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Proofreading neutralizes potential error hotspots in genetic code translation by transfer RNAs.

Jingji Zhang1, Ka-Weng Ieong1, Harriet Mellenius1

  • 1Department of Cell and Molecular Biology, Uppsala University, Uppsala 75124, Sweden.

RNA (New York, N.Y.)
|April 20, 2016
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Summary

Protein synthesis accuracy relies on initial and proofreading selection of aminoacyl-tRNAs. This study reveals how proofreading neutralizes errors, ensuring fidelity in Escherichia coli protein production.

Keywords:
accuracyerror hotspotsgenetic codeproofreadingribosometRNA selection

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Ribosomes ensure accurate protein synthesis through initial and proofreading selection of aminoacyl-tRNAs.
  • In vitro studies indicated potential error hotspots for tRNA(His) and tRNA(Glu) near-cognate codon misreading, but in vivo data suggested error neutralization.
  • The precise role of proofreading in mitigating these specific errors required further investigation.

Purpose of the Study:

  • To investigate the role of tRNA proofreading in reducing protein synthesis errors.
  • To calibrate a cell-free system's accuracy to in vivo levels in Escherichia coli by adjusting magnesium ion concentration.
  • To determine how proofreading and initial selection mechanisms interact under varying accuracy conditions.

Main Methods:

  • Utilized a calibrated cell-free system mimicking Escherichia coli's in vivo accuracy.
  • Varied magnesium ion concentration to modulate the fidelity of aminoacyl-tRNA selection.
  • Analyzed the impact of tRNA identity, codon mismatch type, and mismatch position on selection accuracy.

Main Results:

  • Total accuracy of tRNA selection varied across five orders of magnitude, influenced by tRNA type, mismatch, and codon position.
  • Proofreading and initial selection were positively correlated when initial selection accuracy was high.
  • At low initial selection accuracy, proofreading and initial selection were uncorrelated, suggesting hyperactivation of proofreading.

Conclusions:

  • Hyperactivated proofreading serves as a critical mechanism to counteract potentially high error rates during initial aminoacyl-tRNA selection.
  • The interplay between initial selection and proofreading is crucial for maintaining high fidelity in protein synthesis.
  • This study provides insights into the sophisticated error-correction strategies employed by the ribosome in vivo.