ArticleRNA biology2016
EF4 reveals the energy barrier for tRNA back-translocation in the peptidyl transferase center.
Article in RNA biology, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In the translating ribosomal complex, transfer RNA (tRNA) is stabilized in the ribosome by its anticodon stem-loop (ASL) and 3'-CCA end through base-pairing interactions with mRNA codon on the small subunit and rRNA in the peptidyl transferase center (PTC) of large subunit, respectively.Elongation factor 4 (EF4), a highly conserved translational GTPase, has been identified to trigger back-translocation. Early this year, we reported high resolution cryo-EM structures of EF4 in complex with Escherichia coli 70S ribosome in pre- and post-translocational states with direct observations that EF4 disrupts the base pairs between the 3'-end of peptidyl-tRNA and the P-loop of rRNA in PTC. Here, we focus on the novel molecular mechanism how EF4 catalyzes back-translocation, and discuss the common and specific energy barriers for forward- and back-translocation.
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