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Title: Ribosome Structure Reveals Preservation of Active Sites in the Presence of a P-Site Wobble Mismatch

Journal Article · · Structure
 [1];  [1]
  1. Univ. of Massachusetts Medical School, Worcester, MA (United States)

Translation initiation in the P site occasionally occurs at atypical (non-AUG) start codons, including those forming a mismatch in the third (wobble) position. During elongation, however, a pyrimidine-pyrimidine wobble mismatch may trigger a translation quality-control mechanism, whereby the P-site mismatch is thought to perturb the downstream A-site codon or the decoding center, thereby reducing translation fidelity and inducing termination of aberrant translation. We report a crystal structure of the 70S initiation complex containing an AUC codon in the ribosomal P site. Remarkably, the ribosome stabilizes the mismatched codon-anticodon helix, arranging a normally disruptive cytosine-cytosine pair into a Watson-Crick-like conformation. Here, the translation-competent conformations of the tRNA, mRNA, and decoding center suggest that a P-site wobble-position mismatch in the 70S initiation complex does not pre-arrange the mRNA or decoding center to favor subsequent miscoding events.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Institutes of Health (NIH)
Grant/Contract Number:
GM106105; GM107465
OSTI ID:
1252757
Journal Information:
Structure, Vol. 23, Issue 11; ISSN 0969-2126
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (3)

Systematic analysis of the PTEN 5′ leader identifies a major AUU initiated proteoform journal May 2016
An antimicrobial peptide that inhibits translation by trapping release factors on the ribosome journal July 2017
Precision targeted ruthenium(ii) luminophores; highly effective probes for cell imaging by stimulated emission depletion (STED) microscopy journal January 2016

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