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Why base tautomerization does not cause errors in mRNA decoding on the ribosome.

Priyadarshi Satpati1, Johan Åqvist2

  • 1Department of Cell and Molecular Biology, Uppsala University, Biomedical Center, Box 596, SE-751 24 Uppsala, Sweden.

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Summary

Unusual guanine (G) tautomers in the genetic code explain ribosomal A-site structures, despite potential decoding errors. Molecular dynamics reveal G-enol is stable, but high tRNA binding free energies prevent frequent errors.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • The genetic code typically involves strict Watson-Crick base pairing, with wobble pairing at the third codon position.
  • Crystal structures show canonical geometry for near-cognate tRNAs with mismatches in the first two codon positions, questioning the pairing mechanisms.

Purpose of the Study:

  • To investigate the structural and energetic basis of G-U mismatches in the first two codon positions of the genetic code.
  • To reconcile crystallographic observations with the potential for decoding errors.

Main Methods:

  • Molecular dynamics free energy calculations were performed on ribosomal complexes.
  • Analysis focused on cognate and near-cognate transfer RNAs (tRNAs) in the ribosomal A-site.
  • Energetics of guanine (G) and uracil (U) tautomers in G-U mismatches were assessed.

Main Results:

  • The enol tautomer of guanine (G) is nearly isoenergetic with its ketone form in the first codon position and more stable in the second position.
  • Tautomerization of uracil (U) is energetically unfavorable.
  • The enol form of G explains observed crystallographic structures of near-cognate tRNAs.

Conclusions:

  • The enol tautomer of guanine (G) is stabilized in ribosomal complexes, explaining canonical geometries despite mismatches.
  • Despite the presence of unusual G tautomers, high tRNA binding free energies for near-cognate complexes prevent significant codon reading errors.