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Related Concept Videos

RNA-seq03:21

RNA-seq

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Related Experiment Video

Updated: May 28, 2025

Probing RNA Structure with Dimethyl Sulfate Mutational Profiling with Sequencing In Vitro and in Cells
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Selective deuteration of an RNA:RNA complex for structural analysis using small-angle scattering.

Aldrex Munsayac1, Wellington C Leite2, Jesse B Hopkins3

  • 1Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.

Structure (London, England : 1993)
|February 11, 2025
PubMed
Summary

This study introduces a novel scattering method to analyze RNA:RNA complex structures. The technique combines in silico modeling with X-ray and neutron scattering to reveal conformational changes in RNA assemblies.

Keywords:
HIV-1 dimerization initiation siteRNA structureRNA structure modelingRNA:RNA complexintegrative structural biologyisotope labelingsmall-angle X-ray scatteringsmall-angle neutron scattering

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Area of Science:

  • Structural Biology
  • Biophysics
  • Molecular Biology

Background:

  • Protein-free RNA:RNA complexes are crucial for biological regulation but are structurally underrepresented.
  • Understanding the dynamics of RNA:RNA interactions is essential for deciphering their functional roles.

Purpose of the Study:

  • To develop and demonstrate a combined scattering approach for interrogating RNA:RNA complex structures.
  • To validate and refine computational models of RNA:RNA complexes using experimental data.

Main Methods:

  • Utilized joint small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS).
  • Employed isotope labeling and contrast matching (CM) with SANS for selective probing of RNA components.
  • Integrated experimental data with in silico modeling, including AlphaFold 3 predictions.

Main Results:

  • SAXS provided solution structures of individual RNAs and their complex.
  • CM-SANS successfully probed the bound state structure of a selectively deuterated RNA within a complex.
  • Experimental data validated and improved AlphaFold 3 RNA:RNA complex structure predictions.

Conclusions:

  • The integrated approach of in silico modeling, SAXS, and CM-SANS enables direct analysis of RNA conformational changes in complexes.
  • This methodology enhances the understanding of RNA structure within functional assemblies.
  • The study provides a powerful tool for investigating RNA structure-function relationships.