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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The structural diversity of nucleic acids is crucial for understanding biological function.
  • TERRA (Telomeric Repeat-containing RNA) plays roles in telomere maintenance, but its structural properties remain incompletely understood.
  • Higher-order RNA structures offer novel functionalities beyond canonical duplexes.

Purpose of the Study:

  • To investigate the potential for higher-order structures formed by the TERRA sequence.
  • To characterize the structural and biophysical properties of any novel RNA structures identified.
  • To explore the utility of these structures in biosensing and diagnostic applications.

Main Methods:

  • Circular Dichroism (CD) spectroscopy to determine secondary and tertiary structure.
  • Nuclear Magnetic Resonance (NMR) analysis for atomic-level structural elucidation.
  • Molecular modeling to predict and refine the RNA structure.
  • Binding assays with small molecules (Thioflavin T, N-methyl mesoporphyrin IX) and hemin.
  • CRISPR-Cas13a trans-cleavage assays to assess RNA recognition and processing.

Main Results:

  • Discovery and characterization of a novel RNA G-triplex (rG3) structure formed by the TERRA sequence.
  • Confirmation of a stable, parallel conformation for the rG3 structure using spectroscopic and modeling techniques.
  • Demonstration of strong binding of rG3 to Thioflavin T, N-methyl mesoporphyrin IX, and hemin.
  • Evidence of specific cleavage of rG3 by CRISPR-Cas13a, indicating its potential as a reporter molecule.

Conclusions:

  • The identification of RNA G-triplex (rG3) expands the known repertoire of RNA higher-order structures.
  • The unique binding properties and susceptibility to CRISPR-Cas13a cleavage position rG3 as a promising candidate for novel biosensing and diagnostic platforms.
  • This work opens new avenues for exploring RNA structure-function relationships and developing RNA-based technologies.