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Related Concept Videos

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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Related Experiment Video

Updated: Jan 7, 2026

Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism
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Analyzing Structural Heterogeneity in RNA Using Fluorescence-Detected Circular Dichroism Spectroscopy.

Julia R Widom1,2, Taylor L Coulson3

  • 1Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR, USA. jwidom@uoregon.edu.

Methods in Molecular Biology (Clifton, N.J.)
|January 1, 2026
PubMed
Summary
This summary is machine-generated.

This study details fluorescence-detected circular dichroism (FDCD) spectroscopy for analyzing RNA structure. FDCD offers specific insights into fluorescent molecules within complex biological systems.

Keywords:
Circular dichroismFluorescenceFluorescent base analoguesRNA structureSpectroscopy

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Area of Science:

  • Biophysical Chemistry
  • Molecular Biology
  • Spectroscopy

Background:

  • Circular dichroism (CD) spectroscopy is a key technique for studying biological macromolecule conformations.
  • Fluorescence-detected CD (FDCD) spectroscopy enhances structural analysis by targeting specific fluorescent species in heterogeneous systems.

Purpose of the Study:

  • To provide a detailed protocol for measuring FDCD spectra, specifically addressing RNA.
  • To outline procedures for processing and analyzing FDCD data applicable to any instrument.
  • To offer guidelines for interpreting FDCD data qualitatively and quantitatively.

Main Methods:

  • Utilized the Jasco J-1500 CD spectrophotometer for FDCD measurements.
  • Developed specific experimental considerations for RNA samples.
  • Established data processing and analysis workflows for FDCD spectra.

Main Results:

  • Demonstrated a protocol for acquiring FDCD spectra of RNA.
  • Provided a qualitative interpretation rule: larger FDCD signals indicate brighter species with strong CD signals.
  • Outlined quantitative methods using FDCD, CD, and fluorescence quantum yield to determine structural prevalence and resolve subpopulations.

Conclusions:

  • FDCD spectroscopy is a powerful tool for structural characterization of fluorescent biomolecules, particularly RNA.
  • The presented protocol and analysis methods facilitate broader adoption of FDCD in structural biology.
  • FDCD, combined with other spectroscopic data, enables detailed conformational analysis of complex biological systems.