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Related Concept Videos

RNA Structure01:19

RNA Structure

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. 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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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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Related Experiment Video

Updated: Mar 29, 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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Poly(ADP-ribose) (PAR) exhibits ion-dependent structural properties distinct from RNA.

Lipika Baidya1, Heyang Zhang1, Hung T Nguyen1

  • 1Department of Chemistry, The State University of New York, Buffalo 14260, NY, United States.

Nucleic Acids Research
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Poly(ADP-ribose) (PAR), crucial for DNA repair, undergoes significant structural changes with ions, unlike RNA. This study models PAR dynamics, revealing distinct ion interactions that drive its function in cellular processes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Poly(ADP-ribose) (PAR) is a nucleic-acid-like polymer vital for DNA repair and chromatin remodeling.
  • PAR's role in biomolecular phase separation is significant but mechanistically unclear due to its complex structure.
  • Limited experimental data exists on PAR's conformational dynamics and ion interactions.

Purpose of the Study:

  • To develop a coarse-grained model for Poly(ADP-ribose) (PAR).
  • To compare PAR's conformational ensemble and ion atmosphere with RNA using molecular dynamics simulations.
  • To elucidate the molecular mechanisms behind PAR's role in phase separation and protein organization.

Main Methods:

  • Development of a five-bead coarse-grained model for PAR.
  • Conducting molecular dynamics simulations.
  • Analyzing conformational ensembles and ion atmospheres in various ionic conditions.

Main Results:

  • PAR exhibits a stronger structural transition than RNA in response to divalent ions.
  • Preferential ion binding and ion-mediated bridging drive PAR's conformational changes.
  • PAR forms a compact, ion-rich atmosphere distinct from RNA, facilitating phase separation.

Conclusions:

  • A physically grounded model for PAR dynamics has been established.
  • Key molecular differences between PAR and RNA in ion environments were identified.
  • Mechanistic insights into PAR's role in phase separation and protein interactions at DNA damage sites were provided.