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RNA Structure01:23

RNA Structure

Overview
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.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
RNA Structure01:23

RNA Structure

Overview
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.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
RNA Structure01:19

RNA Structure

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.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Nucleic Acid Structure01:25

Nucleic Acid Structure

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.
DNA Structure
DNA has a double-helix structure. The...

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Related Experiment Video

Updated: Jul 6, 2026

Nanomanipulation of Single RNA Molecules by Optical Tweezers
06:59

Nanomanipulation of Single RNA Molecules by Optical Tweezers

Published on: August 20, 2014

Salt-dependent heat capacity changes for RNA duplex formation.

Jennifer C Takach1, Peter J Mikulecky, Andrew L Feig

  • 1Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, USA.

Journal of the American Chemical Society
|May 27, 2004
PubMed
Summary

The heat capacity change (DeltaCP) for RNA duplex formation is sensitive to solution ionic strength, becoming more negative at higher salt concentrations. This contrasts with protein folding, suggesting ion condensation impacts RNA stability.

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Published on: August 20, 2014

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Thermodynamics

Background:

  • Heat capacity change (DeltaCP) is a key thermodynamic parameter in biomolecular interactions.
  • In protein folding, DeltaCP is primarily linked to hydrophobic surface burial and shows weak ionic strength dependence.
  • RNA duplex formation involves electrostatic interactions due to its polyanionic backbone.

Purpose of the Study:

  • To investigate the influence of solution ionic strength on the heat capacity change (DeltaCP) during RNA duplex formation.
  • To compare the ionic strength dependence of DeltaCP in RNA duplex formation with that observed in protein folding.

Main Methods:

  • Isothermal titration calorimetry (ITC) was used to measure duplex formation.
  • Measurements were conducted at varying temperatures to determine DeltaCP.
  • Ionic strength was systematically altered using added NaCl concentrations ranging from 0.1 to 1.5 M.

Main Results:

  • The DeltaCP for RNA duplex formation exhibited a significant dependence on ionic strength for both RNA duplexes studied.
  • This dependence was linear with the logarithm of the added NaCl concentration.
  • DeltaCP values became more negative as ionic strength increased.

Conclusions:

  • The observed ionic strength dependence of DeltaCP in RNA duplex formation is attributed to the polyanionic nature of RNA and associated ion condensation effects.
  • This contrasts with protein folding, where hydrophobic effects dominate DeltaCP.
  • The findings suggest that electrostatic interactions play a crucial role in the thermodynamics of RNA duplex formation and may reveal nearest-neighbor effects.