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Evolution of E. coli tRNA(Trp).

M P Staves1, D P Bloch, J C Lacey

  • 1Department of Botany, University of Texas, Austin 78713.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|January 1, 1988
PubMed
Summary
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This study investigates the late evolutionary assignment of anticodons in transfer RNAs (tRNAs). Evidence suggests the tryptophan (Trp) anticodon evolved later, possibly from glycine (Gly) or arginine (Arg) tRNAs.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Amino acid hydrophobicity correlates with most anticodon assignments.
  • Four anticodon assignments (Trp, Tyr, Ile, Ser) did not correlate with hydrophobicity.
  • These uncorrelated assignments are hypothesized to be later evolutionary events.

Purpose of the Study:

  • To examine the evolutionary origins of Escherichia coli tRNA(Trp).
  • To investigate the hypothesis of late anticodon assignment in tRNA evolution.
  • To identify potential evolutionary precursors for tRNA(Trp).

Main Methods:

  • Comparative sequence homology analysis of E. coli tRNAs.
  • Examining evolutionary relationships between tRNA(Trp) and other E. coli tRNAs.
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-20NASA Program ExobiologyNon-NASA Center

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  • Evaluating sequence similarities to infer evolutionary origins.

    • Main Results:

    • High sequence homology was observed between E. coli tRNA(Ile) and tRNA(Val)/tRNA(Lys).
    • E. coli tRNA(Tyr) showed homology to E. coli 5s rRNA or a common precursor.
    • Sequence data suggest a possible evolutionary link between tRNA(Trp) and E. coli tRNA(Gly) or tRNA(Arg).

    Conclusions:

    • The findings support the hypothesis that anticodon assignments for certain amino acids, including Trp, occurred late in evolutionary history.
    • The evolutionary trajectory of tRNA(Trp) may involve derivation from tRNA(Gly) or tRNA(Arg).
    • This late evolutionary assignment explains the lack of correlation with hydrophobicity rankings.