1JQM image
Deposition Date 2001-08-07
Release Date 2001-09-07
Last Version Date 2024-02-07
Entry Detail
PDB ID:
1JQM
Keywords:
Title:
Fitting of L11 protein and elongation factor G (EF-G) in the cryo-em map of e. coli 70S ribosome bound with EF-G, GDP and fusidic acid
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Method Details:
Experimental Method:
Resolution:
18.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:50S Ribosomal protein L11
Gene (Uniprot):rplK
Chain IDs:A
Chain Length:139
Number of Molecules:1
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Molecule:Elongation Factor G
Gene (Uniprot):fusA
Chain IDs:B
Chain Length:691
Number of Molecules:1
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation

Abstact

L11 protein is located at the base of the L7/L12 stalk of the 50 S subunit of the Escherichia coli ribosome. Because of the flexible nature of the region, recent X-ray crystallographic studies of the 50 S subunit failed to locate the N-terminal domain of the protein. We have determined the position of the complete L11 protein by comparing a three-dimensional cryo-EM reconstruction of the 70 S ribosome, isolated from a mutant lacking ribosomal protein L11, with the three-dimensional map of the wild-type ribosome. Fitting of the X-ray coordinates of L11-23 S RNA complex and EF-G into the cryo-EM maps combined with molecular modeling, reveals that, following EF-G-dependent GTP hydrolysis, domain V of EF-G intrudes into the cleft between the 23 S ribosomal RNA and the N-terminal domain of L11 (where the antibiotic thiostrepton binds), causing the N-terminal domain to move and thereby inducing the formation of the arc-like connection with the G' domain of EF-G. The results provide a new insight into the mechanism of EF-G-dependent translocation.

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Primary Citation of related structures