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Related Concept Videos

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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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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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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Types of RNA01:20

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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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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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RNA Secondary Structure Prediction Using High-throughput SHAPE
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RNA Secondary Structure Prediction Using High-throughput SHAPE

Published on: May 31, 2013

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Counting Distinguishable RNA Secondary Structures.

Masaru Nakajima1, Andrew D Smith2

  • 1Department of Physics and Astronomy and University of Southern California, Los Angeles, California, USA.

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology
|October 10, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a new algorithm for counting distinct RNA secondary structures in circular sequences. It addresses symmetry issues, offering a cubic-time solution for RNA folding analysis.

Keywords:
RNA secondary structurecounting algorithms

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Area of Science:

  • Computational biology
  • Bioinformatics
  • Molecular biology

Background:

  • RNA secondary structures are crucial for understanding macromolecular folding.
  • Existing dynamic programming algorithms struggle with distinguishability in symmetric RNA sequences, like circular ones.
  • The problem of counting unique secondary structures for symmetric sequences remains a challenge.

Purpose of the Study:

  • To develop an efficient method for counting distinguishable RNA secondary structures in circular sequences.
  • To address the limitations of current algorithms in handling sequence symmetry.
  • To provide a generalizable approach for similar symmetry-related RNA structure problems.

Main Methods:

  • Utilizing elementary group theory to identify relevant subsets of secondary structures.
  • Extending the Hofacker et al. algorithm for calculating subset sizes.
  • Developing a cubic-time algorithm specifically for circular RNA sequences.

Main Results:

  • A cubic-time algorithm capable of counting distinguishable secondary structures for circular sequences.
  • Identification of useful secondary structure subsets through group theory.
  • Demonstration of a generalizable approach for RNA structures with symmetries.

Conclusions:

  • The developed algorithm efficiently counts distinguishable secondary structures in circular RNAs.
  • Group theory provides a powerful framework for analyzing symmetric RNA structures.
  • This method can be extended to solve other RNA folding problems involving symmetry.