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A novel ribozyme with ester transferase activity

A Jenne1, M Famulok

  • 1Institut für Biochemie der LMU München-Genzentrum, Germany.

Chemistry & Biology
|February 28, 1998
PubMed
Summary
This summary is machine-generated.

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Researchers discovered a novel ribozyme with ester transferase activity, catalyzing amino acid transfer. This finding supports the RNA world hypothesis and offers insights into the evolution of translation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Astrobiology

Background:

  • The 'RNA world' hypothesis posits early life relied on ribozymes for catalysis.
  • Ribozymes catalyzing acyl, amide, or peptide bonds are key to linking RNA and protein worlds.
  • Aminoacylated RNAs are central to modern translation, suggesting RNA-catalyzed aminoacyl transfer was crucial for its evolution.

Purpose of the Study:

  • To isolate and characterize a novel ribozyme with aminoacyl transferase activity.
  • To investigate the evolutionary link between RNA catalysis and the origins of translation.

Main Methods:

  • Isolation and characterization of a novel ribozyme.
  • Determination of the aminoacylation site (internal 2'-OH of cytosine).
  • Engineering the ribozyme for intermolecular catalysis and quantifying the reverse reaction.

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Main Results:

  • A novel ribozyme was isolated, catalyzing amino acid ester transfer to itself at an internal 2'-OH group.
  • The reaction requires Mg2+ and is competitively inhibited by AMP, indicating a specific binding pocket.
  • The ribozyme was engineered to aminoacylate an external oligonucleotide, expanding its catalytic scope.

Conclusions:

  • The isolated ribozyme exhibits ester transferase activity, expanding the known functions of catalytic RNA.
  • This ribozyme's activity, transferring amino acids to an internal RNA position, supports its role as an evolutionary precursor to ribosomal RNA.
  • The findings provide evidence for RNA's role in early biochemical processes and the development of the translation apparatus.