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Nucleic Acid Structure01:25

Nucleic Acid Structure

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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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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...
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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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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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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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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Focus on PNA Flexibility and RNA Binding using Molecular Dynamics and Metadynamics.

Massimiliano Donato Verona1, Vincenzo Verdolino2,3, Ferruccio Palazzesi2,3

  • 1Dipartimento di Chimica, University of Parma, Italy, 43124, Italy.

Scientific Reports
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Peptide Nucleic Acids (PNAs) undergo conformational changes affecting their DNA/RNA binding. Backbone modifications, like γ-functionalization, influence PNA preorganization and targeting, crucial for gene regulation applications.

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Area of Science:

  • Biochemistry
  • Computational Biology
  • Molecular Genetics

Background:

  • Peptide Nucleic Acids (PNAs) are versatile tools for gene regulation, targeting DNA and RNA.
  • Modifications to the PNA backbone enhance sequence affinity and selectivity.
  • A complete understanding of PNA-nucleic acid binding mechanisms is essential for rational PNA design.

Purpose of the Study:

  • To computationally investigate PNA conformations and their correlation with DNA/RNA binding.
  • To explore the impact of backbone modifications on PNA preorganization and targeting capabilities.

Main Methods:

  • Metadynamics simulations to reveal conformational pre-organizations of single-strand PNAs.
  • Classical molecular dynamics (MD) simulations to study PNA:RNA dissociation and association.
  • Comparison of simulation data with experimental circular dichroism (CD) spectra.

Main Results:

  • Metadynamics identified PNA conformational pre-organizations not observed with classical MD.
  • γ-functionalization of PNA backbones significantly affects single-strand preorganization and DNA/RNA targeting.
  • MD simulations highlighted the critical role of central bases and preorganization in PNA binding.

Conclusions:

  • Computational methods provide valuable insights into PNA conformational dynamics and binding mechanisms.
  • Backbone modifications offer a route to tune PNA properties for enhanced gene regulation.
  • Further understanding of PNA-nucleic acid interactions will advance their application in molecular biology.