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Science. 2009 Aug 21;325(5943):966-70. doi: 10.1126/science.1175800.

Formation of the first peptide bond: the structure of EF-P bound to the 70S ribosome.

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  • 1Department of Molecular Biophysics, Yale University, New Haven, CT 06520, USA.

Abstract

Elongation factor P (EF-P) is an essential protein that stimulates the formation of the first peptide bond in protein synthesis. Here we report the crystal structure of EF-P bound to the Thermus thermophilus 70S ribosome along with the initiator transfer RNA N-formyl-methionyl-tRNA(i) (fMet-tRNA(i)(fMet)) and a short piece of messenger RNA (mRNA) at a resolution of 3.5 angstroms. EF-P binds to a site located between the binding site for the peptidyl tRNA (P site) and the exiting tRNA (E site). It spans both ribosomal subunits with its amino-terminal domain positioned adjacent to the aminoacyl acceptor stem and its carboxyl-terminal domain positioned next to the anticodon stem-loop of the P site-bound initiator tRNA. Domain II of EF-P interacts with the ribosomal protein L1, which results in the largest movement of the L1 stalk that has been observed in the absence of ratcheting of the ribosomal subunits. EF-P facilitates the proper positioning of the fMet-tRNA(i)(fMet) for the formation of the first peptide bond during translation initiation.

Comment in

PMID:
19696344
[PubMed - indexed for MEDLINE]
PMCID:
PMC3296453
Free PMC Article

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