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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 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 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 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...

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Structural and Thermodynamic Properties of RNA Molecules Using a Knowledge-Based Model.

Mario Villada-Balbuena1,2, Mauricio D Carbajal-Tinoco1

  • 1Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, Av. Instituto Politécnico Nacional No. 2508, Col. San Pedro Zacatenco, CP 07360 Ciudad de México, Mexico.

Journal of Chemical Theory and Computation
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This study introduces a coarse-grained model for ribonucleic acid (RNA) unfolding, accurately predicting thermodynamic properties and mechanical unfolding using Brownian dynamics simulations. The model shows excellent agreement with experimental data for RNA hairpins and pseudoknots.

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Area of Science:

  • Computational Biology
  • Biophysics
  • Molecular Modeling

Background:

  • Understanding ribonucleic acid (RNA) molecule thermodynamics and unfolding is crucial for molecular biology and drug development.
  • Existing models often require extensive parameters or lack accuracy in predicting mechanical properties.

Purpose of the Study:

  • To develop and validate a coarse-grained model for simulating RNA unfolding and thermodynamics.
  • To accurately predict key thermodynamic parameters such as Helmholtz and Gibbs free energy changes.
  • To provide a computationally efficient tool for studying RNA behavior.

Main Methods:

  • Developed a coarse-grained model representing RNA nucleotides as single interacting points.
  • Utilized Brownian dynamics simulations with iterative Boltzmann inversion for potential optimization.
  • Employed steered Brownian dynamics to simulate mechanical unfolding of RNA structures.
  • Applied Jarzynski's equality to calculate free energy changes from simulation data.

Main Results:

  • Calculated characteristic RNA chain properties including bond distribution, contour length, radius of gyration, and persistence length.
  • Optimized effective interaction potentials, reducing fitting parameters and improving radial-angular interaction description.
  • Achieved excellent agreement between simulated mechanical unfolding and experimental data for hairpins and pseudoknots.
  • Successfully predicted Helmholtz and Gibbs free energy changes, consistent with optical tweezer experiments.

Conclusions:

  • The developed coarse-grained model accurately describes RNA unfolding thermodynamics and mechanical properties.
  • The model serves as a valuable tool for investigating RNA behavior, including viral protein expression-associated molecules.
  • The findings offer insights into RNA structural dynamics and stability relevant to various biological processes.