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Structure and dynamics of the mammalian ribosomal pretranslocation complex

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons50116

Budkevich,  T.
Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons50431

Mielke,  T.
Imaging/Electron Microscopy (Head: Rudi Lurz/Thorsten Mielke), Scientific Service (Head: Manuela B. Urban), Max Planck Institute for Molecular Genetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons50444

Nierhaus,  K. H.
Ribosomes, Max Planck Institute for Molecular Genetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons50563

Spahn,  C. M.
Dept. of Vertebrate Genomics (Head: Hans Lehrach), Max Planck Institute for Molecular Genetics, Max Planck Society;

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Zitation

Budkevich, T., Giesebrecht, J., Altman, R. B., Munro, J. B., Mielke, T., Nierhaus, K. H., et al. (2011). Structure and dynamics of the mammalian ribosomal pretranslocation complex. Molecular Cell, 44(2), 214-24. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/22017870 http://pdn.sciencedirect.com/science?_ob=MiamiImageURL&_cid=272198&_user=28761&_pii=S109727651100757X&_check=y&_origin=article&_zone=toolbar&_coverDate=21-Oct-2011&view=c&originContentFamily=serial&wchp=dGLbVlV-zSkWA&md5=7955fd02fcf620b68260bfdefd7032ae/1-s2.0-S109727651100757X-main.pdf http://pdn.sciencedirect.com/science?_ob=MiamiImageURL&_cid=272198&_user=28761&_pii=S109727651100757X&_check=y&_origin=article&_zone=toolbar&_coverDate=21-Oct-2011&view=c&originContentFamily=serial&wchp=dGLzVlS-zSkzV&md5=7955fd02fcf620b68260bfdefd7032ae/1-s2.0-S109727651100757X-main.pdf.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-78EC-D
Zusammenfassung
Although the structural core of the ribosome is conserved in all kingdoms of life, eukaryotic ribosomes are significantly larger and more complex than their bacterial counterparts. The extent to which these differences influence the molecular mechanism of translation remains elusive. Multiparticle cryo-electron microscopy and single-molecule FRET investigations of the mammalian pretranslocation complex reveal spontaneous, large-scale conformational changes, including an intersubunit rotation of the ribosomal subunits. Through structurally related processes, tRNA substrates oscillate between classical and at least two distinct hybrid configurations facilitated by localized changes in their L-shaped fold. Hybrid states are favored within the mammalian complex. However, classical tRNA positions can be restored by tRNA binding to the E site or by the eukaryotic-specific antibiotic and translocation inhibitor cycloheximide. These findings reveal critical distinctions in the structural and energetic features of bacterial and mammalian ribosomes, providing a mechanistic basis for divergent translation regulation strategies and species-specific antibiotic action.