1qzc
Coordinates of S12, SH44, LH69 and SRL separately fitted into the cryo-EM map of EF-Tu ternary complex (GDP.Kirromycin) bound 70S ribosome
| |||||||
| Ligands: | , , , | ||||||
| Related: | 1FFK, 1IBM, 1QZA, 1QZB, 1QZD, 1R2W, 1R2X
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
OverviewOverview
Aminoacyl-tRNAs (aa-tRNAs) are delivered to the ribosome as part of the ternary complex of aa-tRNA, elongation factor Tu (EF-Tu) and GTP. Here, we present a cryo-electron microscopy (cryo-EM) study, at a resolution of approximately 9 A, showing that during the incorporation of the aa-tRNA into the 70S ribosome of Escherichia coli, the flexibility of aa-tRNA allows the initial codon recognition and its accommodation into the ribosomal A site. In addition, a conformational change observed in the GTPase-associated center (GAC) of the ribosomal 50S subunit may provide the mechanism by which the ribosome promotes a relative movement of the aa-tRNA with respect to EF-Tu. This relative rearrangement seems to facilitate codon recognition by the incoming aa-tRNA, and to provide the codon-anticodon recognition-dependent signal for the GTPase activity of EF-Tu. From these new findings we propose a mechanism that can explain the sequence of events during the decoding of mRNA on the ribosome.
About this StructureAbout this Structure
1QZC is a Single protein structure of sequence from Escherichia coli and Thermus thermophilus. Full crystallographic information is available from OCA.
ReferenceReference
Incorporation of aminoacyl-tRNA into the ribosome as seen by cryo-electron microscopy., Valle M, Zavialov A, Li W, Stagg SM, Sengupta J, Nielsen RC, Nissen P, Harvey SC, Ehrenberg M, Frank J, Nat Struct Biol. 2003 Nov;10(11):899-906. Epub 2003 Oct 19. PMID:14566331
Page seeded by OCA on Sun Mar 30 23:21:07 2008