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ms2i6A deficiency enhances proofreading in translation.

I Díaz1, M Ehrenberg

  • 1Department of Molecular Biology, University of Uppsala, Sweden.

Journal of Molecular Biology
|December 20, 1991
PubMed
Summary

The hypermodified base 2-methylthio-N6-isopentenyladenosine (ms2i6A) in tRNAs is crucial for accurate protein translation. Its absence increases errors during poly(U) translation, impacting codon recognition and proofreading.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The hypermodified nucleoside 2-methylthio-N6-isopentenyladenosine (ms2i6A) is frequently found at position 37 in transfer RNAs (tRNAs) that recognize codons initiating with uridine.
  • Understanding the role of such modifications in tRNA function is essential for comprehending the fidelity of protein synthesis.

Purpose of the Study:

  • To investigate the impact of ms2i6A deficiency on the accuracy of poly(U) translation in vitro.
  • To elucidate the specific mechanisms by which ms2i6A influences tRNA selection and proofreading during translation.

Main Methods:

  • In vitro translation assays using poly(U) as a template.
  • Analysis of tRNA selection and rejection rates using wild-type and ms2i6A-deficient tRNAs (tRNA4(Leu) and tRNA(Phe)).
  • Assessment of proofreading efficiency and initial selection steps in ribosomal selection.

Main Results:

  • ms2i6A deficiency in tRNA4(Leu) resulted in increased rejection by ribosomes, attributed to enhanced proofreading, while the initial selection step remained unaffected.
  • The presence of ms2i6A did not influence codon-anticodon interactions when aminoacyl-tRNA was in a ternary complex with EF-Tu and GTP on wild-type ribosomes.
  • Deficiency of ms2i6A in tRNA(Phe) led to elevated misreading of poly(U) codons in the presence of wild-type tRNA4(Leu).
  • Conversely, ms2i6A deficiency in tRNA4(Leu) decreased the error rate when competing with wild-type tRNA(Phe).

Conclusions:

  • The hypermodified base ms2i6A plays a significant role in ensuring translational accuracy, particularly in modulating proofreading efficiency rather than initial codon recognition.
  • ms2i6A influences the fidelity of translation by affecting the competition between cognate and near-cognate tRNAs, thereby minimizing errors during protein synthesis.

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