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Zero-temperature properties of RNA secondary structures.

Enzo Marinari1, Andrea Pagnani, Federico Ricci-Tersenghi

  • 1Dipartimento di Fisica, SMC and UdR1 of INFM, INFN, Università di Roma "La Sapienza," Piazzale Aldo Moro 2, I-00185 Rome, Italy. Enzo.Marinari@roma1.infn.it

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 15, 2002
PubMed
Summary

This study analyzes microscopic RNA models at zero temperature, revealing a glassy phase in models without ground state degeneracy. Researchers determined scaling exponents and established the existence of this phase with theta approximately 1/3.

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Area of Science:

  • Condensed matter physics
  • Statistical mechanics
  • Biophysics

Background:

  • Microscopic RNA models exhibit complex behavior, including ground state degeneracy.
  • Understanding the low-energy states of these models is crucial for predicting their properties.

Purpose of the Study:

  • To analyze microscopic RNA models at zero temperature.
  • To investigate the impact of ground state degeneracy on model behavior.
  • To establish the existence of a glassy phase in specific RNA models.

Main Methods:

  • Analysis of microscopic RNA models at zero temperature.
  • Calculation of low-energy density of states using a coupling perturbing method.
  • Evaluation of scaling exponents via measurements of overlaps and energy differences.

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Main Results:

  • The simplest RNA model exhibits significant ground state degeneracy.
  • Models with reduced degeneracy were analyzed.
  • A glassy phase with theta approximately 1/3 was clearly established in models lacking accidental ground state degeneracy.

Conclusions:

  • Ground state degeneracy significantly influences the behavior of microscopic RNA models.
  • The identified glassy phase provides new insights into RNA folding and dynamics.
  • Further research into RNA models can elucidate complex biological processes.