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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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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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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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Multivalent Cations Reverse the Twist-Stretch Coupling of RNA.

Xiao-Wei Qiang1, Chen Zhang2, Hai-Long Dong1

  • 1Department of Physics and Key Laboratory of Artificial Micro & Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China.

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The twist-stretch coupling of RNA and DNA duplexes depends on how their structures deform under tension. Multivalent cations reverse RNA coupling, revealing a unified mechanism for both nucleic acids.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • DNA and RNA duplexes exhibit twist-stretch coupling, influencing their mechanical properties.
  • The differing twist-stretch coupling mechanisms between DNA (negative) and RNA (positive) remain incompletely understood.

Purpose of the Study:

  • To investigate the influence of multivalent cations on RNA twist-stretch coupling.
  • To propose a unified mechanism explaining the twist-stretch coupling in both DNA and RNA duplexes.

Main Methods:

  • Magnetic tweezers experiments were employed to measure the mechanical response of RNA duplexes.
  • Molecular dynamics simulations were used to elucidate the underlying deformation pathways.

Main Results:

  • Multivalent cations were observed to reverse the twist-stretch coupling of RNA from positive to negative.
  • A unified mechanism involving competing deformation pathways (radius shrinking vs. major groove widening) was proposed.

Conclusions:

  • The study reveals that RNA's major groove clamping by multivalent cations leads to radius shrinking and positive coupling.
  • Elongated DNA and canonical RNA exhibit negative coupling due to major groove widening upon stretching.