Visualization of translation termination intermediates trapped by the Apidaecin 137 peptide during RF3-mediated recycling of RF1

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Authors	GRAF M. HUTER P. MARACCI C. PETEREK Miroslav RODNINA M.V. WILSON D.N.
Year of publication	2018
Type	Article in Periodical
Magazine / Source	Nature Communications
MU Faculty or unit	Central European Institute of Technology
Citation
Doi	http://dx.doi.org/10.1038/s41467-018-05465-1
Keywords	RELEASE FACTOR RF3; ELONGATION-FACTOR-G; STOP CODON RECOGNITION; ESCHERICHIA-COLI; CRYSTAL-STRUCTURE; ELECTRON CRYOMICROSCOPY; GTPASE ACTIVATION; GGQ MOTIF; CRYO-EM; EF-G
Description	During translation termination in bacteria, the release factors RF1 and RF2 are recycled from the ribosome by RF3. While high-resolution structures of the individual termination factors on the ribosome exist, direct structural insight into how RF3 mediates dissociation of the decoding RFs has been lacking. Here we have used the Apidaecin 137 peptide to trap RF1 together with RF3 on the ribosome and visualize an ensemble of termination intermediates using cryo-electron microscopy. Binding of RF3 to the ribosome induces small subunit (SSU) rotation and swivelling of the head, yielding intermediate states with shifted P-site tRNAs and RF1 conformations. RF3 does not directly eject RF1 from the ribosome, but rather induces full rotation of the SSU that indirectly dislodges RF1 from its binding site. SSU rotation is coupled to the accommodation of the GTPase domain of RF3 on the large subunit (LSU), thereby promoting GTP hydrolysis and dissociation of RF3 from the ribosome.
Related projects:	Czech Infrastructure for Integrative Structural Biology