|
|
| Line 9: |
Line 9: |
| == Function == | | == Function == |
| [https://www.uniprot.org/uniprot/RL11_ECOLI RL11_ECOLI] This protein binds directly to 23S ribosomal RNA. Forms the L11 stalk, which is mobile in the ribosome, indicating its contribution to the activity of initiation, elongation and release factors.[HAMAP-Rule:MF_00736_B] | | [https://www.uniprot.org/uniprot/RL11_ECOLI RL11_ECOLI] This protein binds directly to 23S ribosomal RNA. Forms the L11 stalk, which is mobile in the ribosome, indicating its contribution to the activity of initiation, elongation and release factors.[HAMAP-Rule:MF_00736_B] |
| <div style="background-color:#fffaf0;">
| |
| == Publication Abstract from PubMed ==
| |
| The ribosome-recycling factor (RRF) and elongation factor-G (EF-G) disassemble the 70S post-termination complex (PoTC) into mRNA, tRNA, and two ribosomal subunits. We have determined cryo-electron microscopic structures of the PoTC.RRF complex, with and without EF-G. We find that domain II of RRF initially interacts with universally conserved residues of the 23S rRNA helices 43 and 95, and protein L11 within the 50S ribosomal subunit. Upon EF-G binding, both RRF and tRNA are driven towards the tRNA-exit (E) site, with a large rotational movement of domain II of RRF towards the 30S ribosomal subunit. During this intermediate step of the recycling process, domain II of RRF and domain IV of EF-G adopt hitherto unknown conformations. Furthermore, binding of EF-G to the PoTC.RRF complex reverts the ribosome from ratcheted to unratcheted state. These results suggest that (i) the ribosomal intersubunit reorganizations upon RRF binding and subsequent EF-G binding could be instrumental in destabilizing the PoTC and (ii) the modes of action of EF-G during tRNA translocation and ribosome-recycling steps are markedly different.
| |
|
| |
| Structural insights into initial and intermediate steps of the ribosome-recycling process.,Yokoyama T, Shaikh TR, Iwakura N, Kaji H, Kaji A, Agrawal RK EMBO J. 2012 Mar 2;31(7):1836-46. doi: 10.1038/emboj.2012.22. PMID:22388519<ref>PMID:22388519</ref>
| |
|
| |
| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| |
| </div>
| |
| <div class="pdbe-citations 3j0d" style="background-color:#fffaf0;"></div>
| |
|
| |
|
| ==See Also== | | ==See Also== |
| Line 24: |
Line 15: |
| *[[Ribosome 3D structures|Ribosome 3D structures]] | | *[[Ribosome 3D structures|Ribosome 3D structures]] |
| *[[Ribosome recycling factor|Ribosome recycling factor]] | | *[[Ribosome recycling factor|Ribosome recycling factor]] |
| == References ==
| |
| <references/>
| |
| __TOC__ | | __TOC__ |
| </SX> | | </SX> |
