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Antagonistic substrate binding by a group II intron ribozyme.

P Z Qin1, A M Pyle

  • 1Department of Applied Physics, Columbia University, New York, NY 10032, USA.

Journal of Molecular Biology
|August 10, 1999
PubMed
Summary

Group II intron ribozymes bind substrates with high specificity. Interestingly, substrate binding can involve an energetic penalty due to ribozyme conformational changes, not helix weakening.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA catalysis

Background:

  • Group II intron ribozymes offer precise targeting for nucleic acid sequences.
  • These ribozymes utilize two base-pairing interactions (EBS1-IBS1 and EBS2-IBS2) for substrate recognition.
  • Understanding the thermodynamic basis of this recognition is crucial for their application.

Purpose of the Study:

  • To investigate the thermodynamic properties of substrate-ribozyme recognition in group II introns.
  • To determine the energetic contribution of individual base-pairing interactions to substrate binding.
  • To elucidate the mechanism behind the overall binding energy of the ribozyme-substrate complex.

Main Methods:

  • Thermodynamic analysis of substrate-ribozyme interactions using a group II intron ai5gamma system.
  • Measurement of free energy for individual base-pairing helices (EBS1-IBS1 and EBS2-IBS2).
  • Comparison of individual helix energies with the overall substrate binding energy.

Main Results:

  • Individual helices exhibit base-pairing free energies comparable to standard RNA duplexes.
  • The sum of individual helix energies significantly exceeds the measured binding free energy for the full substrate.
  • A net energetic penalty is observed upon full substrate binding, suggesting antagonistic interactions.

Conclusions:

  • Substrate binding energy in some group II intron ribozymes is not solely derived from additive base-pairing.
  • Ribozyme conformational changes induced by substrate binding contribute to an overall energetic penalty.
  • This mechanism may reconcile high sequence specificity with efficient binding by coupling binding to conformational rearrangement.

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