Visualizing tmRNA Entry into a Stalled RibosomeValle, M., Gillet, R., Kaur, S., Henne, A., Ramakrishnan, V., Frank, J.
(2003) Science 300: 127-130
- PubMed: 12677067
- DOI: 10.1126/science.1081798
- PubMed Abstract:
- Cryo-EM reveals an active role for aminoacyl-tRNA in the accommodation process
Valle, M.,Sengupta, J.,Swami, N.K.,Grassucci, R.A.,Burkhardt, N.,Nierhaus, K.H.,Agrawal, R.K.,Frank, J.
(2002) Embo J. 21: 3557
- Structure of small protein B: the protein component of the tmRNA SmpB system for ribosome rescue
Dong, G.,Nowakowski, J.,Hoffman, D.W.
(2002) Embo J. 21: 1845
- tmRDB (tmRNA database)
Knudsen, B.,Wower, J.,Zwieb, C.,Gorodkin, J.
(2001) Nucleic Acids Res. 29: 171
- Selection of tRNA by the Ribosome Requires a Transition from an Open to a Closed Form
Ogle, J.M.,Murphy Iv, F.V.,Tarry, M.J.,Ramakrishnan, V.
(2002) Cell 111: 721
- E. Coli Cysteinyl-tRNA and T. Aquaticus Elongation Factor Ef-Tu: GTP Ternary Complex
Nissen, P.,Kjeldgaard, M.,Thirup, S.,Nyborg, J.
(1999) Structure Fold.Des. 7: 143
Bacterial ribosomes stalled on defective messenger RNAs (mRNAs) are rescued by tmRNA, an approximately 300-nucleotide-long molecule that functions as both transfer RNA (tRNA) and mRNA. Translation then switches from the defective message to a short o ...
Bacterial ribosomes stalled on defective messenger RNAs (mRNAs) are rescued by tmRNA, an approximately 300-nucleotide-long molecule that functions as both transfer RNA (tRNA) and mRNA. Translation then switches from the defective message to a short open reading frame on tmRNA that tags the defective nascent peptide chain for degradation. However, the mechanism by which tmRNA can enter and move through the ribosome is unknown. We present a cryo-electron microscopy study at approximately 13 to 15 angstroms of the entry of tmRNA into the ribosome. The structure reveals how tmRNA could move through the ribosome despite its complicated topology and also suggests roles for proteins S1 and SmpB in the function of tmRNA.
Howard Hughes Medical Institute, Wadsworth Center, Health Research, Inc., Empire State Plaza, Albany, NY 12201-0509, USA.