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Open access
Nature Structural and Molecular Biology, volume 21, issue 9, pages 787-793

A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome

Publication typeJournal Article
Publication date2014-08-17
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor16.8
ISSN15459993, 15459985
PubMed ID:  25132179
Molecular Biology
Structural Biology
Abstract
During peptide-bond formation on the ribosome, the α-amine of an aminoacyl-tRNA attacks the ester carbonyl carbon of a peptidyl-tRNA to yield a peptide lengthened by one amino acid. Although the ribosome's contribution to catalysis is predominantly entropic, the lack of high-resolution structural data for the complete active site in complex with full-length ligands has made it difficult to assess how the ribosome might influence the pathway of the reaction. Here, we present crystal structures of preattack and postcatalysis complexes of the Thermus thermophilus 70S ribosome at ~2.6-Å resolution. These structures reveal a network of hydrogen bonds along which proton transfer could take place to ensure the concerted, rate-limiting formation of a tetrahedral intermediate. We propose that, unlike earlier models, the ribosome and the A-site tRNA facilitate the deprotonation of the nucleophile through the activation of a water molecule.

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GOST |
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GOST Copy
Polikanov Y. S. et al. A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome // Nature Structural and Molecular Biology. 2014. Vol. 21. No. 9. pp. 787-793.
GOST all authors (up to 50) Copy
Polikanov Y. S., Steitz T. A., Innis C. A. A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome // Nature Structural and Molecular Biology. 2014. Vol. 21. No. 9. pp. 787-793.
RIS |
Cite this
RIS Copy
TY - JOUR
DO - 10.1038/nsmb.2871
UR - https://doi.org/10.1038%2Fnsmb.2871
TI - A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome
T2 - Nature Structural and Molecular Biology
AU - Polikanov, Yury S.
AU - Steitz, Thomas A.
AU - Innis, C Axel
PY - 2014
DA - 2014/08/17 00:00:00
PB - Springer Nature
SP - 787-793
IS - 9
VL - 21
PMID - 25132179
SN - 1545-9993
SN - 1545-9985
ER -
BibTex |
Cite this
BibTex Copy
@article{2014_Polikanov,
author = {Yury S. Polikanov and Thomas A. Steitz and C Axel Innis},
title = {A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome},
journal = {Nature Structural and Molecular Biology},
year = {2014},
volume = {21},
publisher = {Springer Nature},
month = {aug},
url = {https://doi.org/10.1038%2Fnsmb.2871},
number = {9},
pages = {787--793},
doi = {10.1038/nsmb.2871}
}
MLA
Cite this
MLA Copy
Polikanov, Yury S., et al. “A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome.” Nature Structural and Molecular Biology, vol. 21, no. 9, Aug. 2014, pp. 787-793. https://doi.org/10.1038%2Fnsmb.2871.
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