Nature, volume 438, issue 7067, pages 520-524

An induced-fit mechanism to promote peptide bond formation and exclude hydrolysis of peptidyl-tRNA

Martin Schmeing T 1
Huang Kevin S 1
Strobel Scott A. 1, 2
Steitz Thomas A. 1, 2, 3
1
 
Department of Molecular Biophysics and Biochemistry,
3
 
Howard Hughes Medical Institute, New Haven, USA
Publication typeJournal Article
Publication date2005-11-24
Journal: Nature
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor64.8
ISSN00280836, 14764687
Multidisciplinary
Abstract
Many kinds of enzymes need to protect their substrates from unwanted hydrolysis. Koshland proposed more than 40 years ago that these enzymes — he was looking specifically at hexokinase — adopt the catalytically competent conformation only when the appropriate substrates are bound and produce an ‘induced fit’ conformational change. Later work showed that it is indeed ‘induced fit’ that stops hexokinase from hydrolysing ATP when there is no glucose about. Structural studies of the large ribosomal subunit now show that a similar fit mechanism operates here too. This provides the answer to the long-standing question of how the nascent peptide in the P site of the ribosome avoids hydrolysis by peptidyl tRNA until the termination step of protein synthesis. This mechanism may well have been available to the ribozymes in an RNA world before proteins came on the scene. The large ribosomal subunit catalyses the reaction between the α-amino group of the aminoacyl-tRNA bound to the A site and the ester carbon of the peptidyl-tRNA bound to the P site1, while preventing the nucleophilic attack of water on the ester, which would lead to unprogrammed deacylation of the peptidyl-tRNA. Here we describe three new structures of the large ribosomal subunit of Haloarcula marismortui (Hma) complexed with peptidyl transferase substrate analogues that reveal an induced-fit mechanism in which substrates and active-site residues reposition to allow the peptidyl transferase reaction. Proper binding of an aminoacyl-tRNA analogue to the A site induces specific movements of 23S rRNA nucleotides 2618–2620 (Escherichia coli numbering 2583–2585) and 2541(2506), thereby reorienting the ester group of the peptidyl-tRNA and making it accessible for attack. In the absence of the appropriate A-site substrate, the peptidyl transferase centre positions the ester link of the peptidyl-tRNA in a conformation that precludes the catalysed nucleophilic attack by water. Protein release factors2 may also function, in part, by inducing an active-site rearrangement similar to that produced by the A-site aminoacyl-tRNA, allowing the carbonyl group and water to be positioned for hydrolysis.

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Martin Schmeing T. et al. An induced-fit mechanism to promote peptide bond formation and exclude hydrolysis of peptidyl-tRNA // Nature. 2005. Vol. 438. No. 7067. pp. 520-524.
GOST all authors (up to 50) Copy
Martin Schmeing T., Huang K. S., Strobel S. A., Steitz T. A. An induced-fit mechanism to promote peptide bond formation and exclude hydrolysis of peptidyl-tRNA // Nature. 2005. Vol. 438. No. 7067. pp. 520-524.
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RIS Copy
TY - JOUR
DO - 10.1038/nature04152
UR - https://doi.org/10.1038%2Fnature04152
TI - An induced-fit mechanism to promote peptide bond formation and exclude hydrolysis of peptidyl-tRNA
T2 - Nature
AU - Martin Schmeing, T
AU - Huang, Kevin S
AU - Strobel, Scott A.
AU - Steitz, Thomas A.
PY - 2005
DA - 2005/11/24 00:00:00
PB - Springer Nature
SP - 520-524
IS - 7067
VL - 438
SN - 0028-0836
SN - 1476-4687
ER -
BibTex |
Cite this
BibTex Copy
@article{2005_Martin Schmeing,
author = {T Martin Schmeing and Kevin S Huang and Scott A. Strobel and Thomas A. Steitz},
title = {An induced-fit mechanism to promote peptide bond formation and exclude hydrolysis of peptidyl-tRNA},
journal = {Nature},
year = {2005},
volume = {438},
publisher = {Springer Nature},
month = {nov},
url = {https://doi.org/10.1038%2Fnature04152},
number = {7067},
pages = {520--524},
doi = {10.1038/nature04152}
}
MLA
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MLA Copy
Martin Schmeing, T., et al. “An induced-fit mechanism to promote peptide bond formation and exclude hydrolysis of peptidyl-tRNA.” Nature, vol. 438, no. 7067, Nov. 2005, pp. 520-524. https://doi.org/10.1038%2Fnature04152.
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