRF3 to eRF1 is mutually exclusive. Defects in the Dbp5-guided eRF1 delivery lead to premature contact and premature dissociation of eRF1 and eRF3 from the ribosome and to subsequent stop codon readthrough. Thus, the stepwise Dbp5-controlled termination complex assembly is essential for regular translation termination events. Our data furthermore suggest a possible role of Dbp5/DDX19 in alternative translation termination events, such as during stress response or in developmental processes, which classifies the helicase as a potential drug target for nonsense suppression therapy to treat cancer and neurodegenerative diseases.