Localization of L11 protein on the ribosome and elucidation of its involvement in EF-G-dependent translocation.
J Mol Biol
; 311(4): 777-87, 2001 Aug 24.
Article
in En
| MEDLINE
| ID: mdl-11518530
ABSTRACT
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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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ribosomal Proteins
/
Ribosomes
/
Cryoelectron Microscopy
/
Peptide Elongation Factor G
/
Escherichia coli Proteins
/
Escherichia coli
Type of study:
Prognostic_studies
Language:
En
Journal:
J Mol Biol
Year:
2001
Document type:
Article
Affiliation country:
United States