Journal
EMBO JOURNAL
Volume 27, Issue 24, Pages 3322-3331Publisher
WILEY
DOI: 10.1038/emboj.2008.243
Keywords
cryo-EM; decoding; EF-Tu; ribosome
Categories
Funding
- HHMI
- NIH [R01 GM55440, R37 GM29169, GM70768, R01 GM059425]
- Swedish Research Council
- Goran Gustafsson Stiftelse
- LEO foundation
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The accuracy of ribosomal translation is achieved by an initial selection and a proofreading step, mediated by EF-Tu, which forms a ternary complex with aminoacyl(aa)-tRNA. To study the binding modes of different aa-tRNAs, we compared cryo-EM maps of the kirromycin-stalled ribosome bound with ternary complexes containing Phe-tRNA(Phe), Trp-tRNA(Trp), or Leu-tRNA(LeuI). The three maps suggest a common binding manner of cognate aa-tRNAs in their specific binding with both the ribosome and EF-Tu. All three aa-tRNAs have the same 'loaded spring' conformation with a kink and twist between the D-stem and anticodon stem. The three complexes are similarly integrated in an interaction network, extending from the anticodon loop through h44 and protein S12 to the EF-Tu-binding CCA end of aa-tRNA, proposed to signal cognate codon-anticodon interaction to the GTPase centre and tune the accuracy of aa-tRNA selection.
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