Related Experiment Video
Updated: Jun 20, 2026
05:37
Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
Published on: April 4, 2025
A comparison of DNA and RNA quadruplex structures and stabilities
Astrid Joachimi1, Armin Benz, Jörg S Hartig
1Department of Chemistry and Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstr. 10, 78457 Konstanz, Germany.
Bioorganic & Medicinal Chemistry
|September 9, 2009
Summary
RNA can form stable four-stranded quadruplex structures, similar to DNA. These RNA quadruplexes exhibit unique all-parallel conformations and comparable or enhanced thermal stabilities, potentially impacting gene regulation.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Guanosine-rich sequences can form four-stranded nucleic acid structures known as quadruplexes.
- While DNA quadruplexes are well-studied for regulatory roles, RNA quadruplexes remain less explored.
- RNA is known to possess the capability to form stable quadruplex structures.
Purpose of the Study:
- To compare the structures and stabilities of RNA quadruplexes with their DNA counterparts.
- To investigate the conformational diversity and thermodynamic properties of RNA quadruplexes.
- To assess the potential biological implications of RNA quadruplex formation.
Main Methods:
- Circular Dichroism (CD) spectroscopy was employed to analyze quadruplex structures.
- CD thermal melting experiments were conducted to determine the stability of quadruplexes.
- Comparison of established DNA quadruplex sequences with their corresponding RNA sequences.
Main Results:
- RNA sequences exclusively adopted an all-parallel quadruplex conformation.
- DNA quadruplexes displayed a diversity of topologies, unlike RNA.
- RNA quadruplexes showed thermal stabilities comparable to or exceeding those of DNA.
- Potassium ions significantly enhanced the stability of thermodynamically less stable RNA quadruplexes compared to DNA.
Conclusions:
- RNA quadruplexes possess distinct structural and stability characteristics compared to DNA.
- The enhanced stability of RNA quadruplexes, particularly in the presence of potassium, suggests a significant role in biological regulation.
- Formation of quadruplexes in messenger RNAs (mRNAs) may have a greater impact on gene expression than previously understood.
Related Concept Videos
01:53RNA 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...
01:53RNA 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...
01:23RNA 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...
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...
01:19RNA 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...
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...
01:23RNA 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...
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...
01:25Nucleic 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...
DNA Structure
DNA has a double-helix structure. The...