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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Updated: Oct 7, 2025

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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Protein-coding tRNA sequences?

Juan Jimenez1

  • 1Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide/Consejo Superior de Investigaciones Científicas, Carretera de Utrera, km1, 41013 Sevilla, Spain.

Gene
|January 7, 2022
PubMed
Summary
This summary is machine-generated.

Transfer RNAs (tRNAs), essential for protein synthesis, unexpectedly yield peptides matching thousands of database entries. These tRNA-derived sequences, including domains within functional proteins, offer insights into gene evolution.

Keywords:
Spurious proteinstRNA-derived proteinstRNAs

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Area of Science:

  • Molecular Biology
  • Genomics
  • Evolutionary Biology

Background:

  • Transfer RNAs (tRNAs) are ancient, highly conserved molecules crucial for protein synthesis.
  • Canonical tRNAs function as amino acid carriers, not as protein-coding sequences.
  • The evolutionary origins and potential non-canonical functions of tRNAs are areas of ongoing research.

Purpose of the Study:

  • To investigate the potential for peptide generation from transfer RNA (tRNA) sequences.
  • To analyze the nature and origin of peptides derived from tRNAs.
  • To explore the evolutionary implications of tRNA-derived sequences in protein evolution.

Main Methods:

  • Virtual translation of transfer RNA (tRNA) sequences.
  • Bioinformatic analysis of derived peptide sequences against protein databases.
  • Phylogenetic analysis of identified tRNA-derived protein domains.

Main Results:

  • Virtual translation of tRNA sequences produced peptides matching thousands of protein entries.
  • Most tRNA-derived peptides were annotated as hypothetical, likely due to errors.
  • Functional protein domains encoded by tRNAs were identified within larger proteins.

Conclusions:

  • Transfer RNAs (tRNAs) can encode functional protein domains, challenging their canonical role.
  • These findings suggest a novel source for protein diversity and evolution.
  • Phylogenetic analysis of tRNA-derived domains may illuminate the evolution of protein-coding genes.