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Visualizing Disordered Single-Stranded RNA: Connecting Sequence, Structure, and Electrostatics.

Alex Plumridge1, Kurt Andresen2, Lois Pollack1

  • 1School of Applied and Engineering Physics , Cornell University , Ithaca , New York 14853 , United States.

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Summary
This summary is machine-generated.

Single-stranded RNA homopolymers like U and A tracts exhibit distinct structures and ion atmospheres. These sequence-dependent properties influence RNA folding and protein interactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Homopolymeric regions (e.g., U or A tracts) in functional single-stranded RNA (ssRNA) are crucial for molecular structure and partner recognition.
  • The precise conformational and biophysical properties of these ssRNA motifs remain incompletely understood.

Purpose of the Study:

  • To investigate the conformations and ion atmospheres of biologically significant ssRNA homopolymers.
  • To provide quantitative measurements of the biophysical characteristics of U and A tracts in ssRNA.

Main Methods:

  • Application of multiple experimental techniques to probe ssRNA structure.
  • Quantitative measurement of ion atmospheres surrounding ssRNA homopolymers.

Main Results:

  • ssRNA conformations are sequence-dependent, attracting unique ion atmospheres.
  • Poly U (rU) chains are generally unstructured, while poly A (rA) chains exhibit ordering via stacking or clustering, influenced by solution conditions.
  • Observed structural differences correlate with measured disparities in ion composition and atmospheres.

Conclusions:

  • A complex interplay exists between RNA bases, ions, and ssRNA ordering.
  • The distinct structural and ionic signatures of ssRNA homopolymers explain their roles in RNA folding and protein recognition.