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Related Concept Videos

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...
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...
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 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...
Nucleic Acids02:43

Nucleic Acids

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.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes, the...
Nucleic acids02:43

Nucleic acids

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.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes, the...

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Related Experiment Videos

Propensities for loop structures of RNA & DNA backbones.

Antonella Paladino1, Ronen Zangi

  • 1Department of Organic Chemistry I, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, 20018 San Sebastian, Spain.

Biophysical Chemistry
|August 13, 2013
PubMed
Summary
This summary is machine-generated.

RNA molecules readily form loop structures due to 2'-hydroxyl groups, unlike DNA. Molecular dynamics simulations reveal RNA's enhanced stability in hairpin loop formation compared to hybrid DNA-RNA chains.

Keywords:
Backbone dihedralHairpin motifMolecular dynamicsReplica-exchange simulationRibose versus deoxyriboseSugar puckering

Related Experiment Videos

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Computational Chemistry

Background:

  • RNA molecules are known for their complex three-dimensional structures, often featuring loop conformations, contrasting with DNA's predominant double-helix structure.
  • The propensity of RNA to form loops is a critical factor in its diverse biological functions.

Purpose of the Study:

  • To investigate the spontaneous hairpin conformation formation in RNA chains with a specific GCUAA pentaloop.
  • To compare the loop-forming stability of RNA with analogous hybrid oligonucleotides where ribose sugars in the loop are replaced by deoxyriboses.

Main Methods:

  • Molecular dynamics (MD) simulations.
  • Replica-exchange molecular dynamics (REMD) method.
  • Comparative analysis of hydrogen bonding and backbone dihedral angles between RNA and hybrid chains.

Main Results:

  • RNA oligomers show marginal excess stability in forming loop structures compared to hybrid chains.
  • The equilibrium constant for loop opening is twice as large in hybrid chains, indicating greater stability of RNA loops.
  • The enhanced stability of RNA hairpin loops is attributed to hydrogen bonds formed by 2 -hydroxyl groups within the loop, particularly involving the first and fourth nucleotides.

Conclusions:

  • The 2 -hydroxyl groups in RNA loops play a crucial role in stabilizing hairpin conformations through specific hydrogen bonding interactions.
  • The conformational flexibility of the RNA backbone, specifically the δ-dihedral, facilitates these stabilizing hydrogen bonds, leading to increased loop stability.
  • These findings highlight the structural contributions of 2 -hydroxyl groups to RNA's unique three-dimensional architecture and function.