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RNA Structure01:23

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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.
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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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Updated: Aug 1, 2025

Probing RNA Structure with Dimethyl Sulfate Mutational Profiling with Sequencing In Vitro and in Cells
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Led-Seq: ligation-enhanced double-end sequence-based structure analysis of RNA.

Tim Kolberg1, Sarah von Löhneysen2, Iuliia Ozerova2

  • 1Institute for Biochemistry, Leipzig University, Brüderstr. 34, 04103 Leipzig, Germany.

Nucleic Acids Research
|April 28, 2023
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This summary is machine-generated.

Led-Seq is a novel method for RNA structural analysis that uses lead-induced cleavage. This approach investigates both RNA cleavage products, improving accuracy for in vivo RNA structure determination.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNA structural analysis is crucial for understanding cellular and in vitro functions.
  • Existing methods like chemical modification or cleavage reactions have limitations in capturing complete structural information.

Purpose of the Study:

  • To introduce Led-Seq, a new approach for RNA structural analysis.
  • To overcome limitations of existing methods by analyzing both RNA cleavage products.

Main Methods:

  • Led-Seq utilizes lead-induced cleavage at unpaired RNA positions.
  • Specific RNA ligases attach oligonucleotide adapters to 2', 3'-cyclic phosphate or 5'-OH RNA ends.
  • Deep sequencing identifies cleavage sites by ligation positions, avoiding false positives from premature reverse transcription stops.

Main Results:

  • Led-Seq provides a comprehensive analysis by investigating both RNA cleavage fragments.
  • The method effectively identifies cleavage sites, mitigating issues with premature reverse transcription stops.
  • Validation in Escherichia coli demonstrates Led-Seq's reliability for in vivo RNA structure investigation.

Conclusions:

  • Led-Seq is an improved and reliable method for in vivo RNA structural analysis.
  • The approach leverages metal ion-induced phosphodiester hydrolysis for accurate structural insights.
  • This technique enhances the understanding of RNA structure-function relationships.