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Related Experiment Videos

A minihelix-loop RNA acts as a trans-aminoacylation catalyst.

N Lee1, H Suga

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

RNA (New York, N.Y.)
|July 17, 2001
PubMed
Summary

Researchers identified the minimal catalytic core of a ribozyme

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Area of Science:

  • Biochemistry
  • RNA catalysis
  • Origin of life

Background:

  • A bifunctional ribozyme previously reported catalyzes self-aminoacylation and acyl-transfer to tRNA.
  • This ribozyme possesses distinct glutamine-recognition (QR) and acyl-transferase (ATRib) catalytic domains.
  • It selectively binds biotinyl-glutamine and charges tRNA in trans.

Purpose of the Study:

  • To determine the essential catalytic core of the QR domain.
  • To understand the structural requirements for trans-aminoacylation by the ribozyme.

Main Methods:

  • Biochemical probing
  • Site-directed mutagenesis
  • Structural minimization studies

Main Results:

  • The minimal catalytic core of the QR domain is a 29-nucleotide helix-loop RNA.
  • This minimal core retains the ability to glutamylate ATRib in trans.
  • The amino acid binding site is within an 11-nucleotide cluster adjacent to the ATRib-interacting loop.

Conclusions:

  • A minihelix-loop RNA fragment can function as a trans-aminoacylation catalyst.
  • This finding supports the role of minihelix-loops in the early evolution of aminoacylation systems.
  • The study elucidates the minimal structural requirements for RNA-based amino acid activation and transfer.

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