Function of the ribosomal E-site: A mutagenesis study

Petr V. Sergiev, Dmitry V. Lesnyak, Sergey V. Kiparisov, Dmitry E. Burakovsky, Andrei A. Leonov, Alexey A. Bogdanov, Richard Brimacombe, Olga A. Dontsova

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Ribosomes synthesize proteins according to the information encoded in mRNA. During this process, both the incoming amino acid and the nascent peptide are bound to tRNA molecules. Three binding sites for tRNA in the ribosome are known: the A-site for aminoacyl-tRNA, the P-site for peptidyl-tRNA and the E-site for the deacylated tRNA leaving the ribosome. Here, we present a study of Escherichia coli ribosomes with the E-site binding destabilized by mutation C2394G of the 23S rRNA. Expression of the mutant 23S rRNA in vivo caused increased frameshifting and stop codon readthrough. The progression of these ribosomes through the ribosomal elongation cycle in vitro reveals ejection of deacylated tRNA during the translocation step or shortly after. E-site compromised ribosomes can undergo translocation, although in some cases it is less efficient and results in a frameshift. The mutation affects formation of the P/E hybrid site and leads to a loss of stimulation of the multiple turnover GTPase activity of EF-G by deacylated tRNA bound to the ribosome.

Original languageEnglish
Pages (from-to)6048-6056
Number of pages9
JournalNucleic Acids Research
Volume33
Issue number18
DOIs
Publication statusPublished - 2005
Externally publishedYes

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