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Ribozyme-catalyzed tRNA aminoacylation.

N Lee1, Y Bessho, K Wei

  • 1Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA.

Nature Structural Biology
|January 14, 2000
PubMed
Summary

This study demonstrates a bifunctional ribozyme capable of specific aminoacylation of tRNA, supporting the RNA world hypothesis. This ribozyme

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Area of Science:

  • Origin of Life Studies
  • Molecular Biology
  • Biochemistry

Background:

  • The RNA world hypothesis posits that RNA preceded DNA and proteins in early life.
  • Aminoacyl-tRNA synthetases are crucial for protein synthesis, linking amino acids to tRNA.
  • Understanding the evolution of these synthetases is key to deciphering early translation.

Purpose of the Study:

  • To investigate the potential role of ribozymes in early coded protein synthesis.
  • To characterize a novel bifunctional ribozyme with aminoacylation capabilities.

Main Methods:

  • Directed in vitro evolution to generate ribozymes.
  • Biochemical assays to assess substrate recognition and aminoacylation activity.
  • Structural analysis to understand ribozyme conformation and domain interaction.

Main Results:

  • A bifunctional ribozyme was evolved that specifically recognizes glutaminyl-tRNA.
  • The ribozyme catalyzes aminoacylation of tRNA via a covalent intermediate.
  • Distinct catalytic domains and a pseudoknotted structure enable sequential reactions.

Conclusions:

  • This ribozyme provides a model for early aminoacyl-tRNA synthetase ribozymes.
  • The findings support the RNA world hypothesis and the evolution of the genetic code.
  • RNA-directed translation likely evolved from ribozyme-catalyzed acyl-transfer reactions.
Keywords:
Non-programmatic

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