2p8x
From Proteopedia
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'''Fitted structure of ADPR-eEF2 in the 80S:ADPR-eEF2:GDPNP cryo-EM reconstruction''' | '''Fitted structure of ADPR-eEF2 in the 80S:ADPR-eEF2:GDPNP cryo-EM reconstruction''' | ||
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[[Category: Taylor, D J.]] | [[Category: Taylor, D J.]] | ||
[[Category: 80s ribosome]] | [[Category: 80s ribosome]] | ||
| - | [[Category: | + | [[Category: Elongation]] |
| - | [[Category: | + | [[Category: Gtpase]] |
| - | [[Category: | + | [[Category: Translocation]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 12:37:43 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 09:37, 4 May 2008
Fitted structure of ADPR-eEF2 in the 80S:ADPR-eEF2:GDPNP cryo-EM reconstruction
Overview
On the basis of kinetic data on ribosome protein synthesis, the mechanical energy for translocation of the mRNA-tRNA complex is thought to be provided by GTP hydrolysis of an elongation factor (eEF2 in eukaryotes, EF-G in bacteria). We have obtained cryo-EM reconstructions of eukaryotic ribosomes complexed with ADP-ribosylated eEF2 (ADPR-eEF2), before and after GTP hydrolysis, providing a structural basis for analyzing the GTPase-coupled mechanism of translocation. Using the ADP-ribosyl group as a distinct marker, we observe conformational changes of ADPR-eEF2 that are due strictly to GTP hydrolysis. These movements are likely representative of native eEF2 motions in a physiological context and are sufficient to uncouple the mRNA-tRNA complex from two universally conserved bases in the ribosomal decoding center (A1492 and A1493 in Escherichia coli) during translocation. Interpretation of these data provides a detailed two-step model of translocation that begins with the eEF2/EF-G binding-induced ratcheting motion of the small ribosomal subunit. GTP hydrolysis then uncouples the mRNA-tRNA complex from the decoding center so translocation of the mRNA-tRNA moiety may be completed by a head rotation of the small subunit.
About this Structure
2P8X is a Protein complex structure of sequences from Saccharomyces cerevisiae and Thermus thermophilus. Full crystallographic information is available from OCA.
Reference
Structures of modified eEF2 80S ribosome complexes reveal the role of GTP hydrolysis in translocation., Taylor DJ, Nilsson J, Merrill AR, Andersen GR, Nissen P, Frank J, EMBO J. 2007 May 2;26(9):2421-31. Epub 2007 Apr 19. PMID:17446867 Page seeded by OCA on Sun May 4 12:37:43 2008
