Mikel Valle / Andrey Zavialov / Jayati Sengupta / Urmila Rawat / Måns Ehrenberg / Joachim Frank /
PubMed Abstract
During the ribosomal translocation, the binding of elongation factor G (EF-G) to the pretranslocational ribosome leads to a ratchet-like rotation of the 30S subunit relative to the 50S subunit in the ...During the ribosomal translocation, the binding of elongation factor G (EF-G) to the pretranslocational ribosome leads to a ratchet-like rotation of the 30S subunit relative to the 50S subunit in the direction of the mRNA movement. By means of cryo-electron microscopy we observe that this rotation is accompanied by a 20 A movement of the L1 stalk of the 50S subunit, implying that this region is involved in the translocation of deacylated tRNAs from the P to the E site. These ribosomal motions can occur only when the P-site tRNA is deacylated. Prior to peptidyl-transfer to the A-site tRNA or peptide removal, the presence of the charged P-site tRNA locks the ribosome and prohibits both of these motions.
EMDB-1362: Locking and unlocking of ribosomal motions. PDB-1pn6: Domain-wise fitting of the crystal structure of T.thermophilus EF-G into the low resolution map of the release complex.Puromycin.EFG.GDPNP of E.coli 70S ribosome. PDB-1pn7: Coordinates of S12, L11 proteins and P-tRNA, from the 70S X-ray structure aligned to the 70S Cryo-EM map of E.coli ribosome PDB-1pn8: Coordinates of S12, L11 proteins and E-site tRNA from 70S crystal structure separately fitted into the Cryo-EM map of E.coli 70S.EF-G.GDPNP complex. The atomic coordinates originally from the E-site tRNA were fitted in the position of the hybrid P/E-site tRNA. Method: EM (single particle) / Resolution: 12.5 Å
EMDB-1363: Locking and unlocking of ribosomal motions. PDB-1pn6: Domain-wise fitting of the crystal structure of T.thermophilus EF-G into the low resolution map of the release complex.Puromycin.EFG.GDPNP of E.coli 70S ribosome. PDB-1pn7: Coordinates of S12, L11 proteins and P-tRNA, from the 70S X-ray structure aligned to the 70S Cryo-EM map of E.coli ribosome PDB-1pn8: Coordinates of S12, L11 proteins and E-site tRNA from 70S crystal structure separately fitted into the Cryo-EM map of E.coli 70S.EF-G.GDPNP complex. The atomic coordinates originally from the E-site tRNA were fitted in the position of the hybrid P/E-site tRNA. Method: EM (single particle) / Resolution: 10.9 Å
EMDB-1364: Locking and unlocking of ribosomal motions. PDB-1pn6: Domain-wise fitting of the crystal structure of T.thermophilus EF-G into the low resolution map of the release complex.Puromycin.EFG.GDPNP of E.coli 70S ribosome. PDB-1pn7: Coordinates of S12, L11 proteins and P-tRNA, from the 70S X-ray structure aligned to the 70S Cryo-EM map of E.coli ribosome PDB-1pn8: Coordinates of S12, L11 proteins and E-site tRNA from 70S crystal structure separately fitted into the Cryo-EM map of E.coli 70S.EF-G.GDPNP complex. The atomic coordinates originally from the E-site tRNA were fitted in the position of the hybrid P/E-site tRNA. Method: EM (single particle) / Resolution: 10.9 Å
EMDB-1365: Locking and unlocking of ribosomal motions. PDB-1pn6: Domain-wise fitting of the crystal structure of T.thermophilus EF-G into the low resolution map of the release complex.Puromycin.EFG.GDPNP of E.coli 70S ribosome. PDB-1pn7: Coordinates of S12, L11 proteins and P-tRNA, from the 70S X-ray structure aligned to the 70S Cryo-EM map of E.coli ribosome PDB-1pn8: Coordinates of S12, L11 proteins and E-site tRNA from 70S crystal structure separately fitted into the Cryo-EM map of E.coli 70S.EF-G.GDPNP complex. The atomic coordinates originally from the E-site tRNA were fitted in the position of the hybrid P/E-site tRNA. Method: EM (single particle) / Resolution: 11.75 Å
EMDB-1366: Locking and unlocking of ribosomal motions. PDB-1pn6: Domain-wise fitting of the crystal structure of T.thermophilus EF-G into the low resolution map of the release complex.Puromycin.EFG.GDPNP of E.coli 70S ribosome. PDB-1pn7: Coordinates of S12, L11 proteins and P-tRNA, from the 70S X-ray structure aligned to the 70S Cryo-EM map of E.coli ribosome PDB-1pn8: Coordinates of S12, L11 proteins and E-site tRNA from 70S crystal structure separately fitted into the Cryo-EM map of E.coli 70S.EF-G.GDPNP complex. The atomic coordinates originally from the E-site tRNA were fitted in the position of the hybrid P/E-site tRNA. Method: EM (single particle) / Resolution: 12.8 Å
Source
Escherichia coli (E. coli)
synthetic construct (others)
thermus thermophilus (bacteria)
thermotoga maritima (bacteria)
Keywords
BIOSYNTHETIC PROTEIN / Elongation Factor-G / E.coli 70S ribosome / Post-termination complex / Fitting of crystal structure / Cryo-EM / RNA binding protein/RNA / ribosomal protein / tRNA binding protein / tRNA / RNA binding protein-RNA COMPLEX
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Keywords
BIOSYNTHETIC PROTEIN / Elongation Factor-G / E.coli 70S ribosome / Post-termination complex / Fitting of crystal structure / 
